Stoichiometry Pre-test

Front

What is stoichiometry?

Back

Stoichiometry is the calculation of reactants and products in chemical reactions.

Front

What type of equation is needed to conduct stoichiometric calculations?

Back

Balanced chemical equation.

Front

Using the equation Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l), how many moles of iron can be made from 6 moles H2?

Back

4 moles Fe.

Front

What are mole ratios used for in stoichiometry?

Back

Mole ratios are used for conversions and are derived from the coefficients of the balanced chemical equation.

Front

In the reaction 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, what is the mole ratio of ethane to oxygen gas?

Back

2:7.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation.

Front

Why is it important to balance chemical equations?

Back

It ensures the law of conservation of mass is followed, meaning matter is neither created nor destroyed.

Front

What is the mole concept in chemistry?

Back

The mole is a unit that measures the amount of substance, defined as 6.022 x 10^23 particles.

Front

How do you calculate moles from mass?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18.02 g/mol.