Counting Atoms Practice

Front

What is an element in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms that have the same number of protons.

Front

How many elements are in the compound C2H8O?

Back

3 (Carbon, Hydrogen, and Oxygen)

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element that are present in a molecule.

Front

How many Chlorine (Cl) atoms are in MgCl2?

Back

2

Front

What is a coefficient in a chemical formula?

Back

A coefficient is a number placed in front of a chemical formula that indicates how many molecules of that substance are present.

Front

How do coefficients affect the entire chemical formula?

Back

Coefficients multiply all the atoms in the formula that follow them.

Front

What are reactants in a chemical equation?

Back

Reactants are the starting substances that undergo a chemical change in a reaction.

Front

What are products in a chemical equation?

Back

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

Front

How many Nitrogen atoms are in H3C2ON5?

Back

5

Front

What is the purpose of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, following the law of conservation of mass.