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kondaur [170]
3 years ago
7

In the periodic table which of these elements has the smallest atomic radius ?

Chemistry
1 answer:
vivado [14]3 years ago
7 0
I think its Helium correct me if I'm wrong plz. 
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I think its correct

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*<br> The measurement for volume is?<br> O grams<br> O liters<br> Oatom<br> O mole
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Which of the following are examples of potential energy
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What are the examples ?
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The pH of a solution is 8.83±0.048.83±0.04 . What is the concentration of H+H+ in the solution and its absolute uncertainty?
slava [35]

Answer:

The concentration of H^{+} is 1.48  × 10^{-9} M

The absolute uncertainty of [{H^{+}] is ±0.12 × 10^{-9} M

The concentration of H^{+} is written as 1.48(±0.12) × 10^{-9} M

Explanation:

The pH of a solution is given by the formula below

pH = -log_{10}[{H^{+}]

∴ [H^{+}] = 10^{-pH}

where [{H^{+}] is the H^{+} concentration

From the question,

pH = 8.83±0.04

That is,

pH =8.83 and the uncertainty is ±0.04

First, we will determine [{H^{+}] from

[H^{+}] = 10^{-pH}

[{H^{+}] = 10^{-8.83}

[{H^{+}] = 1.4791 × 10^{-9} M

[{H^{+}] = 1.48 × 10^{-9} M

The concentration of H^{+} is 1.48  × 10^{-9} M

The uncertainty of [{H^{+}]  ( U_{[H^{+}] } ) from the equation [H^{+}] = 10^{-pH} is

U_{[H^{+}] } = 2.303 \\ × {[H^{+}] } × U_{pH }

Where U_{[H^{+}] } is the uncertainty of [{H^{+}]

U_{pH } is the uncertainty of the pH

Hence,

U_{[H^{+}] } = 2.303 × 1.4791 × 10^{-9} × 0.04

U_{[H^{+}] } = 1.36 × 10^{-10} M

U_{[H^{+}] } = 0.12 × 10^{-9} M

Hence, the absolute uncertainty of [{H^{+}] is ±0.12 × 10^{-9} M

6 0
4 years ago
What would happen if you added more than 5 mL of yeast solution to the H2O2?
Marat540 [252]

Answer: -

Hydrogen peroxide breaks down into water and oxygen.

2H₂O₂ → 2H₂O + O₂

The yeast present contains an enzyme called catalase which catalyses the reaction.

More the amount of the catalyst added, faster will be the decomposition of the hydrogen peroxide.

Thus if we added more than 5 mL of yeast solution to the 2H₂O₂, the breakdown would occur faster. Thus the bubbles and the accompanying fizz would be much more.

3 0
3 years ago
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