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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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5. What is the final "Celsius" temperature if 2.40 L of gas at 30.5 C is cooled until the volume reaches 1.00 L at constant pres
slega [8]

Answer:

Final temperature of the gas = -146.63 °C

Explanation:

At constant pressure, volume and temperature of the gases are related as:

\frac{V_1}{T_1}=\frac{V_2}{T_2}

Where,

V1 = Initial volume = 1.00 L

V2 = Final volume = 2.40 L

T1 = Initial temperature = 30.5 °C = 30.5 + 273.15 = 303.65 K

Now, substitute the values in the above equation,

\frac{V_1}{T_1}=\frac{V_2}{T_2}

\frac{2.40\;L}{303.65}=\frac{1.00\;L}{T_2}

T_2=\frac{1.00\times 303.65}{2.40}

T2 = 126.52 K

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

T( °C) = T(K) - 273.15

          = 126.52 - 273.15 = -146.63 °C

7 0
3 years ago
When heated strongly, copper metal incorporates oxygen to form one of the copper oxides from the last problem. In one experiment
Whitepunk [10]

Answer:

1 mol of copper

Explanation:

The mass of the oxide formed is the total mass less the crucible mass, so it is:

100.52 - 88.00 = 12.52 g

It means that 10.00 g is from copper, and 2.52 g is from oxygen. The molar mass of copper is 63.50 g/mol, and the molar mass of oxygen is 16 g/mol. The number of moles (n) is the mass divided by the molar mass:

n Cu = 10.00/63.50 = 0.158 moles

n O = 2.52/16 = 0.158 moles

So, there is the same number of moles of each element, and the product must be: CuO, which has 1 mol of copper.

8 0
3 years ago
Hi give me 1 example Of kinetic energy
pishuonlain [190]

Answer:

A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass

Explanation:

8 0
3 years ago
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Given that the approximate bond length of o–h in water is roughly 1 å, what is the approximate distance each proton "hops" betwe
Ksenya-84 [330]

The hydrogen bond is a comparatively weak interaction between a proton hop and an electronegative atom present in a molecule. The hydrogen bond plays a very important role for the determination of state of a compound like gaseous, liquid or solid. The strength of the hydrogen bond depends on the close distance between the participants i.e. the electronegative atom and proton hop. There remains strong hydrogen bond between the two water molecules which is expressed as O....H. The distance of the hydrogen bond is 1.8A° formed between each proton hops of two neighboring water molecules. The hydrogen bond interaction is shown in the figure.

6 0
3 years ago
Suppose 0.09886 M KOH is titrated into 15.00 mL H2SO4 of unknown concentration until the equivalence point is reached. It takes
AleksAgata [21]

Answer:0.00028917

Explanation:

8 1
3 years ago
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