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hoa [83]
2 years ago
12

Which of the following are characteristics of ionic compounds?

Chemistry
1 answer:
Rasek [7]2 years ago
8 0

Answer:

Ionic compounds have high melting points.

Ionic compounds are hard and brittle.

Ionic compounds dissociate into ions when dissolved in water.

Solutions of ionic compounds and melted ionic compounds conduct electricity, but solid materials do not.

Explanation:

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Hexane and heptane are miscible with each other in all proportions. In making a solution of them, is the entropy of the system i
Damm [24]

Answer: Option (a) is the correct answer.

Explanation:

A miscible solution is defined as the one in which two or more than two components are soluble with each other.

So, when hexane is added to heptane then both of them will mix with each other and hence they are miscible. This mixing will lead to formation of more number of ions into the solution as a result, more will be the disorder present in the solution.

As entropy is the degree of randomness present.

Hence, we can conclude that a solution of hexane and heptane will lead to an increase in entropy.

8 0
3 years ago
About which of the following can you ask scientific questions
Stels [109]
<h2>Answer:</h2>

Scientific questions are question which are solved involving experiments, observations, or surveys.

Like, Is cancer caused by uncontrolled cell division.

<h3>Explanation:</h3>

Scientific questions are always testable questions. They can be solved by using scientific techniques like PCR, titration etc.

Here the given question in the example can be tested, by making the observations of the cell division of the cancer patients. Then by inducing uncontrolled cell division into normal cells to look for the effect of cell division on cancer.

The questions like, "is sadness can be controlled by talking?" is not a scientific question.

8 0
3 years ago
Alpha helices are a type of secondary structure in proteins. What is the length of a 27.0 kDa single‑stranded α‑helical protein
iogann1982 [59]

Answer : The  length of protein will be, 36.8 A⁰

Explanation :

First we have to calculate the amino acid residue.

\text{Amino acid residue}=\frac{\text{Length of single strand of protein}}{\text{Mean residue mass}}

Given:

Length of single strand of protein = 27.0 kDa

Mean residue mass = 110 Da

\text{Amino acid residue}=\frac{27.0kDa}{110Da}=\frac{27000Da}{110Da}=245.4

Now we have to calculate the number of turns in protein.

\text{Number of turns in protein}=\frac{\text{Amino acid residue}}{3.6\text{amino acid per turn of the alpha-helix}}

As there are 3.6 amino acid per turn of the alpha-helix.

\text{Number of turns in protein}=\frac{245.4}{3.6}=68.17

Now we have to calculate the length of the protein.

\text{Length of protein}=\text{Number of turns in protein}\times \text{Length of each turn}

As, we know that the length of each turn = 0.54 A⁰

\text{Length of protein}=68.17turns\times 0.54\AA=36.8\AA

Thus, the length of protein will be, 36.8 A⁰

8 0
3 years ago
What type of compound is calcium oxide
mrs_skeptik [129]
CaO ( calcium oxide) is a basic oxide.


6 0
3 years ago
How do I solve these equations?
liq [111]
What equations ? I would like to help
3 0
3 years ago
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