Someone me! answer book questions: 1,2,3,4,8,9,10,12,16,17! (be sure to look at the two pictures i have linked)
1. what are the two characteristic properties of matter?
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2. why can’t we see atoms with the naked eye?
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4.what does it mean to say that a given compound always has the same composition?
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8. elemental bromine is a dense, dark red, pungent- smelling liquid. are these characteristics of elemental bromine physical or chemical properties?
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9. elemental bromine reacts vigorously with elemental sodium metal to form a white solid. does this characteristic of elemental bromine represent a physical or a chemical property?
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• magnesium metal is very malleable, and it is able to be pounded and stretched into long, thin, narrow “ribbons” that are often used in chemistry labs as a source of the metal. if a strip of magnesium ribbon is ignited in a bunsen burner flame, the magnesium burns brightly and produces a quantity of white magnesium oxide powder.
10. from the information given above, indicate one physical property of magnesium metal.
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12.what is meant by electrolysis? are the changes produced by electrolysis chemical or physical in nature? give an example to show your reasoning.
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16. classify the following as mixtures or pure­ substances:
a. the atlantic ocean on a sunny day
b. the brass instrument you play in the band
c. the salt on your pretzels
d. the soil you use to pot a plant
17. classify the following mixtures as homogeneous or heterogeneous:
a. gasoline
b. a jar of jelly beans
c. chunky peanut butter
d. margarine
e. the paper on which this question is printed