Chemistry-35 Chemistry of our environment

Which of the following is found in our atmosphere?

• water vapor

• dust and pollen

• gases

• all of the above

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6

Generally, as altitude increases, temperature ___.

• Increases

• Decreases

• Fluctuates

• Stays constant (the same)

Which layer of the atmosphere has the highest density of gas molecules?

• Exosphere

• Mesosphere

• Stratosphere

• Thermosphere

• Troposphere

What is the percentage of oxygen in Earth's atmosphere?

• 1%
• 21%
• 78%
• 90%

Which gas forms liquid first as the air is cooled

• Oxygen

• Argon

• Nitrogen

Tags

NGSS.MS-PS1-4

________ is used in medical research, to keep tissue samples frozen.

• Liquid nitrogen
• Acetone
• Liquid helium
• Liquid oxygen

Tags

NGSS.MS-PS1-4

A mixture of ________ is used as the fuel in oxy-acetylene torches for cutting and welding metal.

• Acetylene and oxygen
• Argon and helium
• Hydrogen and nitrogen
• Propane and methane

Tags

NGSS.MS-PS1-5

Which ones are consider primary air pollutants?

• Nitrogen oxides

• Sulfur dioxides

• Carbon monoxide

• all are correct!!!!

What causes acid rain?

• High concentrations of sulfuric or nitric acid from pollution
• Fertilizer use
• Pesticide use
• CFCs

Tags

NGSS.MS-PS1-2

Source of carbon monoxide

• Incomplete combustion of fossil fuels

• Combustion of fossil fuels

• Decomposition of plant and animal matters

• Photochemical reaction of CO₂