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tigry1 [53]
3 years ago
12

The darkest part of the moon’s shadow is called the penumbra?

Chemistry
2 answers:
Georgia [21]3 years ago
6 0
No, the penumbra is the shadow that surrounds the darkest part of the shadow the darkest part of the shadow is called the umbra.
irakobra [83]3 years ago
3 0
 No it's the Umbra. hope that helped.
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A solution of salt water is boiled. The water evaporates and solid salt remains. Which statement is true?
kow [346]

The answer would be C.  

The salt and the water have both undergone physical changes.

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5 0
3 years ago
Read 2 more answers
A 45.0-gram sample of copper metal was heated from 20.0°C to 100.0°C. Calculate the heat absorbed, in kJ, by the metal.
s2008m [1.1K]

Answer:

1.386 KJ

Explanation:

From the question given above, the following data were obtained:

Mass (M) of copper = 45 g

Initial temperature (T1) = 20.0°C

Final temperature (T2) = 100.0°C

Heat absorbed (Q) =..?

Next, we shall determine the change in temperature. This can be obtained as follow:

Initial temperature (T1) = 20.0°C

Final temperature (T2) = 100.0°C

Change in temperature (ΔT) =?

ΔT = T2 – T1

ΔT = 100 – 20

ΔT = 80 °C

Next, we shall determine the heat absorbed by the sample of copper as follow:

Mass (M) of copper = 45 g

Change in temperature (ΔT) = 80 °C

Specific heat capacity (C) of copper = 0.385 J/gºC

Heat absorbed (Q) =..?

Q = MCΔT

Q = 45 × 0.385 × 80

Q = 1386 J

Finally, we shall convert 1386 J to KJ. This can be obtained as follow:

1000 J = 1 KJ

Therefore,

1386 J = 1386 J × 1 KJ /1000 J

1386 J = 1.386 KJ

Thus, the heat absorbed by the sample of the sample of copper is 1.386 KJ.

5 0
3 years ago
Why must each atom of an element always have the same number of protons?
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