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Inga [223]
3 years ago
7

which element is the most electronegative out of the following K Mn Br WILL MARK BRAINLIEST!

Chemistry
1 answer:
SashulF [63]3 years ago
8 0
The correct answer is:  [C]:  "Br"  {"bromine"} .
_______________________________________________________
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C.) Is heating of cobalt (ii) chloride crystals a chemical change or a physical change (Imk)​
miv72 [106K]

Answer: Heating the hydrated forms of cobalt chloride reverses the reactions above, returning cobalt chloride to the blue, water-free, or anhydrous, state. Water is "liberated" in these reactions, known as dehydration reactions.

Explanation:

8 0
3 years ago
Without doing any calculations, match the following thermodynamic properties with their appropriate numerical sign for the follo
siniylev [52]

Answer:

∆H > 0

∆Srxn <0

∆G >0

∆Suniverse <0

Explanation:

We are informed that the reaction is endothermic. An endothermic reaction is one in which energy is absorbed hence ∆H is positive at all temperatures.

Similarly, absorption of energy leads to a decrease in entropy of the reaction system. Hence the change in entropy of the reaction ∆Sreaction is negative at all temperatures.

The change in free energy for the reaction is positive at all temperatures since ∆S reaction is negative then from ∆G= ∆H - T∆S, we see that given the positive value of ∆H, ∆G must always return a positive value at all temperatures.

Since entropy of the surrounding= - ∆H/T, given that ∆H is positive, ∆S surrounding will be negative at all temperatures. This is so because an endothermic reaction causes the surrounding to cool down.

3 0
3 years ago
How many moles are equal to 1.20 x 1024 atoms of sulfur?
kakasveta [241]
1.20x1,024=1228.8 this is your answer.
hope that this helps.
8 0
3 years ago
Read 2 more answers
Which is true about sugar dissolving in water?
AfilCa [17]
Sugar is the solute since it is the thing that is being dissolved.
And the water is the solvent since it is the thing that contains the solute.
 
7 0
3 years ago
Why is it important to compare the positive and negative test results with those of known compounds?
maks197457 [2]

It is important to compare the positive and negative test results with those of known compounds as positive results indicate the presence of that known compound and negative results indicate the absence of that compound which is used for reference.

<h3>What is qualitative analysis?</h3>

Qualitative chemical analysis is a method to determine the chemical composition of a sample.

There are two types of qualitative analysis:

  • Organic Qualitative analysis: It helps in determining the chemical bonds and functional groups in a sample
  • Inorganic qualitative analysis: It helps in determining the ions in the given sample

There are seven ways to analyze a sample qualitatively, which are

  • Change in color
  • Flame test
  • Distillation
  • Extraction
  • Precipitation
  • Chromatography
  • Spectroscopy

A reference compound is always used to which results are compared.

A Positive result indicates that the reference compound is present in the sample whereas a negative result indicates that the reference compound is absent in the given sample.

Learn more about qualitative analysis:

brainly.com/question/1779681

#SPJ4

5 0
1 year ago
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