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Dmitrij [34]
3 years ago
7

Which of the following changes of state is exothermic evaporation? melting? or freezing?

Chemistry
1 answer:
Dvinal [7]3 years ago
6 0
 EXOTHERMIC change<span> from the gaseous to the liquid </span>state<span> of matter.

</span>
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The first attempt to classify the elements was made by newlands true or false​
Keith_Richards [23]

Answer:

True. An English scientist by the name of John Newlands tried to classify the elements in a unique manner. He first started by arranging all the elements in a ascending order according to their atomic weights.

8 0
3 years ago
Calculate the heat (in calories) released when 115 g of CHCl3 changes from a liquid to a solid at
Alexandra [31]

Answer:  8855 Joules energy is released when 115 g of CHCl_3 changes from a liquid to a solid at  its freezing point.

Explanation:

Latent heat of freezing is the amount of heat released to convert 1 mole of  liquid to solid at atmospheric pressure.

Amount of heat released to freeze 1 gram of CHCl_3 = 77 J/g

Mass of CHCl_3 given = 115 gram

Heat released when 1 g of CHCl_3 is freezed = 77 J

Thus Heat released when 115 g of CHCl_3 is freezed =\frac{77}{1}\times 115=8855J

Thus 8855 Joules energy is released when 115 g of CHCl_3 changes from a liquid to a solid at  its freezing point.

4 0
3 years ago
Why is a sandy shore hot on a summer day?
kramer

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7 0
2 years ago
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A container has a volume of 2.79 L and a pressure of 5.97 atm. If the pressure changes to 1460 mm Hg, what is the container’s ne
maw [93]

Answer:

8.68 L is the new volume

Explanation:

You use Boyle's law for this.

P_{1}V_{1}=P_{2}V_{2}

P_{1} = first pressure

P_{2} = second pressure

V_{1} = first volume

V_{2} = second volume

Convert pressure from atm to mmHg (use same units):

5.97 x 760 = 4537.2 -> 4.54 x 10³

...maintain 3 significant figures in calculation, and round as needed...

(4.54 x 10³ mmHg)(2.79 L) = (1460 mmHg)(V_{2})

(4.54 x 10³ mmHg)(2.79 L) / (1460 mmHg) = V_{2} = 8.68 L

Hope this helps :)

5 0
3 years ago
Write a structural formula for 1-pentanol, the alcohol derived from pentane, by making a substitution on one of the carbon atoms
DedPeter [7]
To yield an alcohol from an alkane, one reaction could be from alkyl halide through hydrolysis reaction. The alkyl halide should be pentyl chloride. When you add water to it, the OH⁻ ion will replace Cl to make 1-pentanol, while the Cl⁻ ion binds with H⁺ to form HCl. The main product is pentanol, while the by-product is HCl.
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3 years ago
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