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Unit 2 - Chemistry Review
Test Description: 7th Grade Chemistry Review
Instructions: Answer all questions to get your test result.
1) Which statement best explains what happened when a chemical reaction occured?
A
During the reaction, new elements were made from the atoms.
B
During the reaction, the atoms were rearranged to form new substances.
C
During the reaction, elements were destroyed in order to produce the products.
D
During the reaction, the atoms were replaced with new atoms.
2) The container that would be best suited for this would also have which of the following characteristics?
A
Holds a large volume of liquid
B
Slows down the cooling of hot chocolate
C
Allows light to easily pass through
D
Does not react with metallic substances
3) When one substance reacts to form another substance, the...
A
properties of the substances change.
B
mass of the substance increases.
C
mass of the substances decreases.
D
number of atoms increases.
4) Which experiment did a chemical reaction take place?
A
Experiment D resulted with the solid sinking which indicates a new substance was formed.
B
Experiment C crystals dissolved completely which indicates a new substance was formed.
C
Experiement A produced bubbles which indciates a new substance was formed.
D
Experiment B showed an increased in volume which indicates a new substance was formed.
5) Which of the following best describes what happens to the arrangement of the atoms after a reaction?
A
The arrangement of the atoms in the reactants is different than the arrangement of the atoms in the products.
B
The arrangement of the atoms in the reactants is the same as the arrangement of the atoms in the products.
C
The arrangement of the atoms has regrouped and the new substances have the same properties as those of the reactants.
D
The arrangement of the atoms have regrouped and the mass of the products is different than the mass of the reactants.
6) When you burn a candle, all that visibly remains is a small puddle of wax. The puddle of wax has less mass than the original candle. The rest of the original candle’s mass was...
A
measured incorrectly.
B
changed to gases.
C
immeasurable.
D
destroyed.
7) What is the definition of CONDUCTION?
A
When heat transfers from objects that are touching.
B
When heat is transferred through waves of heat across a distance.
C
None
D
When heat is transferred through circulation of liquid or gases
8) What is the definition of CONVENTION?
A
None
B
When heat transfers from objects that are touching.
C
When heat is transferred through circulation of liquid or gases
D
When heat is transferred through waves of heat across a distance.
9) What is the definition of RADIATION?
A
When heat transfers from objects that are touching.
B
None
C
When heat is transferred through waves of heat across a distance.
D
When heat is transferred through circulation of liquid or gases
10) Which of the following is an example of convection?
A
When the AC or heater changes the temperature.
B
When you are making soup and the water is rising and lowering.
C
When a car engine turns hot after being turned on.
D
A hair dryer is drying up your hair.
11) Which of the following is needed for convection to happen?
A
Fire
B
Light in the form or rays
C
Fluid/gas
D
Electromagnetic waves
12) When a pot is touching a stove that is on, what heat transfer is happening?
A
Insulation
B
Radiation
C
Conduction
D
Convection
13) This is a lava lamp. When the light bulb heats the wax, the wax rises. When the wax cools, it falls. This cycle of rising/falling is an example of:
A
Radiation
B
Convection
C
Conduction
D
Insulation
14) The baby chickens are kept warm from the heat lamps demonstrates this type of heat transfer.
A
Radiation
B
Insulation
C
Convection
D
Conduction
15) Heat transfers from an area of ____temperature to an area of ___ temperature
A
low, high
B
high, high
C
high, low
D
low, low
16) Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer.
A
Convection
B
Radiation
C
Insulation
D
Conduction
*select an answer for all questions
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