Counting Atoms & Balancing Equations

Front

What is the law of conservation of mass in a chemical reaction?

Back

The law 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

What are coefficients in a chemical equation?

Back

Coefficients are the numbers placed before the compounds in a chemical equation to indicate the number of molecules or moles of each substance involved in the reaction.

Front

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

Back

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

Front

What is the balanced equation for the decomposition of potassium nitrate (KNO₃)?

Back

2 KNO₃ --> 2 KNO₂ + O₂.

Front

How many oxygen atoms are present in the compound H₃C₄ON₅?

Back

There are 5 oxygen atoms in the compound H₃C₄ON₅.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it ensures that the same number of each type of atom is present on both sides of the equation, reflecting the conservation of mass.

Front

How many sodium (Na) atoms are in the balanced equation 2 NaClO₃ --> 2 NaCl + 3 O₂?

Back

There are 2 sodium (Na) atoms in the balanced equation.

Front

What is the total number of nitrogen atoms in Al₂(NO₄)₃?

Back

There are 6 nitrogen atoms in Al₂(NO₄)₃.

Front

What is the process of balancing a chemical equation?

Back

The process of balancing a chemical equation involves adjusting the coefficients of the reactants and products to ensure that the number of atoms of each element is equal on both sides of the equation.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript in a chemical formula indicates the number of atoms of the element that are present in one molecule of the compound.