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Chemical Reactions 2
Test Description: Chemical equations
Instructions: Answer all questions to get your test result.
1) If you have the same substances after a change, what type of change occurred?
A
chemical
B
physical
2) Which of the following would be a PHYSICAL change that occurs when a candle is buring?
A
wick burning
B
smoke being produced
C
wax melting
D
flames producing heat
3) Type of chemical reaction that has 2 or more reactants and 2 or more products
A
replacement
B
synthesis
C
decomposition
4) Which of the following is true of a CLOSED SYSTEM
A
the atoms are destroyed in the reaction
B
matter can escape the system, mass before may be different than mass after
C
the reaction will not follow the Law of Conservation of Mass
D
all the matter is captured, mass before is the same as the mass after
5) Which fo the following is true of an OPEN SYSTEM
A
matter can escape during the reaction, mass may change
B
all the atoms will be trapped and measured after the reaction
C
the mass before will always be the same as the mass after
6) 20g of A + ____g of B ------ 60g of C What is the missing mass?
A
20g
B
30g
C
40g
D
80g
7) What 3 things are required for fire to burn?
A
oxygen, fuel, and heat
B
oxygen, carbon dioxide, and water
C
energy, chemical bonds, and fuel
D
carbon dioxide, heat, and fuel
8) If 300g of chemicals react and you measure only 200g of products, what type of system was probably used?
A
closed system
B
open system
9) If the chemicals in a reaction start to feel cold, what type of reaction occurred?
A
exothermic
B
endothermic
10) What is a precipitate?
A
a gas turning into a liquid
B
when a color change occurs in a liquid reaction
C
a solid that forms from 2 liquids reacting
D
a gas formed from a reaction
*select an answer for all questions
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