Chemistry Benchmark Review

Front

What is the balanced equation for the reaction of phosphorus and oxygen?

Back

P₄ + 3 O₂ → 2 P₂O₃

Front

What is added to a substance to change it from a solid to a gas?

Back

Energy

Front

What is a chemical change in the process of making pizza?

Back

Baking the dough to form the crust

Front

What is a dependent variable?

Back

A variable that is measured and is not controlled by the experimenter.

Front

How do you calculate density?

Back

Density = Mass / Volume

Front

What is the density of a substance with a mass of 24.5 g and a volume of 10.1 cm³?

Back

2.43 g/cm³

Front

What is the definition of a chemical change?

Back

A process where a substance transforms into a different substance with different properties.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the role of energy in phase changes?

Back

Energy is required to overcome intermolecular forces during phase changes.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.