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3 years ago

9

List 2 of the important properties of gases.

1 answer:

Delicious77 [7]3 years ago

6 0

1. They expand to fill their containers
2. Their molecules move the most rapidly

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Is melting an ice cube on your hand a chemical or physical and why? Need reasons!!

xenn [34]

Physical, because the ice is only changing it's state. It's not changing to a new substance.

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2 years ago

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8.8 Why do esters with higher molecular mass not have strong fragrances?

Lerok [7]

Answer:

Basically, fragrances reach other person through sense of smell. So, the strength of the fragrances depends a lot on its evaporation, which is strongly related to the boiling point. Esters with higher molecular weight do not have a strong fragrance because it has a higher boiling point.

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2 years ago

Artemon [7]

Answer:

$9.8ms^{-2}$

Explanation:

using the equation :

$acceleration = \frac{final velocity - initial velocity}{timetaken} \\ a =\frac{v-u}{t}$

where v is 98m/s

u is 0m/s

t is 10seconds

$a=\frac{98m/s- 0m/s}{10} \\a=\frac{98}{10}\\ a=9.8m/s^{2}$

3 0

2 years ago

The pka of hf is 3.2 determine the pkb of hf?

Julli [10]

Well, first we must remember that

$pK_{a}+pK_{b}=14$

This is because

$K_{a}*K_{b}=10^{-14}$

$-log(K_{a}*K_{b})=-log(10^{-14})\\-logK_{a}+-logK_{b}=-log(10^{-14})\\pK_{a}+pK_{b}=14$

So then

$pK_{b}=14-pK_{a}=14-3.2=1.8$

7 0

3 years ago

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What is the percent composition by mass for hydrogen in water (H2O)?

saw5 [17]

Explanation:

Percentage composition = 2/18 = 11.11%.

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3 years ago