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STAAR Questions Session 2 - Potential/Kinetic Energy; Energy Transformations; Counting Atoms; Physical/Chemical Change
By Randall Skoog
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Last updated 20 days ago
6 questions
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Question 1
1.
Potential and Kinetic Energy (6.8A)
Students set up a demonstration to explain potential and kinetic energy.
Which statement correctly describes the ball’s kinetic and potential energy?
The ball is gaining kinetic energy and losing potential energy at Position C.
The ball has mostly kinetic energy at Position A.
Question 2
2.
Potential and Kinetic Energy (6.8A)
Two helicopters are flying at different heights but at the same speed. Helicopter
A is 1000 m above Helicopter B. What statement best describes the energy of
the two helicopters?
The two helicopters have the same gravitational potential energy, but
different kinetic energy.
Helicopter B has more gravitational potential energy than Helicopter A.
Helicopter B has more kinetic energy than Helicopter A.
Question 3
3.
Energy Transformations (6.8B)
A neighbor installs solar panels on their roof to harness renewable energy.
What energy transformations occur in this scenario?
electrical → radiant
thermal → chemical
radiant → electrical
Question 4
4.
Energy Transformations (6.8B)
When a wolf eats a rabbit and then uses the energy from the rabbit to run, the
wolf’s body converts –
chemical energy to mechanical energy
mechanical energy to chemical energy
thermal energy to mechanical energy
Question 5
5.
Counting Atoms and Elements in a Chemical Formula (7.6B)
A model of (CH
2
O)
4
was created using colored beads. Carbon atoms were
represented by black beads, hydrogen atoms by red beads, and oxygen atoms
by blue beads. Which of the following combinations of beads shows an accurate
model of (CH
2
O)
4
?
4 black, 6 red, and 4 blue
4 black, 8 red, and 4 blue
Question 6
6.
Evidence of Chemical Reactions (8.6E)
What mass of methane gas (CH
4
) is required in order to follow the Law of
Conservation of Mass?
3.5 g
2.3 g
11.3 g
The kinetic energy at Position D and Position A are equal.
The ball is gaining kinetic energy and losing potential energy at Position B.
The two helicopters have the same kinetic energy, but different gravitational
potential energy.
chemical → light
chemical energy to electrical energy
1 black, 2 red, and 1 blue
1 black, 8 red, and 1 blue
6.8 g