G8 PhySci 5.3.1 Chemical Equations Review

1.A teacher wrote the following part of a chemical equation involving water (H2O) and carbon dioxide (CO2): H2O + CO2 → ? What is the most likely result of the chemical reaction represented by this equation?

• H2CO3

• HNO3

• H2Ca3

• NaCl

2.The chemical equation for a chemical reaction begins as shown. AgNO3 + NaBr → ? What is the most likely result of the chemical reaction represented by this equation?

• AgBr + NaNO3

• AgBr + NO3

• NaBr + NaNO3

• NaBr + CO3

3.The chemical equation for a chemical reaction begins as shown: NaOH + HCl → What are the most likely products of the chemical reaction represented by this equation?

• NaO + Cl2

• NaCl + H2O

• Na + H2O

• NaH + CO

4.Sodium (Na) and water (H2O) undergo a chemical reaction that produces sodium hydroxide (NaOH) and hydrogen gas (H2). Which equation represents this chemical reaction?

• 2Na + 2H2O → 2NaOH + H2

• 2Na + H2 → 2NaOH + 2H2O

• H2 + 2H2O → 2Na + 2NaOH

• 2Na + 2NaOH → 2H2O + H2

5.Zinc (Zn) combines with hydrogen chloride (HCl) to form hydrogen gas (H2) and zinc chloride (ZnCl2). Which equation represents this chemical reaction?

• Zn → H2 + ZnCl2 + 2HCl

• ZnCl2 + Zn → H2 + 2HCl

• 2HCl → H2 + Zn + ZnCl2

• Zn + 2HCl → H2 + ZnCl2

6.When methane (CH4) combines with oxygen (O2), carbon dioxide (CO2) and water vapor (H2O) are produced. Which equation represents this chemical reaction?

• CH4 + 2H2O → 2O2 + CO2

• CH4 + 2O2 → CO2 + 2H2O

• CO2 + 2H2O → 2O2 + CH4

• CO2 + CH4 → 2H2O + 2O2

7.This chemical equation represents a chemical reaction. 2HNO3 + Na2SO3 → 2NaNO3 + H2O + SO2 Which chemical is a reactant in the reaction?

• SO2

• H2O

• NaNO3

• Na2SO3

8.This chemical equation represents a chemical reaction. CaCO3 + 2HCl → CO2 + CaCl2 + H2O Which chemical is a reactant in this reaction?

• CaCl2

• H2O

• CO2

• HCl

9.This chemical equation represents a chemical reaction. CaSO3 + 2HNO3 → SO2 + Ca(NO3)2 + H2O Which chemical is a reactant in this reaction?

• Ca(NO3)2

• SO2

• H2O

• CaSO3

10.Which two substances are reactants in the following chemical equation? CO + H2O → CO2 + H2

• H2

• CO

• CO2

• H2O