Balancing and Reaction Types

Front

What is the balanced equation for the reaction of magnesium with hydrochloric acid?

Back

Mg + 2 HCl → MgCl2 + H2

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A subscript is a small number written after an element symbol that indicates the number of atoms of that element in a molecule.

Front

Identify the type of reaction: ZnCl2 + Mg → Zn + MgCl2

Back

Single Replacement

Front

What type of reaction involves two reactants combining to form one product?

Back

Synthesis reaction.

Front

What is the law of conservation of mass?

Back

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

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where one reactant breaks down into two or more products.

Front

What is a combustion reaction?

Back

A combustion reaction is a chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat.

Front

What is a double replacement reaction?

Back

A double replacement reaction is a type of reaction where two compounds exchange ions to form two new compounds.

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring that the number of atoms of each element is the same on both sides of the equation.