1. What is another term for a solid that forms in an aqueous reaction?

2. Answer: Precipitate

3. Which of the products in this reaction is a precipitate? MgCl 2 (aq) + K 2 SO 4 (aq) → MgSO 4 (s) + 2 KCl (aq)

4. Which of the products in this reaction is a precipitate? MgCl 2 (aq) + K 2 SO 4 (aq) → MgSO 4 (s) + 2 KCl (aq) Answer: MgSO4(s)

5. What types of reactions are these? A)MgO + 2 Na  Na 2 O + Mg B)2 Na + Cl 2  2 NaCl C)CH 4 + 2 O 2  CO 2 + 2 H 2 O D)MgI 2 + 2 NaCl  MgCl 2 + 2 NaI E)CO 2  C + O 2

6. What types of reactions are these? A)MgO + 2 Na  Na 2 O + Mg B)2 Na + Cl 2  2 NaCl C)CH 4 + 2 O 2  CO 2 + 2 H 2 O D)MgI 2 + 2 NaCl  MgCl 2 + 2 NaI E)CO 2  C + O 2 Answer: A)Single Replacement B) Synthesis C) Combustion D) Double Replacement E) Decomposition

7. List the two products that can be formed in a combustion reaction?

8. Answer: CO 2 and H 2 O

9. Predict the product that will form from this reaction? 2 Na + 2 HCl → ?

10. Predict the product that will form from this reaction? 2 Na + 2 HCl → ? Answer: 2 NaCl + H 2

11. What coefficient will complete this chemical equation? 2 CaF 2 + O 2 → 2 CaO + ? F 2

12. What coefficient will complete this chemical equation? 2 CaF 2 + O 2 → 2 CaO + ? F 2 Answer: 2

13. Give all four coefficients that will complete this equation. __Al + __ H PO → __H + __ AlPO 3 2 4 4

14. Give all four coefficients that will complete this equation. __Al + __ H PO → __H + __ AlPO 3 2 4 4 Answer: 2,2,3,2

15. Assign oxidation numbers to the following compound? K 2 (SO 4 )

16. Assign oxidation numbers to the following compound? K 2 (SO 4 ) Answer: K = +1 S = +6 O = -2

17. What reactant will be oxidized in this reaction? SiO 2 + Ca → CaO + Si

18. What reactant will be oxidized in this reaction? SiO 2 + Ca → CaO + Si Answer: Ca (it gains a positive charge, so it lost electrons)

19. If lithium (Li) was reduced in this reaction, what was the reducing agent? Zn + Li 2 O → Li + ZnO

20. If lithium (Li) was reduced in this reaction, what was the reducing agent? Zn + Li 2 O → Li + ZnO Answer: Zn

21. What does “Oil Rig” stand for?

22. Answer: O = Oxidation I = Is L = Loss R = Reduction I = Is G = Gain

23. What do the following symbols stand for in a chemical reaction? A. (s) B. (g) C. (aq) D. (l)

24. What do the following symbols stand for in a chemical reaction? A. (s) B. (g) C. (aq) D. (l) Answer: A. Solid B. Gas C. Aqueous D. Liquid

25. What are the 4 signs that a chemical reaction has happened?

26. Answer: 1. Color change 2. Formation of a gas 3. Formation of a precipitate (solid) 4. Heat/light produced

27. Matter cannot be ______ or _______.

28. Answer: Created or Destroyed

29. If 15 grams of H 2 reacts with 20 grams of O 2, how many grams of H 2 O will be in the product? 2 H 2 + O 2 → 2 H 2 O

30. If 15 grams of H 2 reacts with 20 grams of O 2, how many grams of H 2 O will be in the product? 2 H 2 + O 2 → 2 H 2 O Answer: 35 grams

31. Which of the following is most likely an oxidation reduction reaction? A)MgO + 2 Na  Na 2 O + Mg B)2 Na + Cl 2  2 NaCl C)MgI 2 + 2 NaCl  MgCl 2 + 2 NaI D)CO 2  C + O 2

32. Which of the following is most likely an oxidation reduction reaction? A)MgO + 2 Na  Na 2 O + Mg B)2 Na + Cl 2  2 NaCl C)MgI 2 + 2 NaCl  MgCl 2 + 2 NaI D)CO 2  C + O 2 Answer: A

33. Which of the following reactions shows this written equation? A) Pb 2 O + Cl → O 2 + Pb 2 Cl B) PbO + Cl 2 → O + PbCl 2 C) PbO + Cl 2 → O 2 + PbCl 2 D) PbO 2 + Cl 2 → O 2 + PbCl Lead (II) oxide and chlorine react to produce oxygen and lead (II) chloride.

34. Which of the following reactions shows this equation written correctly? A) Pb 2 O + Cl → O 2 + Pb 2 Cl B) PbO + Cl 2 → O + PbCl 2 C) PbO + Cl 2 → O 2 + PbCl 2 D) PbO 2 + Cl 2 → O 2 + PbCl Lead (II) oxide and chlorine react to produce oxygen and lead (II) chloride. Answer: C

35. Write the chemical equation based on the word equation. Word Equation: Magnesium bromide reacts with potassium to produce potassium bromide and magnesium.

36. Write the chemical equation based on the word equation. Word Equation: Magnesium bromide reacts with potassium to produce potassium bromide and magnesium. Answer: MgBr 2 + 2 K → 2 KBr + Mg