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Artist 52 [7]
2 years ago
9

What is the use of the crystallisation process?

Chemistry
2 answers:
ioda2 years ago
5 0
  •  to obtain pure salt from seawater. 
  • in order to obtain pure crystals of a substance from an impure mixture. 
  • obtain pure alum crystals from an impure alum.

joja [24]2 years ago
4 0

<em><u>to</u></em><em><u> </u></em><em><u>separate</u></em><em><u> </u></em><em><u>pure</u></em><em><u> </u></em><em><u>salt</u></em><em><u> </u></em><em><u>from</u></em><em><u> </u></em><em><u>salt</u></em><em><u> </u></em><em><u>water</u></em>

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Select the correct answer. Which substance is made of polymers? A. marble B. protein C. salt D. steel
Greeley [361]

Answer:

the answer is B proteins

Explanation:

brainliest pls

4 0
3 years ago
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What is the density of a substance with a mass of 1.8 kg and a volume of 0.2 L?
horrorfan [7]

Answer:

<h3>The answer is 9.0 kg/L</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}  \\

From the question

mass = 1.8 kg

volume = 0.2 L

We have

density  =  \frac{1.8}{0.2}  \\

We have the final answer as

<h3>9.0 kg/L</h3>

Hope this helps you

5 0
3 years ago
Consider the following equilibrium systems: A⇌2B ΔH o =20.0 kJ/mol Reaction 1 A+B⇌C ΔH o =−5.4 kJ/mol Reaction 2 A⇌B ΔH o =0.0 k
galina1969 [7]

Answer:

Reaction 1: Kc increases

Reaction 2: Kc decreases

Reaction 3: The is no change

Explanation:

Let us consider the following reactions:

Reaction 1: A ⇌ 2B ΔH° = 20.0 kJ/mol

Reaction 2: A + B ⇌ C ΔH° = −5.4 kJ/mol

Reaction 3: 2A⇌ B ΔH° = 0.0 kJ/mol

To predict what will happen when the temperature is raised we need to take into account Le Chatelier Principle: when a system at equilibrium suffers a perturbation, it will shift its equilibrium to counteract such perturbation. This means that <em>if the temperature is raised (perturbation), the system will react to lower the temperature.</em>

Reaction 1 is endothermic (ΔH° > 0). If the temperature is raised the system will favor the forward reaction to absorb heat and lower the temperature, thus increasing the value of Kc.

Reaction 2 is exothermic (ΔH° < 0). If the temperature is raised the system will favor the reverse reaction to absorb heat and lower the temperature, thus decreasing the value of Kc.

Reaction 3 is not endothermic nor exothermic (ΔH° = 0) so an increase in the temperature will have no effect on the equilibrium.

8 0
3 years ago
This chemical equation represents the burning of methane, but the equation is incomplete. What is the missing coefficient in bot
Zolol [24]
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H=4>>Y=2
C=1 +H=4 +O=? = C=1 +O=(2+2) +H=4
C=1 +H=4 +O=4 = C=1 +O=4 +H=4
O=4>>X=2
CH4+(2)O2 =CO2 +(2)H2O

6 0
3 years ago
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All of the alkali earth metals, Group 2, have two valence electrons. Which of these would represent the oxidation number of the
chubhunter [2.5K]
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So the correct answer is C) +2
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3 years ago
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