Counting Atoms

Front

What is the definition of a coefficient in a chemical formula?

Back

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

Tags

NGSS.MS-PS1-5

Front

How many atoms of Magnesium are in the compound 10MgCl₂?

Back

10

Tags

NGSS.MS-PS1-1

Front

What is the term for the small number written after an element symbol in a chemical formula?

Back

Subscript

Front

In the compound H₂SO₄, how many oxygen atoms are present?

Back

4

Tags

NGSS.MS-PS1-1

Front

What is the process called when substances change to produce different substances?

Back

Chemical Reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

How many different elements are in the chemical formula NaHCO₃?

Back

4

Tags

NGSS.MS-PS1-1

Front

What is the total number of hydrogen atoms in the compound H₃PO₄?

Back

3

Tags

NGSS.MS-PS1-1

Front

In the compound H₂O, how many hydrogen atoms are there compared to oxygen atoms?

Back

2 hydrogen atoms for every 1 oxygen atom.

Tags

NGSS.MS-PS1-1

Front

What does the chemical formula H₂SO₄ represent?

Back

Sulfuric acid, which contains 2 hydrogen, 1 sulfur, and 4 oxygen atoms.

Tags

NGSS.MS-PS1-1

Front

What is the significance of the number in front of a chemical formula, such as in 3H₂O?

Back

It indicates that there are 3 molecules of water.