Describe one examples of a physical change and one examples of a chemical change.
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15
An object has a mass of 300 g (11 oz). Its volume is 15 cubic centimeter. What is the density of the object? Use the formula density = mass ÷ volume.
20 g/cc
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15
Explain two ways that mixtures can be separated.
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15
What were the three main ideas of John Dalton?
(1) All matter is made of atoms. (2) All atoms of the same element have the same properties. (3) Compounds are made of two or more elements combined together.
