When paper is burned, the mass of the ash is less than the original paper. Why?

Some of the products were given off as a gas.

Which of these statements describes a physical change?

Aluminum cans getting crushed before recycling.

Why do you weigh less on the moon than on Earth?

the moon has less mass than Earth

What is the evidence that an unbalanced force is acting on an object?

The motion of the object is changing.

Erin warms hot chocolate in the microwave. What happens as the temperature increases?

The particles move faster and farther apart

Energy transferred between two objects

Why does a red shirt appear red to your eyes?

it absorbs every color except red

How is temperature related to heat?

Heat causes a change in the temperature of an object

a disturbance that transfers energy

Which of these statements correctly describes the law of conservation of energy?

Energy cannot be created nor destroyed, but can change forms

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8th Grade CAST Physical Science Review

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review for upcoming standardized test #physicalscience #matter #force #motion

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Questions 20

Answers

1
When paper is burned, the mass of the ash is less than the original paper. Why?
Some of the matter is destroyed during burning.
the ash has less volume than the paper.
The mass of the ash cannot be accurately measured.
Some of the products were given off as a gas.
2
Which property of matter does not change regardless of how big a sample you have?
density
flammability
reactivity with oxygen
volume
3
Calcium is an element. What is the smallest particle you can have of calcium?
an electron from calclum
a molecule that contains calcium
a proton from calcium
an atom of calcium
4
The data below is for a moving car. What is the average speed of the car in meters per sec?
60 m/s
120 m/s
20 m/s
40 m/s
5
Through which of these media do sound waves travel most slowly?
water
wood
iron
cold air
6
Which of these particles is the smallest?
a proton
an electron
a nucleus
an atom
7
Which of these statements describes a physical change?
A banana starts to smell as it ripens.
Onions taste sweeter after they are cooked.
Copper turning green when exposed to air.
Aluminum cans getting crushed before recycling.
8
What type of energy is stored in batteries?
elastic
chemical
kinetic
thermal
9
Why do you weigh less on the moon than on Earth?
the moon is closer to the sun
the moon has less mass than Earth
the moon has a smaller radius
the moon is more dense than Earth
10
What is the evidence that an unbalanced force is acting on an object?
The mass of the object changes.
The motion of the object is changing.
The object has constant velocity.
The object remains at rest.
11
Which state of matter takes up both the volume and shape of the container that holds it?
liquid
gas
ice
solid
12
Erin warms hot chocolate in the microwave. What happens as the temperature increases?
The particles have less energy
The particles move slower and closer together
The particles are arranged in a pattern
The particles move faster and farther apart
13
What property of a metal coin would be different on Mars than on the Earth?
mass
volume
density
weight
14
Which unit is used to measure distance?
seconds
centimeters
milliliters
grams
15
What is heat?
Total thermal energy of a substance
Energy transferred between two objects
Average kinetic energy of the particles in a substance
Change in the temperature in degrees Celsius
16
Why does a red shirt appear red to your eyes?
it absorbs all colors in white light
it absorbs every color except red
it reflects all colors in white light
it reflects every color except red
17
How is temperature related to heat?
Raising the temperature causes the heat to increase
Temperature is a measure of heat
Temperature and heat are the same thing
Heat causes a change in the temperature of an object
18
What is a wave?
a disturbance that transfers energy
a disturbance that transfers matter
any type of matter that vibrates back and forth
any type of energy that makes particles move
19
Which of these statements correctly describes the law of conservation of energy?
Objects can only have potential or kinetic energy, not both
The energy destroyed when objects stop is equal to the mass
Energy cannot be created nor destroyed, but can change forms
The amount of Kinetic Energy is a constant value
20
Which form of electromagnetic energy has the shortest wavelength?
ultraviolet waves
infrared waves
gamma rays
radio waves

8th Grade CAST Physical Science Review Flashcards | StudBud