unit 1
unit 2
unit 3
unit 4
unit 5
100
Which statement describes Newton’s conception of the Solar System?
the Sun at the center, with the Earth and other planets orbiting the Sun
100
The motorcycle moves away from the house for two hours. Then it moves back toward the house for one hour. Then it parks for an hour.
100
A car applies a force of 20,000 N downward towards the street.
How much force does the street apply on the car?
exactly 20,000 N
100
Which statement describes what Boyle’s law is about?
pressure and volume of gases
100
Which type of substance is made up of at least two different chemically combined elements?
a compound
200
Which option correctly defines velocity?
speed with a specific direction
200
Which statement defines friction?
a force that opposes motion
200
What is the mechanical energy of an object?
the sum of its potential and kinetic energy
200
The particles of a sample are free to move. However, the interactions between the particles limit the volume of the sample.
Which option correctly describes the state of matter?
liquid
200
What are the substances that dissolve other substances in a solution?
solvents
300
Its velocity is decreasing.
300
If the forces on an object are balanced, what can be said about the forces?
The forces are equal and opposite.
300
What kind of wave is a microwave?
an electromagnetic wave
300
Fred observes as his teacher mixes two liquids in a container. When the liquids touch each other, they bubble violently and a gas comes out of the container.
According to this observation, what has occurred?
a chemical change
300
When sugar is mixed with water, it fully dissolves. The resulting mixture is clear throughout and looks just like water.
What kind of mixture does this statement describe?
homogeneous
400
If a ship moving forward has positive acceleration, what can be said about the velocity of the ship?
The velocity is increasing.
400
A hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.
What happens according to Newton’s first law of motion?
The puck gradually slows down because friction would be acting on it.
400
A boat is at sea, where there are sea currents. The boat uses its engine against the currents and is stationary in the water.
If the force generated by the boat to push it forward is 24,000 N, what can be said about the force applied by the current?
It is exactly 24,000 N.
400
According to Dalton, an atom _[blank]__.
Which option correctly completes this statement?
is indivisible
400
When colorless crystals of an unknown substance are mixed with water, they form a homogeneous mixture.
What would the mixture look like?
The crystals would not be visible in the mixture.
500
What did Isaac Newton do?
Published a book on light and optics and formulated mathematical equations to describe his law of gravitation
500
What is the term for a force that is not canceled out by other forces?
an unbalanced force
500
A rower in a boat pushes the water backward using an oar.
What direction will the rower and the boat move?
Forward, because action-reaction forces are directed in opposite directions.
500
Which of the following best defines density?
a measure of the amount of mass in a given amount of space
500
Sodium has the atomic number 11 and is shortened to Na.
Which given element would share similar chemical properties with sodium?
lithium (Li)