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Part 2 For 7th 1st Semester
Test Description: Chemical reaction continued
Instructions: Answer all questions to get your test result.
1) Which of the following is NOT a sign of chemical reaction?
A
gas bubble formation
B
no change in temperature
C
color change
D
change in odor
2) What is an element?
A
a single adam
B
a group of rearranged atoms
C
a substance that cannot be broken down into simpler substances by chemical means.
D
a substance that can be broken down into simpler substances by chemical means.
3) What happens to particles as heat is added to them?
A
as temperature increases, the spaces between the molecules decreases
B
as temperature decreases, the spaces between the molecules increases.
C
as temperature decreases matter evaporates
D
as temperature increases, the spaces between the molecules increases
4) What is a Periodic table of Elements?
A
a limitation on the possible solutions to a design problem.
B
a shorthand notation of one, two or three letters that represent the name of an element
C
the requirements that must be met for an engineering solution
D
the table that lists all the elements and groups them into columns by important properties
5) What happens during a chemical reaction
A
atoms are destroyed
B
atoms are rearranged
6) What does the Law of Conservation of Matter state?
A
the scientific law states that matter can be destroyed through a chemical reaction
B
The scientific law states that the type of atoms before and after a reaction can be changed if they go through a change
C
The scientific law states that all matter can be created.
D
The scientific law states that the number of atoms before and after a chemical reaction will always remain the same
7) what is a chemical reaction
A
the minimum amount of energy needed to start a chemical reaction.
B
states the total mass before a chemical reaction is the same as the total mass after the chemical reaction
C
when atoms of a substance get rearranged to form a new substance
8) what kind of chemical reactions give off thermal energy
A
endothermic reactions
B
gastrocnemius reaction
C
exothermic reactions
D
composition reaction
9) What is a molecular equation?
A
molecules that are stacked together to build something new
B
a balanced chemical equation in which the ionic compounds are stated as molecules rather that component ions.
C
molecules that are multiplied and divided to get their result.
D
an unbalanced chemical equation in which the ionic compounds are stated as molecules rather than component ions
10) what is a catalyst?
A
a substance that increases the rate of a chemical reaction
B
a substance that doesn't do anything to a chemical reaction
C
a substance that decreases the rate of a chemical reaction
D
a boy ban with justin timberlake as the lead singer.
*select an answer for all questions
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