Counting Atoms Flashcard

Front

What do subscripts represent in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

How many carbon (C) atoms are in the formula 2Na₂CO₃?

Back

There are 2 carbon (C) atoms.

Front

Which of the following chemical formulas are the products? CH₄ and 2O₂, 2O₂, CO₂, CO₂ and 2H₂O

Back

The products are CH₄ and 2O₂.

Front

Is rusting a chemical or physical change?

Back

Rusting is a chemical change.

Front

What type of change occurs during an explosion?

Back

An explosion is a chemical change.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the number and type of atoms in a molecule.

Front

What does the coefficient in a chemical equation represent?

Back

The coefficient indicates the number of molecules or moles of a substance.

Front

What is the difference between a chemical change and a physical change?

Back

A chemical change results in the formation of new substances, while a physical change does not.

Front

What is the law of conservation of mass?

Back

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

Front

What does the term 'reactants' refer to in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change.