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PolarNik [594]
3 years ago
12

Why is it difficult to dispose of the waste rock

Chemistry
1 answer:
sergij07 [2.7K]3 years ago
3 0
<span>because waste rock gradually builds up and takes up space on the land and is visible over the landscape. also ruins the landscape 

</span>
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How do we differentiate chemical change from physical change ​
bija089 [108]

Answer:

Chemical change :has change in mass, heat is needed, new element is formed, hard to reverse.......

Physicalchange:does not have change in mass, heat is not necessary, no new element is formed, easy to reverse

5 0
3 years ago
A sample of nitrogen gas has the temperature drop from 250.°c to 150.°c at constant pressure. what is the final volume if the in
Leviafan [203]
Charles law gives the relationship between temperature of gas and volume of gas.
It states that for a fixed amount of gas, temperature is directly proportional to volume of gas.
V / T = k
where   V- volume , T - temperature and k - constant 
\frac{V1}{T1} =  \frac{V2}{T2}
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation.
T1 = 250 °C + 273 = 523 K
T2 = 150 °C + 273 = 423 K
Substituting the values in the equation,

\frac{310 mL}{523 K} =  \frac{V}{423K}
V = 251 mL
the new volume is 251 mL 
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When a person pushes off a wall with 15N of force,how much force does the wall push back
aivan3 [116]
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To which of the third period element does this belong
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Explanation:

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2 years ago
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B protons are positive atoms and are inside the nucleus
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