8/6 - PreAssessment - Classifying Matter

What is a pure substance?

• 1. A substance with unique chemical and physical properties that forms when two or more elements are chemically bonded during a chemical reaction

• 1. A single substance, either an element or a compound, with definite composition and properties

• 1. A substance that is composed of only one type of atom throughout

• 1. A combination of two or more substances that do not chemically combine and can be separated

Elements and compounds both have definite composition and properties. What is the difference between an element and a compound?

• 1. An element is only composed of one type of atom, and a compound is composed of more than one type of atom.

• 1. A compound is only composed of one type of atom, and an element is composed of more than one type of atom.

• 1. An element is made of more than one atom that is not chemically combined, and a compound is made of only one type of atom.

• 1. A compound is made of more than one atom that is not chemically combined, and an element is made of only one type of atom.

A gold bar is shown in the image below. What type of matter is gold?

• 1. Heterogeneous mixture

• 1. Homogeneous mixture

• 1. Compound

• 1. Element

The image shows a bottle of salad dressing. What type of matter is the salad dressing?

• 1. Heterogeneous mixture

• 1. Homogeneous mixture

• 1. Compound

• 1. Element

Which of the following images shows a homogeneous mixture?

• 
• 
• 
• 

What kind of change forms a compound?

• Chemical

• Physical

• Nuclear

• Mixture

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following can be physically separated? (more than one answer)

• compound

• element

• heterogeneous mixture

• homogeneous mixture

Select ALL the properties of METALS.

• high conductivity

• melt at high temperatures

• brittle

• semiconductor

• insulator

Tags

NGSS.MS-PS3-3

Select ALL the properties of NONMETALS.

• high conductivity

• melt at high temperatures

• brittle

• semiconductor

• insulator

Select ALL the properties of METALLOIDS.

• high conductivity

• melt at high temperatures

• brittle

• semiconductor

• insulator