Review

Which sentence best explains why her hair is standing up straight after going down the slide?

• Her hair and the slide have like charges, making them repel each other.

• Her hair and the slide have opposite charges, making them repel each other.

• The slide caused friction making each of her hairs have a like charge, which repel each other.

• The slide caused friction making each of her hairs have an opposite charge, which attract each other.

Which sentence best describes a difference between static electricity and current electricity?

• Static electricity is stored energy while current electricity is moving energy.

• Static electricity is created energy while current electricity is spent energy.

• Static electricity is negative energy.

• Static electricity is human-harnessed energy while current electricity is natural energy.

Will the light bulb shine? Why or why not?

• Yes, everything is connected correclty.

• Yes, it is a functioning circuit.

• No, it isn't connected to the battery correctly.

• No, the switch is not turned on.

​Kamia says that the lightning is an example of current electricity. Marlon says that the lightning is an example of static electricity. Which statement best explains who is correct?

• Kamia because the lightning is very powerful and can cause damage.

• Kamia because the lightning sends volts of electricity through the ground.

• Marlon because the lightning uses the ground as a conductor to pass from the clouds.

• Marlon because the lightning is a quick discharge of built up electrons.

Which of the following shows an example of water acting as a conductor?

• ice on the tops of a lake keeping the bottom of the lake from freezing

• water putting out a fire by blocking the absorption of oxygen

• electricity traveling through puddles when a storm knocks down a power line

• water inside of the body keeping a constant temperature

What is the main difference between conductors and insulators?

• Insulators are positively charged and conductors are negatively charged.

• Electrical currents move through conductors better than insulators.

• Electrical currents move through insulators better than conductors.

• Conductors have a neutral charge and insulators have a negative charge.

Compared to static electricity, how do electrons move in current electricity?

• The electrons move freely.

• The electrons do not move.

• The electrons repel each other.

• The electrons are grouped in place.

What is most likely to happen when a bar magnet is held up next to an electromagnet that is turned on?

• The magnets will always attract each other because opposites attract.

• The magnets will always repel each other because of strong magnetic field.

• The magnets will repel each other when like poles of each magnet are placed together, and attract when opposite poles are placed together.

• The magnets will attract each other when like poles of each magnet are placed together, and repel when opposite poles are placed together.

A container has a mixture of salt and sand in it. How will adding water to the container help to separate the salt and sand?

• Salt will not dissolve in water, sand will.

• Salt will sink, and sand will float to the top.

• Salt will dissolve in water, and sand will not.

• Salt will float to the top, and sand will sink.

A food scientist placed a raw egg in a pan and cooked it. The white and yolk became a thick solid mass. What evidence that a chemical reaction occurred when the egg was cooked?

• The cooked egg cannot return to its raw state.

• The egg changed from a liquid state to a solid state.

• Water vapor was released as the egg was heated.

• Some of the raw egg was boiled and released as gas.