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iren2701 [21]
2 years ago
10

Which of the following does NOT involve a physical change?

Chemistry
1 answer:
jasenka [17]2 years ago
4 0

Answer:mixing decomposing

Explanation:

Melting and grinding changes the physical form and mixing decomposing doesn’t

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Determine the vapor pressure (atm) of rubbing alcohol (isopropanol) at 20.0 °C. The normal boiling point of isopropanol is 82.3
Scorpion4ik [409]
To answer this question, we will use the equation of Clausius-Clapeyron which can be written as follows:
ln(P1/P2) = ΔH/R x (1/T2 - 1/T1)

Now, let's check the parameters in this equation:
P1 is the normal pressure of the vapor which is 4.24 kPa 
T1 is the boiling point at this pressure which is 293 K
ΔH is the heat of vaporization given as 39.9 kJ/mol
T2 is given as 355.3 K 
and we need to calculate P2

Substitute in the equation to get P2 as follows:
ln(4.24/P2) = 39.9/0.008314 x (1/355.3 - 1/293)
P2 = 101.2 kPa = 0.998766 atm
8 0
3 years ago
Identify the correct charge of each atomic particle
MA_775_DIABLO [31]

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

There are 3 sub-atomic particles present in an atom. They are: Electrons, protons and neutrons.

  1. <u>Electrons:</u> They are negatively charged particles and are present around the nucleus in the orbits.
  2. <u>Protons:</u> They are positively charged particles and are present inside the nucleus of an atom.
  3. <u>Neutrons:</u> They are neutral particles which means they do not carry any charge. They are present in the nucleus of an atom.

Hence, the correct answer is Option B.

7 0
3 years ago
Read 2 more answers
5. The heat of fusion of lead is 25 J/g and its melting point is 601 K. How much heat is given off as 3.0 g
PIT_PIT [208]

Answer:

the heat given off is 75 J.

Explanation:

Given;

latent heat of fusion of lead, L= 25 J/g

mass of liquid lead, m = 3.0g

The heat given off is calculated as;

H = Lm

Where;

H is the quantity of heat given off

H = 25 x 3

H = 75 J.

Therefore, the heat given off is 75 J.

5 0
3 years ago
Nitrous oxide is used as an anesthetic. The pressure on 2.50 L of N2O changes from 105 kPa to 40.5 kPa. If the temperature does
Alchen [17]
。。。。。。。。。。。。。。。。。。。。。。。。

4 0
3 years ago
Which of the following is NOT an acceptable unit for reporting gas pressure?
Arada [10]

Answer:

mL

Explanation:

Atmospheres (atn), Torr, and mm of Hg are all units of pressure but mL is a unit of volume, not pressure.

5 0
3 years ago
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