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oee [108]
2 years ago
13

Look at the diagram. What number needs to be added to balance the equation?

Chemistry
1 answer:
suter [353]2 years ago
4 0

Answer:

2

Explanation:

because hydrogen is a diatomic element, so it can't be just H

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At 1 atm, how much energy is required to heat 75.0 g H 2 O ( s ) at − 20.0 ∘ C to H 2 O ( g ) at 119.0 ∘ C?
Hitman42 [59]

Answer:

238,485 Joules

Explanation:

The amount of energy required is a summation of heat of fusion, capacity and vaporization.

Q = mLf + mC∆T + mLv = m(Lf + C∆T + Lv)

m (mass of water) = 75 g

Lf (specific latent heat of fusion of water) = 336 J/g

C (specific heat capacity of water) = 4.2 J/g°C

∆T = T2 - T1 = 119 - (-20) = 119+20 = 139°C

Lv (specific latent heat of vaporization of water) = 2,260 J/g

Q = 75(336 + 4.2×139 + 2260) = 75(336 + 583.8 + 2260) = 75(3179.8) = 238,485 J

3 0
3 years ago
Which of these elements have the same number of valance electrons
solmaris [256]
Both carbon and lead belong to Group IV elements, and thus they have the same number of valence electrons. 
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6 0
3 years ago
Name the type of chemical reaction that occurs when magnesium chloride solution reacts with sodium carbonate solution
Svetlanka [38]

Answer:

precipitation reaction

8 0
3 years ago
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What is the difference between a pulley and incline plane?
erik [133]
A incline plane is a flat inclined surface. You can stick a rope in the pulley and pull one side and the other side will lift something! They are both simple machines! The difference is a incline plane is a ramp and things go up or down and the pulley lifts something with force of your weight!!
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Answer:

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I hope this helps you! Good luck with your test/assignment! :D

6 0
2 years ago
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