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FrozenT [24]
3 years ago
6

Answer pls ASAPPP 50 pointsss!!

Chemistry
2 answers:
Over [174]3 years ago
6 0

Answer:

One

Explanation:

 One Chemical changes-It was when he toasted the bread. The heat changed the bread so that it has the crust on the outside

amm18123 years ago
5 0

Answer:

There should only be one chemical reaction, this is because toasting the bread is not only using heat, but you cannot untoast the bread, and also theres a reaction with the amino acids and sugar in bread when it's cooked. I hope this helps you! :)

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A mixture of nitrogen and neon gas is compressed from a volume of to a volume of , while the pressure is held constant at . Calc
Mamont248 [21]

Answer:

-266 kJ

Explanation:

There is some info missing. I think this is the original question.

<em>A mixture of nitrogen and neon gas is expanded from a volume of 53.0 L to a volume of 90.0 L, while the pressure is held constant at 71.0 atm. Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.</em>

<em />

Given data

Initial volume = 53.0 L

Final volume = 90.0 L

Pressure = 71.0 atm

We can find the work (w) associated with the expansion of the gaseous mixture using the following expression.

w = - P × ΔV = - 71.0 atm × (90.0 L - 53.0 L) = -2.63 × 10³ atm . L

w = -2.63 × 10³ atm . L × (101.3 J/ 1 atm . L) = -2.66 × 10⁵ J = -266 kJ

The negative sign means that the system does work on the surroundings.

7 0
3 years ago
Consider these compounds:
Gnom [1K]

Explanation:

If we compare its solubility products without any calculation then, Magnesium hydroxide is more soluble than compound A and C. Magnesium hydroxide is less soluble than compound D.

- The solubility product of magnesium hydroxide and zinc carbonate is same so it is not possible to determine whether it is more or less soluble than compound B

6 0
3 years ago
%:
ser-zykov [4K]

Answer:

I don't know the answer of this question.

8 0
3 years ago
Rank these compounds by their expected boiling point? CH4 CH3Cl CH3OH? Lowest to highest; 10+ for the best explanation. Thank yo
docker41 [41]
Methane, CH4, would have the lowest boiling point among the three since it has the lowest number of carbon and has no functional groups. Methanol would have the highest boiling point since it has a functional group which contains hydrogen bonding which much stronger than the one in CH3Cl. Hope this helps.<span />
3 0
3 years ago
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An isotope of an element has a mass number of 129 and it has 74 neutrons. How many
Viktor [21]

Answer:

Explanation:

tiene 74 protones

6 0
3 years ago
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