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GrogVix [38]
3 years ago
12

Why does a star expand into a red giant?​

Chemistry
1 answer:
devlian [24]3 years ago
7 0

Answer:

"Hydrogen is still available outside the core, so hydrogen fusion continues in a shell surrounding the core. The increasingly hot core also pushes the outer layers of the star outward, causing them to expand and cool, transforming the star into a red giant."

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"benzyl ethyl ether reacts with concentrated aqueous hi to form two initial organic products (a and b). further reaction of prod
ahrayia [7]

Answer:

See below.  

Step-by-step explanation:

Ethers react with HI at high temperature to produce an alky halide and an alcohol.

R-OR' + HI ⟶ R-I + H-OR'

<em>Benzylic ethers</em> react by an Sₙ1 mechanism by forming the stable benzyl cation.

  1. PhCH₂-OR + HI ⟶ PhCH₂-O⁺(H)R + I⁻    Protonation of the ether
  2. PhCH₂-O⁺(H)R  ⟶ PhCH₂⁺ + HOR          Sₙ1 ionization of oxonium ion
  3. PhCH₂⁺ + I⁻       ⟶ PhCH₂-I                     Nucleophilic attack by I⁻  

If there is excess HI, the alcohol formed in Step 2 is also converted to an alkyl iodide:

ROH +HI ⟶ R-I + H-OH

Thus, benzyl ethyl ether reacts to form benzyl iodide (a) and ethanol (b).

The ethanol reacts with excess HI in an Sₙ2 reaction to form ethyl iodide (c).

4 0
4 years ago
How do you separate sand and zinc?
taurus [48]

Answer:

By using magnet.

Explanation:

Put sand and zinc in the bowl.

Take a magnet an bring it close to the bowl.

The zinc from the sand will be attracted towards the magnet.

In this way it will be separated.

8 0
3 years ago
You are analyzing a compound in a laboratory. you find that it is made up of carbon, hydrogen, and oxygen in a ratio of two hydr
kotegsom [21]
<span>Carbohydrates because carbohydrate is a molecule that contains carbon, hydrogen and oxygen usually in a ratio of two hydrogen atoms for each carbon atom. Carbohydrates are also known as saccharides or carbs.They are basically sugar or starches.</span><span />
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PLEASE ANSWER QUICK AND I MARK U BRAINLIEST!
kozerog [31]

Answer: Areas of high and low pressure are caused by ascending and descending air. As air warms it ascends, leading to low pressure at the surface. As air cools it descends, leading to high pressure at the surface. So it depends on how cold or hot it is. If there is sun and it's very hot the ocean has higher pressure than land. But if it's cold at night then the land has higher pressure then the water

7 0
3 years ago
Why is it important to dispose of wastes from nuclear power plants carefully? A) The wastes cause the greenhouse effect. B) The
Vikki [24]
I would say its B. very sorry if I am wrong.
4 0
3 years ago
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