Building Skills 3 pp Practice Problems

For each formula, name the elements present and give the number of atoms of each element. BaF 2

ANSWER! Barium (Ba): 1 Fluorine (F): 2

For the following equation give an atom inventory: N H 2  2NH 3

Reactants N-2 H-6 Products N-2 H-6

For each formula, name the elements present and give the number of atoms of each element. H 2 O 2

Hydrogen (H): 2 Oxygen (O): 2

For the following equation give a molecule inventory: N 2 + 3H 2  2NH 3

One nitrogen molecule & three molecules of hydrogen yields two molecules of ammonia (NH 3 ).

For the following equation give an atom inventory: O 2 + 2H 2  2 H 2 O

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. CaSO 4

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

What are subscripts?

The lower case numbers in a formula (the number 2 in H 2 0)

For each formula, name the elements present and give the number of atoms of each element. Al 2 SO 4

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

For the following equation list the reactants: O H 2  2 H 2 O

O2&H2O2&H2

For each formula, name the elements present and give the number of atoms of each element. NH 4 NO 3

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 H 2 O).

For each formula, name the elements present and give the number of atoms of each element. Li 2 CO 3

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

For the following equation give a molecule inventory: CH 4 +4O 2  CO 2 + 2H 2 O

One methane (CH 4 ) 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. (NH 4 ) 3 PO 3

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

List the reactants in the following equation: N H 2  2 NH 3

N 2 & H 2

4NH 3 + 7O 2  4NO 2 + 6H 2 O Copy this equation. 1. Underline the coefficients. 2. Circle the molecules.

Coefficients: 4NH 3 + 7O 2  4NO 2 +6H 2 O Molecules: NH 3 NO 2 O 2 H 2 0

For each formula, name the elements present and give the number of atoms of each element. HC 2 H 3 O 2

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

List the products in the following equation: CH 4 + 4O 2  CO 2 + H 2 O

For each formula, name the elements present and give the number of atoms of each element. Na 2 O

ANSWER! Sodium (Na): 2 Oxygen (O): 1

For each formula, name the elements present and give the number of atoms of each element. Al 2 O 3

ANSWER! Aluminum (Al): 2 Oxygen (O): 3