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1st Semester 7th Grade Exam
Test Description: Chemical changes
Instructions: Answer all questions to get your test result.
1) All matter is made of invisible particles called
A
atoms
B
mixtures
C
compounds
D
adams
2) What is Mass in science?
A
The amount of money something has.
B
A catholic church service.
C
The amount of observable matter something has.
D
The amount of volume something has.
3) What kind of chemical reactions give off energy.
A
endothermic reactions
B
gastrocnemius reactions
C
exothermic reactions
D
composisiton reactions
4) Which of the following happens during a chemical reaction?
A
atoms are destroyed
B
atoms are rearranged
C
atoms change into new types of atoms
D
atoms are created
5) What is the conservation of mass?
A
The scientific rule that says the number of atoms before and after a chemical reaction must remain the same.
B
The scientific rule that says that matter can be destroyed through a chemical reaction.
C
The scientific rule that says that the type of atoms before and after a reaction can be changed if they go through a chemical
D
The scientific rule that says that matter can be created.
6) Gas particles....
A
fill the entire space in the container
B
are tightly-packed together
C
take the shape of the container, but don't always fill it
D
have a definite shape
7) In a chemical reaction, what are the reactants?
A
The substances that are formed during a chemical reaction.
B
The unidentifiable substances.
C
The formation of gas bubbles.
D
The substances that are present at the start of a chemical reaction.
8) What is Matter?
A
Anything that can be turned into a liquid.
B
Anything that takes up space and has mass.
C
Anything that takes up a collection and has gas.
D
Anything that has volume.
9) Which of the following are COMPOUND?
A
magnesium nitrate Mg(NO3)2
B
aluminum (Al)
C
chromium (Cr)
D
ozone (O3)
10) Carbon dioxide is a molecule that is formed from 2 atoms of oxygen and 1 atom of carbon. It has 2 double bonds. Which of the following shows a carbon dioxide atom?
A
C=O=O
B
O=C=O
C
C - O - C
D
C - O - O
11) What are formed when 2 or more atoms join together?
A
elements
B
molecules
C
compounds
12) Kinetic energy would be best described as
A
energy due to motion
B
stored energy
C
power
D
elastic energy
13) How could you explain what happens to particles when thermal energy is added to a solid?
A
the particles heat up and move slower
B
the particles cool off and move faster
C
the particles heat up and move faster
D
the particles cool off and move slower
14) Which of the following is NOT an indication of a chemical reaction?
A
a gas being created
B
a phase change
C
a color change
D
a temperature change
15) When looking at a chemical equation, which side of the yield sign would you find the reactants?
A
right
B
left
16) When looking at a chemical equation, which side of the yield sign would you find the products?
A
right
B
left
17) The kinetic theory of matter states that substances are made up of constantly ___________________ particles.
A
moving
B
physical
C
heating
D
shrinking
18) Results from scientific experiments and observations can raise more questions and lead to further studies.
A
true
B
false
19) Which of the following statements best describes the term “criteria”?
A
Criteria are restrictions of items which can’t be used, limitations on time, and limitations of design.
B
Criteria are examples of prototypes.
C
The research which is done to determine information that should be used in the development of new products.
D
Criteria are the required materials, design, and the amount of time needed to develop a product.
20) Which of the following statements best describes the term “constraints”?
A
Constraints are examples of prototypes.
B
Constraints are restrictions of items which can’t be used, limitations on time, and limitations of design.
C
Constraints are examples of prototypes.
D
Constraints are the required materials, design, and the amount of time needed to develop a product.
*select an answer for all questions
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