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3 years ago

Multiple choice. Please help.

Chemistry

1 answer:

Ludmilka [50]3 years ago

7 0

Answer:

7. B

8. B

9. A

10. A

11. Increases

Again..I hope it helps.✌

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What happens when warm air rises? (5 points)

Alika [10]

The movement creates a difference in air pressure.

When warm air rises it goes up to top of atmosphere.
The cold air remains at bottom.
Which makes a blank space in between.
To fill that space air comes from all sides
Which makes difference in pressure.
It becomes reason for creation of Tornado, hurricane,Cyclones etc

7 0

3 years ago

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A student is given 1.525 g of pure CuO. To recover the Cu present in the compound, the dark powdery solid was dissolved in 15.0

ikadub [295]

Answer:

The amount of Mg was enough

Explanation:

In this case, we have to start with the reaction between $Mg$ and $CuO$ , so:

$CuO~+~Mg~->~MgO~+~Cu$

If we check the reaction is already balanced. Now, we can do some stoichiometry to calculate the amount of Mg. The first step is the number of moles of $CuO$ . To this we have to calculate the molar mass of $CuO$ first, so:

Cu: 63.55 g/mol and O: 16 g/mol. So, (63.55+16)= 79.55 g/mol.

Now, we can calculate the moles:

$1.525~g~CuO\frac{1~mol~CuO}{79.55~g~CuO}=0.0192~mol~CuO$

The molar ratio between $Mg$ and $CuO$ is 1:1, so:

$0.0192~mol~CuO=0.0192~mol~Mg$ .

Now we can calculate the mass of Mg if we know the atomic mass of Mg (24.305 g/mol). So:

$0.0192~mol~Mg\frac{24.305~g~Mg}{1~mol~Mg}=0.466~g~Mg$

With this in mind, the student added enough Mg to recover all the Cu.

Note: The HCl doesn't take a role in the reaction. The function of HCl is to dissolve the $CuO$ .

I hope it helps!

3 0

3 years ago

Is my answer correct?

ioda

Yes you are right .. X is undergoing a change from solid to gas at point E

7 0

3 years ago

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What are the products of the chemical reaction that occurs when zinc metal is added to an aqueous solution of hydrochloric acid?

Alinara [238K]

Zn(s) +2 HCl(aq) ---> ZnCl2(aq) +H2(g) (products are Zinc chloride and hydrogen gas)

3 0

3 years ago

How many grams are in 5.60 moles of sodium hydroxide (NaOH)

Illusion [34]

Answer: I believe it should be 224g.

Explanation: There are 40g for every one mole of NaOH, so multiply the two to get to 224. I hope that helps!

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3 years ago

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