Select the answer that expresses the result of this calculation with the correct number of significant figures:

32.220 x 32.022

4.68

• 220.46

• 220

• 220.

• 220.5

The mass of a sample is 7.60x10^-4kg. What is the mass in mg?

• 7.60x10⁶ mg

• 7.60x10² mg

• 7.60x10^-1 mg

• 7.60x10^-10 mg

A volume of a sample is 5.98x10^-2 kL. How many mL is this?

• 5.98x10¹ mL

• 5.98x10^-5 mL

• 5.98x10⁴ mL

• 5.98x10^-8 mL

Which of the following represents a chemical change to a substance?

•  

  creating table salt from solid sodium and chlorine gas

•  

  freezing popsicles

•  

  boiling water

•  

  chopping firewood

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

The density of silver is 10.5g/cm^3. What is the mass of a cube of silver measuring 2.62 cm by 4.87 cm by 8.91 cm?

•  

  172 g

•  

  1190 g

•  

  0.923 g

•  

  10.8 g

What is the average atomic mass of an element with the following isotopic abundances:

•  

  68.06 amu

•  

  67.25 amu

•  

  68.00 amu

•  

  68.93 amu

How many neutrons are present in an atom of hydrogen-3?

• 1

•  

  not enough information

•  

  0

• 2

A neutral atom of ^ has

•  

  4 protons, 15 neutrons, and 4 electrons

•  

  4 protons, 4 neutrons, and 4 electrons

•  

  11 protons, 7 neutrons, and 11 electrons

•  

  4 protons, 7 neutrons, and 4 electrons

Tags

NGSS.HS-PS1-1

Oxygen is in which family/group?

•  

  the chalcogens

•  

  the alkali metal 

•  

  the pnictogens

•  

  the halogens

Tags

NGSS.HS-PS1-1

What is the third element down in the alkaline earths?

•  

  bromine

• sodium

•  

  calcium

• argon