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Worksheets7th Gr Practice Test Unit 2 6-11
Total questions: 25
Worksheet time: 19mins
When the steel balls hit the paper, what types of energy are some of the KE converted?
Some of the KE was converted to GE because the balls pushed back.
Some of the KE was converted to TE because the TE burned a hole in the paper that was between the two steel balls.
The KE was transferred to the paper and then back to the next steel ball.
The KE was not converted because the steel balls continued to move after they hit each other.
What determines the amount of thermal energy of an object? Choose all that apply.
Temperature
Speed
Mass
Springiness
Which object has more thermal energy - a large pot of water or a small pot of water at the same temperature?
Both pots have the same thermal energy.
The large pot has more thermal energy.
The small pot has more thermal energy.
There is not enough information to answer the question.
Do all solids have thermal energy?
No, only solids that have heat added to it has thermal energy.
Yes, all solids have thermal energy.
All solids, liquids, and gases have thermal energy when the particles move.
Yes, the particles in solids are always in continuous motion, so they always have kinetic energy. The thermal energy of an object is the total kinetic energy of all its particles.
Why does food coloring spread out faster in hot water than in cold water?
The food-coloring molecules melt in hot water and spread out.
The food-coloring molecules expand in hot water and spread out much faster.
The water molecules move faster in hot water than in cold water, so they collide with the food-coloring molecules more frequently and they spread out faster.
Because the cold water molecules don’t move as fast as the hot water molecules they block the food coloring molecules from spreading out.
A cold can of soda is taken out of the refrigerator. It slowly warms up until it is room temperature. Once the soda has warmed up, it has more thermal energy than it had in the refrigerator. Where did this additional thermal energy come from?
The thermal energy was already in the soda.
The thermal energy came from the air surrounding the soda can.
The thermal energy came from the air surrounding the soda can and from the soda itself.
The thermal energy came from the refrigerator.
You have a large mug with hot tea and a small mug with ice tea. Which mug has more thermal energy?
The small mug because all of the energy is compressed into a smaller region so it gets warmer.
The large mug with hot tea. The size of the mug does not affect the thermal energy but the temperature of the tea does.
The large mug with hot tea because the larger vessel will always have more thermal energy.
The large mug of hot tea because it contains more tea and the tea is hotter.
What energy transformations did you notice when you placed the aluminum foil in the copper chloride solution?
Thermal energy was converted into chemical energy. We saw the aluminum foil change.
The chemical reaction released chemical energy which was converted (transformed) into thermal energy. We know this because the temperature of the solution increased.
Thermal energy was converted to sound energy because we heard the aluminum foil crackle and sizzle.
The chemical reaction caused thermal energy to be converted to heat energy and sound energy and the thermometer read an increased temperature.
What influences the amount of chemical energy (CE) an object has?
The size of the beaker and how full of a chemical it is.
The temperature of the chemical solution.
The amount and type of chemicals used.
The size and temperature of the object.
What energy transformations are associated with fireworks?
Chemical reactions transform chemical energy into light energy and sound energy.
Chemical reactions transform chemical energy into thermal and light energy.
Chemical reactions transform chemical energy into thermal and light energy. The thermal energy also gets transformed into sound energy and kinetic energy of the fireworks pieces.
Chemical reactions transform chemical energy into kinetic energy and light energy.
What conditions are necessary for electrical energy to be present?
Wires and a light bulb
An energy source and a closed conducting circuit
A battery and wires
A circuit with a closed switch
What energy transfers are involved with getting the motor to run?
The energy source transfers kinetic energy through the closed circuit to the motor
The chemical reaction in the battery transforms chemical energy into electrical energy.
The electrical energy is transferred through the circuit to the motor where it is transformed to kinetic, sound, and thermal energy.
Kinetic energy is transferred through the wires to the motor which causes it to move.
Which is the most complete energy transfer diagram for the electrical circuit?
What energy transformations were involved when you made a magnesium-iron battery to turn a motor. Select all that apply.
The chemical reaction of the magnesium and iron released chemical energy which was transformed into electrical energy
The chemical reaction of the magnesium and iron released chemical energy which was transformed into kinetic energy that moved the motor.
The electrical energy was transferred through the wires to the motor where it is transformed into KE. The motor transfers KE to the environment in the form of SE and TE.
The motor transforms TE into KE and then transfers the KE to the environment.
Why does a “dead” battery no longer work? Choose all that apply.
The battery has a short circuit inside of it and no longer transforms chemical energy into electrical energy.
All the chemicals in the battery have reacted with one another and can no longer react.
The electrons are no longer able to move through the battery to the wire.
The chemicals in the battery have been used up and are no longer in the battery.
Why does a D alkaline battery last longer than a AA alkaline battery?
Basic A, AA, AAA, C, and D batteries all contain the same chemicals. The D battery is just larger and contains more chemicals.
The D battery has a different group of chemicals that is able to make more electricity than other batteries.
Electricity drains faster from a smaller battery than it does from a larger battery.
The batteries all last the same amount of time, the different sizes are for different devices
Which energy transformation and/or transfers are associated with the Secret top. Select all that apply.
The chemical energy of a person is transformed into chemical energy to start the top spinning.
The chemical energy of the battery is transformed into electrical energy and then to magnetic energy in the toy.
The kinetic energy of the top gets transformed into gravitational energy and then back to kinetic energy.
Some of the kinetic energy of the top gets transferred to the surrounding air.
What type of energy transformation is occurring?
LE—>CE
LE—>TE
TE—>CE
SE—>CE
What type of energy transformation is occurring?
EE—>KE
LE—>EE
LE—>KE
LE—>TE
What type of energy transformation is occurring?
LE —> TE
TE —> KE
LE—> KE
SE—>TE
Why is light considered a type of energy? Choose all that apply.
Light travels in waves as sound does.
When light shines, we can see objects.
Light can be transformed to and from other types of energy..
Light can make things happen.
You are attending your sister’s soccer game on a hot summer day. Her team colors are black and white and you want to support her by wearing her team colors. You have a black tee shirt and a white t-shirt. Which shirt will keep you cooler while sitting in the sun? Select all that apply.
I choose my black tee shirt to keep me the coolest as it has the best logos.
I choose the white tee shirt because the black tee shirt will get hotter as dark colors absorb more light than bright colors. The absorbed light energy gets transformed into TE and the person wearing the dark-colored shirt will be warmer.
I will choose the white tee shirt because it absorbs the most energy to keep me cool.
I will choose the white tee shirt because white reflects light.
What is similar between sound energy and light energy? Select all that apply.
Both sound and light travel in waves. The larger their amplitude the more energy they carry.
Both can be viewed as a type of energy and a way to transfer energy.
Both sound and light energy can be used to heat food.
Plants can use both sound and light to go through photosynthesis.
Which kind of material would be most effective for preventing a frozen item from melting: a thermal insulator or a thermal conductor?
A thermal conductor - because it would conduct the heat away from the frozen item.
Both the conductor and the insulator would work equally well to prevent a frozen item from melting.
A thermal insulator - because it would slow the transfer of heat from the surroundings to the frozen item.
Neither a thermal conductor nor a thermal insulator would work in this situation.
Why do some things stop?
Objects will stop when they no longer have access to a source of electricity.
Objects will stop when all of their kinetic energy has been transferred to their surroundings.
Objects will stop when the surroundings absorb all of the kinetic, thermal, and sound energy.
Objects will stop when gravitational energy no longer is acting on the object.
