The pupil automatically gets bigger or smaller to let more or less light in as needed.  When it is night time the pupils in our eyes are more or less open than normal?
more
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If the gas is heated, the particles will move faster as they gain more energy.  If John cools a gas in his bunsen burner, what would happen to the gas particles they would move faster or they would move slower?
they would move slower
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The surface is heated by the Sun and some of that heat radiates back into the air. This makes the temperature higher near the surface than at higher altitudes.  Devon's cat, Fluffy, is looking for a nice warm spot to lay out in the sun. Because of how the sun heats the earth, and how some heat radiates into the air, the cat laying high up in a tree branch, rather than on the ground, would keep the cat cooler or warmer?
cooler
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It would be hard to get a big chunk of chocolate to dissolve in your milk or hot water. Maybe you could make hot chocolate from some smaller pieces like chocolate chips, but it is much easier to add a powder to your milk. This is because the smaller the pieces are, the more surface area they have.  Mary melts a 1 pound chocolate bar and 1 pound of chocolate chips in two pots. Which melts first bar or chips?
chips
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