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, following the law of conservation of mass.

Front

What does the arrow (→) in a chemical equation represent?

Back

The arrow represents the direction of the reaction, indicating that reactants are transformed into products.

Front

What are reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change in a reaction, found on the left side of the equation.

Front

What are products in a chemical equation?

Back

Products are the substances formed as a result of a chemical reaction, found on the right side of the equation.

Front

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

Back

The number of atoms of an element in a compound is indicated by the subscript next to the element's symbol in the chemical formula.

Front

What is the purpose of balancing chemical equations?

Back

The purpose is to ensure that the same number of each type of atom is present on both sides of the equation, reflecting the conservation of mass.

Front

What is the coefficient in a chemical equation?

Back

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

Front

How do you balance the equation CH₄ + O₂ → CO₂ + H₂O?

Back

The balanced equation is 1 CH₄ + 2 O₂ → 1 CO₂ + 2 H₂O.

Front

What is the balanced equation for PCl₅ + H₂O → HCl + H₃PO₄?

Back

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

Front

How many aluminum atoms are in the equation 4Al + 3O₂ → 2Al₂O₃?

Back

There are 4 aluminum atoms on the left side and 4 aluminum atoms on the right side.