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13,900 | NDQ_015735 | introduction to chemical reactions | A banana turning brown is a chemical change. | null | null | Multiple Choice | a. true, b. false | a |
13,901 | NDQ_015737 | introduction to chemical reactions | Wax melting is an example of a chemical reaction. | null | null | Multiple Choice | a. true, b. false | b |
13,902 | NDQ_015738 | introduction to chemical reactions | The products and reactants of a chemical reaction have different atoms. | null | null | Multiple Choice | a. true, b. false | b |
13,903 | NDQ_015740 | introduction to chemical reactions | All chemical reactions are reversible. | null | null | Multiple Choice | a. true, b. false | b |
13,904 | NDQ_015742 | introduction to chemical reactions | Rusting is an example of a chemical change. | null | null | Multiple Choice | a. true, b. false | a |
13,905 | NDQ_015745 | introduction to chemical reactions | Condensation is a type of chemical reaction. | null | null | Multiple Choice | a. true, b. false | b |
13,906 | NDQ_015746 | introduction to chemical reactions | A change in temperature is a common sign of a chemical reaction. | null | null | Multiple Choice | a. true, b. false | a |
13,907 | NDQ_015750 | introduction to chemical reactions | substance produced in a chemical reaction | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | e |
13,908 | NDQ_015751 | introduction to chemical reactions | force of attraction that breaks and reforms in a chemical reaction | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | d |
13,909 | NDQ_015752 | introduction to chemical reactions | substance that starts a chemical reaction | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | g |
13,910 | NDQ_015753 | introduction to chemical reactions | example of chemical change | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | f |
13,911 | NDQ_015754 | introduction to chemical reactions | balance between opposing changes | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | c |
13,912 | NDQ_015755 | introduction to chemical reactions | process in which some substances become different substances | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | a |
13,913 | NDQ_015756 | introduction to chemical reactions | example of a physical change | null | null | Multiple Choice | a. chemical reaction, b. melting, c. equilibrium, d. chemical bond, e. product, f. rusting, g. reactant | b |
13,914 | NDQ_015757 | introduction to chemical reactions | What do the formation of rust and the formation of cottage cheese have in common? | null | null | Multiple Choice | a. Both occur very quickly., b. Both involve chemical reactions., c. Both are changes of state., d. Both are physical processes. | b |
13,915 | NDQ_015758 | introduction to chemical reactions | Which of the following changes does not involve chemical reactions? | null | null | Multiple Choice | a. clouds forming, b. candles burning, c. leaves turning color, d. fire extinguishers foaming | a |
13,916 | NDQ_015759 | introduction to chemical reactions | During chemical reactions, atoms are | null | null | Multiple Choice | a. rearranged., b. created or destroyed., c. changed to new elements., d. two of the above | a |
13,917 | NDQ_015760 | introduction to chemical reactions | There is no overall change in reactants and products whenever a chemical reaction | null | null | Multiple Choice | a. goes in just one direction., b. goes in two directions., c. reaches equilibrium., d. proceeds slowly. | c |
13,918 | NDQ_015761 | introduction to chemical reactions | Evidence of chemical reactions include changes in | null | null | Multiple Choice | a. state., b. color., c. temperature., d. two of the above | d |
13,919 | NDQ_015763 | chemical equations | In chemical equations, reactants and products are represented by | null | null | Multiple Choice | a. plus signs and arrows., b. elements and compounds., c. coefficients and subscripts., d. chemical symbols and chemical formulas. | d |
13,920 | NDQ_015764 | chemical equations | A shorthand way of showing how atoms are rearranged in a chemical reaction is a chemical | null | null | Multiple Choice | a. symbol., b. formula., c. equation., d. letter. | c |
13,921 | NDQ_015765 | chemical equations | When there is more than one reactant in a chemical equation, they are separated by | null | null | Multiple Choice | a. arrows., b. subscripts., c. plus signs., d. coefficients. | c |
13,922 | NDQ_015766 | chemical equations | Which chemical equation is not balanced? | null | null | Multiple Choice | a. 2Na + Cl2 2NaCl, b. C + O2 CO2, c. NO + O2 2NO2, d. N2 + 3H2 2NH3 | c |
13,923 | NDQ_015767 | chemical equations | In the reaction represented by the chemical equation 2Cu + O2 2CuO, new bonds are formed in | null | null | Multiple Choice | a. 2Cu., b. O2 ., c. CuO., d. none of the above | c |
13,924 | NDQ_015768 | chemical equations | If there is more than one product in a chemical equation, the products are separated by | null | null | Multiple Choice | a. plus signs., b. minus signs., c. equals signs., d. two-way arrows. | a |
13,925 | NDQ_015769 | chemical equations | What is the missing coefficient in the following chemical equation? CH4 + ?O2 CO2 + 2H2 O | null | null | Multiple Choice | a. 3, b. 2, c. 1, d. 0 | b |
13,926 | NDQ_015770 | chemical equations | Chemical equations must be balanced because matter cannot be | null | null | Multiple Choice | a. created., b. destroyed., c. changed., d. two of the above | d |
13,927 | NDQ_015771 | chemical equations | Which chemical equation is balanced? | null | null | Multiple Choice | a. 2Na + Cl2 2NaCl, b. Na + 2Cl2 2NaCl, c. 2Na + 2Cl2 2NaCl, d. Na + Cl2 NaCl | a |
13,928 | NDQ_015772 | chemical equations | Which chemical equation correctly represents the reaction in which carbon combines with oxygen? | null | null | Multiple Choice | a. C2 + O2 2CO, b. C2 + 2O C2 O2, c. C + O2 CO2, d. 2C + O C2 O | c |
13,929 | NDQ_015773 | chemical equations | What is the missing coefficient in the following chemical equation? ?NO + O2 2NO2 ? | null | null | Multiple Choice | a. 0, b. 1, c. 2, d. 4 | c |
13,930 | NDQ_015783 | chemical equations | The symbol 2O2 represents two molecules of oxygen. | null | null | Multiple Choice | a. true, b. false | a |
13,931 | NDQ_015785 | chemical equations | A coefficient of 1 usually is not written. | null | null | Multiple Choice | a. true, b. false | a |
13,932 | NDQ_015787 | chemical equations | Subscripts are used to balance chemical equations. | null | null | Multiple Choice | a. true, b. false | b |
13,933 | NDQ_015789 | chemical equations | The general form of a chemical equation is Reactants = Products. | null | null | Multiple Choice | a. true, b. false | b |
13,934 | NDQ_015790 | chemical equations | The first step in balancing a chemical equation is counting atoms. | null | null | Multiple Choice | a. true, b. false | a |
13,935 | NDQ_015791 | chemical equations | A chemical equation must balance only when the reaction reversible. | null | null | Multiple Choice | a. true, b. false | b |
13,936 | NDQ_015792 | chemical equations | The symbol CO2 represents two molecules of carbon monoxide. | null | null | Multiple Choice | a. true, b. false | b |
13,937 | NDQ_015793 | chemical equations | The symbol 2H2 represents two atoms of hydrogen. | null | null | Multiple Choice | a. true, b. false | b |
13,938 | NDQ_015794 | chemical equations | Coefficients are used to balance chemical equations. | null | null | Multiple Choice | a. true, b. false | a |
13,939 | NDQ_015795 | chemical equations | In balancing chemical equations, you should use the smallest subscripts possible. | null | null | Multiple Choice | a. true, b. false | b |
13,940 | NDQ_015796 | chemical equations | The number of each type of molecule must be the same on both sides of a chemical equation. | null | null | Multiple Choice | a. true, b. false | b |
13,941 | NDQ_015797 | chemical equations | Changing coefficients changes the substances involved in a chemical reaction. | null | null | Multiple Choice | a. true, b. false | b |
13,942 | NDQ_015798 | chemical equations | Chemists use a standard method to represent chemical reactions. | null | null | Multiple Choice | a. true, b. false | a |
13,943 | NDQ_015799 | chemical equations | The chemical equation H2 CO3 H2 O + CO2 is balanced. | null | null | Multiple Choice | a. true, b. false | a |
13,944 | NDQ_015800 | chemical equations | Water is the reactant in the chemical equation H2 O H2 + O2 . | null | null | Multiple Choice | a. true, b. false | a |
13,945 | NDQ_015801 | chemical equations | symbolic representation of a chemical reaction | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | d |
13,946 | NDQ_015802 | chemical equations | example of a coefficient | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | e |
13,947 | NDQ_015803 | chemical equations | symbol of a chemical compound | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | g |
13,948 | NDQ_015804 | chemical equations | example of a subscript | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | c |
13,949 | NDQ_015805 | chemical equations | number showing how many atoms or molecules of a given element or compound are involved in a chemical | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | b |
13,950 | NDQ_015806 | chemical equations | symbol of an chemical element | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | a |
13,951 | NDQ_015807 | chemical equations | number showing how many atoms of a given element are in a molecule | null | null | Multiple Choice | a. chemical symbol, b. coefficient, c. H2, d. chemical equation, e. 2H, f. subscript, g. chemical formula | f |
13,952 | NDQ_015808 | types of chemical reactions | one reactant breaking down into two or more products | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | c |
13,953 | NDQ_015809 | types of chemical reactions | The general equation for a synthesis reaction is | null | null | Multiple Choice | a. AB A + B, b. A + BC B + AC, c. A+BC, d. AB + C A + BC | c |
13,954 | NDQ_015810 | types of chemical reactions | ions changing places in two compounds | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | e |
13,955 | NDQ_015811 | types of chemical reactions | Which of the following is a decomposition reaction? | null | null | Multiple Choice | a. 2Na + Cl2 2NaCl, b. 2H2 O 2H2 + O2, c. CH4 + O2 CO2 + H2 O, d. NaCl + AgF NaF + AgCl | b |
13,956 | NDQ_015812 | types of chemical reactions | two reactants combining to form a single product | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | a |
13,957 | NDQ_015813 | types of chemical reactions | Which type of reaction is represented by the following chemical equation? 2K + 2H2 O 2KOH + H2 | null | null | Multiple Choice | a. double replacement, b. single replacement, c. decomposition, d. synthesis | b |
13,958 | NDQ_015814 | types of chemical reactions | Which of the following is always a product of a combustion reaction? | null | null | Multiple Choice | a. water, b. ashes, c. smoke, d. oxygen | a |
13,959 | NDQ_015815 | types of chemical reactions | substance reacting quickly with oxygen | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | b |
13,960 | NDQ_015816 | types of chemical reactions | one of the reactants in a combustion reaction | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | g |
13,961 | NDQ_015817 | types of chemical reactions | In living cells, energy is produced by the process called | null | null | Multiple Choice | a. photosynthesis., b. sugar synthesis., c. cellular respiration., d. glucose decomposition. | c |
13,962 | NDQ_015819 | types of chemical reactions | one ion taking the place of another in a compound | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | d |
13,963 | NDQ_015820 | types of chemical reactions | another term for a combustion reaction | null | null | Multiple Choice | a. synthesis reaction, b. combustion reaction, c. decomposition reaction, d. single replacement reaction, e. double replacement reaction, f. burning, g. fuel | f |
13,964 | NDQ_015822 | types of chemical reactions | Which of the following is an example of a synthesis reaction? | null | null | Multiple Choice | a. 2NO + O2 2NO2, b. 2Na + Cl2 2NaCl2, c. H2 O H2 + O2, d. two of the above | d |
13,965 | NDQ_015825 | types of chemical reactions | A decomposition reaction is represented by the general equation | null | null | Multiple Choice | a. A + B + C AB + C., b. A + BC AB + C., c. AB A + B, d. none of the above | c |
13,966 | NDQ_015827 | types of chemical reactions | Which type of reaction is represented by the following chemical equation? NaCl + AgF NaF + AgCl | null | null | Multiple Choice | a. synthesis, b. decomposition, c. single replacement, d. double replacement | d |
13,967 | NDQ_015828 | types of chemical reactions | A synthesis reaction occurs when two or more reactants combine to form a single product. | null | null | Multiple Choice | a. true, b. false | a |
13,968 | NDQ_015829 | types of chemical reactions | Which of the following is always a reactant in a combustion reaction? | null | null | Multiple Choice | a. water, b. oxygen, c. carbon dioxide, d. two of the above | b |
13,969 | NDQ_015830 | types of chemical reactions | Another term for a combustion reaction is decomposition. | null | null | Multiple Choice | a. true, b. false | b |
13,970 | NDQ_015831 | types of chemical reactions | Methane is a | null | null | Multiple Choice | a. hydrocarbon., b. component of natural gas., c. compound containing only carbon and hydrogen., d. all of the above | d |
13,971 | NDQ_015832 | types of chemical reactions | What do living cells use for fuel? | null | null | Multiple Choice | a. oxygen, b. water, c. glucose, d. hydrocarbons | c |
13,972 | NDQ_015833 | types of chemical reactions | Fossil fuels such as oil and natural gas consist of hydrocarbons. | null | null | Multiple Choice | a. true, b. false | a |
13,973 | NDQ_015834 | types of chemical reactions | The reaction in which carbon dioxide and water combine to form glucose | null | null | Multiple Choice | a. is a combustion reaction., b. is called photosynthesis., c. takes place in all living cells., d. all of the above | b |
13,974 | NDQ_015835 | types of chemical reactions | The fuel that cells use for energy is oxygen. | null | null | Multiple Choice | a. true, b. false | b |
13,975 | NDQ_015836 | types of chemical reactions | Plants combine carbon dioxide and water to form glucose. | null | null | Multiple Choice | a. true, b. false | a |
13,976 | NDQ_015837 | types of chemical reactions | Water decomposes when an electric current passes through it. | null | null | Multiple Choice | a. true, b. false | a |
13,977 | NDQ_015838 | types of chemical reactions | A combustion reaction usually gives off heat and light. | null | null | Multiple Choice | a. true, b. false | a |
13,978 | NDQ_015839 | types of chemical reactions | The burning of glucose in cells is called cellular combustion. | null | null | Multiple Choice | a. true, b. false | b |
13,979 | NDQ_015840 | types of chemical reactions | Sodium chloride forms in a decomposition reaction. | null | null | Multiple Choice | a. true, b. false | b |
13,980 | NDQ_015841 | types of chemical reactions | Methane and oxygen combine in a synthesis reaction. | null | null | Multiple Choice | a. true, b. false | b |
13,981 | NDQ_015842 | types of chemical reactions | One product of the reaction in question 5 is carbon dioxide. | null | null | Multiple Choice | a. true, b. false | a |
13,982 | NDQ_015843 | types of chemical reactions | There are two types of decomposition reactions. | null | null | Multiple Choice | a. true, b. false | b |
13,983 | NDQ_015844 | types of chemical reactions | Carbon dioxide forms only in combustion reactions. | null | null | Multiple Choice | a. true, b. false | b |
13,984 | NDQ_015845 | types of chemical reactions | The general equation AB + CD AD + CB represents a replacement reaction. | null | null | Multiple Choice | a. true, b. false | a |
13,985 | NDQ_015846 | types of chemical reactions | The chemical reaction 2K + 2H2 O 2KOH + H2 is a replacement reaction. | null | null | Multiple Choice | a. true, b. false | a |
13,986 | NDQ_015854 | chemical reactions and energy | Which statement describes a role of energy in chemical reactions? | null | null | Multiple Choice | a. Energy is created in exothermic reactions., b. Energy is always released in chemical reactions., c. Energy is needed for chemical reactions to start., d. Energy is destroyed in endothermic reactions. | c |
13,987 | NDQ_015855 | chemical reactions and energy | All chemical reactions need energy to | null | null | Multiple Choice | a. form bonds in products., b. break bonds in reactants., c. get started., d. two of the above | d |
13,988 | NDQ_015856 | chemical reactions and energy | The energy needed for photosynthesis is in the form of | null | null | Multiple Choice | a. glucose., b. oxygen., c. light., d. heat. | c |
13,989 | NDQ_015857 | chemical reactions and energy | Which statement about exothermic reactions is false? | null | null | Multiple Choice | a. They need activation energy., b. They include combustion., c. They give off energy., d. They take in heat. | d |
13,990 | NDQ_015858 | chemical reactions and energy | When products have less chemical energy than reactants, a chemical reaction | null | null | Multiple Choice | a. is endothermic., b. is exothermic., c. absorbs energy., d. two of the above | b |
13,991 | NDQ_015859 | chemical reactions and energy | A constant input of energy is needed in | null | null | Multiple Choice | a. exothermic reactions., b. endothermic reactions., c. all chemical reactions., d. none of the above | b |
13,992 | NDQ_015860 | chemical reactions and energy | You can increase the rate of a chemical reaction by | null | null | Multiple Choice | a. increasing the temperature of reactants., b. decreasing the surface area of reactants., c. decreasing the concentration of reactants., d. all of the above | a |
13,993 | NDQ_015861 | chemical reactions and energy | According to the law of conservation of energy, energy | null | null | Multiple Choice | a. cannot be created., b. cannot be destroyed., c. cannot change form., d. two of the above | d |
13,994 | NDQ_015862 | chemical reactions and energy | Factors that affect reaction rates include | null | null | Multiple Choice | a. temperature., b. concentration., c. surface area., d. all of the above | d |
13,995 | NDQ_015863 | chemical reactions and energy | A catalyst | null | null | Multiple Choice | a. can catalyze just one chemical reaction., b. is always changed in a chemical reaction., c. becomes a product in a chemical reaction., d. helps reactants come together in a chemical reaction. | d |
13,996 | NDQ_015865 | chemical reactions and energy | Crushing a solid reactant into a powder will | null | null | Multiple Choice | a. decrease the reactants surface area., b. increase the rate of the reaction., c. decrease the concentration of products., d. increase the temperature of reactants. | b |
13,997 | NDQ_015866 | chemical reactions and energy | Which statement about catalysts is true? | null | null | Multiple Choice | a. They change the rate of chemical reactions., b. They are reactants in chemical reactions., c. They are used up in chemical reactions., d. two of the above | a |
13,998 | NDQ_015868 | chemical reactions and energy | energy stored in chemical bonds | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | g |
13,999 | NDQ_015871 | chemical reactions and energy | substance that speeds up chemical reactions | null | null | Multiple Choice | a. activation energy, b. catalyst, c. concentration, d. endothermic, e. exothermic, f. reaction rate, g. chemical energy | b |
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