Physical Science

What is missing from the product side of this photosynthesis reaction?

• 2 water molecules

• 12 oxygen atoms

• 12 hydrogen atoms

• 6 carbon atoms

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

When you react nitrogen and hydrogen to synthesize ammonia heat is released. How does the reaction affect the mass of the reacting chemicals?

• Mass decreases because some is converted into heat energy

• Mass stays the same because no matter is created or destroyed

• Mass increases because a more complex compound is produced.

• Mass stays the same because molecular mass cannot change form.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the equations is written correctly?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-5

How many molecules of oxygen gas are needed to balance this equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Dry ice sublimates from a solid to a gas. What happens to the carbon dioxide during the process?

• It absorbs heat energy from the air.

• It releases heat energy into the air.

• It reacts with oxygen and becomes a gas.

• It loses mass to become a gas.

Tags

NGSS.MS-PS1-4

Why did the balloon expand?

• All of the water evaporated to make a gas

• The gas in the bottle expanded because it got warmer.

• Some of the gas condensed to liquid water

• The liquid water expanded into the balloon as it became warmer.

Tags

NGSS.MS-PS1-4

Which statement because describes what is occurring between Time 1 and Time 2?

• gas to solid

• gas to liquid

• solid to liquid

• liquid to solid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Why would a balloon filled with helium gas and placed in a freezer shrink after 30 minutes?

• Number of atoms decreased

• Average kinetic energy decreased

• Heat increased

• Heat capacity increased

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Based on the diagram which property of the gas has changed?

• weight

• volume

• phase

• mass

Tags

NGSS.MS-PS1-4

Just know that I disagree with the answer to this question....

When adding sugar to tea, it was observed that the sugar kept dissolving. When ice was added to the solution, some of the sugar precipitated to the bottom of the glass. The solution (homogeneous mixture) is considered to be...

• saturated

• at equilibrium

• supersaturated

• unsaturated

Tags

NGSS.MS-PS3-4