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velikii [3]
3 years ago
13

20 POINTS!! Kinetic and Potential Energy

Chemistry
2 answers:
stiv31 [10]3 years ago
7 0

Answer:

When a ball is rolled up a hill, it has potential energy that can turned into kinetic energy. The kinetic energy would be the ball rolling down the hill.

Explanation:

Hope this helps!

FinnZ [79.3K]3 years ago
6 0
A ball sitting on the peak of a mountain (potential) then the ball rolling down (kinetic)
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Explanation:

5 0
3 years ago
A sample of hydrated magnesium sulfate (MgSO4)
yaroslaw [1]

Answer:

MgSO4.7H2O

Explanation:

Let the formula for the hydrated magnesium sulphate be MgSO4.xH2O

Mass of the hydrated salt (MgSO4.xH2O) = 12.845g

Mass of anhydrous salt (MgSO4) = 6.273g

Mass of water molecule(xH2O) = Mass of the hydrated salt — Mass of anhydrous salt = 12.845 — 6.273 = 6.572g

Now,we can obtain the number of mole of water molecule present in the hydrated salt as follows:

Molar Mass of hydrated salt (MgSO4.xH2O) = 24 + 32 + (16x4) + x(2 + 16) = 24 + 32 + 64 + x(18) = 120 + 18x

Mass of xH2O/ Molar Mass of MgSO4.xH2O = Mass of water / mass of hydrated salt

18x/120 + 18x = 6.572/12.845

Cross multiply to express in linear form

18x x 12.845 = 6.572(120 + 18x)

231.21x = 788.64 + 118.296x

Collect like terms

231.21x — 118.296x = 788.64

112.914x = 788.64

Divide both side by 112.914

x = 788.64 /112.914

x = 7

Therefore the formula for the hydrated salt (MgSO4.xH2O) is MgSO4.7H2O

6 0
3 years ago
Vaporization is the reverse of
IRINA_888 [86]
 <span>Since Vaporization is when liquid turn to gas then the opposite of that would be Condensation because condensation is when gas turns to liquid <-- see complete opposites :D</span>
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Name three chemical properties of wood
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Explanation:

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When the sun shines and heats something, that energy is called-
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Solar energy.

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3 years ago
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