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Shtirlitz [24]
3 years ago
14

Which of these describes a physical change? Choose the correct answer. You may only choose one.

Chemistry
1 answer:
Molodets [167]3 years ago
5 0

Answer:

A. Wood logs are burned in a fire

Explanation:

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One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
Rudiy27

Answer:

Lithium oxide, Li₂O.

Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

M_2O+H_2 \rightarrow 2M+H_2O

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

5.00gM_2O*\frac{1molM_2O}{(2x+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{xgM}{1molM}   = 2.32gM

Thus, we perform the operations in order to obtain:

\frac{10x}{2x+16}=2.32

So we solve for x as shown below:

10x = 2.32(2x+16)\\\\10x = 4.64x+37.12\\\\x = \frac{37.12}{10-4.64}\\\\x= 6.93 g/mol

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

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3 years ago
What is the gram formula mass of Ca3(PO4)2
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it should be 310.18 g/mol :)

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Which of the following is an example of eukaryotic cells?<br> animals<br> bacteria<br> archaea
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35 Before the discovery of oxygen some scientists had a different theory about burning.
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