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Mars2501 [29]
3 years ago
11

Please help me i keep getting this wrong :(

Chemistry
1 answer:
solmaris [256]3 years ago
7 0
A) <span>A chandelier has been hanging in the kitchen for years
B) </span><span>A log floats on top of the lake
C) </span><span>You place your book on the top of a flat table

Those are the answers. In each case, there is always a force that balances the weight of the object and keeps them in a static equilibrium. Tension, Buoyancy and Normal force.</span>
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Hydrofluoric acid, hf, has a ka of 6.8 × 10−4. what are [h3o+], [f−], and [oh−] in 0.710 m hf?
STALIN [3.7K]

Answer:

[H₃O⁺] = [F⁻] = 2.2 x 10⁻² M. & [OH⁻] = 4.55 x 10⁻¹³.

Explanation:

  • For a weak acid like HF, the dissociation of HF will be:

<em>HF + H₂O ⇄ H₃O⁺ + F⁻.</em>

[H₃O⁺] = [F⁻].

<em>∵ [H₃O⁺] = √Ka.C,</em>

Ka = 6.8 x 10⁻⁴, C = 0.710 M.

∴ [H₃O⁺] = √Ka.C = √(6.8 x 10⁻⁴)(0.710) = 2.197 x 10⁻² M ≅ 2.2 x 10⁻² M.

<em>∴ [H₃O⁺] = [F⁻] = 2.2 x 10⁻² M.</em>

<em></em>

∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.

<em>∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺]</em> = 10⁻¹⁴/(2.2 x 10⁻²) = <em>4.55 x 10⁻¹³.</em>

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3 years ago
what is the molarity of a solution that has 1.54 moles NaCI in a 3.7L solution. How do you prepare 50ml of 0.5 M of KCI from a s
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Answer:

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Explanation:

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An increase in which of the following would increase the boiling point of a<br> liquid?
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Answer:

The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.

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If it is still too liquid, add pasta, rice, tapioca or potato to absorb the excess of liquid. Get inspired by recipes you can make with the ingredients you have at home today.

Explanation:

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True or false an example of a theory is Newton's theory of gravity
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False.

Its newtons <u>law</u> of gravity. We already know that it works and has been proven.

A <u>theory</u> is an idea, or something that someone believes to be true, but might not be

5 0
3 years ago
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