PHYSICAL SCIENCE CHEMISTRY REVIEW #1

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds, such as gold or water.

Front

How do you find the average number of neutrons in an atom?

Back

To find the average number of neutrons in an atom, subtract the atomic number from the mass number.

Front

What are the three main parts of an atom?

Back

The three main parts of an atom are protons, neutrons, and electrons.

Front

What state of matter has a definite volume and an indefinite shape?

Back

Liquids have a definite volume but take the shape of their container.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and different parts can be seen, such as gumballs in a gumball machine.

Front

What is the atomic number of an element?

Back

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

Front

What is the mass number of an atom?

Back

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

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond together, while a mixture is a combination of two or more substances that retain their individual properties.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is salt water, where the salt is evenly distributed throughout the water.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.