Answer:
Shape and Position
Explanation:
Potential energy is defined as the stored energy in an object due of its position or its configuration; whereas the kinetic energy is defined as energy which a body can possesses because of its motion.
Answer:
Explanation:
The property that distinguishes the potential energy from kinetic energy are the shape and position of the object, letter B. Potential energy is directly proportional with mass times gravity times the height of the object at rest.
What is the displacement of an airplane that takes off and ascends 10,000 feet in the air but, to avoid turbulence, descends down 2,000 feet?
A. 8,000 feet total
B. 8,000 feet up
C. 18,000 feet total
D. 18,000 feet up
Question 1 (2 points)
What state of matter is achieved if a large amount of energy is added to a gas? (2 points)
a
Vapor
b
Liquid
c
Plasma
d
Solid
Question 2 (2 points)
What happens to a gas when its temperature decreases? (2 points)
a
The gas becomes a plasma.
b
The molecules move more slowly.
c
The energy of the particles increases.
d
The atoms in the gas are destroyed.
Question 3 (2 points)
Mary and Ron are discussing what happens to the kinetic energy of molecules in a liquid as the liquid cools. Mary says it decreases. Ron says it stays the same. Who is correct and why? (2 points)
a
Mary is correct, because molecules are constantly losing kinetic energy no matter what state they are in.
b
Mary is correct, because as the liquid cools, the molecules slow down as they lose kinetic energy.
c
Ron is correct, because kinetic energy is a fixed characteristic of molecules and does not change.
d
Ron is correct, because kinetic energy can only increase, not decrease.
Question 4 (2 points)
Which quantity is directly related to the temperature of a substance? (2 points)
a
Average kinetic energy of the particles in the substance
b
Average size of the particles in the substance
c
Composition of the substance
d
pH of the substance
Question 5 (2 points)
As heat is added to a tube of gas, which is the most likely phase transition to occur in the tube? (2 points)
a
Gas to plasma
b
Gas to liquid
c
Gas to solid
d
Gas to element
Question 6 (2 points)
How do elements change as you move down a column in the periodic table? (2 points)
a
The atomic radius decreases.
b
The number of protons decreases.
c
The atomic mass decreases.
d
The electronegativity decreases.
Question 7 (2 points)
How are chemical and physical changes different on a molecular level? (2 points)
a
Chemical changes involve the breaking of bonds in molecules.
b
Chemical changes do not affect bonding between atoms.
c
Physical changes do not involve molecules.
d
Physical changes cause new molecules to form.
Question 8 (2 points)
How does the currently accepted model of the nucleus provide evidence of the existence of the strong nuclear force? (2 points)
a
The protons have like charges and should repel, so to stay near each other in the nucleus, there is a strong force holding them together.
b
The electrons have like charges and should repel each other, which is why they are scattered in the electron cloud.
c
The protons and neutrons have opposite charges and should attract each other, so to keep them apart, there must be a strong force in the nucleus.
d
The particles in the nucleus are separated by type, showing the existence of a strong force that keeps them apart.
Question 9 (2 points)
How do scientific models become stronger over time? (2 points)
a
New experiments verify or refine previous models.
b
As more people believe the model, it is stronger.
c
Older theories are always thought to be stronger than new theories.
d
Personal beliefs become more important to scientists over time.
Question 10 (2 points)
When scientists publish experimental results, their results are often criticized by other scientists. How is this process a source of strength of science? (2 points)
a
It encourages scientists to give convincing evidence for their results.
b
It allows scientists to keep their data secret.
c
A scientific model is not useful unless everyone thinks it is true.
d
It forces scientists to publish results that are in line with current theories.
What important event takes place during the interphase of the cell cycle?
A.
the sister chromatids are pulled away to opposite ends of the cell
B.
the sister chromatids line up along the middle of the cell
C.
the DNA is duplicated (makes a copy of itself)
Which of the following statements are TRUE for the process of dissolving NaCl in water?
a. NaCl remains bonded together.
b. Na+ and Cl- become free ions.
c. The attractive forces between water and NaCl are weaker than the forces holding NaCl together,
d. All of the above
