Final Exam Review

Front

What are significant figures?

Back

Significant figures are the digits in a number that are meaningful in terms of accuracy or precision.

Front

For the reaction 2H₂ (g) + O₂ (g) → 2H₂O (l), how many moles of oxygen gas are needed to produce 63.07g H₂O?

Back

0.875 mol

Front

Convert 273 K to degrees Celsius.

Back

0°C

Front

What is the definition of a neutron?

Back

A neutron is a subatomic particle with no charge found in the nucleus of an atom.

Front

What are coefficients in a chemical equation?

Back

Coefficients are numbers placed before compounds to balance a chemical equation.

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit of measurement that represents 6.022 x 10²³ particles, atoms, or molecules.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the difference between an element and a compound?

Back

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

Front

What is the pH scale used for?

Back

The pH scale measures the acidity or basicity of a solution.