Counting Atoms

Front

What is the number of atoms of Hydrogen in H₂O?

Back

2

Front

What do coefficients in chemical formulas do?

Back

Multiply EVERYTHING!

Front

How many different elements are present in H₂COCH₂?

Back

3

Front

In H₂SO₄, how many atoms of each element are there?

Back

H = 2, S = 1, O = 4

Front

In C₃H₅(NO₃)₃, how many atoms of Carbon, Hydrogen, Nitrogen, and Oxygen are there?

Back

C = 3, H = 5, N = 3, O = 9

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

What is the total number of atoms in H₂O?

Back

3 (2 Hydrogen + 1 Oxygen)

Front

How do you determine the number of Oxygen atoms in a compound like Ca(OH)₂?

Back

Count the subscript: there are 2 Oxygen atoms.

Front

What is the significance of parentheses in chemical formulas?

Back

They indicate that the enclosed atoms are grouped together and can be multiplied by a coefficient.

Front

How many total atoms are in the molecule C₆H₁₂O₆?

Back

24 (6 Carbon + 12 Hydrogen + 6 Oxygen)