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Paha777 [63]
3 years ago
7

PLEASE HELP!!!! WILL GIVE BRANLIEST!!

Chemistry
2 answers:
NISA [10]3 years ago
6 0

Answer:

help with what...

..

........

Korvikt [17]3 years ago
3 0
Phenolphthalein is in pink colour. it will turn colourless if the solution become neutral. the lemon is acidic. so it will not change colour. please mark me brainliest
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What is the sum of 16+ -20?
mr Goodwill [35]

Answer:

-4

Explanation:

PLz give me brainliest I worked hard thank u

6 0
2 years ago
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Which process is expected to have an increase in entropy?
olganol [36]

Answer: Option (B) is the correct answer.

Explanation:

Degree of randomness of the molecules of a substance is known as entropy. More is the kinetic energy between the molecules of a substance more will be the degree of randomness.

Therefore, when a substance is present in a gaseous state then it has the maximum entropy. In liquid state, molecules are closer to each other so, there is less randomness between them.

On the other hand, in solid state molecules are much more closer to each other as they arr held by strong intermolecular forces of attraction. Therefore, they have very less entropy.

  • When liquid water is formed from gaseous hydrogen and oxygen molecules then gas is changing into liquid. So, there is decrease in entropy.
  • When N_{2}O_{4} decomposes then the reaction will be as follows.

            N_{2}O_{4} \rightarrow 2NO_{2}

Since, 1 mole is producing 2 moles. This means that degree of randomness is increasing as both the molecules are present in gaseous form.

  • In formation of a precipitate, aqueous solution is changing into solid state. Hence, degree of randomness is decreasing.
  • Rusting of iron also leads to the formation of solid as it forms Fe_{2}O_{3}.xH_{2}O.

Thus, we can conclude that decomposition of N_{2}O_{4} gas to NO_{2} gas is the process that is expected to have an increase in entropy.

4 0
3 years ago
HELP PLLZZZ
Scorpion4ik [409]

Answer:

Abrasion

Explanation:

Here's an example, strong winds on a beach where some rocks are cause the sand to rub against the rocks, causing heat and eventually crack and destroy the rock. The ice of glaciers can also break down rocks when rocks are frozen inside it, and that's cooling.

8 0
2 years ago
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Help I need an answer today
Ivahew [28]
Here you are! I hope it helps, and also for the ones I put a red ‘x’ it depends on how you round it.

5 0
3 years ago
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2. Determine the total pressure of a gas mixture that contains O2, N2, and He, if the partial
Burka [1]

Answer:

978mmHg

Explanation:

The total pressure of a gas mixture is defined as the sum of the pressure of each gas in the mixture.

If the mixture of gases you have 200mmHg for O₂, 350mmHg for N₂ and 428mmHg for He, total pressure of the mixture is:

200mmHg + 350mmHg + 428mmHg = <em>978mmHg</em>

4 0
3 years ago
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