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Leto [7]
3 years ago
5

Please i need the answer for 18,19,20Answer and I will give you brainiliest ​

Chemistry
1 answer:
dezoksy [38]3 years ago
8 0
Number 18 is correct, number 19 is the particles speed up and the substance expands, and number 20 is decrease in volume
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How are ionic compounds named?
telo118 [61]

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3 years ago
Is air a mixture give 3 reasons
solmaris [256]

Answer: https://van.physics.illinois.edu/qa/listing.php?id=1508&t=why-is-air-a-mixture

Explanation: The best reason I can think of for why we believe that air is a mixture is that freezing air slowly yields different liquids at different temperatures. Liquid nitrogen has a different boiling point than liquid oxygen. They also freeze at different temperatures. If air were only 1 compound, then air in its entirety would have a single boiling point and a single freezing point.  

Jason (w. mike)

air is not a mixture because of scientists freezing it and finding different liquids, it is a mixture because the compounds that make up air e.g. oxygen (o2), Carbon dioxide (co2) and the most important Nitrogen which is an element and makes up 78.09% of air are not chemically bound in the way that compounds are because they can be separated easily and there has been no change in state to any of the compounds or elements in air

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