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OLga [1]
3 years ago
15

I NEED HELP PLEASE FAST, BRAINLIEST! :) What's unique about the freezing of water?

Chemistry
1 answer:
Gnom [1K]3 years ago
6 0

Answer:

Instead of contracting and sinking, ice expands and floats. Ice on top of a pond or lake help protect water plants and fish during very cold weather. They live securely beneath the ice until melts in warmer weather

Explanation:

it helps the plants survive and preserves life

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Mandarinka [93]

Answer:

Potassium Bromide = KBr

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Explanation:

Potassium Bromide (KBr)

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Which two periods have the same number of elements ​
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Answer:

4 & 5 have the same number of elements

7 0
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How many joules of heat must be absorbed by 500g h2O @ 50CELCIUS to convert to steam @ 120 celcius?
nadya68 [22]

Answer:

Q = 1267720 J

Explanation:

  • Qt = QH2O + ΔHv

∴ QH2O = mCpΔT

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∴ Cp H2O = 4.186 J/g°C = 4.183 E-3 KJ/g°C

∴ ΔT = 120 - 50 = 70°C

⇒ QH2O = (500 g)(4.183 E-3 KJ/g°C)(70°C) = 146.51 KJ

∴ ΔHv H2O = 40.7 KJ/mol

moles H2O:

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⇒ ΔHv H2O = (40.7 KJ/mol)(27.548 mol) = 1121.21 KJ

⇒ Qt = 146.51 KJ + 1121.21 KJ = 1267.72 KJ = 1267720 J

5 0
2 years ago
Help plzzzzzzz ASAP!
Agata [3.3K]
I am going to say C. it has to do with the angles
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