3 years ago

Is magnesium a pure substance????

Chemistry

1 answer:

Kamila [148]3 years ago

3 0

Yes magnesium is a pure substance and it is a element.

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explain why particles of colloidal solution donot settle down when left undisturbed , while in the case of suspensions they do .

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Answer:

the partial of colloidal are smaller and they are not heavy whereas the partial of suspension are larger but they are heavy and less movement thus they settle down due to gravity

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3 years ago

Calculate the number of grams of C2H6 in 4.6 miles of C2H6

Bezzdna [24]

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3 years ago

the compressor exerts a pressure of 400 Pa to compress nitrogen gas from 3 L to 1 L. If no heat transfer occurs, how much will t

Triss [41]

Answer:

0.79014 J

Explanation:

According to the first law of thermodynamics:-

$\Delta U = q + w$

Where,

U is the internal energy

q is the heat

w is the work done

From the question,

q = 0 J

The expression for the calculation of work done is shown below as:

$w=P\times \Delta V$

Where, P is the pressure

$\Delta V$ is the change in volume

From the question,

$\Delta V$ = 3 - 1 L = 2 L

P = 400 Pa

The expression for the conversion of pressure in Pascal to pressure in atm is shown below:

P (Pa) = $\frac {1}{101325}$ P (atm)

Given the value of pressure = 43,836 Pa

So,

400 Pa = $\frac {400}{101325}$ atm

Pressure = 0.0039 atm

$w=0.0039\times 2\ atmL$

Also, 1 atmL = 101.3 J

So,

$w=0.0039\times 2\times 101.3\ J=0.79014\ J$ (work is done by the system)

So,

$\Delta U = 0\ J+0.79014\ J =0.79014\ J$

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4 years ago

Mike is gathering equipment for a lab where he will measure the masses of various

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Answer:

electric balance, goggles, beaker

Explanation:

I did it and got it right

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3 years ago

What happened to the amplitude from wave A to wave B?

dangina [55]

The amplitude doubled

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4 years ago

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