Review Packet: Chemical Reactions

Chemistry

Unit: Chemical Reactions

Name: ______date: ______MOD: ______

Review Packet: Chemical Reactions

1. A student working in a lab places some Sodium in an Aluminum sulfate solution and notices pieces of Aluminum drop out of the solution.

a. Determine the reactants: ______

b. Predict the products: ______

c. Write the balanced equation: ______

d. Identify the type of reaction: ______

e. Explain why this type of reaction occurs:(refer to the activity series)

______

2. Determine the type of reactions for the following:

a. CH4 + 2O2 → CO2 + 2H2O: ______

b. 2K + O2 → 2KO: ______

c. 2NaCl → 2Na + Cl2: ______

d. Zn + Pb(NO3)2 → Zn(NO3)2 + Pb: ______

e. ZnSO4 + Pb(NO3)2 → Zn(NO3)2 + PbSO4: ______

3. Look at each drawing and state which type of reaction is pictured:

+ → + ______

4. Read the word equation below and write the chemical equation that best represents the word equation. (This means balanced).

a. Potassium metal reacts with barium chloride to produce barium metal and potassium chloride.

______

b. Water reacts with magnesium metal to produce hydrogen gas and magnesium hydroxide.

______

5. What are the two reactants that all combustion reactions have or use? ______

6. What are the two exact products of combustion reactants? ______

7. List the reactivity of the metals (Pb, Mg, Cu, and K) in order of most reactive to least reactive. (use the set of equations below) ______

· Mg + Pb(NO3)2 → Mg(NO3)2 + Pb

· Pb + Cu(NO3)2 → Cu + Pb(NO3)2

· Mg + KNO3 → NO REACTION

· Mg + Cu(NO3)2 → Cu + Mg(NO3)2

8. What must be true in order for the reaction below to occur? Use the Activity series to help.

2Al + 3ZnCl2 → 2AlCl3 + 3Zn ______

Use the following equation to answer question number 9.

Chlorine + Potassium bromide → Potassium chloride + Bromine

Cl2 + 2KBr → 2KCl + Br2

9. Is the equation above balanced? ______

a. What are the symbol and coefficient for Chlorine? ______

b. What are the symbol and coefficient for Bromine? ______

10. What are the coefficients for each of the reactions below:

a. CH4 + ___ O2 → CO2 + ___ H2O

b. C2H4 + ___O2 → ___CO2 + ___ H2O

11. What are the coefficients for each of the following reactions:

a. ____P + ___ O2 → ____ P2O5

b. N2 + ___ H2 → __ NH3

12. Use the periodic table to determine the most likely charge on an ion of each element.

I = ____, N= ____, O= ____, P= _____, Ca= _____, Na=_____, S=_____

13. A diatomic molecule is composed of ______atoms. List 7 elements which exist as diatomic molecules. ______

14. Write the correct formula that would form between the following pairs of ions:

a. Mg2+ and NO3 1- ______

b. Ba2+ and SO4 2- ______

c. Ba 2+ and PO4 3- ______

d. Ca 2+ and OH 1- ______

Use the Activity Table of Metals given below to answer questions 15, 16, and 17.

Activity Series Table

Lithium (Li)
Sodium (Na)
Aluminum (Al)
Zinc (Zn)
Iron (Fe)
Silver (Ag) /
Decreasing Activity
Metals can only be replaced by metals
above them on the activity series.

15. A strip of silver is added to a solution containing a compound of each metal. Which of the metals would silver replace? ______

16. A strip of aluminum is added to a solution containing a compound of each metal. Which of these metals would aluminum replace? ______

17. A metal is added to a solution containing compounds of sodium and iron. Which metals would replace the iron but not the sodium? ______

18. What is the charge on the ion formed when

a. Sulfur gains 2 electrons ______

b. Phosphorous gains 3 electrons ______

19. How many Oxygen atoms are represented by each formula?

Ca3(PO4)2 ______; Ba(OH)2 ______; Al(NO3)3 ______

20. Determine the complete coefficient and formula for the missing reactant or product for the complete combustion of C2H4?

a. C2H4 + ______→ 2 CO2 + 2 H2O

b. C2H4 + 2O2 → ______+ 2 H2O

c. C2H4 + 2O2 → CO2 + ______