A
Stable atoms have …..
A) the same amount of electrons as protons
B) twice as many neutrons as protons
What is A, the same amount of electrons as protons?
What is energy on the move?
The weight on the end of a pendulum pauses for a split second each time it reaches the high point of its swing. This is an example of ________ energy.
A) kinetic
B) potential
What is potential?
Table salt is sodium chloride, or NaCl. Table salt is an example of a …
A) mixture.
B) compound.
What is B, compound.
Opposite charges _____ each other.
A) attract
B) repel
What is A, attract?
Energy always moves from ….
A) areas with more energy to areas with less energy.
B) area with less energy to areas with more energy.
What is B, areas with more energy to areas with less energy?
Humans are looking for alternative energy sources to fossil fuels because ….
What is we are running out of them?
When you walk barefoot across a hot sidewalk, you feel the heat on your feet. This is because the molecules are transferring heat from ….
A) your feet to the sidewalk.
B) the sidewalk to your feet.
What is B, the sidewalk to your feet.
A pH indicator measures the concentration of ______ a substance contains.
A) Hydrogen ions
B) nitrogen isotopes
What is A, hydrogen ions?
A substance that is neither an acid or a base is _____.
A) neutral
B) concentrated
What is A, neutral?
The amount of energy in the universe is …
A) always changing
B) constant
What is B, constant?
Friction and drag are similar because …
According to the conservation of energy a pendulum should swing forever switching from potential to kinetic energy and back again. This doesn’t happen in Earth’s atmosphere because …..
What is drag, friction cause by the air?
The higher a substance’s pH, the ______ it is.
A) more acidic
B) more basic
What is B, more basic?
When the weight of a pendulum is in motion, it has ___ energy.
A) potential
B) kinetic
What is B, kinetic?
What is the air is drier.
What is heat gives atoms and molecules more energy/makes them move faster?
One way the sunlight can be turned into electricity is ….
Answers will vary.
A compound is different from a mixture because …
What is a mixture can be easily separated while a compound is not easily separated?
A substance that is made up of molecules is a ____ of at least two elements chemically combined.
A) mixture
B) compound
What is B, compound?
The chain reaction of nuclear fission is different in nuclear power plants and nuclear bombs because …
What is the energy is controlled in a power plant and not in a bomb?
The difference between lift and thrust is …
What is lift is an upward force while thrust is a forward force?
Use Newton’s First Law of Motion, objects in motion stay in motion unless acted upon by an outside force, to explain why wearing a seatbelt in a car can save your life.
Answers will vary.
Explain why the air in Earth’s atmosphere is a mixture and not a compound.
What is the atoms/molecules in air can be easily separated?
A propeller pulling an airplane through he air is an example of ______.
A) thrust
B) lift
What is A, thrust?