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Oksi-84 [34.3K]
2 years ago
15

4. What energy transformation takes place when you light a match?

Chemistry
1 answer:
Pie2 years ago
5 0

Mechanical Energy to Thermal Energy

hope it helps...!!!

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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 <u>reaction</u> between Mg and CuO, so:

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

If we check <u>the reaction is already balanced</u>. 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 <u>molar ratio</u> between Mg and CuO is 1:1, so:

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

Now we can <u>calculate the mass of M</u>g 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

<u>With this in mind, the student added enough Mg to recover all the Cu.</u>

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
A single atom of platinum has a mass of 3.25 x 10-22g. What is the mass of 6.0 x 1023 platinum atoms?
boyakko [2]
Even though the numbers are in scientific notation, they are still just numbers. Essentially the question is as simple as "An apple weighs an ounce, how much do 35 apples weigh?". So all you have to do is multiply.

3.25 x 10^{-22}   x  6.0 x10^{23}  = 195

6 0
3 years ago
Although Plato and Aristotle disagreed with democritus what did his theory suggest was true about all matter?
Gnesinka [82]
Democritus believed that the universe was composed of atoms, correctly, of course. However, at the time, Plato's and Aristotle's hypothesi were just as valid because everyone was a philosopher. There were no scientists back then.
6 0
3 years ago
Read 2 more answers
2 What is the correct sequence of steps for the preparation of a pure sample of copper(II) sulfate
Lina20 [59]

Answer:

The correct answer is - B. dissolving → evaporation filtration → crystallisation

Explanation:

The method of the preparation of a pure sample of copper(II) sulfate from dilute sulfuric acid and copper II oxide is given as follows:

step 1. Adding dilute sulfuric acid into a beaker. Using bunsen burner heat the beaker.

step 2. Adding the copper (II) oxide into the beaker and give it a little time at a time to the warm dilute sulfuric acid and stir

step 3. Filtering the mixture into an evaporating vessel to remove the excess copper (II) oxide and water from the filtrate.

Step 4. leave the rest filtrate to crystallize.

Copper (II) Oxide  {CuO (s)}  +  Dilute Sulfuric Acid {H2SO4 (aq)}   →  Copper (II) Sulphate {CuSO4 (s)}   +  Water {H2O}

4 0
3 years ago
Aluminum can react with oxygen gas to produce aluminum oxide (Al2O3). What type of reaction is this?
Pachacha [2.7K]

It's Synthesis, single replacement is incorrect.

6 0
3 years ago
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