COUNTING ATOMS

Front

What do coefficients in chemical formulas do?

Back

Coefficients multiply EVERYTHING in the chemical formula.

Front

In the formula 4CF2Cl2, how many atoms of each element are there?

Back

C = 4, F = 8, Cl = 8.

Front

In the formula C3H5(NO3)3, how many atoms of each element are there?

Back

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

Front

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

Back

H = 2, S = 1, O = 4.

Front

How many atoms of Hydrogen are in H2O?

Back

There are 2 atoms of Hydrogen in H2O.

Front

What is the total number of atoms in the molecule C2H6?

Back

There are 8 total atoms (2 Carbon and 6 Hydrogen).

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in the molecule.

Front

How do you determine the number of oxygen atoms in Ca(NO3)2?

Back

There are 6 oxygen atoms (2 from the Ca and 4 from the 2 NO3 groups).

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the enclosed atoms are multiplied by the subscript outside.

Front

In the formula 3H2O, how many total hydrogen atoms are there?

Back

There are 6 hydrogen atoms (3 x 2 = 6).