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3 years ago

A) accelerated upward. B) slowed and then stopped. C) moved at a constant velocity. D) increased its speed rapidly.

Chemistry

1 answer:

djverab [1.8K]3 years ago

3 0

Answer:

A because the line is showing accelerated upward.

Explanation:

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Water is a polar molecule, meaning the covalent bonds in it share electrons unequally. They spend more time around the oxygen, making it positive and the hydrogens negative. This helps water stick to surfaces, a property called adhesion. The hydrogens of one molecule are also attracted to the oxygens of another. This is called cohesion, and it helps water form droplets

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3 years ago

Acetic acid (HC2H3O2, Ka=1.8x10^-5) is a weak acid. Calculate the pH of an aqueous solution of .25M acetic acid.

tensa zangetsu [6.8K]

Answer: The pH of an aqueous solution of .25M acetic acid is 2.7

Explanation:

$HC_2H_3O_2\rightarrow H^+C_2H_3O_2^-$

cM 0 0

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

So dissociation constant will be:

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

Give c= 0.25 M and $\alpha$ = ?

$K_a=1.8\times 10^{-5}$

Putting in the values we get:

$1.8\times 10^{-5}=\frac{(0.25\times \alpha)^2}{(0.25-0.25\times \alpha)}$

$(\alpha)=0.0084$

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

$[H^+]=0.25\times 0.0084=0.0021$

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

$pH=-log[0.0021]=2.7$

Thus pH is 2.7

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How many valence electrons do alkali metals have?

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1 valence electron in alkali metals.

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3 years ago

Which action by the British government was

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The answer is (4) taxing the colonies without representation in Parliament

This set off the Revolutionary War, and the slogan "no taxation without representation" became famous.

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By studying fossils, scientists have learned that A. Both animals and plants have changed over time. B. Plants have changed over

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Explanation:

Because plants and animals go through adaptations.

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3 years ago

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