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Sarah is completing a lab in which she is required to identify an unknown substance. She records several observations and measurements of the substance. Which of the following properties will be most helpful to Sarah in making a correct identification?

• density

• volume

• mass

• 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

If Troy has a 4 cm³ cube of each of these metals, which cube will have the greatest mass?

• brass

• gold

• iron

• lead

Students are given three cubes made of unidentified materials. They need to determine whether or not the three cubes are mad of the same material. They measure the mass of each cube and record it in the table. A student immediately concludes that the cubes are made of three different materials. What observations would best support this student’s conclusion?

• The cubes all have the same volume.

• The cubes all have a shiny appearance.

• The cubes are all attracted to a magnet.

• The cubes all conduct heat.

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.

Which one changes when an astronaut goes to the moon, her weight or her mass? Why?

• mass, because it changes with gravity

• weight, because it changes with gravity

• mass because there is more matter

• weight because there is less matter

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

NGSS.MS-PS3-4