Unit 4/5 Test Review

Which equation is a balanced chemical equation?

• 2NaOH + CaBr₂ —> Ca(OH)₂ + NaBr

• NO + Cl2 —> NOCl

• CaCO₃ —> CaO + 2CO₂

• 2AlCl₃ + 3Mg —> 3MgCl₂ + 2Al

Which equation is correctly balanced for hydrogen and oxygen reacting to form water?

• H₂ + O₂ —> H₂O

• 2H₂ + O₂ —> 2H₂O

• 4H + O₂ —> 2H₂O

• H₂ + O —> H₂O

What are the names of products in the chemical equation shown here?

HCl + NaHCO₃ —> NaCl + CO₂ + H₂O

• Hydrochloric acid and sodium bicarbonate

• Sodium chloride, carbon dioxide, and water

• Hydrogen chloride and sodium bicarbonate

• Sodium chloride, carbon monoxide, and dihydrogen monoxide

The Law of Conservation of Mass states that the mass on each side of a chemical equation should be the same.

• TRUE

• FALSE

Which of the following is the balanced chemical equation that represents the chemical reaction of potassium and oxygen to produce potassium oxide?

• K + O —> KO

• 4K + O₂ —> 2K₂O

• K + O₂ —> KO₂

• 2K + 2O —> K₂O₂

Which chemical equation is correctly balanced?

• Ca(NO₃)₂ + Na₂CO₃ —> CaCO₃ + NaNO₃

• Ca(NO₃)₂ + 2Na₂CO₃ —> 2CaCO₃ + 2NaNO₃

• 2Ca(NO₃)₂ + Na₂CO₃ —> CaCO₃ + 4NaNO₃

• Ca(NO₃)₂ + Na₂CO₃ —> CaCO₃ + 2NaNO₃

if there are 24 g of a substance on the reactants side of a reaction, how many grams should be in the products?

• 2

• 12

• 24

• 48

Which of the following is/are products in combustion reactions?

• Heat and light

• Carbon dioxide and water

• Both answers are correction

• Neither answer is correct

Reactants are located on the ___ side of the equation

• Left

• Right

Products are located on the ____ side of the reaction

• Left

• Right