You are given a sample of iron filings and sulfur powder. How can you separate them using their physical properties?

Use a magnet to attract the iron filings

Which method would you use to separate a mixture of sand and salt?

Dissolve the salt in water, then filter out the sand

Use a magnet to remove the salt

Heat the mixture to evaporate the sand

If you pour oil and water into a container, the oil floats on top of the water. What does this tell you about the density of oil compared to water?

Oil and water have the same density

A student wants to measure the volume of an irregularly shaped rock. Which method should they use?

Water displacement in a graduated cylinder

Use a ruler to measure length, width, and height

A student observes that a metal changes color when left outside in the rain. What type of change is this, and what evidence supports your answer?

Chemical change; color change indicates a new substance formed

Physical change; color change is temporary

Physical change; no new substance is formed

Chemical change; no evidence of a new substance

Which of the following best explains why melting is a physical change?

The substance changes state but keeps its identity

The substance forms a new substance

The substance reacts with another substance

A student mixes vinegar and baking soda and observes bubbling. What does this observation indicate?

A chemical change is occurring, producing a gas

A physical change is occurring, producing a solid

Only a temperature change is occurring

You are given two clear liquids. Design an experiment to determine if they are the same substance or different substances.

Measure and compare their boiling points and densities

Mix them together and see if they react

Taste them to see if they are different

Shake them and see if bubbles form

A student finds that a metal object has a mass of 120 g and a volume of 15 cm $$^3$$ . The student claims the object is aluminum. Use density to support or refute the student's claim. (Density of aluminum is about 2.7 g/cm $$^3$$ .)

Refute; the object's density is 8 g/cm $$^3$$ , which is much higher than aluminum

Support; the object's density matches aluminum

Support; the object's density is less than aluminum

Refute; the object's density is less than aluminum

You are given a mixture of iron filings, sand, and salt. Describe a procedure to separate all three substances.

Use a magnet to remove iron, dissolve salt in water, filter out sand, then evaporate water to get salt

Add water to dissolve everything, then filter

Use a magnet to remove sand, then filter out iron

Heat the mixture to evaporate the salt

A student observes that a piece of wood floats in water but sinks in oil. What can the student conclude about the densities of wood, water, and oil?

The density of wood is greater than oil but less than water

The density of wood is less than water but greater than oil

The density of wood is greater than both water and oil

The density of wood is less than both water and oil

Topic 1 Review

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Easy

•

NGSS

MS-PS1-2, MS-PS1-4, MS-PS1-5

Standards-aligned

Joseph McNulty

Used 1+ times

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