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4 years ago

What ketones would be formed from the acid-catalyzed hydration of 3-heptyne?

Chemistry

1 answer:

blagie [28]4 years ago

6 0

The answer would be heptan-3-one and heptan-4-one.

The acid-catalyzed hydration of a balanced alkyne gives a ketone.

R-C≡C-R + H₂O → R-CH₂-CO-R

If the alkyne is uneven, you get a combination of two ketones, since the O can increase to either of the alkyne C atoms.

R-C≡C-R' + H₂O → R-CH₂-CO-R' + R-CO-CH₂-R'

So, for CH₃CH₂CH₂-C≡C-CH₂CH₃, the products are

CH₃CH₂CH₂-CH₂-CO-CH₂CH₃ and CH₃CH₂CH₂-CO-CH₂-CH₂CH₃

Their terms are heptan-3-one and heptan-4-one,

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What is the percentage of water in hydrated calcium chloride

earnstyle [38]

Answer:

24.5%

Explanation:

You just add up the atomic masses.

Ca - 40.078

Cl2 - 35.4527 x 2 = 70.9054

------ 110.9834

H4 - 1.00794 x 4 = 4.03176

O2 - 31.9998

------ 36.03056

TOTAL - 147.01396

So the water is 36.03056/147.01396 = .245082576 but that is only accurate to three decimals (because the mass of Ca was only given to three decimals) so we write .245 and that is 24.5%

This is not my answer but I found it on Yahoo answers and it was answered by Anonymous.

8 0

3 years ago

Read 2 more answers

A 52 gram sample of an unknown metal requires 714 Joules of energy to heat it from

ratelena [41]

Answer: Approximately $0.267 \frac{\text{J}}{\text{g}^{\circ}\text{C}}$

===================================================

Work Shown:

We have the following variables

Q = 714 joules = heat required
m = 52 grams = mass
c = specific heat = unknown
$\Delta t$ = 82-30.5 = 51.5 = change in temperature

note: the symbol $\Delta$ is the uppercase Greek letter delta. It represents the difference or change in a value.

Apply those values into the formula below. Solve for c.

$Q = m*c*\Delta t\\\\714 = 52*c*51.5\\\\714 = 52*51.5*c\\\\714 = 2678*c\\\\2678*c = 714\\\\c = \frac{714}{2678}\\\\c \approx 0.26661687826737\\\\c \approx 0.267\\\\$

The specific heat of the unknown metal is roughly $0.267 \frac{\text{J}}{\text{g}^{\circ}\text{C}}$

3 0

3 years ago

Does water mess up carbon dating?

xenn [34]

Answer:

THE hard-water effect is a recognized source of error in radiocarbon dating. It causes ages to be over-assessed and arises when the material to be dated, such as mollusc shell or plant, synthesizes its skeleton under water and so uses bicarbonate derived in part from old, inert sources.

https://www.nature.com/articles/240460a0#:~:text=THE%20hard%2Dwater%20effect%20is,part%20from%20old%2C%20inert%20sources.

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3 years ago

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Titration is a type of experiment that can be performed to investigate a neutralization reaction. The equivalence point is when

patriot [66]

Answer:

The volume of the potassium hydroxide solution was 164.1 mL

Explanation:

In the equivalence point of a titration between an acid an a base, the moles of H⁺ are equal to the moles of OH⁻.

In the case of potassium hydroxide (KOH) and hydrochloric acid (HCl), an equation that represents the equivalence point would be:

$V_{KOH}*M_{KOH}= V_{HCl}*M_{HCl}$

Using that equation and the data given in the problem, we can calculate the volume of potassium hydroxide:

$0.723M* V_{KOH}= 79.1mL*1.50 M\\V_{KOH}=\frac{79.1mL*1.50 M}{0.723 M} \\V_{KOH}=164.1mL$

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3 years ago

Ammonium hydrogen sulfide (NH4HS) can

Maurinko [17]

Answer: Keq=[NH3][H2S]

Explanation:

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3 years ago