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nalin [4]
4 years ago
9

Covalent bonds form when electrons are

Physics
2 answers:
NeX [460]4 years ago
8 0
It would be A) shared
WINSTONCH [101]4 years ago
4 0
the answer is A) shared
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Calculate the entropy change that occurs when 1.0kg of water at 20.00 C is mixed with 2.0kg of water at 80.00 C
SOVA2 [1]

Answer:

The change in entropy ΔS = 0.0011 kJ/(kg·K)

Explanation:

The given information are;

The mass of water at 20.0°C = 1.0 kg

The mass of water at 80.0°C = 2.0 kg

The heat content per kg of each of the mass of water is given as follows;

The heat content of the mass of water at 20.0°C = h₁ = 83.92 KJ/kg

The heat content of the mass of water at 80.0°C = h₂ = 334.949 KJ/kg

Therefore, the total heat of the the two bodies = 83.92 + 2*334.949 = 753.818 kJ/kg

The heat energy of the mixture =

1 × 4200 × (T - 20) = 2 × 4200 × (80 - T)

∴ T = 60°C

The heat content, of the water at 60° = 251.154 kJ/kg

Therefore, the heat content of water in the 3 kg of the mixture = 3 × 251.154 = 753.462

The change in entropy ΔS = ΔH/T = (753.818 - 753.462)/(60 + 273.15) = 0.0011 kJ/(kg·K).

8 0
3 years ago
A radar station detects an airplane approaching directly from the east. at first observation, the range to the plane is d1 = 354
PolarNik [594]
The airplane is tracked for another 123° in the vertical eastwest plane
8 0
3 years ago
As water rises through the troposphere and cools, it changes from a(n) ————- to a(n) ———— through the process of condensation; w
Hoochie [10]

Answer:

GAS,   LIQUID,    CLOUDS

Explanation:

Water can be in three states: solid, liquid and gas, passing from one to another depending on the pressure and temperature.

In this complementation exercise.

When the water cools down the GAS goes to the LIQUID state, these small drops unite and form the CLOUDS

4 0
3 years ago
what is the density of a material if its mass is 450 kilograms and occupies a volume of 25 centimeters cubed​
asambeis [7]

Answer:

18 kg/cm³

Explanation:Density=mass/ volume=450/25=18kg/cm³

5 0
3 years ago
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Which of the following is true about semi-conductors: A. Exposing a crystal of a semiconductor to heat or light starts displacin
pogonyaev
The answer is b 100%
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3 years ago
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