Answer : The heat your body transfer must be, 25.1 kJ
Explanation :
Formula used :
or,
where,
Q = heat = ?
m = mass of water = 500.0 g
c = specific heat of water =
= initial temperature =
= final temperature =
Now put all the given value in the above formula, we get:
Therefore, the heat your body transfer must be, 25.1 kJ
Answer : The correct option is, (D)
Explanation :
(A)
This reaction is a double displacement reaction in which the cation and anion of two reactants are exchange their places to give two different products.
(B)
This reaction is a decomposition reaction in which the larger molecule decomposes to give two or more products.
(C)
This reaction is a neutralization reaction in which an acid and a base react to give a salt and water as a product.
(D)
This reaction is a redox reaction in which the oxidation and reduction reaction occur simultaneously.
Oxidation reaction is the reaction in which a substance looses its electrons. In this oxidation state increases.
Reduction reaction is the reaction in which a substance gains electrons. In this oxidation state decreases.
In this reaction, magnesium shows oxidation due to change in oxidation number from (0) to (+2) and hydrogen shows reduction due to change in oxidation number from (-1) to (0).
Hence, the correct option is, (D)