Ch. 15 Review (Physical Science)

What is a substance?

• A type of matter with a fixed composition

• A substance made up of atoms that are all alike

• A substance made of two or more elements

What are the two main groups of matter that we categorize as substances?

• Heterogenous and homogenous

• Elements and compounds

• Atoms and molecules

What is an element?

• A substance made of two or more types of atoms

• A type of matter with a fixed composition

• A substance made up of atoms that are all alike

How many elements exist in nature?

• 90

• None

• 20

What is a compound?

• A substance made of two or more atoms

• A substance made up of atoms that are all alike

• A type of matter with a fixed composition

Can you separate the elements of a compound using physical means?

• No

• Yes

What is a mixture?

• A substance in which the atoms of two or more elements combined by chemical means

• A substance made of atoms that are all alike

• Matter composed of 2 or more substances that can be separated by physical means

What are the two types of mixtures?

• Homogenous and heterogenous

• Elements and compounds

• Atoms and molecules

What is a heterogenous mixture?

• A mixture made of particles that never settle

• A mixture in which different materials remain distinct

• A mixture made of particles that settle due to gravity

What is a suspension?

• A mixture whose particles remain distinct

• A mixture made of particles that settle due to gravity

•  A mixture made of a liquid and solid particles that settle due to gravity