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Anton [14]
3 years ago
12

True or false? a closed system interacts with the environment constanly?

Chemistry
1 answer:
maw [93]3 years ago
5 0
False (99,99%) :)))))
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Show your work with good use of units, rounding, and significant figures. [Hint: it is good practice to show the value of your a
mel-nik [20]

Heat required : 4.8 kJ

<h3>Further explanation </h3>

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

The heat needed to raise the temperature

Q = m . c . Δt

1. heat to raise temperature from -20 °C to 0 °C

\tt Q=10\times 2.09\times (0-(-20)=418~J

2. phase change(ice to water)

\tt Q=10\times 333=3330~J

3. heat to raise temperature from 0 °C to 25 °C

\tt Q=10\times 4.18\times (25-0)=1045~J

\tt Q~tot=418+3330+1045=4793~J\rightarrow rounding~and~2~sig~figs=4.8~kJ

3 0
2 years ago
Why does water with salt in it freeze much more slower than water without it ? Explain
serg [7]
When you add salt to water, you lower to freezing point of the substance.

So for example, normal water freezes at 0°C. But water with salt in it won't freeze at 0°C, because its freezing point is lowered. 

In answer to the question. It takes longer for water with salt in it to freeze because the substance requires a lower temperature than normal water to freeze.
4 0
3 years ago
Read 2 more answers
Hi can you pls help :)
Luda [366]

Answer:i think it is c, it explodes in water because that’s a chemical reaction

Explanation:

8 0
2 years ago
Are you absolutely sure this is right?
Natalka [10]
Um yes or no or Mamie <span />
4 0
2 years ago
The ph of a solution is determined to be 4.1. it is?
LenKa [72]
4.1 is acidic on the Ph scale
4 0
2 years ago
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