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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, the atoms were rearranged to form new substances.
B
During the reaction, new elements were made from the atoms.
C
During the reaction, the atoms were replaced with new atoms.
D
During the reaction, elements were destroyed in order to produce the products.
2) The container that would be best suited for this would also have which of the following characteristics?
A
Does not react with metallic substances
B
Allows light to easily pass through
C
Holds a large volume of liquid
D
Slows down the cooling of hot chocolate
3) When one substance reacts to form another substance, the...
A
number of atoms increases.
B
properties of the substances change.
C
mass of the substance increases.
D
mass of the substances decreases.
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 B showed an increased in volume which indicates a new substance was formed.
C
Experiement A produced bubbles which indciates a new substance was formed.
D
Experiment C crystals dissolved completely 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 have regrouped and the mass of the products is different than the mass of the reactants.
B
The arrangement of the atoms has regrouped and the new substances have the same properties as those of the reactants.
C
The arrangement of the atoms in the reactants is different than the arrangement of the atoms in the products.
D
The arrangement of the atoms in the reactants is the same as the arrangement of the atoms in the products.
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
destroyed.
C
changed to gases.
D
immeasurable.
7) What is the definition of CONDUCTION?
A
When heat is transferred through waves of heat across a distance.
B
When heat is transferred through circulation of liquid or gases
C
None
D
When heat transfers from objects that are touching.
8) What is the definition of CONVENTION?
A
When heat is transferred through circulation of liquid or gases
B
When heat transfers from objects that are touching.
C
None
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
When heat is transferred through circulation of liquid or gases
C
When heat is transferred through waves of heat across a distance.
D
None
10) Which of the following is an example of convection?
A
A hair dryer is drying up your hair.
B
When a car engine turns hot after being turned on.
C
When the AC or heater changes the temperature.
D
When you are making soup and the water is rising and lowering.
11) Which of the following is needed for convection to happen?
A
Fire
B
Light in the form or rays
C
Electromagnetic waves
D
Fluid/gas
12) When a pot is touching a stove that is on, what heat transfer is happening?
A
Conduction
B
Convection
C
Insulation
D
Radiation
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
Insulation
D
Conduction
14) The baby chickens are kept warm from the heat lamps demonstrates this type of heat transfer.
A
Radiation
B
Convection
C
Conduction
D
Insulation
15) Heat transfers from an area of ____temperature to an area of ___ temperature
A
high, low
B
low, low
C
low, high
D
high, high
16) Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer.
A
Conduction
B
Insulation
C
Convection
D
Radiation
*select an answer for all questions
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