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1Which is evidence of a chemical change?
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Answer: a gas forms when two substances mix
New gas suggests a new substance formed.
2Which is a renewable resource?
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Answer: solar energy
Sunlight is continuously available.
3What is a fossil fuel?
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Answer: a fuel formed from ancient organisms
Coal, oil and gas formed from ancient life.
4A wave has a frequency of 8 Hz and a wavelength of 7 meters. Using the formula v = fλ, what is the wave's speed?
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Answer: 56 m/s
Wave speed = frequency × wavelength = 8 Hz × 7 m = 56 m/s. Distractors come from adding or subtracting the values instead of multiplying.
5A scientist changes only one variable at a time so that
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Answer: results can be linked to that variable
A controlled experiment isolates one variable.
6A weather map shows tightly packed isobars (lines of equal pressure) over a region. What does this most likely indicate about the weather in that area?
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Answer: Strong winds, because a steep pressure gradient causes air to move quickly
Tightly packed isobars indicate a steep pressure gradient over a short distance, which causes air to accelerate more quickly from high to low pressure, resulting in stronger winds.
7Which factor is most directly responsible for driving global wind patterns on Earth?
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Answer: Unequal heating of Earth's surface by the sun
Because Earth's surface is curved, sunlight strikes different latitudes at different angles, causing unequal heating. This creates temperature and pressure differences that drive global wind patterns.
8A toy car travels a distance of 12 meters in 6 seconds at a constant speed. What is the car's average speed?
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Answer: 2 m/s
Average speed = distance / time = 12 m / 6 s = 2 m/s. Distractors result from adding, multiplying, or subtracting the given values instead of dividing.
9A wave has a frequency of 3 Hz and a wavelength of 2 meters. Using the formula v = fλ, what is the wave's speed?
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Answer: 6 m/s
Wave speed = frequency × wavelength = 3 Hz × 2 m = 6 m/s. Distractors come from adding or subtracting the values instead of multiplying.
10Which best explains the difference between an earthquake's magnitude and its intensity?
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Answer: Magnitude measures the energy released at the earthquake's source, while intensity measures the effects felt at a specific location
Magnitude is a single value representing the energy released at an earthquake's source, while intensity describes the varying effects and damage experienced at different locations, which can differ based on distance and geology.