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3 years ago

In which of the following does matter change into a new substance?

Chemistry

2 answers:

Kaylis [27]3 years ago

8 0

The answer would be a.chemical change

cestrela7 [59]3 years ago

4 0

Answer:

Chemical change

Explanation:

Matter changes into a new substance by changing into a chemical change. In a chemical change, the substance cannot be changed back to its previous state and a new substance is formed.

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3 years ago

Which statement is true about matter?

sergeinik [125]

Answer:

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3 years ago

How many grams of O₂ are required to react completely with 14.6 g of Na to form sodium oxide, Na₂O?

Bad White [126]

The balanced chemical reaction is :

$O_2 + 4Na \ -> \ 2Na_2O$

Number of moles of Na, $n = \dfrac{14.6}{23} = 0.635 \ mol$ .

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So, number of moles of oxygen are :

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$m = \dfrac{0.635 \times 32}{4}\ gm\\\\m = 5.08 \ gm$

Therefore, 5.08 gram of oxygen will react with 14.6 gram of sodium.

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3 years ago

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