2024 Chem 1 Semester 1 review

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together. Example: Carbon dioxide (CO2) is a compound.

Front

What is scientific notation?

Back

A way of expressing numbers that are too large or too small to be conveniently written in decimal form. Example: 0.00061 = 6.1 x 10^-4.

Front

What is mass number?

Back

The total number of protons and neutrons in an atom's nucleus.

Front

Which particles are found in the nucleus of an atom?

Back

Protons and neutrons.

Front

Who developed the plum pudding model of the atom?

Back

J.J. Thomson.

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.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded. Example: Brass is a mixture of copper and zinc.

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.