Module 4

which molecule will form a solution with a very high hydroxide ion concentration?

• H2SO4

• NaOH

• H2O

• CO2

Tags

NGSS.MS-PS1-2

A student tests two solutions with the same acid–base indicator. If the two solutions have different hydroxide ion concentrations, which would you expect to be true?

• The two solutions will have identical hydrogen ion concentrations.

• The indicator will be the same color in both solutions.

• The indicator will have different colors in the different solutions.

• The two solutions will react to produce a salt and water

A certain indicator has a color chart that shows that when the indicator is pink, the solution is basic. What is true about a solution that produces a pink color when mixed with the indicator?

• The solution has more hydronium ions than hydroxide ions.

• The solution contains neither hydroxide ions nor hydronium ions.

• The solution contains nothing but water.

• The solution has a pH greater than 7.

Which of the following is NOT true about acids?

• They have low pHs and a citrus taste

• Some acids do not contain hydrogen ions

• Acids increase hydroxide ion concentrations in water solutions

• Acids feel slippery to the touch

When acids react with bases, what are the products?

• Neutral compounds

• A salt and water

• CO2 and water

• Solid precipitates

Which of the following describes how a mechanical wave is different from an electromagnetic wave?

• Mechanical waves require a medium; electromagnetic waves don't.

• Mechanical waves transmit energy; electromagnetic waves transmit matter.

• Electromagnetic waves require a medium; mechanical waves don't.

• Electromagnetic waves transmit energy; mechanical waves transmit matter.

Imagine a ringing bell set inside a sealed glass jar. Once all the air is removed and a vacuum is created, the ringing sound is no longer heard. Explain why this happens.

• The glass prevents any sound from escaping.

• The lack of air in the jar causes the ringing to stop.

• Without air, the sound waves cannot travel to the ear.

• The pressure of the outside air causes the sound to remain within the jar.

A wave can make a leaf bob up and down on the water, but it cannot move the leaf toward the shore. This is because waves only transfer

• Matter

• Energy

• Medium

• Forces

Tags

NGSS.MS-PS4-1

Which of the following elements is a noble gas?

• Helium

• Oxygen

• Nitrogen

• Carbon

What is the primary gas found in the Earth's atmosphere?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Argon