Unit 2: Investigating Chemical Reactions

Front

What do coefficients in a chemical formula represent?

Back

Coefficients represent how many molecules of a substance are present.

Front

In the chemical formula NH₃, how many hydrogen atoms are present?

Back

There are 3 hydrogen atoms in NH₃.

Front

What are the products of the reaction NH₃ ---> N₂ + H₂?

Back

The products are N₂ and H₂.

Front

For the chemical formula 3Fe(NO₃)₃, how many atoms of each element are present?

Back

Fe = 3, N = 9, O = 27.

Front

How many total atoms are in H₂SO₄?

Back

There are 7 total atoms in H₂SO₄.

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.

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 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 the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of an element in a molecule.