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irina1246 [14]
2 years ago
10

Help pls you get 22 points if you answer me

Chemistry
1 answer:
snow_tiger [21]2 years ago
5 0

Answer:

the 2nd one

Explanation:

All other symbols are for Mathematics.

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If earth is 1.50 x 10^8km from the sun what is the distance in Mm?
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The distance of the earth to the sun in Mm = 1.5 x 10⁵

<h3>Further explanation</h3>

Given

The distance of the earth to the sun : 1.50 x 10⁸ km

Required

The distance in Mm

Solution

In converting units we must pay attention to the conversion factor.

the conversion factor :

1 kilometer(km) = 10⁻³ megameter(Mm)

So the distance conversion :

1.5 x 10⁸ x 10⁻³ = 1.5 x 10⁵ Mm

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Which weighs more, a ton of bricks or
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Which of the following describes an exothermic reaction?
Semmy [17]

Answer:

the answer is option D

Explanation:

exothermic reaction takes place when the energy required to break the bonds in the reactants is less than the energy released when new bonds are formed in the products.

7 0
2 years ago
Imagine two solutions with the same concentration and the same boiling point, but one has ethanol as the solvent and the other h
Anna71 [15]

Imagine two solutions with the same concentration and the same boiling point.?

Imagine two solutions with the same concentration and the same boiling point, but one has ethanol as the solvent and the other has carbon tetrachloride as the solvent. Determine that concentration and boiling point.

ethanol: 78.4 °C Kb=1.22 c/m

carbon tetrachloride: 76.8 °C Kb=5.03 c/m

Answer:

The molal concentrations are 0.42 m.

Explanation:

This question seeks to explain the boiling point elevation as a colligative property of a mixture.

Colligative property of a mixture/solution is one that describes any property of that that depends only on the number of molecules present.

∆T=Kb.m

∆T - Change in boiling point

Kb- boiling point constant

m - molality

The change in boiling points are 1.6 degrees apart; i.e.,∆T= 78.4-76.8 = 1.6 so the CCl4 must increase 1.6 more than the ethanol.

Remember that

If you want the boiling point to be the same, that means you want

T (ethanol) = T (CCl4)

T (CCl4) =5.03*m

∆T = [1.22*m + 1.6]

[1.22*m + 1.6] = 5.03*m

If concentration is the same;

and solve for m

m = 0.42.

We can check that out from

∆T = Kb*m

∆T(ethanol)= 1.22*0.42 = 0.51

so boiling point. = 78.4 + 0.51 = 78.9

∆T(CCl4) = 5.03*0.42 = 2.1

so boiling point. = 76.8 + 2.1 = 78.9

and the boiling point are the same.

The molal concentrations are 0.42 m.

3 0
2 years ago
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