8th Grade Unit 1 Vocab

What is a compound?

• A) A single element in its pure form

• B) A mixture of different substances

• C) A substance formed when two or more different elements chemically bond together

• D) A solution of acids and bases

An element is defined as:

• A) A substance that can be broken down into simpler substances

• B) A mixture of different elements

• C) A pure substance that cannot be broken down by chemical means

• D) A solution with a pH of 7

Which of the following describes a heterogeneous mixture?

• A) A mixture with uniform composition

• B) A mixture where components are not uniformly distributed

• C) A single phase substance

• D) A pure element

A homogeneous mixture is characterized by:

• A) Distinct, separate phases

• B) Uniform distribution of components

• C) Varying compositions

• D) Fixed proportions of elements

Matter is:

• A) Anything that can be seen

• B) Anything that has mass and occupies space

• C) Only solid substances

• D) A specific type of element

Adhesion refers to:

• A) The attraction between similar molecules

• B) The tendency of different substances to cling together

• C) The surface tension of liquids

• D) The pressure exerted by a gas

Cohesion is:

• A) The force that holds liquids in a container

• B) The attraction between molecules of the same substance

• C) The separation of mixtures

• D) The process of dissolving

Surface tension is:

• A) The pressure exerted by a gas

• B) The cohesive force at the surface of a liquid

An acid is a substance that:

• Has a pH greater than 7

• Is neutral in nature

A base is defined as:

• A substance that donates protons

• A substance that has a pH of 7

• A mixture of acids and bases