1st Semester 7th Grade Exam Question Preview (ID: 62572)
Chemical Changes.
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All matter is made of invisible particles called
a) atoms
b) mixtures
c) adams
d) compounds
What is Mass in science?
a) The amount of observable matter something has.
b) The amount of volume something has.
c) The amount of money something has.
d) A catholic church service.
What kind of chemical reactions give off energy.
a) endothermic reactions
b) exothermic reactions
c) composisiton reactions
d) gastrocnemius reactions
Which of the following happens during a chemical reaction?
a) atoms are created
b) atoms are destroyed
c) atoms are rearranged
d) atoms change into new types of atoms
What is the conservation of mass?
a) The scientific rule that says that matter can be created.
b) The scientific rule that says that matter can be destroyed through a chemical reaction.
c) The scientific rule that says the number of atoms before and after a chemical reaction must remain the same.
d) The scientific rule that says that the type of atoms before and after a reaction can be changed if they go through a chemical
Gas particles....
a) have a definite shape
b) take the shape of the container, but don't always fill it
c) fill the entire space in the container
d) are tightly-packed together
In a chemical reaction, what are the reactants?
a) The substances that are present at the start of a chemical reaction.
b) The substances that are formed during a chemical reaction.
c) The unidentifiable substances.
d) The formation of gas bubbles.
What is Matter?
a) Anything that can be turned into a liquid.
b) Anything that has volume.
c) Anything that takes up space and has mass.
d) Anything that takes up a collection and has gas.
Which of the following are COMPOUND?
a) magnesium nitrate Mg(NO3)2
b) aluminum (Al)
c) chromium (Cr)
d) ozone (O3)
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) O=C=O
b) C=O=O
c) C - O - O
d) C - O - C
What are formed when 2 or more atoms join together?
a) molecules
b) compounds
c) elements
d)
Kinetic energy would be best described as
a) power
b) energy due to motion
c) stored energy
d) elastic energy
How could you explain what happens to particles when thermal energy is added to a solid?
a) the particles cool off and move faster
b) the particles cool off and move slower
c) the particles heat up and move slower
d) the particles heat up and move faster
Which of the following is NOT an indication of a chemical reaction?
a) a phase change
b) a temperature change
c) a color change
d) a gas being created
When looking at a chemical equation, which side of the yield sign would you find the reactants?
a) left
b) right
c)
d)
When looking at a chemical equation, which side of the yield sign would you find the products?
a) left
b) right
c)
d)
The kinetic theory of matter states that substances are made up of constantly ___________________ particles.
a) heating
b) moving
c) shrinking
d) physical
Results from scientific experiments and observations can raise more questions and lead to further studies.
a) true
b) false
c)
d)
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 the required materials, design, and the amount of time needed to develop a product.
c) Criteria are examples of prototypes.
d) The research which is done to determine information that should be used in the development of new products.
Which of the following statements best describes the term “constraints”?
a) Constraints are restrictions of items which can’t be used, limitations on time, and limitations of design.
b) Constraints are the required materials, design, and the amount of time needed to develop a product.
c) Constraints are examples of prototypes.
d) Constraints are examples of prototypes.
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