Which of the following is an

Chemistry

2 answers:

soldi70 [24.7K]2 years ago

8 0

Answer:

B. rubbing your hands together to get warm,

Explanation:

Rubbing your hands together warms them by converting work into thermal energy.

Hope it helps ;)

Leokris [45]2 years ago

5 0

Answer:

I think its A

Explanation:

Because a lamp has a lightbulb and it produces wasted heat and is thermal energy

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A ________ is an electric circuit that produces a magnetic field

aksik [14]

I believe it would be D. Electromagnet. It's been a while since I've done this stuff, tho. Hope this helps!!!! :)

5 0

2 years ago

Draw the alkane formed when 4,5,5-trimethyl-1-hexyne is treated with two equivalents of hbr.

AveGali [126]

<h3>Answer:</h3>

The Alkane formed is 5,5-dibromo-2,2,3-trimethylhexane. as shown below in attached scheme (Green Color).

<h3>Explanation:</h3>

Alkynes like Alkenes undergo <em>Electrophillic Addition Reactions</em>. The reaction given is a two step reaction. In step 1, the Alkyne adds first equivalent of HBr obeying <em>Markovnikov's rule</em> (i.e. Bromine will add to carbon containing less number of hydrogen atoms) and forms <em>2-bromo-4,5,5-trimethylhex-1-ene</em>. In step 2, the alkene formed in first step (2-bromo-4,5,5-trimethylhex-1-ene) undergoes addition reaction with the second equivalent of HBr via Markovnikov's rule to produce <em>5,5-dibromo-2,2,3-trimethylhexane</em>.

The scheme is attached below, Blue color is assigned to starting Alkyne, Red color is assigned to intermediate Alkene and Green color is assigned to product Alkane respectively.