Counting Atoms Flashcard

Front

How many Magnesium atoms are in 10MgCl₂?

Back

10

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change

Front

How many Oxygen atoms are in H₂O?

Back

1

Front

The number of sodium in Na₂CO₃?

Back

2

Front

A copper penny turning greenish after a few years is an example of ...

Back

Chemical Change

Front

What is the definition of a chemical change?

Back

A process where substances combine or break apart to form new substances.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

How many Chlorine atoms are in MgCl₂?

Back

2

Front

What is the formula for calculating the number of atoms in a compound?

Back

Count the subscripts in the chemical formula.

Front

What is the significance of subscripts in a chemical formula?

Back

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