Integrated Science Ii

INTEGRATED SCIENCE II CHAPTER 7 – CHEMICAL REACTIONS

STUDY GUIDE FOR CHAPTER 7 TEST

Multiple Choice

1. What are reactants? 2. What are products? 3. What does the arrow mean in a chemical equation? 4. What is the law of conservation of mass? 5. Write the equation that accurately represents what happens when nitrogen and hydrogen react to form ammonia (NH3). 6. Write and balance the equation for the synthesis of potassium chloride (KCl) from potassium and chlorine/ 7. Balancing an equation *** 8. omit on test 9. omit on test 10. omit on test 11. omit on test 12. omit on test 13. In a compound, chemical energy is contained in the ______. 14. In terms of bonds, what happens during a chemical reaction? 15. Distinguish between endothermic and exothermic reactions in terms of energy. 16. What is meant by “conservation of energy”? 17. How does temperature affect reaction rate? 18. How does concentration of reactants affect reaction rate? 19. omit on test 20. omit on test

Short Answer

21. How does the law of conservation of mass explain why only a bit of ash is left after burning a large sheet of paper? 22. What is the purpose of balancing a chemical equation? 23. ***determine whether an equation was correctly balanced 24. omit on test 25. What happens during a decomposition reaction? 26. If you know that element “X” will replace element “Y” in a single replacement reaction, what are the products of a single-replacement reaction between element “X” and the compound “Y” hydroxide? 27. What are the products of the double-replacement reaction between the compounds “AB” and “CD”? 28. omit on test 29. Explain why a bologna sandwich will stay fresh longer if it is kept in a refrigerator. Problems

30. Balance an equation. *** 31. Balance an equation. ***

Using Science Skills

32. Look at a diagram and determine how many of each type of atom are present on each side of the equation. ***

33. If the total number of atoms on the left side of the equation equaled the total number of atoms on the right side of the equation, would this necessarily mean that the equation was balanced? EXPLAIN.

34. If there are 4 “X” atoms on the left side of the equation, how many “X” atoms must there be on the right side in order to balance the equation?

35. Balance the equation.***

NOTE: Items 32 through 35 all relate the same figure – an model of an equation.

36. In an exothermic reaction, do the reactants or the products contain more chemical energy?

OPEN RESPONSE QUESTION