Chemistry final Review 24'

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or gas production.

Front

What is the chemical formula for aluminum sulfate?

Back

Al₂(SO₄)₃

Front

How many protons does a carbon-14 atom have?

Back

6

Front

What is the molar mass of aluminum (Al)?

Back

Approximately 27 g/mol.

Front

What is the relationship between moles and grams in chemistry?

Back

Moles are a measure of the amount of substance, while grams measure mass. The number of grams can be calculated using the formula: grams = moles × molar mass.

Front

What gas is produced when zinc reacts with hydrochloric acid?

Back

Hydrogen gas (H₂) is produced.

Front

What is the significance of the 'pop' sound when hydrogen gas is ignited?

Back

The 'pop' sound indicates the presence of hydrogen gas, which is flammable and produces a small explosion when ignited.

Front

What is the process of balancing a chemical equation?

Back

Balancing a chemical equation involves ensuring that the number of atoms of each element is the same on both sides of the equation, reflecting the conservation of mass.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the formula to calculate the number of moles from grams?

Back

Moles = grams / molar mass.