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Katie’s teacher has given her a sample that contains a mixture of salt, sand, and iron filings. What would be the best physical property to focus on for the first step in separating the mixture?

• boiling point

• mass

• solubility

• magnetism

A tiny piece of sand is very light but sinks in water. Why?

• It is more dense than the water.

• It is less dense than the water.

• It has a high solubility.

• It has a low solubility.

The pictures below show a 10-milliliter graduated cylinder on an electronic balance, before and after a liquid was added. Given that density equals mass divided by volume (d=m/v), what is the density of the liquid in grams per milliliter (g/mL)?

• 4.4 g/mL

• 7.3 g/mL

• 1.1 g/mL

• There is no way to determine the answer.

Tags

NGSS.MS-PS1-2

If you cut a wooden block in half, each half would have

• half the density of the original piece

• twice the density of the original piece

• the same density as the original piece

• no density at all

Which of the following best explains why silicon dioxide is a solid at room temperature, but water is a liquid?

• Silicon dioxide is soluble in water.

• Silicon dioxide has a higher melting point than water.

• Water has a higher density than silicon dioxide.

• Water conducts electricity, but silicon dioxide does not.

Tags

NGSS.MS-PS1-4

A metal coin has certain properties that can be measured. Which property of a coin is different on the moon than it is on Earth?

• density

• mass

• volume

• weight

The element silver has both physical and chemical properties, some of which do not change when the size of the sample changes. Which of these choices is a physical property that does not change when the size of the sample changes?

• mass

• volume

• density

• weight

A forensic scientist has been asked to identify a chemical compound that was found at the scene of a crime. Which of these properties would be most helpful in identifying the unknown compound?

• color

• volume

• texture

• melting point

Tags

NGSS.MS-PS3-4

The density of aluminum is 2.7 g/cm³. What is the volume of a piece of aluminum if it’s mass is 8.1 grams?

• 0.33 cubic centimeters

• 2.7 cubic centimeters

• 3 cubic centimeters

• 21.9 cubic centimeters

Students observe properties of certain materials. They notice that the items on their list that are more thermally conductive are also more electrically conductive. Based on this information, which objects could they use to connect a battery to a light bulb to make it turn on?

• glass, rubber, iron

• plastic and copper

• iron, aluminum, and copper

• aluminum and rubber

Tags

NGSS.MS-ETS1-1