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avanturin [10]
3 years ago
9

Why is the melting of ice a physical change? It changes the chemical composition of water. It does not change the chemical compo

sition of water. It creates new chemical bonds. It forms new products. It is an irreversible change that forms new products.
Chemistry
2 answers:
lawyer [7]3 years ago
7 0

Answer: It does not change the chemical composition of water.

Explanation:

A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

There is no change in chemical composition.

Example : melting of ice

H_2O(s)\rightarrow H_2O(l)

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions by breaking of old and making of new bonds.

Example: Oxidation of magnesium leads to formation of white magnesium oxide and is a chemical change.

2Mg+O_2\rightarrow 2MgO

snow_lady [41]3 years ago
3 0
It does not change the chemical in the composition of water. hope it helps
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What is a mixture called when it has its different components mixed evenly within the substance? Heterogeneous mixture Homogeneo
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In an endothermic reaction, a drop in temperature would be observed.<br><br> TRUE<br> or <br> FALSE
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How many grams of zinc would be required to produce 9.65g of zinc hydroxide
Effectus [21]

The question is incomplete, here is the complete question:

How many grams of zinc would be required to produce 9.65g of zinc hydroxide

Zn+2MnO₂+H₂O→Zn(OH)₂+Mn₂O₃

<u>Answer:</u> The mass of zinc required is 6.35 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

Given mass of zinc hydroxide = 9.65 g

Molar mass of zinc hydroxide = 99.4 g/mol

Putting values in equation 1, we get:

\text{Moles of zinc hydroxide}=\frac{9.65g}{99.4g/mol}=0.0971mol

The given chemical equation follows:

Zn+2MnO_2+H_2O\rightarrow Zn(OH)_2+Mn_2O_3

By Stoichiometry of the reaction:

1 mole of zinc hydroxide is produced from 1 mole of zinc

So, 0.0971 moles of zinc hydroxide will be produced from = \frac{1}{1}\times 0.0971=0.0971mol of zinc

Now, calculating the mass of zinc from equation 1, we get:

Molar mass of zinc = 65.4 g/mol

Moles of zinc = 0.0971 moles

Putting values in equation 1, we get:

0.0971mol=\frac{\text{Mass of zinc}}{65.4g/mol}\\\\\text{Mass of zinc}=(0.0971mol\times 65.4g/mol)=6.35g

Hence, the mass of zinc required is 6.35 grams

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