Unit 6.3-Test Review (Part 1)

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that in a closed system, the total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction.

Front

If the total mass of two reactants is 10 grams, what should be the total mass of the products in a closed system?

Back

10 grams.

Front

In a chemical reaction, if reactant A has a mass of 5g and product C has a mass of 9g, how do you find the mass of reactant B?

Back

Use the conservation of mass principle: Mass of reactant B = Mass of reactants - Mass of product C = 5g + Mass of B - 9g.

Front

What is one indicator that a chemical reaction has occurred?

Back

The creation of new substances.

Front

Which of the following is NOT an indicator of a chemical reaction: color change, gas production, temperature change, or dissolving of one substance in another?

Back

Dissolving of one substance in another.

Front

What is a chemical reaction?

Back

A process in which substances (reactants) undergo a transformation to form new substances (products).

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting materials that undergo a chemical change.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.

Front

How can you tell if a chemical reaction has taken place?

Back

Indicators include color change, gas production, temperature change, and the formation of a precipitate.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the Law of Conservation of Mass is obeyed, meaning the number of atoms for each element is the same on both sides of the equation.