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mr_godi [17]
3 years ago
15

Consider the following two isomeric alkenes. The first isomer is a mono substituted alkene, while the second isomer is a disubst

ituted alkene. We might expect the second isomer to be more stable, yet heats of combination for these two compounds indicate that the first isomer is more stable. Offer an explanation.
Chemistry
1 answer:
kenny6666 [7]3 years ago
7 0

Explanation:

Since both the alkenes contain a 4 membered ring, both will contain ring strain.

We know that ring strain decreases the stability of the compound. Hence higher the ring strain, lower will be stability.

First alkene contains only sp3 carbons in the ring. Hence

ring starin = (109.50 - 900) =9.75 0 around each carbon

Similarly in the second alkene, ring contains two sp2 carbons and 2 sp3 carbons

Hence angle strain forsp2 carbons = (120 0 - 90 0) / 2 = 15 0

Therefore in the second alkene, due to higher angle strain around sp2 carbon atoms, the compound is less stable than the first alkene.

Hence first alkene is more stable than the the second one.

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A 10 pound block of lead-210 has a half-life of 22 years. What percentage of the block still contains lead-210 after 60 years?
avanturin [10]

Answer:

The percentage of the block contains 15% after 60 years.

Explanation:

Step 1: Formula for half-life time

To calculate the half-life time we will use the following formula:

At = A0 * 1/2 ^(x/t)

With At = the quantity after a time t

A0 = The quantity at time t = 0 (start)

x = time in this case = 60 years

t= half-life time = 22 years

Step 2: Calculate the percentage after 60 years

In this case: after 60 years the percentage will be

A0= 10 * 1/2 ^(60/22)

A0 = 1.5

A0 / At  = 1.5 /10 = 0.15

0.15 *100% = 15 %

The percentage of the block contains 15% after 60 years.

7 0
3 years ago
Some water released 7800 J of energy when cooled from 78°C to 33°C. What was the mass of the water?
Karo-lina-s [1.5K]

Answer:

-41. 47

Explanation:

m = q / Cp x T

m = Mass

q = Energy (or joules)

Cp = Heat Capacity

T = Change in Temperature

Water's heat capacity is always 4.18.

This is the formula you'll need for change in temperature:

Final - Initial

So, 33 - 78 = -45

m = 7800 / 4.18 x -45

= -41.47

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2 years ago
With proper illustration, show the bond<br>formation in CO2 and what type of bond is involved​
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Explanation:

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Is wine a pure substance
prohojiy [21]

Answer:

yes it is

Explanation:

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4 years ago
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