Building Skills 3 pp. 30-31 Practice

Problems

For each formula, name the elements present and give the number of atoms

of each element.

BaF2

ANSWER!

•Barium (Ba): 1•Fluorine (F): 2

For the following equation give an atom inventory:

N2 + 3 H2 2NH3

Reactants N-2 H-6

ProductsN-2 H-6

For each formula, name the elements present and give

the number of atoms of each element.

H2O2

•Hydrogen (H): 2•Oxygen (O): 2

For the following equation give a molecule

inventory:

N2 + 3H2 2NH3

One nitrogen molecule & three molecules of hydrogen yields two molecules of ammonia (NH3).

For the following equation give an atom

inventory:

O2 + 2H2 2 H2O

Reactants

O-2 H-4

Products

O-2 H-4

For each formula, name the elements present and give the number of atoms

of each element.

CaSO4

- Calcium (Ca): 1- Sulfur (S): 1- Oxygen (O): 4

What are subscripts?

The lower case numbers in a formula (the

number 2 in H20)

For each formula, name the elements present and give

the number of atoms of each element.

Al2SO4

-Aluminum (Al):2-Sulfur (S):1Oxygen (O):4

For the following equation list the

reactants:

O2 + 2 H2 2 H2O

O2

&

H2

For each formula, name the elements present and give

the number of atoms of each element.

NH4NO3

•Nitrogen (N):2•Hydrogen (H):4•Oxygen (O):3

What is a coefficent?

The large number out in front of a formula (like 2 in front of the 2 H2O).

For each formula, name the elements

present and give the number of atoms of

each element.

Li2CO3

-Lithium (Li): 2-Carbon (C): 1-Oxygen (O): 3

For the following equation give a molecule inventory:

CH4 +4O2 CO2+ 2H2O

One methane (CH4) and four oxygen molecules yield one carbon dioxide and two water molecules.

For each formula, name the elements present and give

the number of atoms of each element.

(NH4)3PO3

-Nitrogen (N): 3-Hydrogen (H): 12-Phosphorus (P): 1-Oxygen (O): 3

List the reactants in the following equation:

N2 + 3 H2 2 NH3

N2

& H2

4NH3+ 7O2 4NO2 + 6H2OCopy this equation.

1. Underline the coefficients.2. Circle the molecules.

Coefficients:4NH3+ 7O24NO2 +6H2O

Molecules:

NH3 NO2

O2 H20

For each formula, name the elements

present and give the number of atoms of

each element.

HC2H3O2

-Hydrogen (H): 4-Carbon (C): 2-Oxygen (O): 2

List the products in the following equation:

CH4 + 4O2 CO2 + H2O

For each formula, name the elements present and give

the number of atoms of each element.

Na2O

ANSWER!

•Sodium (Na): 2•Oxygen (O): 1

For each formula, name the elements present and give

the number of atoms of each element.

Al2O3

ANSWER!

•Aluminum (Al): 2•Oxygen (O): 3