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14,200 | NDQ_016197 | artificial light | in a fluorescent light bulb, mercury gas gives off visible light. | null | null | Multiple Choice | a. true, b. false | b |
14,201 | NDQ_016199 | artificial light | gases used in halogen lights include | null | null | Multiple Choice | a. neon., b. argon., c. mercury., d. two of the above | d |
14,202 | NDQ_016200 | artificial light | a vapor light produces light by fluorescence. | null | null | Multiple Choice | a. true, b. false | b |
14,203 | NDQ_016202 | atomic forces | forces that hold together particles within the atom include | null | null | Multiple Choice | a. gravity., b. electromagnetic force., c. weak nuclear force., d. two of the above | d |
14,204 | NDQ_016205 | atomic forces | the strong nuclear force is a force of attraction between quarks. | null | null | Multiple Choice | a. true, b. false | a |
14,205 | NDQ_016206 | atomic forces | which statement about the strong nuclear force is false? | null | null | Multiple Choice | a. It can overcome the electromagnetic force pushing protons apart., b. It works over very long distances., c. It is transferred by gluons., d. two of the above | b |
14,206 | NDQ_016207 | atomic forces | the weak nuclear force is transferred by w and z bosons. | null | null | Multiple Choice | a. true, b. false | a |
14,207 | NDQ_016209 | atomic forces | up quarks can change to down quarks. | null | null | Multiple Choice | a. true, b. false | a |
14,208 | NDQ_016213 | atomic nucleus | the nucleus contains | null | null | Multiple Choice | a. protons., b. neutrons., c. electrons., d. two of the above | d |
14,209 | NDQ_016214 | atomic nucleus | outside of the nucleus, an atom is mostly empty space. | null | null | Multiple Choice | a. true, b. false | a |
14,210 | NDQ_016215 | atomic nucleus | the nucleus makes up about 1/100th of the total radius of an atom. | null | null | Multiple Choice | a. true, b. false | b |
14,211 | NDQ_016216 | atomic nucleus | the nucleus has almost all of the mass of an atom. | null | null | Multiple Choice | a. true, b. false | a |
14,212 | NDQ_016217 | atomic nucleus | what force holds together the nucleus? | null | null | Multiple Choice | a. The force of attraction between positive and negative particles., b. The force of attraction between the nucleus and electrons., c. The strong nuclear force between protons and neutrons., d. The weak atomic force between neutrons and electrons. | c |
14,213 | NDQ_016219 | atomic nucleus | there is an electric force of repulsion between neutrons and protons. | null | null | Multiple Choice | a. true, b. false | b |
14,214 | NDQ_016224 | atomic number | all atoms of a given element have the same number of protons. | null | null | Multiple Choice | a. true, b. false | a |
14,215 | NDQ_016225 | atomic number | atoms of different elements always have different numbers of protons. | null | null | Multiple Choice | a. true, b. false | a |
14,216 | NDQ_016228 | atomic number | which statement about the mass of subatomic particles is false? | null | null | Multiple Choice | a. A proton has a mass of 1 amu., b. A neutron has slightly more mass than a proton., c. An electron has slightly less mass than a proton., d. none of the above | c |
14,217 | NDQ_016229 | atomic number | a carbon atom has six protons and six neutrons. what is its atomic number? | null | null | Multiple Choice | a. 6, b. 12, c. 36, d. none of the above | a |
14,218 | NDQ_016230 | atomic number | what is the mass number of the carbon atom in question 8? | null | null | Multiple Choice | a. 6, b. 12, c. 18, d. 72 | b |
14,219 | NDQ_016243 | balancing chemical equations | which of the following is the general form of a chemical equation? | null | null | Multiple Choice | a. Reactants = Products, b. Products + Reactants = 100%, c. Products β Reactants, d. Reactants β Products | d |
14,220 | NDQ_016245 | balancing chemical equations | which of the following equations is balanced? | null | null | Multiple Choice | a. H2 + O2 β H2O, b. 2H2 + O2 β 2H2O, c. H2 + 2O2 β 2H2O, d. 2H2 + O2 β H2O | b |
14,221 | NDQ_016246 | balancing chemical equations | numbers called subscripts are used to balance chemical equations. | null | null | Multiple Choice | a. true, b. false | b |
14,222 | NDQ_016248 | balancing chemical equations | which of the following rules should you follow to balance chemical equations? | null | null | Multiple Choice | a. Change only the subscripts., b. Use the smallest possible subscripts., c. Add coefficients as needed., d. two of the above | c |
14,223 | NDQ_016250 | balancing chemical equations | which coefficient will balance the following equation? zn + hcl zncl2 + h2 | null | null | Multiple Choice | a. 2, b. 3, c. 4, d. none of the above | a |
14,224 | NDQ_016265 | beta decay | which particle is emitted from a nucleus when it undergoes beta-minus decay? | null | null | Multiple Choice | a. electron, b. positron, c. anti-electron, d. proton | a |
14,225 | NDQ_016266 | beta decay | beta-positive decay begins with a proton. | null | null | Multiple Choice | a. true, b. false | a |
14,226 | NDQ_016267 | beta decay | in the following symbol for a beta-minus particle, what does the superscript represent? | null | null | Multiple Choice | a. charge, b. mass, c. energy, d. none of the above | b |
14,227 | NDQ_016270 | beta decay | beta particles can travel only a few centimeters through the air. | null | null | Multiple Choice | a. true, b. false | b |
14,228 | NDQ_016271 | beta decay | beta-positive decay results in a nucleus with one less proton. | null | null | Multiple Choice | a. true, b. false | a |
14,229 | NDQ_016273 | biochemical compound classification | there are only about 100 different biochemical compounds. | null | null | Multiple Choice | a. true, b. false | b |
14,230 | NDQ_016275 | biochemical compound classification | the similarity in biochemical compounds between living things provides some of the best evidence for evolution. | null | null | Multiple Choice | a. true, b. false | a |
14,231 | NDQ_016277 | biochemical compound classification | functions of carbohydrates include | null | null | Multiple Choice | a. storing energy in plants., b. storing energy in animals., c. making up cell walls in plants., d. two of the above | d |
14,232 | NDQ_016278 | biochemical compound classification | functions of nucleic acids include | null | null | Multiple Choice | a. storing genetic information in cells., b. speeding up biochemical reactions., c. regulating life processes., d. all of the above | a |
14,233 | NDQ_016279 | biochemical compound classification | elements found in proteins but not in other biochemical compounds include | null | null | Multiple Choice | a. sulfur., b. nitrogen., c. phosphorus., d. two of the above | a |
14,234 | NDQ_016280 | biochemical compound classification | almost all biochemical compounds are polymers. | null | null | Multiple Choice | a. true, b. false | a |
14,235 | NDQ_016284 | biochemical reaction chemistry | catabolic reactions are chemical reactions in living things that | null | null | Multiple Choice | a. release energy., b. are endothermic., c. break bonds., d. two of the above | d |
14,236 | NDQ_016285 | biochemical reaction chemistry | anabolic reactions are chemical reactions in living things that | null | null | Multiple Choice | a. form larger molecules., b. are exothermic., c. release energy., d. two of the above | a |
14,237 | NDQ_016287 | biochemical reaction chemistry | the reactants of photosynthesis are oxygen and water. | null | null | Multiple Choice | a. true, b. false | b |
14,238 | NDQ_016289 | biochemical reaction chemistry | photosynthesis is an anabolic reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,239 | NDQ_016290 | biochemical reaction chemistry | cellular respiration is a catabolic reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,240 | NDQ_016294 | bohrs atomic model | electrons with the most energy are located closest to the nucleus of the atom. | null | null | Multiple Choice | a. true, b. false | b |
14,241 | NDQ_016295 | bohrs atomic model | bohr hypothesized that if an electron gained just the right amount of energy, it would | null | null | Multiple Choice | a. jump to the next higher energy level., b. drop down to the next lower energy level., c. move halfway to the next higher energy level., d. crash into the nucleus of the atom. | a |
14,242 | NDQ_016297 | bohrs atomic model | the idea of the quantum was first introduced by | null | null | Multiple Choice | a. Bohr., b. Planck., c. Thomson., d. Rutherford. | b |
14,243 | NDQ_016298 | bohrs atomic model | energy levels around the atomic nucleus correspond to quantum increases in energy. | null | null | Multiple Choice | a. true, b. false | a |
14,244 | NDQ_016312 | bond polarity | which type(s) of chemical bonds may be polar bonds? | null | null | Multiple Choice | a. ionic bonds, b. metallic bonds, c. covalent bonds, d. two of the above | c |
14,245 | NDQ_016315 | bond polarity | which of the following molecules has (have) polar bonds? | null | null | Multiple Choice | a. water, b. carbon dioxide, c. formaldehyde, d. all of the above | d |
14,246 | NDQ_016316 | bond polarity | all molecules with polar bonds are polar molecules. | null | null | Multiple Choice | a. true, b. false | b |
14,247 | NDQ_016320 | bond polarity | the oxygen end of a water molecule is positively charged. | null | null | Multiple Choice | a. true, b. false | b |
14,248 | NDQ_016334 | buoyancy | a fluid exerts pressure only in an upward direction. | null | null | Multiple Choice | a. true, b. false | b |
14,249 | NDQ_016335 | buoyancy | fluid pressure is greater at greater depth. | null | null | Multiple Choice | a. true, b. false | a |
14,250 | NDQ_016336 | buoyancy | the fluid below an object exerts greater force on it than the fluid above the object. | null | null | Multiple Choice | a. true, b. false | a |
14,251 | NDQ_016338 | buoyancy | an object floats in a fluid when the | null | null | Multiple Choice | a. buoyant force acting on the object is greater than the objectβs weight., b. objectβs weight is greater than the buoyant force acting on the object., c. objectβs weight is the same as buoyant force acting on the object., d. buoyant force acts only under and not above the object. | a |
14,252 | NDQ_016340 | buoyancy | a denser substance will | null | null | Multiple Choice | a. float on a less dense fluid., b. sink in a less dense fluid., c. become less dense in a less dense fluid., d. become more dense in a less dense fluid. | b |
14,253 | NDQ_016342 | calculating acceleration from force and mass | any change in an objects motion is called velocity. | null | null | Multiple Choice | a. true, b. false | b |
14,254 | NDQ_016344 | calculating acceleration from force and mass | the greater the net force acting on an object, the greater its acceleration will be. | null | null | Multiple Choice | a. true, b. false | a |
14,255 | NDQ_016345 | calculating acceleration from force and mass | for a given net force, an object will accelerate less if it has a greater | null | null | Multiple Choice | a. mass., b. volume., c. speed., d. none of the above | a |
14,256 | NDQ_016348 | calculating acceleration from force and mass | one newton is the force needed to cause a | null | null | Multiple Choice | a. 1-kg object to accelerate at 1 m/s2., b. 1-g object to accelerate at 1 cm/s2., c. 1-kg object to accelerate at 1 km/s2., d. none of the above | a |
14,257 | NDQ_016349 | calculating acceleration from force and mass | the si unit for acceleration is | null | null | Multiple Choice | a. cm/s2., b. m/s2., c. km/s2., d. none of the above | b |
14,258 | NDQ_016354 | calculating acceleration from velocity and time | which equation is used to calculate average acceleration when only speed is changing? | null | null | Multiple Choice | a. average acceleration = Ξv/Ξt, b. average acceleration = Ξt/Ξv, c. average acceleration = Ξd/Ξt, d. average acceleration = v/Ξt | a |
14,259 | NDQ_016357 | calculating acceleration from velocity and time | it is easier to calculate acceleration for any given moment of time than to calculate average acceleration for a period of time. | null | null | Multiple Choice | a. true, b. false | b |
14,260 | NDQ_016359 | calculating acceleration from velocity and time | the si unit for acceleration is | null | null | Multiple Choice | a. m/s., b. m/s2., c. m/s2., d. none of the above | c |
14,261 | NDQ_016360 | calculating acceleration from velocity and time | which of the following units could represent acceleration? | null | null | Multiple Choice | a. cm/s, b. km/h2, c. m/h, d. cm/h | b |
14,262 | NDQ_016374 | calculating work | when calculating work, force is measured in | null | null | Multiple Choice | a. joules., b. Newtons., c. foot-pounds., d. none of the above | b |
14,263 | NDQ_016377 | calculating work | one joule equals the amount of work that is done when 1 n of force moves an object over a distance of | null | null | Multiple Choice | a. 1 cm., b. 1 m., c. 1 km., d. none of the above | b |
14,264 | NDQ_016378 | calculating work | you can calculate force from work and distance with the equation | null | null | Multiple Choice | a. Force = Work x Distance., b. Force = Work/Distance., c. Force = Distance/Work., d. Force = Work + Distance. | b |
14,265 | NDQ_016379 | calculating work | you can calculate distance from work and force with the equation | null | null | Multiple Choice | a. Distance = Work x Force., b. Distance = Work/Force., c. Distance = Force/Work., d. Distance = Work + Force. | b |
14,266 | NDQ_016383 | carbohydrate classification | carbohydrates consist of atoms of | null | null | Multiple Choice | a. carbon., b. hydrogen., c. oxygen., d. all of the above | d |
14,267 | NDQ_016387 | carbohydrate classification | plants stores extra glucose as starches. | null | null | Multiple Choice | a. true, b. false | a |
14,268 | NDQ_016391 | carbohydrate classification | cellulose is a polymer of starch. | null | null | Multiple Choice | a. true, b. false | b |
14,269 | NDQ_016392 | carbon bonding | about half of all known compounds contain carbon. | null | null | Multiple Choice | a. true, b. false | b |
14,270 | NDQ_016396 | carbon bonding | how many chemical bonds can each carbon atom form? | null | null | Multiple Choice | a. 1, b. 2, c. 3, d. 4 | d |
14,271 | NDQ_016398 | carbon bonding | methane is an example of a hydrocarbon. | null | null | Multiple Choice | a. true, b. false | a |
14,272 | NDQ_016399 | carbon bonding | carbon forms triple bonds with other carbon atoms in the compound named | null | null | Multiple Choice | a. ethane., b. ethene., c. ethyne., d. two of the above | c |
14,273 | NDQ_016400 | carbon bonding | when two carbon atoms form triple bonds, how many electrons do they share? | null | null | Multiple Choice | a. 3, b. 4, c. 5, d. 6 | d |
14,274 | NDQ_016401 | carbon bonding | carbon can form more compounds than any other element. | null | null | Multiple Choice | a. true, b. false | a |
14,275 | NDQ_016405 | carbon monomers and polymers | examples of naturally occurring carbon polymers include | null | null | Multiple Choice | a. cellulose., b. rubber., c. plastic., d. two of the above | d |
14,276 | NDQ_016406 | carbon monomers and polymers | rubber consists of the monomer named ethylene. | null | null | Multiple Choice | a. true, b. false | b |
14,277 | NDQ_016407 | carbon monomers and polymers | any given polymer consists of just one type of monomer. | null | null | Multiple Choice | a. true, b. false | b |
14,278 | NDQ_016413 | catalysts | a catalyst is a reactant in the reaction it catalyzes. | null | null | Multiple Choice | a. true, b. false | b |
14,279 | NDQ_016414 | catalysts | a catalyst is used up in the reaction it catalyzes. | null | null | Multiple Choice | a. true, b. false | b |
14,280 | NDQ_016417 | catalysts | the compound that speeds up the breakdown of starch to sugar in your mouth is | null | null | Multiple Choice | a. an enzyme., b. called amylase., c. also found in your small intestine., d. all of the above | d |
14,281 | NDQ_016418 | catalysts | more than 1000 different enzymes are necessary for human life. | null | null | Multiple Choice | a. true, b. false | a |
14,282 | NDQ_016419 | catalysts | the presence or absence of a catalyst is the only factor that affects the rate of a chemical reaction. | null | null | Multiple Choice | a. true, b. false | b |
14,283 | NDQ_016425 | cellular respiration reactions | organisms that make glucose are called autotrophs. | null | null | Multiple Choice | a. true, b. false | a |
14,284 | NDQ_016426 | cellular respiration reactions | cellular respiration takes place only in the cells of heterotrophs. | null | null | Multiple Choice | a. true, b. false | b |
14,285 | NDQ_016428 | cellular respiration reactions | the chemical reactions of cellular respiration are anabolic reactions. | null | null | Multiple Choice | a. true, b. false | b |
14,286 | NDQ_016429 | cellular respiration reactions | which compound directly powers biochemical reactions in cells? | null | null | Multiple Choice | a. glucose, b. carbon dioxide, c. adenosine triphosphate, d. none of the above | c |
14,287 | NDQ_016430 | cellular respiration reactions | during cellular respiration, chemical energy stored in glucose changes to | null | null | Multiple Choice | a. heat., b. light., c. chemical energy in ATP, d. two of the above | d |
14,288 | NDQ_016463 | chemical bond | valence electrons are the basis of all chemical bonds. | null | null | Multiple Choice | a. true, b. false | a |
14,289 | NDQ_016466 | chemical bond | in covalent bonds, atoms | null | null | Multiple Choice | a. share electrons., b. transfer electrons., c. lose or gain electrons., d. two of the above | a |
14,290 | NDQ_016468 | chemical bond | an example of a compound that contains ionic bonds is water. | null | null | Multiple Choice | a. true, b. false | b |
14,291 | NDQ_016469 | chemical bond | a metallic bond is a bond between a positively charged metal ion and | null | null | Multiple Choice | a. a negatively charged halogen ion., b. a negatively charged nonmetal ion., c. the valence electrons of several metal ions., d. the valence electrons of a halogen ion. | c |
14,292 | NDQ_016470 | chemical bond | metallic bonds form a lattice-like structure. | null | null | Multiple Choice | a. true, b. false | a |
14,293 | NDQ_016471 | chemical bond | metals can be involved in | null | null | Multiple Choice | a. covalent bonds., b. metallic bonds., c. ionic bonds., d. two of the above | d |
14,294 | NDQ_016483 | chemical equations | the substances that form in a chemical reaction are completely different from the substances that start the reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,295 | NDQ_016489 | chemical equations | a chemical equation is balanced when | null | null | Multiple Choice | a. the reactants are the same as the products., b. the same atoms and molecules appear on each side of the equation., c. the same number of each type of atom appears on both sides of the arrow., d. none of the above | c |
14,296 | NDQ_016491 | chemical equations | which of the following chemical equations is balanced? | null | null | Multiple Choice | a. 3Fe + 3O2 β 3Fe2O3, b. 2Fe + O2 β Fe2O3, c. 4Fe + 2O2 β 3Fe2O3, d. 4Fe + 3O2 β 2Fe2O3 | d |
14,297 | NDQ_016492 | chemical formula | a given chemical compound always has exactly the same ratio of elements. | null | null | Multiple Choice | a. true, b. false | a |
14,298 | NDQ_016496 | chemical formula | when there is just one atom of an element in a molecule, this atom is represented by the | null | null | Multiple Choice | a. subscript 1., b. subscript 0., c. absence of a subscript., d. none of the above | c |
14,299 | NDQ_016497 | chemical formula | in the formula for an ionic compound, the negative ion is always written first. | null | null | Multiple Choice | a. true, b. false | b |
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