1. A release of energy is a sign that. 5. The substance that is formed in a chemical reaction is called the. A. a physical change gust occurred

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1 1. A release of energy is a sign that A. a physical change gust occurred B. a chemical change is taking place 5. The substance that is formed in a chemical reaction is called the A. reactant B. product 2. Chemical energy is energy that is A. stored in the form of chemical bonds. B. added to a reaction in the form of heat. 6. Which of the following stores chemical energy? A. The bonds of a molecule B. the nucleus of an atom 3. Which of following factors will not speed up a chemical reaction. A. higher pressure B. smaller surface area 7. Which of the following occurs in an endothermic reaction but not in an exothermic reaction? A. Chemical bonds are broken B. energy is absorbed. 4. Which of these is not a sign of a chemical reaction? 8. A type of reaction that produces an increase in temperature is A. The material dissolves B. a gas is given off. A. exothermic B. endothermic

2 9. An example of an endothermic reaction is A. an exploding firecracker B. photosynthesis by a plant 13. Catalysts that slow reactions are called A. balanced B. inhibitors 10. A reaction in which the products contain more chemical energy than the reactants is A. endothermic B. exothermic 14. A slow reaction is likely to occur when the reactants have temperatures. A. low B. high 11. Which of these represents the release of chemical energy? A. a toy car running down a ramp B. burning charcoal in a grill 15. Which is not true of catalysts? A. They can be reused B. They are used up in the reaction 12. At higher temperatures, food cooks faster because particles of food A. collide more often B. increase in number 16. Which is not true of enzymes? A. They are inefficient. B. They are catalysts.

3 17. Which of these are not likely to speed up the rate of a reaction? A. increasing pressure B. decreasing the surface area 21. Large, bulky molecules react more slowly than small ones because they have less opportunity to A. become heated B. collide with other molecules. 18. A substance that undergoes a change in a chemical reaction is A. a reactant B. A product 22. What happens in a chemical reaction? A. Atoms are rearranged B. Atoms are created. 19. In an exothermic reaction, energy is transferred from A. one reactant to another B. the reactants to the surroundings. 23. Which statement about endothermic reactions is correct? A. Energy is transferred from the reactants to the surroundings. B. Energy is transferred from the surrounding to the reactants. 20. The energy source in photosynthesis is A. light energy B. chemical energy 24. Because many substances dissolve in water, water is referred to as the A. universal solvent B. universal solute

4 25. Which will not dissolve in water? A. Sugar B. petroleum 29. Water can dissolve charged particles because A. it is an ionic compound. B. its atoms have partial charges. 26. What type of bonding occurs between two water molecules? A. hydrogen bonding B. ionic bonding 30. In the equation E = mc 2, c stands for A. the speed of light. B. the size of the particle 27. Compounds that do not dissolve in water are usually 31. What holds protons and neutrons together in a nucleus? A. polar B. nonpolar A. like charges repelling B. strong nuclear force 28. Water is referred to as the universal solvent because A. many different substances dissolve in water. B. it is found throughout the universe. 32. In nuclear fission, small losses in mass produce amounts of energy. A. large B. small

5 33. Fusion produces nuclei. A. smaller B. larger 37. Which of the following is a disadvantage of nuclear energy as a power source? A. Nuclear waste must be safely stored. B. The fuel source is very limited 34. Which of the following is not a source of natural background radiation? 38. The nuclear power used for electricity is produced by A. x-ray machines B. the sun A. fission B. fusion 35. A person s exposure to radiation can be affected by A. where he/she lives B. his/her height 39. Whether or not a person develops radiation sickness depends on the of the exposure to radiation. A. amount B. temperature 36. Which of the following is an advantage of nuclear energy as a power source? A. Nuclear energy does not produce air pollution. B. Waste can be stored anywhere. 40. Radioactive materials have unstable A. nuclei B. electrons

6 41. The process of nuclear change in an atom of radioactive material is called A. isotopes B. radioactive decay 45. Which of the following is not a type of nuclear radiation? A. beta particles B. X rays 42. Fusion occurs when nuclei A. combine B. split 46. Nuclear radiation refers to charged particles or energy emitted by an unstable A. nucleus B. isotope 43. A fission chain reaction can be slowed by using materials that will 47. The process of the production of lighter nuclei from heavier nuclei is called A. convert some of the neutrons to protons B. absorb some of the neutrons. A. fusion B. fission 44. Background radiation can come from 48. The opposite of fusion is called A. the sun, plants, and water. B. none of the above. A. fission B. alpha decay

7 49. Nuclear radiation can help detect diseases with the use of A. alpha particles B. radioactive tracers 50. The use of nuclear reactors to generate electricity is A. found in dozens of countries B. found only in the United States

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