UNIT 2 Assessment ONLY ONE ATTEMPT

Front

How many atoms of Hydrogen are there in the figure?

Back

24

Front

The compounds that go into a reaction are called __________, while those that come out are called ________.

Back

reactants/products

Front

Could any of the solids be the same substance and why?

Back

Solids 2 and 3 could be the same substance. Even though they do not have the same mass, they have the same melting point and color.

Front

The only way to know for sure if a chemical reaction took place is to test the properties of the new substance. True or False?

Back

False

Front

When balancing a chemical equation, you are allowed to change the coefficients. True or False?

Back

True

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring that the number of atoms for each element is the same on both sides of the equation.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.