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3 years ago

9

Why evaporation always occurs at the surface?

1 answer:

viktelen [127]3 years ago

5 0

Evaporation occurs when molecules have enough kinetic energy that overcomes intermolecular forces of attraction and escapes into the atmosphere. At the surface of a liquid, the escaping molecule has little chances of colliding with other liquid molecules above it hence escapes easily into the atmosphere unlike those molecules deep in the liquid with other water molecules above them.

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Can you think of any practical reasons why you might want to know if there is carbon dioxide in air mixtures? please help

san4es73 [151]

Yes. carbon dioxide is deadly and i want to get away from it fast.

8 0

3 years ago

Neutralizing an olympic size swimming pool is conceptually very similar to performaing a massive titration experiment. Suppose a

MrRissso [65]

Answer:

6,97x10⁻³ gallons

Explanation:

pH is defined as:

pH = -log [H⁺]

Thus, you need to have, in the end:

10⁻⁷ = [H⁺]

And you have, in the first:

$10^{-9,33}$ = [H⁺]

The volume of swimming pool is:

700'000 galllons × $\frac{3,78541 L}{1 gallon}$ = 2649787 L

Thus, the moles of H⁺ in the first and in the end are:

First:

$10^{-9,33}mol/L$ × 2649787L = 1,24x10⁻³ moles

End:

$10^{-7}mol/L$ × 2649787L = 0,265 moles

Thus, the moles of H⁺ you need to add are:

0,265 - 1,24x10⁻³ = <em>0,26376 moles</em>

These moles comes from 10M HCl, thus, the volume in gallons you need to add are:

$0,26376moles*\frac{1L}{10moles}* \frac{1gallon}{3,78541L}$ =

<em>6,97x10⁻³ gallons</em>

<em></em>

I hope it helps!

7 0

3 years ago

In order for a nonmetal to obey the octet rule, it____.

lubasha [3.4K]

<span>C. In order for a nonmetal to obey the octet rule, it gains electrons.</span>

3 0

3 years ago

Read 2 more answers

What is temperature equilibrium?

Lunna [17]

Answer: A

Explanation: equilibrium is where all the paricles are at the

5 0

3 years ago

Describe an element and a compound. Compare and contrast their similarities and differences. Identify how elements are related t

Alenkasestr [34]

Answer:

<u>»</u><u> </u><u>Similarities</u><u> </u><u>:</u>

☑ They both react by chemical means, to produce either an element or compound as the end product of the chemical reaction.

• Take an example of Magnesium reacting with cold water:

${ \rm{Mg_{(s)} + 2H _{2} O _{(l)} → Mg(OH)_{2(aq)} + H_{2(g)}}}$

• If it reacts with steam:

${ \rm{Mg _{(s)} + H _{2} O_{(l)} → MgO_{(s)} + H_{2(g)}}}$

• [ Element: <em>Magnesium</em><em> </em>and Compound: <em>Water</em><em> </em>]

They are both classified under atomic substances cause they are made up of microscopic molecules known as atoms.

☑ They are both formed up by microscopic substances known as atoms.

<u>»</u><u> </u><u>Differences</u><u> </u><u>:</u>

☑ Compounds generally have higher molecular masses than elements.

☑ Compounds are formed through bonding by elements while elements can naturally exist or formed by extraction, purification and concentration

4 0

2 years ago