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3 years ago

9

Which phrase best describes heat?

1 answer:

4vir4ik [10]3 years ago

3 0

Answer:

C) the energy transferred between objects t different temperatures

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What is chromatography?

denpristay [2]

Its <span>c.chromatography is the process of separating solutions on the basis of their boiling points </span>

3 0

3 years ago

4. What is the bridge that allows you to convert from the given substance to the wanted substance

Dmitry_Shevchenko [17]

I’m not sure if this is what you are referring to but there is something called a moles bridge which allows you to convert from one substance to another

6 0

3 years ago

One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. how many kilocalories, to two significan

ollegr [7]

we need to get the total calories, we can get it by getting the average of calories of the protein, fat, and carbohydrates:
calories of protein = 15g x 4 KCal/g
= 60 KCal
calories of fat = 1 g x 9 KCal/g
= 9 kCal
calories of carbohydrates = 42 g x 4 KCal/g
= 168 Kcal
∴ the total calories = 60 + 9 + 168 = 237Kcal = 0.237 Cal
to get the resualt to two significant figures
∴ the resault is = 0.24 Cal = 240 KCal

4 0

3 years ago

12. Complete each of the following word equations for synthesis reactions.

Vlada [557]

Explanation:

12)

a) Sodium + oxygen = ?

When sodium reacts oxygen its forms sodium oxide as a product.

$4Na(s)+O_2(g)\rightarrow 2Na_2O(s)$

b) magnesium + fluorine = ?

When magnesium reacts with fluorine its forms magnesium fluoride as a product.

$Mg(s)+F_2(g)\rightarrow MgF_2(s)$

13)

a) $2HgO(s)\overset{\Delta }\rightarrow 2Hg(l)+O_2(g)$

Decomposition of mercury(II) oxide on heating gives out mercury and oxygen gas.

b) $2H_2O(l)\overset{Electricity}\rightarrow 2H_2(g)+O_2(g)$

The electrolytic decomposition of water gives out hydrogen gas amd oxygen gas.

5 0

3 years ago

Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode

miskamm [114]

Answer:

544.522 Hours

Explanation:

a) Mass = 12.5 kg = 12500 g

Now, Number of moles is given as

No of moles = Mass of Cr / Molar mass of Cr

$=\frac{12500}{52}$

= 240.38 moles

$Cr^{3+}\Rightarrow$ 3 mols of electrons are required

$\Rightarrow 240.38\times3 =721.14\text{mol of e-}$

Converting moles of e- to coulombs of charge, (1 mol of electrons = 96500 C )

Q =721.14 mol×96500 C/mol

=69590010 of charge

We know that, Q = I×t

where Q is charge, I is current and t is time required.

$\Rightarrow t =\frac{Q}{I}$

$=\frac{69590010}{35.5}$

=196281.97 seconds

$=\frac{1.96281\times10^5}{3600}$

=544.522 Hours

3 0

3 years ago