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Nikitich [7]
2 years ago
10

4. Which statement correctly explains why hydrogen fluoride dissolves in water?

Chemistry
1 answer:
Lina20 [59]2 years ago
3 0
The ANSWER is D

salt In water because it is a simple ion pair Na+1 and Cl-1

Hydrogen Fluoride is similar: H+1 and F-1 and since it is a polar ion pair too it dissolves in water
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How could you use a model to show the cause-and-effect relationship between Earth's rotation and the apparent motion of the stars across the night sky?

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Gravity? or density because of the pull from the sun.

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Explain difference in melting points for the elements Na and Mg
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magnesium has a greater charge, there will be greater attraction between delocalised electrons and the positively charged ion.

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calcium is obtained industrially by electrolysis of molten cacl2 and is used in aluminum alloys. how many coulombs are needed to
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It takes 107 minutes 22 seconds and 96500 coulombs of charge produce 20.2 g of calcium.

The balanced equation for the reaction is,

CaCl _{2} \:→ \: Ca ^{ 2 + }  + 2Cl {}^{ - }

The half-reaction of calcium is,

Ca ^{2 + }  + 2e ^{ - } → \: Ca

Mass of calcium = 20.2 g

The molecular mass of calcium = 40 u.

The number of moles calcium are,

Number \: of \: moles =  \frac{mass}{molecular \: mass}

=  \frac{20.2}{40}

= 0.5 \: moles

One mole of Calcium is produced by 2 moles of electrons.

So, 0.5 moles of Calcium produce,

= 0.5 \times 2

= 1 \: mole \: of \: electron

The charge required to produce 202 g of calcium is,

=  1 \:F

= 1 \times 96500 \: C

= 96500 \: C

Current = 15 A

The time taken to produce 20.2 g of calcium is,

I  =  \frac{Q}{T}

T =  \frac{96500}{15}

= 6433.3 \: s

= 107 \: minutes \: 22 \: seconds

Therefore, 96500 columns of charge are required to produce 20.2 grams of calcium. And it takes 107 minutes and 22 seconds.

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