Unit 3 Part 2 Review

Front

What is the little number after an element in a chemical equation called?

Back

Subscript

Front

What is the theoretical yield of a reaction if 75.0g P4 produces 110g PCl3?

Back

33%

Front

What law governs the balancing of chemical equations?

Back

Law of Conservation of Matter/Mass

Front

For the balanced reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; what is the ratio of moles of MgO to moles of Fe?

Back

3 mol MgO / 2 mol Fe

Front

In the reaction 2H2 + O2 → 2H2O, how many moles of oxygen are consumed if 8 moles H2 are used?

Back

4

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate the number of molecules or moles of that substance.

Front

Define 'mole' in chemistry.

Back

A mole is a unit of measurement used to express amounts of a chemical substance, equivalent to 6.022 x 10^23 particles.

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the same number of each type of atom appears on both sides of the equation, reflecting the conservation of mass.

Front

What does the term 'percent yield' refer to in a chemical reaction?

Back

The ratio of the actual yield to the theoretical yield, expressed as a percentage.

Front

What is the difference between a reactant and a product in a chemical reaction?

Back

Reactants are substances that start a chemical reaction, while products are substances formed as a result of the reaction.