Answer: 1.67 kg
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q = Heat absorbed=
=
(1kJ=1000J)
m= mass of substance = ?
c = specific heat capacity = 
Change in temperature ,
Putting in the values, we get:

(1kg=1000g)
Thus the mass (in kg) of the copper sample is 1.67
Boiling an egg and vegetables rotting . It is because chemical reaction are reactions where new substances are formed and the reaction are usually irreversible .
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Answer: The phases occur because the Sun lights different parts of the Moon as the Moon revolves around the Earth. That means the reason we see different phases of the Moon here on Earth is that we only see the parts of the Moon that are being lit up by the Sun.
Explanation:
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Answer: The density of glycerine is 
Explanation: We are given density of glycerine in
which is 
To convert t into
, we are given conversion rates:
454 grams = 1 pound
So, 1 gram will be equal to 
Similarly,

So,
will be equal to 
Converting the density of glycerin from
to
using above conversion rates, we get:


Density of glycerin is 