TEAS Science Q/BANK 2022, Answered/Elaborated.

Document Content and Description Below

TEAS Science Q/BANK 2022 Which of the following illustrates a negative feedback mechanism that occurs in the human body? a)the release of insulin from the pancreas in response to an increase in... blood sugar levels b) the release of glucagon from the pancreas in response to an increase in blood- sugar levels c) the release of oxytocin resulting in uterine contractions as childbirth is underway d) chemical reactions that result in coagulation due to fibrin being released Pancreatic cells have an abundance of _______ to meet the protein production demands of the cell a) nuclei b)mitochondria c)lysosomes d) rough endoplasmic reticulum Nails are made of a protein called ____ a) collagen b)vinculin c)keratin d) elastin Anxiety about an upcoming final exam causes a student to experience an increase in blood pressure, dilation of the pupils, and a dry mouth. Which of the following nervous system responses is responsible for these physical symptoms? A. Voluntary B. Sympathetic C. Limbic D. Cognitive Which of the following results from the release of the neurotransmitter dopamine into the nerve synapse? a) the presynaptic neuron fires an action potential b) Dopamine binds to receptor proteins on the membrane of the postsynaptic cell c)Dopamine enters the cytoplasm of the postsynaptic cell d) dopamine cause the postsynaptic nerve cell to contract Which of the following describes the function of the ribosome in a living cell? a) production of ATP molecules from energy in nutrient molecules b) Disposal and recycling of damaged or unneeded cell parts c) Use of genetic information to build specific protein molecules d) regulation of molecules entering and leaving the cell if an intensive property in independent of the amount of the material being measured, which of the following is an example of intensive property? a)Length b)mass c)volume d) density ANS Which of the following statements correctly matches a body system with its function? a) the digestive system facilitates absorption of substances into the bloodstream b) the respiratory system transports oxygenated blood throughout the lungs and body c) The excitatory system prevents harmful substances from entering the body d) The endocrine system transports hormones from place to place within the body which of the following is "x" in the reaction above? a) 239 Pu 94 b) 231 Pu 94 c) 231 Th 90 ANS What is the role of the urethra? a) to transport urine out of the body b) to transport the egg to the uterus c) to connect the kidneys to the bladder d) to connect the uterus to the outside of the body ANS Which of the following is the form of energy contained in nutrient molecules and in ATP's high-energy bonds? a) mechanical energy b)potential energy c)kinetic energy d)radiation energy A researcher decides to repeat an experiment and reassess results first established in the 1930's about why plants grow toward light. Which of the following is the best reason for conduction this experiment? a)plant behavior could have modified due to evolutionary processes since the experiments were first done b)new breeds of plants discovered since the 1930's have not yet been shown to have to same light responses c)shifts in average temperatures produced by global warming may affect plants in ways that are not yet understood d)equipment and methods developed since the 1930's may produce better data and provide mechanistic detail. Which of the following glands produces melatonin, the hormones that regulates sleep? a) thyroid b)hypothalamus c)pituitary d) pineal Which of the following explains why damage to the spleen reduces the production of granulocytes? a)damage to the spleen reduces the production of granulocytes b) damage to the spleen causes massive blood loss c) damage to the spleen results in loss of clotting ability d) damage to the spleen results in decreased red blood cell production and maturation When an enzyme is degraded into its monomeric structural units, the monomers will be a)monosaccharides b)fatty acids c)nucleotides d)amino acids Which of the following enzymes breaks down complex carbohydrates? a) amylase b) pepsin c)lactase d)lipase Which of the following is the purpose of using a control groups in an investigation? a) to establish a standard for data comparison b)to provide the correct answer to an investigation c) to determine the dependent variables d) to function as a third variable group Which of the following contains the testes? a) epididymis b) Mesentery b)prostate d) scrotum Which of the following glands is exclusively found in males? a) adrenal b)parathyroid c)Cowper's d) pituitary Which of the following conditions is related to an abnormality in the function of red blood cells? a) arrhythmia b) Anemia c) hypertension d) leukemia Which of the following processes explains why an individual that has suffered a broken bone and is immobilized for an extended period of time experiences bone mass loss? a) demineralization b)muscle atrophy c) ossification d) kyphosis a blood sample taken from a patient fighting an infection is expected to show a) reduced white blood cell count b)elevated white blood cell count c) elevated red blood cell count d)reduced red blood cell count Which of the following is part of the small intestine? a) ileum b) colon c) Pylorus d) Cecum Which of the following hormones is produced in the ovaries? a) estrogen b) vasopressin c) prolactin d) oxytocine Which pf the following explains why gases are termed "compressible" and liquids are not? a) particles have fixed volume and are able to occupy the contained in which they are contained b) particles do not have much empty space between them, thus making them rigid c) particles have a large amount of empty space between them d) particles are held closely together by intermolecular forces which of the following glands is found on top of the kidneys? a) thyroid b) pituitary c) adrenal d) pancreas which of the following explains what happens to the circulatory system during hyperventilation? a) oxygen levels increase, causing an increase in blood pH b) Oxygen levels decrease, causing a decrease in blood pH c) Carbon dioxide levels decrease, causing an increase in blood pH d) Carbon dioxide levels increase, causing a decrease in blood pH Balance the equation above. Which of the following describes the number of moles of each product that are formed by this chemical reaction after is has been balanced? a) one mole magnesium chloride, one mole water b) one mole magnesium chloride, two moles water c) two moles magnesium chloride, one mole water d) two moles magnesium chloride, two moles water Which of the following molecules, if present in urine, indicates a problem with kidney function? a) Albumin b) Creatinine c) Sodium Ions d) water A blood pressure reading of 120/70 mm HG refers to arterial pressures recorded during a) atrial contraction/ventricular contraction b) atrial contraction/ ventricular relaxation c) Ventricular contraction/ Ventricular relaxation d) Ventricular relaxation/ atrial relaxation Which of the following organs stores bile? a) stomach b)liver c)small intestine d) Gallbladder Skeletal muscle contraction is stimulated by the neurotransmitter ______, which is released by nerves at the neuromuscular junction a) acetylcholine b)nitric oxide c) dopamine d) glycine Which of the following layers of the epidermis contains cells that provide protection against UV radiation? a) stratum corneum b) stratum lucidum c) stratum spinosum d) stratum basale Using the food chain above, which of the following terms best describes the trophic level of snails? A. Producer B. Primary consumer C. Secondary consumer D. Tertiary consumer The lungs are covered by a membrane called the a) pericardium b) periosteum c) symphysis d) pleura ANS It has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion? a) microscopically, chloroplasts appear similar to cyanobacteria b) chloroplast DNA shows clear similarities to cyanobacteria DNA c) Both chloroplasts and cyanobacteria are green and perform photosynthesis d) Photosynthesis cyanobacteria and fungi form a mutualistic association in lichen A student made a culture of yeast cells in a test tube by mixing a pinch of dry yeast with 10 milliliters (mL) of distilled water. This test tube was labeled A. The student then took 1 mL of the resulting solution and placed it in test tube B and with 9 mL of distilled water. The student continued using this method of serial dilution through trial E as shown in the figure above. Examining the solution in test tube E under a microscope, the student found that there were 1,500 yeast cells per milliliter. Which of the following is the concentration of yeast cells per milliliter in test tube c. a) 15 b) 150 c)15,000 d) 150,000 The cause of cell differentiation is that different cells a) contain different DNA b) have different chromosomes c) contain similar protein information d) express alternate genetic information Which of the following cell types produce antibodies? a) t- cells b) dendritic cells c) b- cells d) natural killer cells Cystic Firbrosis is a homozygous recessive condition. A genetic counselor should advise concerned parents that, if each of them has a parent who has cystic fibrosis yet neither of the concerned parents is affected, the probability of their potential child having cystic fibrosis is a) 0% b) 25 % c) 50% d) 100% 1. preservation of genes of best - adapted offspring 2. Overproduction of offspring with variation in traits 3. Differential survival in the face of environmental challenges Which of the following is the sequence in which these steps take place? a) 3,2,1 b) 1,3,2 c) 2,1,3 d) 2,3,1 Which of these terms specifically means the intake and expulsion of air using the lungs? a) inspiration b) aeration c) Ventilation d) Oxygenation Which of the following is the iron- containing protein in red blood cells ? a)plasma b) deoxyribonucleic acid c) hemoglobin d) myoglobin Which of the following connects bones to muscles? a)ligaments b) tendons c) synovium d) suture A first degree burn involves which of the following layers of skin? a) epidermis only b) epidermis and part of the dermis c) epidermis and all of the dermis d) epidermis, dermis, and some muscle and bone Which of the following food sources provides the majority of the urea that is filtered from the blood via the kidneys? a) meat and some plant products, such as legumes b) fruits, such as pineapple and pear c) lard and various oils, such as vegetables and canola d) grain products, such as breads and pasta Which of the following correctly lists the cellular hierarchy from the simplest to the most complex structure? a.cell, tissue, organ, organ system, organism b.tissue, cell, organ, organ system, organism c.organism, organ system, organ, tissue, cell d. organ system, organism, organ, tissue, cell If a cell is placed in a hypertonic solution, what will happen to the cell? a.It does not affect the cell. b.It will stay the same. c. It will shrink. d. It will swell. What are groups of cells that perform the same function called? a. molecules b. organs c. plastids d. tissues When does the nuclear division of somatic cells take place during cellular reproduction? a. cytokinesis b. mitosis c. interphase d.meiosis Which group of major parts and organs make up the immune system? a. brain, spinal cord, and nerve cells b. lymphatic system, spleen, tonsils, thymus, and bone marrow c. nose, trachea, bronchial tubes, lungs, alveolus, and diaphragm d. heart, veins, arteries, and capillaries The rate of a chemical reaction depends on all of the following except a. surface area. b. temperature. c. presence of catalysts. d. amount of mass lost. Which of the answer choices provided best defines the following statement? For a given mass and constant temperature, an inverse relationship exists between the volume and pressure of a gas? a. Charles' Law b. Boyle's Law c. Stefan-Boltzmann Law d. Ideal Gas Law Prokaryotic and eukaryotic cells are similar in having which of the following? a. Presence of a nucleus. b. Membrane-bound organelles c. Protein-studded DNA d. Integral membrane proteins in the plasma membrane What is the role of ribosomes? a. storage b. waste removal c. make proteins d. transport Which of the following is an example of a tissue? a. mammal b. hamstring c. liver d. xylem The adrenal glands are part of the a. endocrine system. b. respiratory system. c. immune system. d. emphatic system. Which of the following is exchanged between two or more atoms that undergo ionic bonding? a. transitory electrons b .neutrons c. electrical charges d .valence electrons What is the longest phase of the cell cycle? a. mitosis b. cytokinesis c. interphase d. metaphase An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number? A It cannot be determined. B 19 C 45 D 64 The spleen functions are part of the _____ system. Which of the following completes the sentence above? A digestive B lymphatic C endocrine D circulatory Which of the following is an example of deductive reasoning? A Only 21% of a town's population have expressed a desire to ban all cars. Therefore, the new proposition banning cars in the state is not likely to pass. B People who brush their teeth regularly have fewer instances of heart disease. Therefore, good dentistry can prevent heart attacks. C All soccer players who play professionally can kick well. Therefore, any future soccer player who is recruited to play professionally will be able to kick well. D All secretaries are good typists. Cynthia is a secretary. Therefore, Cynthia is a good typist. Which of the following is a possible cause of herniation of discs? A hepatitis B whiplash C plantar fasciitis D ulcer Which of the following is a characteristic of the autonomic nervous system? A. It regulates the voluntary control of body movements through the skeletal muscles. B It is the part of the nervous system consisting of the brain and spinal cord. C It regulates involuntary activity in the heart, stomach, lungs, and intestines. D It is thought to be the center of intelligence. During photosynthesis, which two compounds are combined to create the output of glucose and oxygen? A Carbon dioxide and water. B Carbon dioxide and bicarbonate. C Bicarbonate and water. D Carbon dioxide and multiple alkaline substances. What type of bond between the complementary bases of DNA stabilizes the double helix structure? A covalent B ionic C hydrogen D nuclear Which of the following subatomic particles are found inside of an atom's nucleus? A electrons, neutrons, protons B neutrons, protons C electrons, protons D electrons Which of the following statements is true regarding trophic levels? A Tertiary consumers acquire more energy content than secondary consumers. B Producers acquire less energy than primary consumers. C Secondary consumers acquire more energy than primary consumers. D Tertiary consumers acquire less energy than primary consumers. Why does the human eye perceive a red colored dress as the color red? A The molecules of the dress do not absorb red light wavelengths. B The molecules of the dress absorb green and blue light wavelengths. C A red dress will primarily absorb red light wavelengths. D A red dress will not absorb light wavelengths from non-red colors. In a lab experiment designed to test the rate at which plants grow under artificial light, the kind of light used is which type of variable? A dependent B independent C random D responding Which organ system is primarily responsible for regulating metabolism, mood, and growth? A respiratory system B digestive system C endocrine system D lymphatic system In a vacuum, why doesn't an elephant accelerate faster than a penny as it falls to the ground? A Vector components of an elephant are more complex than those of a penny. B An elephant is not a projectile, while a penny is. C They both have an acceleration of 9.8 m/s2. D The elephant is greater in mass but is slowed less by the effects of air resistance. Which train described below would have the greatest momentum? A A 9500 kg train car moving at 200 mph B An 8000 kg train car moving at 215 mph C A 9300 kg train car moving at 190 mph D A 8600 kg train car mobbing at 195 mph A scientist found that when an invasive species was introduced into a river, the population of salmon native to the region decreased. The type of correlation between these two populations could best be described as A a direct relationship. B an inverse relationship. C a direct and indirect relationship. D no decisive relationship. The addition of a catalyst to a chemical reaction will have what effect? A Increase the energy required for the reaction to take place. B Increase the time required for the reaction to take place. C Increase the rate at which the reaction takes place. D Reduce the amount of products in the reaction. The pharynx is part of what body system? A respiratory B muscular C lymphatic D circulatory Which of the following is true about eukaryotic cells? A They do not contain lysosomes. B They contain one chromosome. C They do not contain a nucleus. D They contain mitochondria. What characteristic of an element determines its specific isotope? A Number of protons. B Number of neutrons. C Number of electrons. D Number of quarks. What is NOT true about RNA? A It contains a sugar called ribose. B Thymine is not one of its base pairings. C It is unstable in alkaline conditions. D Its sugar is more reduced than DNA's sugar. Which of the following scenarios would NOT give a normal distribution? A distribution of the yearly income of families in the U.S. B The distribution of heights in a large sample of people. C The percentage of toxic wastes and pollution in the atmosphere vs. the lifespan of organisms in the location. D A curve with 97% of the population within the first two standard deviations. In a cell, the Golgi apparatus is found in what location? A Inside the nucleus B Inside the mitochondria C In the cell wall D In the cytoplasm Which taxonomic rank is the next-smallest after Order? A Phylum B Family C Species D Genus In plants, ________ involves the formation of a _____? A cytokinesis, cleavage furrow B telophase, cell plate C cytokinesis, cell plate D prophase, DNA Which base is NOT found in DNA? A guanine B cytosine C uracil D adenine Which of the following layers of the atmosphere is the closest to space? A troposphere B stratosphere C mesosphere D thermosphere Which is NOT one of the four basic types of tissue? A parenchyma B epithelial C nervous D connective The stomach is _____ to the small intestine. Which of the following correctly completes the sentence above? A lateral B superior C posterior D proximal Which of the following is the atomic mass of an atom containing 42 protons, 42 electrons, and 37 neutrons? A 42 B 79 C 84 D 121 A patient who has suffered head trauma is not able to recognize people he has met around an hour earlier but is still able to recognize people he met before the injury. He most likely has damage to the: A Medulla Oblongata B Corpus Callosum C Hippocampus D Pituitary Gland ________ is a two-step process, and the four cells that result each have half the normal genetic material of the original cell. a. meiosis b. mitosis c.replication d. codification Of the following, which is not a type of chemical bond? A ionic B covalent C polar D magnetic If the amount of hydrogen in a balloon of fixed size is doubled, what happens to the mass and density of the balloon? A The mass and density both decrease. B The mass increases, but the density decreases. C The mass decreases, but the density increases. D The mass and density both increase. If you have 200 mL of a 60% sodium chloride solution, how much NaCl is dissolved in the solution? A . 20 g B 50 g C 80 g D 120 g How many carbon dioxide molecules are required to balance the following reaction: 4C6H12O6 + 24O2 → _CO2 + 24H2O + Energy A . 4 B 8 C 16 D 24 A scientist wants to write an equation using the variables X, Y, and Z. What is the proper relationship between the variables if X represents time, Y represents energy, and Z represents power? A 2XY = Z B XZ = 2Y C Z = X/Y D Z = Y/X What type of cells result from mitosis? A one diploid cell B two haploid cells C two diploid cells D four haploid cells Cheetahs, rainbow trout, and inchworms belong to the same A Kingdom B Phylum C Class D Order The presence of which hormone would NOT cause an increase in water retention? A Renin B ANP C ADH D Aldosterone In which part of the heart does oxygenated blood flow out of? A Right ventricle B Left ventricle C Right atrium D Left atrium Which of the following hormones are secreted directly by the hypothalamus? A . melatonin B oxytocin C dopamine D calcitonin Which vitamin is synthesized within the human body? vitamin A vitamin E vitamin C vitamin D rypsinogen, an enzyme secreted by the pancreas, is activated into trypsin in the duodenum by which enzyme? pepsin enterokinase hydrochloric acid protease Follicle-stimulating hormone (FSH), which is responsible for maturation of follicles in the ovary, is produced by which gland in the body? ovary corpus luteum posterior lobe of pituitary gland anterior lobe of pituitary gland In a chemical reaction: sulfuric acid + substance X = salt + water + carbon dioxide. What could substance X be? magnesium hydroxide copper(II) oxide sodium carbonate potassium A ball is tied to a pole with a rope and is moving in a circle with constant speed. Which of these statements about the ball is true? Force is acting away from the center of circle. Force is acting at a tangent to the circle. There is force acting toward the center of circle. There is no acceleration. Which of these make up a molecule of fat? three molecules of fatty acid and one molecule of glycerol one carbon, one hydrogen, and one oxygen molecule one glycerol molecule and three stearic acid molecules three molecules of glycerol and one molecule of fatty acid Enzymes are ____ that work best at ____ pH or temperature. biological catalysts, optimum chemical substances, moderate organic catalysts, minimum inorganic catalysts, maximun Which of these statements regarding the process of fermentation is true? It is an example of an anaerobic process where yeast acts on a sugar solution to produce carbon dioxide and alcohol. It is an example of an anaerobic process where bacteria act on a protein solution to produce carbon dioxide and alcohol. It is an example of tissue respiration where yeast acts on carbohydrates to produce oxygen and alcohol. It is an example of an aerobic process where yeast acts on a sugar solution to produce oxygen and alcohol. Which of these statements regarding the "oxygen debt" created during heavy exercise is true? Oxygen debt is created due to build-up of acetic acid in the muscles, which needs a high level of oxygen to be oxidized. Oxygen debt is created due to build-up of lactic acid in the liver, which needs a high level of oxygen to be stored. Oxygen debt is created due to build-up of lactic acid in the muscles, which needs a high level of oxygen to be oxidized. Oxygen debt is created due to build-up of lactic acid in the muscles, which needs a high level of carbon dioxide to be oxidized. Which of these statements regarding facilitated diffusion across a cell membrane is true? It is a kind of active transport (e.g., ATP hydrolysis) that requires transmembrane/carrier proteins. It is a kind of active transport (e.g., ATP hydrolysis) that requires protein pumps. It is a kind of passive transport (i.e., does not use energy such as hydrolysis of ATP) that requires transmembrane/carrier proteins. It is a kind of passive transport (i.e., does not use energy such as hydrolysis of ATP) that does not require transmembrane/carrier proteins. Phalanges are bones present in which parts of the body? fingers only cranium/skull ears fingers and toes Which statement regarding ball and socket joints is true? Ball and socket joints are uni-axial joints, which are highly mobile, allowing rotation around a central axis. Ball and socket joints are bi-axial joints, which are mobile, allowing movement in two planes. Ball and socket joints are multi-axial joints, which are highly mobile, allowing movement in multiple axes and planes. Ball and socket joints are uni-axial joints, which are mobile, allowing movement in a single axis and plane. Ball and socket joints, pivot joints, plane joints, and hinge joints are which type of joints? Ball and socket and pivot joints are synovial joints. Plane and hinge joints are cartilaginous joints. All of them are cartilaginous joints. Ball and socket joints are synovial joints. The rest are fibrous joints. All of them are synovial joints. Cardiac muscles exhibit which of these features? striated, involuntary, intercalated discs present striated, involuntary, intercalated discs not present striated, voluntary, intercalated discs present unstriated, involuntary, intercalated discs present Fill in the blank: The hepatic portal vein carries ____, ____ blood from the ____ to the ____. oxygenated, nutrient-rich, intestines, liver deoxygenated, nutrient-rich, liver, stomach deoxygenated, nutrient-rich, intestines, liver deoxygenated, nutrient-poor, liver, intestines On each side of the body, the brachiocephalic veins are formed by the union of which two veins? external jugular veins and subclavian veins external jugular and internal jugular veins internal jugular veins and subclavian veins common carotid and subclavian veins Large lymphatic trunks unite to form which two main vessels of the lymphatic system? left lymphatic duct and thoracic duct thoracic duct and superior vena cava right lymphatic duct and thoracic duct right lymphatic duct and left subclavian vein Which of these is not a lymphoid organ? liver tonsils thymus spleen Which of these is not a part of the central nervous system? tract (bundle of nerve fibers/axons) brain spinal cord cranial nerves Which structure is not considered a part of the rib cage? the lumbar vertebrae costal cartilage sternum the thoracic vertebrae Which of these is known as the pacemaker of the heart? SA node cardiac plexus (nerve fibers) AV node muscle fibers of the atria Which valve is found between the left atrium and the left ventricle? aortic valve bicuspid (mitral) valve tricuspid AV valve tricuspid (mitral) valve Which layer of the skin contains hair follicles, sweat glands, and nerves? the epidermis the subcutaneous layer the basal layer the dermis Which element is essential for the normal production of the hormone thyroxine? iodine magnesium calcium and vitamin D phosphorus Vitamin A, also known as ____, is a ____ vitamin. Its deficiency can lead to ____. calciferol, fat-soluble, osteoporosis ascorbic acid, water-soluble, night blindness retinol, water-soluble, osteoporosis retinol, fat-soluble, night blindness Which of these is an example of protein-related malnutrition? kwashiorkor rickets anemia scurvy Food moves in the gastrointestinal tract by which of these processes? peristalsis of the circular and longitudinal muscles voluntary waves of contraction peristalsis of the longitudinal muscles only. peristalsis of the voluntary muscles. What is the function of amylase in the body? It breaks down starch into simpler sugars. It breaks down fat into fatty acids. It breaks down fat into glycerol. It breaks down proteins into amino acids. Which of these statements regarding the gastrointestinal tract is false? Villi present in the large intestine absorb water and mineral salts. The large intestine secretes no enzymes. The ileum absorbs B12 and bile salts. Villi contain lacteals for the absorption of fats. What is the life span and breakdown product of red blood cells? 1 year, oxyhemoglobin 2 months, biliverdin 6 months, ammonia 4 months, bilirubin. Maturation and development of T cells takes place in which region? spleen bone marrow thymus gland lymph nodes Which of these statements is false regarding blood cells? Mature red blood cells are bi-concave discs that have a central nucleus and long life span. White blood cells are larger and less abundant than red blood cells. Mature red blood cells are oval, bi-concave discs with a lifespan of 120 days. Phagocytes and lymphocytes are the most numerous types of white blood cells. During inhalation, what changes occur in the diaphragm? The diaphragm muscles relax, making it dome-shaped. The diaphragm muscles contract or tighten and the diaphragm moves downward. The abdominal muscles contract, making the diaphragm move upward. The diaphragm muscles contract or tighten and move upward. The volume of air that remains present in the lungs, even after forceful expiration/exhalation, is called ____ and is about ____ liters. tidal volume, 2.4 liters residual volume, 1.2 liters vital volume, 2 liters residual volume, 0.5 liters Which pyrimidine base is only found in RNA? uracil guanine cytosine adenine Spinal muscular atrophy (SMA) is an autosomal recessive disorder. Knowing this information, what are the chances that a child will not have the recessive allele if both of his parents are carriers? 50% 0% 25% 100% If someone is lying belly-down, their positioning is said to be what? lateral prone supine posterior Which of these statements is true for boiling, but not true for evaporation? It takes place at a specific temperature. Gas forms at the surface of the liquid. The warmer the liquid is, the faster the process. The larger the surface area of liquid, the faster the process. How does an impurity affect the melting point and boiling point of a substance? Impurity lowers the boiling point and raises the melting point. Impurity lowers the boiling point and lowers the melting point. Impurity raises the boiling point and lowers the melting point. Impurity raises the boiling point and raises the melting point. Which of these statements regarding isotopes is not true? Radio-isotopes are isotopes with unstable nuclei that emit radiations. Isotopes have the same number of protons and electrons in each atom, but a different number of neutrons in their nucleus. Isotopes are atoms of the same element with different mass numbers. Isotopes of an element have the same chemical and physical properties. Which of these patterns of the periodic table is not correct? Densities and melting points increase down any group. In non-metallic groups, reactivity decreases down a group. In metallic groups, reactivity increases down a group. Atomic size increases down a group and across a period (from left to right). Simple covalent compounds show which of the following properties? They are crystalline solids at room temperature. They are soluble in organic solvents e.g. ethanol. They conduct electricity when molten or dissolved in water. They have high melting and boiling points. The law of conservation of mass states that ____. The total mass of all products of a chemical reaction is independent of the total mass of all the reactants. They are not related. The total mass of all products of a chemical reaction is more than the total mass of all the reactants. The total mass of all products of a chemical reaction is less than the total mass of all the reactants, because some mass coverts to energy during reaction. The total mass of all products of a chemical reaction is equal to the total mass of all the reactants. What happens when a piece of zinc is placed in a copper(II) sulphate solution? Zinc displaces copper from copper(II) sulphate solution. The original blue color of the solution persists. Zinc displaces copper from copper(II) sulphate solution. Sulphur dioxide is liberated. No reaction occurs because zinc is less reactive metal than copper. Which of these statements is correct? A reducing agent removes oxygen from, or removes electrons to, another substance. An oxidizing agent removes oxygen or electrons from other substances. A reducing reagent either adds oxygen to, or removes electrons from, another substance. An oxidizing agent either adds oxygen to, or removes electrons from, other substances. What causes a moving body to resist a change in its state of motion? its speed its inertia its acceleration its momentum A change in the gravitational field affects which property of a body? temperature weight volume mass Which of these groups of physical quantities consists only of scalars? time, velocity, force mass, velocity, acceleration mass, speed, time speed, weight, acceleration A body of mass 30 kg is traveling in space at a speed of 10 m/s. Given that the formula for kinetic energy is KE=0.5⋅m⋅v2, and m is mass and v is speed of an object, what is its kinetic energy? 4600 J 120 J 1000 J 1500 J Which of these represents the correct order of some of the main energy changes that take place in a coal-fired power station? chemical, electrical, heat, kinetic chemical, heat, kinetic, electrical kinetic, heat, electrical, chemical heat, chemical, kinetic, electrical A large amount of energy is produced in the center of sun by which phenomenon? nuclear fusion nuclear fission radioactive decay chemical reaction [Show More]

Last updated: 1 year ago

Preview 1 out of 38 pages