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AlexFokin [52]
3 years ago
15

We wanted to know how temperature affected the volume of a gas. We investigated this by filling a balloon with air and heating a

nd cooling it, comparing the circumference of the balloon before and after. Our results showed the balloon got bigger when heated and smaller when cooled. These results support our hypothesis.
a.The gas temperature will not impact the circumference of the balloonB.Gases contract when heated and expand when cooledC.The gas temperature will not impact the circumference of the balloon.
d.Gases expand when heated and contract when cooled
Chemistry
1 answer:
vagabundo [1.1K]3 years ago
7 0

According to Charle's law

The volume of an ideal gas is directly proportional to the temperature, keeping pressure and moles constant

Thus if we increase temperature of a gas it will increase its volume

In case of balloon, the gas will expand on heating and contract on cooling

Thus our hypothesis supported is

Gases expand when heated and contract when cooled

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Ka/KbMIXED PRACTICE108.Calculate the [H3O+(aq)], the pH, and the % reaction for a 0.50 mol/L HCN solution. ([H3O+(aq)] = 1.8 x 1
NeTakaya

Answer:

a) [H₃O⁺] = 1.8x10⁻⁵ M

b) pH = 4.75

c) % rxn = 3.5x10⁻³ %

Explanation:

a) The dissociation reaction of HCN is:

HCN(aq) + H₂O(l) ⇄ H₃O⁺(aq) + CN⁻(aq)

0.5 M - x                       x               x

The dissociation constant from the above reactions is given by:

Ka = \frac{[H_{3}O^{+}][CN^{-}]}{[HCN]} = 6.17 \cdot 10^{-10}

6.17 \cdot 10^{-10} = \frac{x*x}{(0.5 - x)}

6.17 \cdot 10^{-10}*(0.5 - x) - x^{2} = 0

By solving the above quadratic equation we have:

x = 1.75x10⁻⁵ M = 1.8x10⁻⁵ M = [H₃O⁺] = [CN⁻]

Hence, the [H₃O⁺] is 1.8x10⁻⁵ M.

b) The pH is equal to:

pH = -log[H_{3}O^{+}] = -log(1.75 \cdot 10^{-5} M) = 4.75    

Then, the pH of the HCN solution is 4.75.

c) The % reaction is the % ionization:

\% = \frac{x}{[HCN]} \times 100

\% = \frac{1.75 \cdot 10^{-5} M}{0.5 M} \times 100

\% = 3.5 \cdot 10^{-3} \%          

Therefore, the % reaction or % ionization is 3.5x10⁻³ %.

I hope it helps you!      

6 0
2 years ago
What characteristic is descriptive of a solution?
Snezhnost [94]
A solution is a mixture of two or more substances combined so that it is uniform, which means you cannot see the components. <span />
8 0
3 years ago
Which of the following ions is least likely to form colored compounds?
andreyandreev [35.5K]

Answer:

i think d maybe correct me if im wrong

Explanation:

3 0
2 years ago
Which of the three substances has the greatest porosity?
MArishka [77]
<h2>Answer:</h2>

<u>Most porous is gravel</u>

<h2>Explanation:</h2>

Porosity tells us how much water rock or soil can retain. It tells us about the spaces among the grains. Gravel is more bigger than sand or silt. Its grains are arranged in such a manner that their integral spaces are very bigger so they are more porous. Clay is the most porous but since it is not mentioned in the option so after clay comes the gravel. Usually gravel and sand has equal porosity.

7 0
3 years ago
Read 2 more answers
HELP PLEASE!!!!
Olegator [25]

Answer:

#4. 32.06

#5. 10.90

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