A
B
C
D
E
100
Snowflakes are seen melting as they fall through the air. This melting occurs because the snowflakes
(1) lose heat and the surrounding air loses heat
(2) lose heat and the surrounding air gains heat
(3) gain heat and the surrounding air gains heat
(4) gain heat and the surrounding air loses heat
(4) gain heat and the surrounding air loses heat
100
Which force causes a satellite to remain in orbit?
Gravity
100
What type of reaction releases heat into its surroundings?
Exothermic OR Endothermic
Exothermic (heat is released)
100
Warm air rising in the atmosphere is an example of heat being transferred by
(1) absorption
(2) conduction
(3) convection
(4) radiation
(3) convection
Convection occurs when hot air rises, allowing cooler air to sink and get heated
Conduction is transfer of heat through touch
Radiation is the release of heat by fast-moving charged particles
100
What unit is force measured in?
Newtons (N)
200
Which characteristic of light is demonstrated by the bending of the pencil?
Refraction (the change in direction of a wave)
200
Is this substance acidic, basic, or neutral? WHY?
It is a base because the red litmus paper turned blue.
(Blue litmus paper turns red for an acid)
200
Cutting an apple into slices is a chemical change.
TRUE or FALSE
FALSE - it is a physical change
200
At which position will the force of attraction between these two magnets be greatest?
B because opposite poles attract and the poles have the strongest magnetic field, which means greater attraction
200
What is the relationship between the mass of an object and the force required to change its motion?
(HINT: F=ma)
Newton's 2nd law tells us that heavier objects need a larger force to move them.
300
What happens to the temperature as matter changes its form from a solid to a liquid?
The temperature increases
(because the molecules move faster)
300
What is the general relationship between the temperature of water and the amount of salt that will dissolve in the water?
As temperature increases, more salt will get dissolved.
300
Which item is too small to be seen with a compound microscope?
(1) an atom of iron
(2) a grain of salt
(3) an onion cell
(4) a human hair
(1) an atom of iron
300
A car travels 50 miles in 2 hours? Calculate its speed.
25 miles per hour
speed = distance/time
300
What is Newton's First Law of Motion?
(HINT: inertia)
An object will not change its position unless a force acts on it.
400
What is the difference in potential energy at position B and C? WHY?
Position C has a greater potential energy because it is at a greater height than position B.
400
What is a solvent?
A solvent is any substance, usually liquid, which is capable of dissolving one or several substances, thus creating a solution.
Water is the universal solvent.
400
What is illustrated in the diagram below?
Compound (two or more elements combined)
400
In which direction will the box move and what will be the net force (amount and direction)?
6N to the right
400
What is the pH of water? Is it acidic, basic, or neutral?
Water is a neutral substance with a pH of 7
500
Which simple machine is illustrated in the diagram below?
Lever
500
An atom has 5 protons and 7 neutrons. What is its atomic mass?
12 (protons + neutrons = atomic mass)
500
An atom has 5 protons and 7 neutrons. What is its atomic number?
5 (same as # of protons)
500
An atom has 5 protons and 7 neutrons. What is the number of electrons in the atom?
5 (same as # of protons)
500
Why won't the light bulb in a circuit light up when the switch is off/open?
Because there is no complete flow of electricity, so the circuit is incomplete