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3 years ago

How does water relative densities as a solid and a liquid differ from that most other substance ?

Chemistry

1 answer:

tester [92]3 years ago

7 0

Answer:

The density of the solid form of water is less than the density of water in its liquid form. However, majority of other substances increases in density when they solidify.

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Explain why aluminum is a substance

Neko [114]

Answer:

Explanation:

Aluminium is a silvery-white, lightweight metal. It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts. This is because of its particular properties.

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4 years ago

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Explain the importance of soil as one of earth's resources.

g100num [7]

Answer:

it gives our vegetables the nutrients they need to grow and to be healthy

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3 years ago

Which is Earth's largest source of drinkable water?

Leviafan [203]

Depends on what you’re going for. i’d say aquifers. but you can drink from clean rivers

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3 years ago

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A solution containing a mixture of lactic acid and lactate was found to have a pH of 4.26. Calculate the ratio of the lactate co

Aleks04 [339]

Given :

pH of solution of mixture of lactic acid and lactate is 4.26 .

To Find : $log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4$

The ratio of the lactate concentration to the lactate .

Solution :

We know , pKa of lactic acid is :

pKa = 3.86 .

Now , the solution of lactic acid and lactate is a buffer solution .

So , pHof buffer acid is given by :

$pH=pKa+log(\dfrac{[Salt]}{[Acid]})$

Putting all given values :

$log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4$

Taking anti log both the sides , we get :

$\dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]} = 2.51$

Therefore , the ratio of the lactate concentration to the lactate is 2.51 .

Hence , this is the required solution .

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3 years ago

How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific nota

hammer [34]

You have to use Avogadro's number which is 6.02x10^23. The units of Avogadro's number is molecules/mole so you divide the number of molecules by Avogadro's number which will give you the number of moles.
(2.0x10^22 molecules)/(6.02x10^23 molecules/mole)=0.033 moles

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4 years ago