Chem Practice Quiz 2 2/7

An element is defined as:

• A substance with a uniform and definite composition.

• The simplest form of matter that cannot be broken down by chemical means.

• Two or more different elements chemically bonded in a fixed ratio.

• A physical blend of two or more substances.

Which of the following is an example of a compound?

• Oxygen (O)

• Air

• Sodium Chloride (NaCl)

• Brass (a mixture of copper and zinc)

Tags

NGSS.MS-PS1-1

Observing the color of a substance is an example of identifying a:

• Chemical property

• Physical property

• Extensive property

• Reaction rate

Which state of matter is characterized by particles tightly packed and vibrating in place?

• Solid

• Liquid

• Gas

• Solution

Tags

NGSS.MS-PS1-4

The measurement 20.30 mL has how many significant figures?

• 2

• 3

• 4

• 5

When 15.75 g is added to 2.1 g, the result, reported with the correct number of significant figures (based on decimal places), is:

• 17.85 g

• 17.9 g

• 18 g

• 17.8 g

• 2.0×10^2 m/s
• 2×10^2 m/s

• 2.0000×10^2 m/s

• 2.0×10^-2 m/s

Tags

NGSS.MS-PS3-1

Convert the number 602,200,000 to scientific notation.

A measurement that is very close to the true or accepted value is considered to be:

• Precise

• Accurate

• Significant

• Reproducible

Which subatomic particle is found in the nucleus and has no charge?

• Proton

• Electron

• Neutron

• Photon

Tags

NGSS.HS-PS1-8