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2 years ago

Which of these is an example of chemical change

Chemistry

1 answer:

Margaret [11]2 years ago

8 0

Answer:

Burning, cooking, rusting and rotting are examples of chemical changes.

Explanation:

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Consider the following mechanism.

solong [7]

Answer :

(a) The overall equation is:

$ClO^-(aq)+I^-(aq)\rightarrow Cl^-(aq)+IO^-(aq)$

(b) The intermediates are :

$OH^-(aq),HClO(aq)\text{ and }HIO(aq)$

Explanation :

Part (a) :

(1) $ClO^-(aq)+H_2O(l)\rightarrow HClO(aq)+OH^-(aq)$ (fast)

(2) $I^-(aq)+HClO(aq)\rightarrow HIO(aq)+Cl^-(aq)$ (slow)

(3) $OH^-(aq)+HIO(aq)\rightarrow H_2O(l)+IO^-(aq)$ (fast)

By adding the three equations and cancelling the common terms on both side, we will get the overall equation.

$ClO^-(aq)+I^-(aq)\rightarrow Cl^-(aq)+IO^-(aq)$

Part (b) :

Intermediates are generated and consumed in the mechanism and do not include in the overall equation.

Since, intermediates will not include in the overall mechanism.

The intermediates are :

$OH^-(aq),HClO(aq)\text{ and }HIO(aq)$

7 0

2 years ago

In the formation of sodium chloride by the combination of sodium and chlorine:

Ierofanga [76]

Answer:

Na(s) + Cl2(g) = NaCl(s)

7 0

3 years ago

A sample of lithium sulfate, (Li2SO4), has 2.94 x 1023 atoms

Crazy boy [7]

Answer:

0.245 moles

Explanation:

moles of lithium = 2*moles of Li2SO4

so moles of LI2SO4=2.94*10^23/(2*6*10^23)=0.245

3 0

2 years ago

DUDE SOMEONE HELP ill love u forever

dybincka [34]

Answer:

uwu good

Explanation:

4 0

2 years ago

Think about the decomposition reaction of ozone.

____ [38]

Answer:

3441.6 grams.

Explanation:

2 O₃ → 3 O₂

First we convert 71.7 moles of ozone (O₃) into moles of oxygen gas (O₂), using the stoichiometric coefficients of the reation:

71.7 mol O₃ * $\frac{3molO_2}{2molO_3}$ = 107.55 mol O₂

Then we convert 107.55 moles of O₂ into grams, using the molar mass of O₂:

107.55 mol * 32 g/mol = 3441.6 g

3 0

2 years ago