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Tamiku [17]
3 years ago
5

22. What is a comet?

Chemistry
1 answer:
Lunna [17]3 years ago
4 0

Answer:

A ball of ice blasted into outer space

Explanation:

It is a ball of ice that is going so fast it leaves a "tail"

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Give the expected organic product when 3-phenylpropanoic, PhCH2CH2COOH , is treated with NaOH, H20 .If more than one product is
Ann [662]

Answer:

when 3-phenylpropanoic, PhCH₂CH₂COOH , is treated with NaOH, H₂0 it produce sodium salt of 3 - phenylpropanoic acid with water as a major product.

Explanation:

Carboxylic acid when treated with a base like NaOH or KOH gives carboxylate ion because H⁺ from acid reacts with OH⁻ from base gives H₂0 and salt of sodium carboxylate.

The mechanism of the above reaction given below

7 0
3 years ago
Which of the following parts of the electromagnetic spectrum have longerwavelengths than those witnessed in the visible spectrum
Vikentia [17]
Infrared radiation is the only one with wavelengths longer than the wavelengths of visible light. X-rays and gamma rays are known to be shorter than visible wavelengths, and cosmic waves are only high energy particles. I hope this helped. And sorry about the late answer...
3 0
3 years ago
Read 2 more answers
A certain liquid has a normal boiling point of and a boiling point elevation constant . A solution is prepared by dissolving som
Andrews [41]

The given question is incomplete. The complete question is as follows.

A certain liquid has a normal boiling point of 124.2^{o}C and a boiling point elevation constant k_{b} = 0.62 ^{o}C kg mol^{-1}. A solution is prepared by dissolving some sodium chloride (NaCl) in 6.50 g of X. This solution boils at 127.4^{o}C. Calculate the mass of NaCl that was dissolved. Round your answer to significant digits.

Explanation:

As per the colligative property, the elevation in boiling point will be as follows.

     

T = boiling point of the solution =

T_{o} = boiling point of the pure solvent = 124.2^{o}C

K_{b} = elevation of boiling constant = 0.62 ^{o}C kg mol^{-1}

We will calculate the molality as follows.

     molality = \frac{\text{maas of solute}}{\text{molar mass of solute}} \times \frac{1000}{\text{mass of solvent in g}}

i = vant hoff's factor

As NaCl is soluble in water and dissociates into sodium and chlorine ions so i = 2.

Putting the given values into the above formula as follows.  

    T - T_{o} = i \times K_{b} \times \text{molality of solution}

  (127.4 - 124.2)^{o}C = 2 \times 0.62 \times \frac{m}{60} \times \frac{1000}{650}

                  m = 100 g

Therefore, we can conclude that 100 g of NaCl was dissolved.

3 0
3 years ago
Explain why HCl can be a strong electrolyte, but a dilute HCl solution can be a poor conductor?
zloy xaker [14]

Answer:

Because as the concentration is diminished, the capacity to transfer electricity is diminished as well.

Explanation:

Hello!

In this case, since electrolytes are substances that are able to conduct the electricity in aqueous media (solutions in which water is the the solvent) because they have the capacity to form ions with both positive and negative charges, due to the fact that HCl is a strong acid, we notice it is fully ionized in solution and therefore it is a strong electrolyte. However, when the concentration is diminished, we can notice that strength is diminished as well because less ions will have the capacity to transfer the electricity and therefore it'd become a poor conductor or weak electrolyte.

Best regards!

3 0
3 years ago
Choose the statement that best describes the effects of a higher or lower pH on enzymes.
matrenka [14]
<h3>Answer:</h3>

Higher or lower pH affect the structure of the enzyme and reduces the enzyme activity.

<h3>Explanation:</h3>
  • Enzymes are biological molecules that speed up the rate of chemical reactions.
  • Enzyme activity is affected by several factors which include temperature, pH, and enzyme inhibitors.
  • Enzymes work on specific molecules known as substrates. They are substrate-specific.
  • Enzymes work best at optimum pH and temperature.
  • Higher or lower pH affects the structure and charges of an enzyme thus affecting enzyme activity.
  • Lower temperature deactivates the enzymes while higher temperatures denature the enzymes.
8 0
4 years ago
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