Midterm Review 2024

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. An example is water (H2O).

Front

What happens to particles in a substance when it is heated?

Back

When a substance is heated, its particles gain energy and move further apart, causing the substance to expand.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as flammability.

Front

What is condensation?

Back

Condensation is the process by which water vapor in the air cools and changes into liquid water, forming droplets.

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 flammability?

Back

Flammability is a chemical property that describes how easily a substance can catch fire and burn.

Front

What is the significance of the atomic number?

Back

The atomic number of an element is the number of protons in its nucleus, 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 of an atom and are involved in chemical bonding.

Front

What is thermal expansion?

Back

Thermal expansion is the increase in volume of a substance as its temperature rises, due to the movement of its particles.