Chemical Reactions Test Study Guide - 2023-24 - CP

Front

What is a balanced chemical equation?

Back

A balanced chemical equation shows the reactants and products of a chemical reaction with equal numbers of each type of atom on both sides, ensuring the law of conservation of mass is followed.

Front

Write the balanced chemical equation for the combustion of butane (C4H10).

Back

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

Front

What is the skeleton equation for a chemical reaction?

Back

A skeleton equation is a chemical equation that shows the reactants and products in their chemical formulas but does not indicate the relative amounts of each substance.

Front

Write the skeleton equation for the reaction of barium oxide with water.

Back

BaO + H2O → Ba(OH)2

Front

What is the principle of conservation of mass in chemical reactions?

Back

The principle of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How do you determine the number of each element in a compound?

Back

To determine the number of each element in a compound, multiply the subscript of each element in the chemical formula by the coefficient in front of the compound.

Front

What is a precipitation reaction?

Back

A precipitation reaction occurs when two solutions are mixed and an insoluble solid (precipitate) forms.

Front

Write the balanced equation for the reaction of silver and sulfur to form silver sulfide.

Back

2Ag + S → Ag2S

Front

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

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

Front

What is the role of coefficients in a balanced chemical equation?

Back

Coefficients indicate the number of molecules or moles of each reactant and product involved in the reaction, ensuring the equation is balanced.