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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 allow people to know what caused the observed results
B
to make the experiment easier to perform
C
to get results from the experiment faster
D
to reduce the chance of mistakes when doing the experiment
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
10 kilograms
B
3 kilograms
C
75 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
2
B
4
C
0
D
1
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
in the center of the atom
D
orbiting the center of the atom
5) Which of these statements about ions is true?
A
ions are uncharged atoms that have lost or gained an electron
B
ions are electrically charged atoms that have lost or gained an neutron
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
Atoms combine in fixed ratios to form compounds
B
Matter can not be created or destroyed
C
Energy can not be created or destroyed
D
Energy occurs in discrete amounts
7) Which of these types of reactions absorbs heat from the surroundings?
A
neutralization
B
combustion
C
endothermic
D
exothermic
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
mass and volume
B
temperature and hardness
C
temperatures and volume
D
mass and hardness
9) Which type of energy does a skateboarder have before rolling down a ramp?
A
potential energy of motion
B
kinetic energy of motion
C
potential energy of position
D
kinetic energy of position
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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