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Blizzard [7]
3 years ago
9

What type of reaction is 4Na + O2 --> 2Na2O?

Chemistry
1 answer:
sveticcg [70]3 years ago
3 0

Answer:

Synthesis is the Chemical reaction

                                                     

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What is the total number of moles represented by 20 grams of CACO3
Nutka1998 [239]

Answer:

B. 0.2.

Explanation:

  • We can use the relation:

<em>n = mass/molar mass</em>

mass of CaCO₃ = 20 g, molar mass of CaCO₃ = 100.0869 g/mol.

<em>∴ n = mass/molar mass = </em>(20 g)/(100.0869 g/mol) <em>= 0.1998 ≅ 0.2 mol.</em>

<em></em>

<em>So, the right choice is: B. 0.2.</em>

8 0
3 years ago
When road contractors are laying cement,they first place a series of steel rods in a specific patterns. the they pour the cement
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The steel rods will enable the concrete to form without any bumps and it will add shape to the cement and strength, so no odd massive lumps are formed.

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Paha777 [63]

Answer:

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Explanation:

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A compound has to be chemically bonded, however, air is not chemically bonded.
This can be proven by freezing air. By freezing air, it yields different liquids at different temperature. Liquid nitrogen has a different boiling point than liquid oxygen.
If air was a compound, they would all have a single boiling point and a single freezing point.


Hope this helps :)
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The answer would be B
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