Chemistry Semester Exam

Front

What is the chemical formula for water?

Back

H₂O

Front

What is an example of a chemical change?

Back

Browning meat

Front

What are the smallest particles into which an element may be broken down without changing the identity of the element?

Back

Atoms

Front

What isotope is the atomic mass unit defined relative to?

Back

Carbon-12

Front

What is Avogadro’s number?

Back

The number of particles in one mole of a substance, approximately 6.022 x 10²³.

Front

What is the definition of a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

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 law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of a substance, defined as containing exactly 6.022 x 10²³ particles.

Front

What is the definition of an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.