Cat 1
Cat 2
Cat 3
100
In a given chemical reaction, the energy of the products is less than the energy of the reactants. Which statement is true for this chemical reaction?
A. Energy is absorbed in the reaction.
B. Energy is released in the reaction.
C. There is no transfer of energy in the reaction.
D. Energy is lost in the reaction.
B. Energy is released in the reaction
100
Which characteristic is not a characteristic of plastic?
A. easy to mold
B. good conductor of heat
C. lightweight and durable
D. repels water
B. good conductor of heat
100
This object [brittle and shatters into many pieces][Conducts Heat] [Insulates from Heat]
YOU MUST PICK TWO
Insulates from Heat
brittle and shatters into many pieces
200
Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells?
- Burning fossil fuels contributes to climate change.
- Burning fossil fuels takes place inside expensive fuel cells.
- Fossil fuels aren’t widely available, but pure hydrogen is.
- Fossil fuels are nonrenewable.
- Burning fossil fuels contributes to climate change.
- Fossil fuels are nonrenewable.
200
Which two statements about composite materials are true? (select two)
- They’re made up of more than one substance.
- They have the same or similar properties as the materials used to make them.
- They’re always made of metal.
- They’re readily available in nature.
- They’re made up of more than one substance.
- They have the same or similar properties as the materials used to make them.
200
Drill bits are attached to power drills to make holes. Drill bits are made of [alloys] [ceramics] [composites] because they’re hard and resistant to corrosion. The bodies and handles of power drills are made of [alloys] [composites] [plastics] because they’re good insulators.
Alloys
Plastics
300
Some fuel cells are powered by hydrogen. Scientists are looking into the decomposition of water (H2O) to make hydrogen fuel with the help of the Sun’s energy. What challenge do scientists face with this task?
A. Decomposing water requires a high activation energy.
B. The Sun isn't a renewable resource.
C. Decomposing water results in toxic byproducts.
D. Scientists are uncertain what to do with the excess oxygen.
Decomposing water requires a high activation energy.
300
Uses oil and gas as starting materials
[synthetic polymer] [alloy] [ceramic]
synthetic polymer
300
The process of making alloys involves [cooling] [heating] [mixing] pure metals to remove impurities. Then the pure metals are [broken down] [cooled] [mixed] with other components.
Heating
Mixed
400
Which chemical reaction shows photosynthesis?
A. water + carbon dioxide + sunlight → oxygen + glucose
B. carbon + oxygen → carbon dioxide
C. hydrogen + oxygen → water
D. nitrogen + hydrogen → ammonia
A.
water + carbon dioxide + sunlight → oxygen + glucose
400
A hydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is released as [heat] [electrical energy] [chemical energy]. When used at home, a fuel cell eliminates the need for [oxygen] [hydrogen] [an electrical grid] because the cell is portable.
Heat
Electrical Grid
400
This object [brittle and shatters into many pieces][Conducts Heat] [Insulates from Heat]
Conducts heat
500
Which of these reactions is a combustion reaction?
A. burning wood
B. decomposition of water
C. production of food by plants with the help of the Sun's energy
D. rotting of fruits and vegetables
A. burning wood
500
In a chemical reaction, activation energy increases the [amount of chemical energy] [number of particles] [temperature] of the reactants. This outcome causes the particles to collide, which results in the [breaking up] [formation] [reaction] of new products.
Temperature
Formation
500
This object [brittle and shatters into many pieces][Conducts Heat] [Insulates from Heat]
Insulates from Heat