8.P.1.4 Review

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown.

Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

• The reactants have a greater mass because some of the mass was converted to heat.

• The reactants have a greater mass because some matter was destroyed by the reaction.

• The mass of the reactants is the same as the mass of the products.

• The products have a greater mass because matter was created during the reaction.

Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?

• A

• B

• C

• D

Which set of coefficients will balance this chemical equation?

• 1,2

• 1,3

• 2,2

• 2,3

How does the concept of conservation of mass apply to chemical reactions?

• The reactants and products have exactly the same atoms.

• The reactants and products have exactly the same molecules.

• The change in the amount of matter is equal to the change in energy.

• The change in the amount of matter is only a small percentage of the total mass.

Which set of coefficients will balance this chemical equation?

• 1,2

• 1,3

• 2,3

• 2,5

A chemical reaction separates water into hydrogen gas and oxygen gas. Which of the following statements is true about the mass of the water and the combined mass of the two gases?

• The mass of the water is greater than the combined mass of the two gases.

• The combined mass of the two gases is much greater than the mass of the water.

• The combined mass of the two gases is the same as the mass of the water.

• The mass of the water is the same as double the combined mass of the two gases.

If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?

• 100g

• 104g

• 105g

• 110g

When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs.

Hydrogen + Oxygen -> Water + Energy

What happens to the total mass of the contents of the test tube?

• Increases

• Decreases

• Remains the same

• Part of the mass is changed to heat energy

Which statement is BEST supported by analyzing this equation?

• CO2 is made from the chemical reaction.

• No new compounds are made from this reaction.

• Oxygen gas is need to make the reaction start.

• The atoms rearrange in the chemical reaction so that C6H12O6, glucose, is made.

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

• A physical change occurred

• Atoms involved in the reaction lost mass.

• Precipitates were created in the new solution.

• Gases were released to the atmosphere.