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11 questions
The transition from a solid directly to a gas is known as
melting.
sublimation.
condensation.
vaporization.
According to the Law of Conservation of Mass, if you dissolve 50 g of sugar in 200 g of water, the total mass of the mixture would be
1000 grams
150 grams
250 grams
40 grams
Which of the following is NOT an example of a physical change?
Water freezing
Wood breaking apart
Salt dissolving in water
Baking soda and vinegar combine and form bubbles
What do particles of most substances tend to do when a substance is cooled?
Speed up and move farther apart
Slow down and move farther apart
Slow down and come closer together
Speed up and come closer together
Which of the following is an example of condensation?
Liquid water being cooled until it forms ice
Iodine crystals changing to a purple vapor
A mud puddle shrinking in the sunlight
Moisture forming on the surface of a cold mirror
Boiling and evaporation are two examples of _______________, where a liquid changes to a gas.
vaporization
condensation
sublimation
deposition
You heat up a liquid until it boils into a gas. You record the following temperatures (in degrees Celsius) every 20 seconds: 92, 96, 97, 98, 100, 100, 100, 100, 103, 105. At what temperature did boiling likely occur?
105 degrees Celsius
98 degrees Celsius
100 degrees Celsius
105 degrees Celsius
Which of the following is an example of a physical change?
Lighting a match
Separating dyes by chromatography
Water's boiling point = 100 degrees Celsius
Baking soda reacting with vinegar
What makes water unique compared to other substances?
It expands when it freezes.
It shrinks when it freezes.
It isn't unique at all.
It's extremely reactive
Ice is ____________ dense than liquid water.
a lot more
slightly more
slightly less
a lot less
CHALLENGE: Which of the following describes ONLY physical changes?
Breaking a wooden board, Lighting a candle, Dissolving sugar in water
Lighting a candle, iron rusting, dissolving salt in water
Breaking a wooden board, baking pancakes that rise a little, Chromatography
Chromatography, Breaking a wooden board, Dissolving sugar in water
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