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iragen [17]
3 years ago
12

How much heat will be given off when 1500 g of water cools down by 20 C? please help and explain:)))

Chemistry
1 answer:
docker41 [41]3 years ago
7 0

Answer:

126000J

Explanation:

From the question given, we obtained the following information:

M = 1500g

C = 4.2J/g°C

ΔT = 20°C

Q =?

Q= MCΔT

Q = 1500 x 4.2 x 20 =

Q = 126000J

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Answer:

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Explanation:

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3 years ago
Students in a lab used a hot plate to boil water. Which of the following illustrations best represents the change in the movemen
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The second illustration is the best representation of the change in the movement of particles as the temperature of the water changes.

<u>Explanation:</u>

The second option perfectly represents the boiling of water. As when the temperature is increased, the water molecules gain energy to move faster, thus their kinetic energy of the atoms will be more. This will lead to more freely movement of all the atoms of the water.

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3 years ago
Does boron or lithium have a greater first ionization energy ?
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What quantity of heat is required to raise the temperature of 460g of aluminum from 15C to 85C?
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Answer:

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Explanation:

Given that,

Mass of Aluminium, m = 460 g

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Final temperature, T_f=85^{\circ}

We know that the specific heat of Aluminium is 0.9 J/g°C. The heat required to raise the temperature is given by :

Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q=460\ g\times 0.9\ J/g^{\circ} C\times (85-15)^{\circ} C\\\\Q=28980\ J\\\\\text{or}\\\\Q=28.9\ kJ

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