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hoa [83]
3 years ago
10

Need help with physical changes

Chemistry
1 answer:
AnnZ [28]3 years ago
4 0

Answer:

I give u three in explanation

Explanation:

Crushing the can, stomping on the can, and squishing the can

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THE PEAK TUTORS
scoundrel [369]

Answer:a

Explanation:

ddk

5 0
3 years ago
A. 207 kJ<br> B. 4730 kJ<br> C. 9460 kJ<br> D. 414 kJ
Leno4ka [110]

Answer:

\boxed {\boxed {\sf C. \ 9460 \ kJ}}

Explanation:

The formula we must use is given to us:

q=mL_{vapor}

q is the energy, m is the mass, and L(vapor) is the latent heat of vaporization.

The energy is what we calculate and the mass is 2 kilograms. We need to find the latent heat of vaporization, which is on the table.

  • We know the sample is copper.
  • Find that element on the table, then the third box tells us it's latent heat of vaporization is 4730 kJ/kg

Now we know:

m= 2 \ kg \\L_{vapor}=4730 \ kJ/kg

Substitute the values into the formula.

q=(2 \ kg ) * (4730 \ kJ/kg)

Multiply. Note that the kilograms (kg) will cancel each other out.

q= 2* 4730 \ kJ

q= 9460 \ kJ

<u>9460 kilojoules</u> are required to vaporize 2 kilograms of copper.

3 0
3 years ago
brina thinks dissolvung more salt in water cause the mixture freezing temperature to chang which is the best type of sciectific
ddd [48]

put some water out with less salt and then some more water out with more salt and look at the differences with the freezing.

7 0
4 years ago
A teacher makes the following statement.
DedPeter [7]
I believe the correct answer from the choices listed above is option A. The topic that the teacher is talking about would be distillation of a mixture. Gasoline is processed by distillation. Hope this answers the question. Have a nice day.
5 0
3 years ago
Read 2 more answers
 Some athletes have as little as 3.0% body fat. If such a person has  body  mass of 65 kg,how many pounds of body fat  does  tha
coldgirl [10]
They would have 5%:::::)
8 0
4 years ago
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