Lab: Rate of Chemical Reactions — Unit test Answers

25 verified answers4 views
21
Free Preview

When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?

A
a chemical change, because a precipitate is being formed
B
a chemical change, because a gas is being formed
C
a non-chemical change, because a precipitate is being formed
D
a non-chemical change, because a gas is being formed
22
Free Preview

Franklin was performing an experiment by combining hydrochloric acid and sodium hydroxide. He measured the mass of his reactant materials to be 35g. The reaction resulted in the production of salt and water. He reported that his products weighed 32g.Which best describes the results of Franklin’s experiment?

A
No error occurred, some of the products are always lost as heat.
B
An error occurred, the mass of the reactants should equal the mass of the products.
C
An error occurred, the products should weigh more than the reactants.
D
No error occurred, water is not weighed when determining the weight of the products.
24

Liquid 1 reacts with Liquid 2, producing a solid and a gas. Using this scenario, which supports the law of conservation of mass?

A
mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas
B
mass of Liquid 1 – mass of solid = mass of Liquid 2 – mass of gas
C
mass of Liquid 1 – mass of Liquid 2 = mass of solid + mass of gas
D
mass of Liquid 1 + mass of Liquid 2 = mass of solid + mass of gas

Did you find these answers helpful?