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krok68 [10]
3 years ago
11

A car travels 500km in 9 hours. How fast was it going

Chemistry
1 answer:
Firdavs [7]3 years ago
6 0

Answer:

about 55 kilometers per hour

Explanation:

distance divided by time = 500/9

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Sodium acetate spontaneously crystallizes out of a supersaturated solution upon standing or upon the addition of a seed crystal.
AlekseyPX

Answer:

Option (c) is correct.

Explanation:

According to 2nd law of thermodynamics, every spontaneous process is associated with increase in entropy (\Delta S>0).

As sodium acetate crystallizes out spontaneously therefore it is associated with \Delta S>0.

During crystallization, bond formation takes place which results evolution of heat. In other words, crystallization phenomenon is exothermic (\Delta H).

So, the given crystallization process renders the following thermodynamic quantities- \Delta S>0 J/K and \Delta H J

Option (c) is correct.

6 0
3 years ago
Select all that apply.
Vesna [10]
Select them all.
It's All of the above.
3 0
3 years ago
Read 2 more answers
Why do we produce formaldehyde?
Yuliya22 [10]

We produce formaldehyde for medicinal purposes and synthesizing polyester.

Formaldehyde is a compound that is required in about 1.5 ounces in quantity as a normal part of our metabolism.

Also formaldehyde is used as a catalyst in the formation for the synthesis of many polyesters.

Formaldehyde also has many uses such as fungicide, germicide, disinfectant and as a preservative in mortuaries as well as important chemical in medical Laboratories.

In everyday items press fabric paints coating and paper base products also includes formaldehyde.

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3 0
1 year ago
How many moles of calcium chloride, cacl2, can be added to 1.5 l of 0.020 m potassium sulfate, k2so4, before a precipitate is ex
Brut [27]
When CaSO4 → Ca2+ + SO4
So when we have Ksp = [Ca2+][SO4]

when Ksp = 4.93 x 10^-5
and [SO4] = 0.02 M 
so by substitution we can get [Ca2+] 
4.93x10^-5 = [Ca2+] [0.02]
∴ [Ca2+] = 0.0025 mol/L

∴ the moles of calcium chloride = 0.0025 mol / L * 1.5 L
                                                      = 0.00167 mol

4 0
3 years ago
The anion formed from an oxygen atom is called a(n)
marta [7]
A. Oxygen ion
I am not sure but that's the right one I think. If I am wrong then I am sorry
6 0
4 years ago
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