Chemistry Quiz 1

Round the number 0.0045678 to three significant figures.

• 0.00456

• 0.00457

• 0.0046

• 0.004568

• 345

• 3450

• 34,500

• 345,000

• 0.2

• 5.0

• 20

• 12500

Which of the following is a homogeneous mixture?

• Sand and iron filings

• Salt water

• Salad

• Granite

How many significant figures are in the measurement 0.02030?

• 2

• 3

• 4

• 5

Convert 0.00082 to scientific notation.

A sample is made up of two elements chemically combined in a fixed ratio. How should this sample be classified?

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

Tags

NGSS.MS-PS1-1

Which of the following best describes the difference between a compound and a mixture?

• Compounds can be separated by physical means, mixtures cannot.

• Mixtures have a fixed composition, compounds do not.

• Compounds are chemically combined, mixtures are physically combined.

• Mixtures are made of only one type of atom, compounds are not.

What is the best classification of this substance?

• An element

• A compound

• A mixture of 2 elements

• A mixture of 2 compounds

Tags

NGSS.MS-PS1-1

Is this a pure substance?

• Yes

• No

Tags

NGSS.MS-PS1-1