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goldenfox [79]
3 years ago
8

Water is unusual because it expands as it freezes, Very few substances have this property. The reason liquid water is more dense

then
ice can be best explained by?
Chemistry
2 answers:
timofeeve [1]3 years ago
7 0

Answer:

D.) Water is polar and the positive and negative ends of the molecule attract each other.

Explanation:

I took the test ;)

Ymorist [56]3 years ago
4 0

Answer:

When liquid water is cooled, it contracts until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%. When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

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1  3/4 Ounces or 1.75 Ounces!

Basically 21/12 = 1.75!

(Mark me as the brainliest if this helps!)

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What is a chromosome
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A chromosome is a tightly coiled X of genetic material that has genes on it.
Hope this helps!

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Read 2 more answers
Many computer chips are manufactured from silicon, which occurs in nature as SiO2 . When SiO2 is heated to melting, it reacts wi
Ierofanga [76]

Answer:

a. Theoretical yield of Si = <u>72.58 kg</u>

b. Percent Yield =<u> 91.2 %</u>

Explanation:

The chemical reaction involved is:  SiO₂ (l) + 2C (s) → Si (l) + 2CO (g)

The stoichiometric ratio = 1 mol SiO₂ ÷ 2 mol C = 0.5 mol SiO₂ ÷ 1 mol C

Given: mass of SiO₂: w₁ = 155.3kg = 155.3 × 10³g,  mass of C: w₂ = 79.3kg = 79.3 × 10³g,  mass of Si: w₃ = 66.2kg = 66.2 × 10³g                  (∵ 1 kg =1000g)

Molar mass of SiO₂: m₁ = 60.08 g/mol, atomic mass of C: m₂ = 12.01 g/mol, atomic mass of Si: m₃ = 28.08 g/mol

Number of moles of SiO₂ taken: n₁ = w₁ ÷ m₁ = 155300 g ÷ 60.08 g/mol = 2584.88 mol

Number of moles of C taken: n₂ = w₂ ÷ m₂ = 79300 g ÷ 12.01 g/mol = 6602.83 mol

Actual ratio = n₁ ÷ n₂ = 2584.88 mol SiO₂ ÷ 6602.83 mol C = 0.39 mol SiO₂ ÷ 1 mol C

Since the stoichiometric ratio > actual ratio

<u>Therefore, SiO₂ is the limiting reagent.</u>

<u />

Now, the mass of SiO₂ in 1 mol = number of moles × molar mass = 1 mol × 60.08 g/mol = 60.08 g

the mass of Si in 1 mol = number of moles × molar mass = 1 mol × 28.08 g/mol = 28.08 g

 

So 28.08 g of Si is produced from 60.08 g SiO₂

Therefore, the amount of Si produced from 155300 g SiO₂ = 155300 g × 28.08 g ÷ 60.08 g = 72583.62 g = 72.58 kg

<u>Therefore, the </u><u>theoretical yield</u><u> of Si = 72.58 kg</u>

<u>Actual yield</u><u> of Si = 66.2 kg</u>

Therefore,<u> </u><u>Percent Yield</u><u>  </u>= Actual yield ÷ Theoretical yield × 100 = 66.2 kg ÷ 72.58 kg × 100 =<u> 91.2 %</u>

3 0
3 years ago
What does the word homogenous mean?
kkurt [141]

Answer:

Homogeneous means composed of parts of different kinds; having widely different elements or components.

Explanation:

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4 years ago
Bleach boils at 101°C. Isopropyl alcohol (rubbing alcohol) boils at 82.5°C. Vinegar boils at 100.6°C. Water boils at 100°C. A st
SVETLANKA909090 [29]

Answer:

most likely water

Explanation:

most likely it is water, however pressure plays a role, if you are at sea level the boiling point of water is 100°C but if you are on Mt. Everest it is 71°C, assuming she is slightly above sea level it is water.

4 0
3 years ago
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