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CAS Final Review
Test Description: The final review before the CAS
Instructions: Answer all questions to get your test result.
1) Any condition that can be changed in an experiment is called a variable. Which of these best explains why there should only be one variable changed in an experiment?
A
to get results from the experiment faster
B
to reduce the chance of mistakes when doing the experiment
C
to make the experiment easier to perform
D
to allow people to know what caused the observed results
2) A force of 15 newtons is exerted on an object causing it to accelerate at 5 meters per second squared. What is the mass of the object?
A
3 kilograms
B
75 kilograms
C
10 kilograms
D
20 kilograms
3) An atoms of helium has two protons and a change of zero. How many electrons does an atoms of helium have?
A
1
B
0
C
2
D
4
4) Which of these describes the location of the neutrons in an atom?
A
distributed evenly throughout the atom
B
scattered randomly throughout the atom
C
orbiting the center of the atom
D
in the center of the atom
5) Which of these statements about ions is true?
A
ions are electrically charged atoms that have lost or gained an neutron
B
ions are uncharged atoms that have lost or gained an electron
C
ions are electrically charged atoms that have lost or gained an electron
D
ions are uncharged atoms that have lost or gained a neutron
6) Which of these statements best describes the law of conservation of mass proposed by Antoine Lavoisier?
A
Energy can not be created or destroyed
B
Matter can not be created or destroyed
C
Energy occurs in discrete amounts
D
Atoms combine in fixed ratios to form compounds
7) Which of these types of reactions absorbs heat from the surroundings?
A
exothermic
B
endothermic
C
combustion
D
neutralization
8) Maria wants to find the density of a mineral sample. Which of these pairs of properties will she need to measure to determine the density?
A
temperatures and volume
B
mass and volume
C
temperature and hardness
D
mass and hardness
9) Which type of energy does a skateboarder have before rolling down a ramp?
A
kinetic energy of position
B
potential energy of motion
C
potential energy of position
D
kinetic energy of motion
10) Which of these properties can be used to classify the different types of radiation given off by the sun?
A
speed
B
pitch
C
wavelength
D
amplitude
*select an answer for all questions
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