Where does rain come from, and where do puddles go?
You said clouds are water vapor. Vapor is an invisible gas; clouds are made of tiny liquid droplets that vapor turned into.
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1 lesson for “The water cycle”
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Can one kind of rock become another?
You said granite stays granite forever. Given enough time, granite can become sediment, or metamorphic rock, or magma, and back again.
Try this lessonIs carbon ever created or destroyed?
You said burning makes new carbon. The atoms were already here; burning just moves stored carbon back into the air.
Try this lessonWhich way does water move through a cell membrane?
You said water rushes into the cell because the cell needs it. Water does not choose sides; it simply spreads toward the saltier solution.
Try this lesson36 g of water: 2 moles or half a mole?
36.0 g of water is 2.00 mol, and 2.00 mol of CO2 is 88.0 g. Practice reading the units to choose divide or multiply.
Try this lessonIs water's molar mass 17 or 18 g/mol?
The subscript 2 in H2O is easy to miss in a molar mass. Count it once, and every conversion after stays right.
Try this lessonWhat is the second product of acid plus base?
Acid and base do not vanish. Their ions trade partners and become a salt and water. Fill in the two products.
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