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Reil [10]
3 years ago
11

Is dissolving salt a chemical change or physical change and why?

Chemistry
1 answer:
Firlakuza [10]3 years ago
4 0

It's a physical change because the composition of the salt hasn't change. Only the change in substance/form has occured. To tell if something has undergone physical change is:

• Melting

• Boiling

• Freezing

• Condensing

• Breaking

• Bending

• Dissolving

• Molecules can change motion and proximity

To tell if something changed chemically:

• Molecules rearrange with other molecules to make new substance

• Can be production of flames

• Color change

• Bubbling/fizzing

• Temp. change

• change in composition


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The textbook procedure is asking you to dissolve 1 g of 3-nitrophthalic acid in hydrazine and only then to add the triethylene g
Ivenika [448]

Answer:

The reaction between 3-nitrophthalic acid and hydrazine is highly vigorous. Therefore, the answer is <em>option C</em>.

Explanation:

Triethylene glycol is a high-boiling solvent which necessarily used to contain the synthesis of luminol, which is obtained from the reaction between 3-nitrophthalic acid and aqueous hydrazine. However, this reaction is carried out at a very high temperature, the prior addition of triethylene glycol can allow sufficient reflux for the required completion time without evaporating the solvent fully.

Furthermore, Luminol is an organic compound used to detect metallic ions in Biology. For example, it is used to detect blood traces in forensic investigations.

7 0
3 years ago
at 30°C 80 g of sodium nitrate is dissolved in 100 g of water is a solution saturated and unsaturated or supersaturated
soldi70 [24.7K]

Answer:

c

Explanation:

thats the answer

4 0
4 years ago
. The normal boiling point for oxygen is at 800 torr and – 193°C, the most likely state of a sample of pure oxygen is
atroni [7]

Answer:

Gaseous at standard conditions.

Explanation:

Hello,

In this case, for the given normal boiling point of oxygen, we can notice those are conditions far away from the standard conditions which are 25 °C. In such a way, since the standard temperature is by far higher than the normal boiling point, the most likely state of a sample of pure oxygen would be gaseous since the molecules will move based on the kinetic theory of gases due to the  relatively high temperature which make them be separated and moving all around.

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3 0
3 years ago
Why is the solubility of khp in water greater than many fatty acids with six or more carbons?
Georgia [21]
Solubility of khp in water is greater than many fatty acids because khp is a polar substance while fatty acids are non-polar. Khp has positive and negative charges which help it to dissociate into ions when it dissolves in water. Fatty acids on the other hand contain long unbranched hydrocarbons with one end having a carboxylic acid group. This make water molecules to repel from them because no part of the fatty acid molecules have any charge.
3 0
4 years ago
What is the molarity of a solution that contains 2.634 mol KCI in 25.2 L solution?O a. 0.105O b. 0.00141O c. 7.73O d. 105
Vikentia [17]

Explanation:

To solve this question, we need to use the following formula:

M = n/V

So:

M = ??

n = 2.634 mol

V = 25.2 L

M = 2.634/25.2

M = 0.105 mol/L

Answer: a. 0.105

4 0
1 year ago
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