FER: Chemical Reactions

Front

What is a coefficient in a chemical equation?

Back

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

Front

What is the balanced equation for the reaction of hydrogen and sulfur to form hydrogen sulfide?

Back

The balanced equation is 1 H₂ + 1 S → 1 H₂S.

Front

How do you balance the reaction PCl₅ + H₂O → HCl + H₃PO₄?

Back

The balanced equation is 4 PCl₅ + 5 H₂O → 12 HCl + 1 H₃PO₄.

Front

How many total atoms are in H₂SO₄?

Back

There are 7 total atoms in H₂SO₄ (2 H, 1 S, 4 O).

Front

What type of reaction is represented by A + BC = B + AC?

Back

This is a Single Replacement reaction.

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

What is the purpose of balancing chemical equations?

Back

The purpose is to obey the law of conservation of mass, ensuring that matter is neither created nor destroyed in a chemical reaction.

Front

What does the subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of an element in a molecule.

Front

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

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result of the 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.