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

Authored by Joseph McNulty

Science

8th Grade

NGSS covered

Used 1+ times

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Content View

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30 questions

Show all answers

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which state of matter has a definite shape and a definite volume?

Solid

Liquid

Gas

Plasma

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the smallest unit of an element that retains the properties of that element?

Atom

Molecule

Compound

Mixture

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is an example of a mixture?

Air

Water

Carbon dioxide

Sodium chloride

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What term describes a substance made of only one kind of atom?

Element

Compound

Mixture

Solution

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is a physical property?

Color

Flammability

Reactivity

Ability to rust

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following best describes a compound?

A substance made of two or more elements chemically combined

A mixture of two or more substances

A single type of atom

A solution of metals

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which tool would you use to measure the mass of an object?

Triple beam balance

Thermometer

Ruler

Stopwatch

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Topic 1 Review

Which state of matter has a definite shape and a definite volume?

What is the smallest unit of an element that retains the properties of that element?

Which of the following is an example of a mixture?

What term describes a substance made of only one kind of atom?

Which of the following is a physical property?

Which of the following best describes a compound?

Which tool would you use to measure the mass of an object?

What is the SI unit for measuring length?

Which unit would you use to measure the volume of a liquid?

What instrument is commonly used to measure the temperature of a substance?

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