Counting Atoms Interim Review

Front

What is O₂ classified as?

Back

Element

Front

How many Oxygen atoms are in Al₂(SO₄)₃?

Back

12

Front

How many atoms are there TOTAL in H₂SO₄?

Back

7

Front

How many atoms of nitrogen are in 5 N₂O?

Back

10

Front

How many atoms of chlorine are in 4 NaCl?

Back

4

Front

Define an element.

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

Define a compound.

Back

A substance formed when two or more elements are chemically bonded together.

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in one molecule of the compound.

Front

What is the total number of atoms in a molecule of H₂O?

Back

3 (2 Hydrogen + 1 Oxygen)

Front

How do you calculate the total number of atoms in a compound?

Back

Add the number of atoms of each element, multiplied by their respective subscripts.