3 years ago

What is a group of electrons orbiting at roughly the same distance from the nucleus

Chemistry

1 answer:

Alex Ar [27]3 years ago

5 0

A shell of electrons.

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Mercury thermometers work because mercury ____ when it is warmed

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Mercury expands when it is heated. This process is called thermal expansion.

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2 years ago

. The speed of a sound in air is 343 m/s. The sound wave has a frequency of 436 HZ and its period is 0.0023 s. What is the wavel

Taya2010 [7]

Answer: 0.79

Explanation:

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2 years ago

A 0.15 m solution of chloroacetic acid has a ph of 1.86. What is the value of ka for this acid?

dem82 [27]

Answer: $1.67\times 10^{-3}$

Explanation:

$ClCH_2COOH\rightarrow ClCH_2COO^-+H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Given: c = 0.15 M

pH = 1.86

$K_a$ = ?

Putting in the values we get:

Also $pH=-log[H^+]$

$1.86=-log[H^+]$

$[H^+]=0.01$

$[H^+]=c\times \alpha$

$0.01=0.15\times \alpha$

$\alpha=0.06$

As $[H^+]=[ClCH_2COO^-]=0.01$

$K_a=\frac{(0.01)^2}{(0.15-0.15\times 0.06)}$

$K_a=1.67\times 10^{-3]$

Thus the vale of $K_a$ for the acid is $1.67\times 10^{-3}$

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2 years ago

In the boxes below, draw three particle diagrams representing the sample

Alexxandr [17]

Answer: 2

Explanation: bencause they are changing

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2 years ago

Which of the following are correct for zero-order reactions?

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Answer:

The answer is "Choice A and Choice B"

Explanation:

The Zero-Order reactions are usually found if a substrate, like a surface or even a catalyst, is penetrated also by reactants. Its success rate doesn't depend mostly on the amounts of the various reaction in this reaction.

Let the Rate = k

As $\frac{dx}{dt} \ rate\ \ K_0$ doesn't depend on reaction rate, a higher reaction rate does not intensify the reaction.

By the rate $k_0 =\frac{dx}{dt},$ the created based and the reaction rate is about the same.

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2 years ago