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14,000 | NDQ_015873 | chemical reactions and energy | turning out heat | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | e |
14,001 | NDQ_015874 | chemical reactions and energy | An endothermic chemical reaction is a reaction that releases energy. | null | null | Multiple Choice | a. true, b. false | b |
14,002 | NDQ_015875 | chemical reactions and energy | how fast a reaction occurs | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | f |
14,003 | NDQ_015876 | chemical reactions and energy | The general equation for an exothermic reaction is Reactants + Energy Products. | null | null | Multiple Choice | a. true, b. false | b |
14,004 | NDQ_015877 | chemical reactions and energy | energy needed to start a reaction | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | a |
14,005 | NDQ_015878 | chemical reactions and energy | taking in heat | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | d |
14,006 | NDQ_015879 | chemical reactions and energy | Plants synthesize glucose in an endothermic chemical reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,007 | NDQ_015880 | chemical reactions and energy | number of particles of a substance in a given volume | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | c |
14,008 | NDQ_015881 | chemical reactions and energy | The law of conservation of energy does not apply to chemical reactions. | null | null | Multiple Choice | a. true, b. false | b |
14,009 | NDQ_015882 | chemical reactions and energy | Any factor that helps reactants come together lowers the activation energy. | null | null | Multiple Choice | a. true, b. false | a |
14,010 | NDQ_015890 | chemical reactions and energy | All chemical reactions involve energy. | null | null | Multiple Choice | a. true, b. false | a |
14,011 | NDQ_015891 | chemical reactions and energy | One of the most important endothermic reactions is photosynthesis. | null | null | Multiple Choice | a. true, b. false | a |
14,012 | NDQ_015892 | chemical reactions and energy | In an exothermic reaction, it takes more energy to break bonds in reactants than is released when bonds | null | null | Multiple Choice | a. true, b. false | b |
14,013 | NDQ_015893 | chemical reactions and energy | Combustion is an example of an endothermic reaction. | null | null | Multiple Choice | a. true, b. false | b |
14,014 | NDQ_015894 | chemical reactions and energy | There is no overall change in the amount of energy in chemical reactions. | null | null | Multiple Choice | a. true, b. false | a |
14,015 | NDQ_015895 | chemical reactions and energy | Only endothermic reactions need energy to get started. | null | null | Multiple Choice | a. true, b. false | b |
14,016 | NDQ_015896 | chemical reactions and energy | Energy is absorbed in exothermic reactions. | null | null | Multiple Choice | a. true, b. false | b |
14,017 | NDQ_015897 | chemical reactions and energy | An increase in temperature is a sign of an exothermic reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,018 | NDQ_015898 | chemical reactions and energy | Products have less stored chemical energy than reactants in an endothermic reaction. | null | null | Multiple Choice | a. true, b. false | b |
14,019 | NDQ_015899 | chemical reactions and energy | Catalysts in living things are called enzymes. | null | null | Multiple Choice | a. true, b. false | a |
14,020 | NDQ_015900 | properties of carbon | Cellulose is | null | null | Multiple Choice | a. one of the most common compounds on Earth., b. made by the cells of plants and animals., c. a monomer of carbon., d. all of the above | a |
14,021 | NDQ_015901 | properties of carbon | How many more valence electrons does carbon need to fill its outer energy level? | null | null | Multiple Choice | a. 1, b. 2, c. 3, d. 4 | d |
14,022 | NDQ_015902 | properties of carbon | Which type(s) of bonds can a carbon atom form with other carbon atoms? | null | null | Multiple Choice | a. single bonds, b. double bonds, c. triple bonds, d. all of the above | d |
14,023 | NDQ_015903 | properties of carbon | How many bonds can each carbon atom form? | null | null | Multiple Choice | a. 1, b. 2, c. 3, d. 4 | d |
14,024 | NDQ_015904 | properties of carbon | Forms of pure carbon include | null | null | Multiple Choice | a. methane., b. cellulose., c. diamond., d. two of the above | c |
14,025 | NDQ_015905 | properties of carbon | The plastic called polythene consists of | null | null | Multiple Choice | a. repeating monomers of ethene., b. only carbon and hydrogen atoms., c. many fullerenes joined by covalent bonds., d. two of the above | d |
14,026 | NDQ_015906 | properties of carbon | Forms of crystalline carbon include | null | null | Multiple Choice | a. cotton., b. graphite., c. charcoal., d. methane. | b |
14,027 | NDQ_015907 | properties of carbon | One of the most common naturally occurring compounds on Earth is | null | null | Multiple Choice | a. graphite., b. fullerene., c. cellulose., d. polythene. | c |
14,028 | NDQ_015908 | properties of carbon | The monomers in a polymer may be | null | null | Multiple Choice | a. all the same., b. different from one another., c. joined by metallic bonds., d. two of the above | d |
14,029 | NDQ_015909 | properties of carbon | Which statement about carbon is false? | null | null | Multiple Choice | a. It has four valence electrons., b. It forms covalent bonds with other nonmetals., c. It is found in the majority of known compounds., d. It rarely forms large compounds called polymers. | d |
14,030 | NDQ_015910 | properties of carbon | All carbon polymers are | null | null | Multiple Choice | a. naturally occurring., b. produced in labs., c. found in plastics., d. large molecules. | d |
14,031 | NDQ_015913 | properties of carbon | large molecule that consists of many smaller molecules joined together by covalent bonds | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | b |
14,032 | NDQ_015914 | properties of carbon | form of carbon in which carbon atoms are arranged in layers | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | f |
14,033 | NDQ_015917 | properties of carbon | one of the simplest carbon compounds | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | e |
14,034 | NDQ_015919 | properties of carbon | form of carbon that it is the hardest natural substance | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | d |
14,035 | NDQ_015920 | properties of carbon | Carbon is a nonmetal in group 12 of the periodic table. | null | null | Multiple Choice | a. true, b. false | b |
14,036 | NDQ_015921 | properties of carbon | small molecule joined with other small molecules by covalent bonds to form a much larger molecule | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | a |
14,037 | NDQ_015922 | properties of carbon | A structural formula uses dots to represent electrons. | null | null | Multiple Choice | a. true, b. false | b |
14,038 | NDQ_015923 | properties of carbon | form of carbon in which carbon atoms are arranged in hollow spheres | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | g |
14,039 | NDQ_015924 | properties of carbon | All carbon polymers are made in labs or factories. | null | null | Multiple Choice | a. true, b. false | b |
14,040 | NDQ_015925 | properties of carbon | carbon compound found only in plants | null | null | Multiple Choice | a. monomer, b. polymer, c. cellulose, d. diamond, e. methane, f. graphite, g. fullerene | c |
14,041 | NDQ_015927 | properties of carbon | Graphite is used as a lubricant because it is slippery. | null | null | Multiple Choice | a. true, b. false | a |
14,042 | NDQ_015928 | properties of carbon | Each molecule of methane contains four atoms of carbon. | null | null | Multiple Choice | a. true, b. false | b |
14,043 | NDQ_015935 | properties of carbon | The chief component of cellulose is carbon. | null | null | Multiple Choice | a. true, b. false | a |
14,044 | NDQ_015936 | properties of carbon | Carbon forms more compounds than any other element. | null | null | Multiple Choice | a. true, b. false | a |
14,045 | NDQ_015937 | properties of carbon | Carbon can form bonds with any other element except itself. | null | null | Multiple Choice | a. true, b. false | b |
14,046 | NDQ_015938 | properties of carbon | The carbon compound with the formula CH4 is polyethylene. | null | null | Multiple Choice | a. true, b. false | b |
14,047 | NDQ_015939 | properties of carbon | In a triple bond, two atoms share three valence electrons. | null | null | Multiple Choice | a. true, b. false | b |
14,048 | NDQ_015940 | properties of carbon | Plastics are examples of synthetic carbon polymers. | null | null | Multiple Choice | a. true, b. false | a |
14,049 | NDQ_015941 | properties of carbon | All forms of crystalline carbon have the same structure. | null | null | Multiple Choice | a. true, b. false | b |
14,050 | NDQ_015942 | properties of carbon | Carbon can combine only with hydrogen and oxygen. | null | null | Multiple Choice | a. true, b. false | b |
14,051 | NDQ_015943 | properties of carbon | Carbon forms ionic bonds with other nonmetals. | null | null | Multiple Choice | a. true, b. false | b |
14,052 | NDQ_015944 | properties of carbon | There are millions of known carbon compounds. | null | null | Multiple Choice | a. true, b. false | a |
14,053 | NDQ_015945 | hydrocarbons | Which statement about hydrocarbons is true? | null | null | Multiple Choice | a. They are the most complex type of carbon compounds., b. They are all gases at room temperature., c. They generally do not dissolve in water., d. none of the above | c |
14,054 | NDQ_015946 | hydrocarbons | Which statement about hydrocarbons is false? | null | null | Multiple Choice | a. All of them are polar compounds., b. Most of them are obtained from fossil fuels., c. Some of them are solids at room temperature., d. They are the simplest type of carbon compounds. | a |
14,055 | NDQ_015947 | hydrocarbons | The simplest hydrocarbons are | null | null | Multiple Choice | a. unsaturated hydrocarbons., b. saturated hydrocarbons., c. aromatic hydrocarbons., d. alkenes and alkynes. | b |
14,056 | NDQ_015948 | hydrocarbons | The last part of the name of a hydrocarbon compound indicates | null | null | Multiple Choice | a. the number of bonds between carbon atoms., b. the number of carbon atoms per molecule., c. the shape of the hydrocarbon compound., d. none of the above | a |
14,057 | NDQ_015949 | hydrocarbons | The first part of the name of a hydrocarbon indicates the number of | null | null | Multiple Choice | a. bonds between carbon atoms., b. branches in the molecule., c. hydrogen atoms., d. carbon atoms. | d |
14,058 | NDQ_015950 | hydrocarbons | Hydrocarbons are used in floor wax because they | null | null | Multiple Choice | a. resist scratches., b. tend to repel water., c. dissolve well in water., d. have high melting points. | b |
14,059 | NDQ_015951 | hydrocarbons | Which of the following is an example of an unsaturated hydrocarbon? | null | null | Multiple Choice | a. methene, b. pentane, c. propane, d. ethene | d |
14,060 | NDQ_015952 | hydrocarbons | Alkanes with more carbon atoms generally have | null | null | Multiple Choice | a. higher boiling points., b. lower boiling points., c. higher melting points., d. two of the above | d |
14,061 | NDQ_015953 | hydrocarbons | Aromatic hydrocarbons generally have | null | null | Multiple Choice | a. a strong scent., b. rings of four carbon atoms., c. alternating double and triple bonds., d. all of the above | a |
14,062 | NDQ_015954 | hydrocarbons | Dead organisms in ancient seas gradually formed deposits of | null | null | Multiple Choice | a. coal., b. petroleum., c. natural gas., d. two of the above | d |
14,063 | NDQ_015956 | hydrocarbons | Hydrocarbon compounds that are burned for fuels include | null | null | Multiple Choice | a. coal., b. propane., c. kerosene., d. all of the above | d |
14,064 | NDQ_015957 | hydrocarbons | Fossil fuels include | null | null | Multiple Choice | a. wood., b. charcoal., c. petroleum., d. all of the above | c |
14,065 | NDQ_015959 | hydrocarbons | All hydrocarbons are small chemical compounds. | null | null | Multiple Choice | a. true, b. false | b |
14,066 | NDQ_015962 | hydrocarbons | Hydrocarbons are generally nonpolar compounds. | null | null | Multiple Choice | a. true, b. false | a |
14,067 | NDQ_015964 | hydrocarbons | Isomers of a given compound always have the same properties. | null | null | Multiple Choice | a. true, b. false | b |
14,068 | NDQ_015965 | hydrocarbons | Hydrocarbons are compounds that contain only carbon and hydrogen. | null | null | Multiple Choice | a. true, b. false | a |
14,069 | NDQ_015966 | hydrocarbons | Heptane is an unsaturated hydrocarbon. | null | null | Multiple Choice | a. true, b. false | b |
14,070 | NDQ_015967 | hydrocarbons | The simplest hydrocarbons are the aromatic hydrocarbons. | null | null | Multiple Choice | a. true, b. false | b |
14,071 | NDQ_015968 | hydrocarbons | Butane has branched-chain molecules. | null | null | Multiple Choice | a. true, b. false | b |
14,072 | NDQ_015969 | hydrocarbons | The size of hydrocarbon molecules influences their properties. | null | null | Multiple Choice | a. true, b. false | a |
14,073 | NDQ_015970 | hydrocarbons | Butane and iso-butane differ in their number of hydrogen atoms. | null | null | Multiple Choice | a. true, b. false | b |
14,074 | NDQ_015971 | hydrocarbons | Any hydrocarbon ending in ane has only straight-chain molecules. | null | null | Multiple Choice | a. true, b. false | b |
14,075 | NDQ_015972 | hydrocarbons | Alkenes may form straight or branchedchains but not rings. | null | null | Multiple Choice | a. true, b. false | b |
14,076 | NDQ_015973 | hydrocarbons | Hydrocarbons are used to make synthetic fabrics such as polyester. | null | null | Multiple Choice | a. true, b. false | a |
14,077 | NDQ_015974 | hydrocarbons | The physical properties of alkenes are generally similar to those of alkanes. | null | null | Multiple Choice | a. true, b. false | a |
14,078 | NDQ_015975 | hydrocarbons | Alkynes are relatively rare in nature. | null | null | Multiple Choice | a. true, b. false | a |
14,079 | NDQ_015976 | hydrocarbons | Fossil fuels formed over millions of years from dead organisms. | null | null | Multiple Choice | a. true, b. false | a |
14,080 | NDQ_015977 | hydrocarbons | Ring-shaped unsaturated hydrocarbons | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | f |
14,081 | NDQ_015978 | hydrocarbons | all compounds that consist only of carbon and hydrogen | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | d |
14,082 | NDQ_015979 | hydrocarbons | unsaturated hydrocarbons with at least one double bond | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | b |
14,083 | NDQ_015980 | hydrocarbons | ring-shaped saturated hydrocarbons | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | g |
14,084 | NDQ_015981 | hydrocarbons | saturated hydrocarbons such as ethane | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | a |
14,085 | NDQ_015982 | hydrocarbons | molecules with the same atoms but different shapes | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | e |
14,086 | NDQ_015983 | hydrocarbons | unsaturated hydrocarbons with at least one triple bond | null | null | Multiple Choice | a. alkanes, b. alkenes, c. alkynes, d. hydrocarbons, e. isomers, f. aromatic hydrocarbons, g. cycloalkanes | c |
14,087 | NDQ_015992 | carbon and living things | Classes of biochemical compounds include all of the following except | null | null | Multiple Choice | a. lipids., b. proteins., c. phosphates., d. nucleic acids. | c |
14,088 | NDQ_015994 | carbon and living things | Living things use lipids for | null | null | Multiple Choice | a. energy., b. enzymes., c. cell membranes., d. two of the above | d |
14,089 | NDQ_015996 | carbon and living things | Functions of proteins include | null | null | Multiple Choice | a. coding genetic information., b. storing energy in animals., c. regulating life processes., d. making up cell walls. | c |
14,090 | NDQ_015997 | carbon and living things | Which statement about RNA is true? | null | null | Multiple Choice | a. It has a double helix shape., b. It consists of two chains of nucleotides., c. It is needed for the synthesis of proteins., d. It contains the nitrogen base called thymine. | c |
14,091 | NDQ_016000 | carbon and living things | A nucleotide consists of a | null | null | Multiple Choice | a. phosphate group., b. nitrogen base., c. sugar., d. all of the above | d |
14,092 | NDQ_016005 | carbon and living things | All biochemical compounds contain hydrogen. | null | null | Multiple Choice | a. true, b. false | a |
14,093 | NDQ_016008 | carbon and living things | There are a total of 20 different biochemical compounds. | null | null | Multiple Choice | a. true, b. false | b |
14,094 | NDQ_016010 | carbon and living things | Some nucleic acids are hormones that regulate life processes. | null | null | Multiple Choice | a. true, b. false | b |
14,095 | NDQ_016011 | carbon and living things | Biochemical compounds are carbon-based compounds found in living things. | null | null | Multiple Choice | a. true, b. false | a |
14,096 | NDQ_016012 | carbon and living things | The simplest sugar is named sucrose. | null | null | Multiple Choice | a. true, b. false | b |
14,097 | NDQ_016013 | carbon and living things | The main function of simple carbohydrates is to store energy in animals. | null | null | Multiple Choice | a. true, b. false | b |
14,098 | NDQ_016014 | carbon and living things | Bread is a good source of starch in the diet. | null | null | Multiple Choice | a. true, b. false | a |
14,099 | NDQ_016015 | carbon and living things | We need oils to help move food wastes through the digestive tract. | null | null | Multiple Choice | a. true, b. false | b |
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