Answer: an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack)
Explanation:
Endothermic reactions: These are the reactions in which energy is required in the reaction. The energy of the products are more than the energy of the reactants.
Exothermic reactions: These are the reactions in which energy is released in the reaction. The energy of the products is less than the energy of the reactants.
a) water droplets condensing on a soda can on a hot summer day : As the gaseous molecules are changing into liquid phase, energy is released and is exothermic
b) an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack) : As the temperature is decreasing , energy is absorbed by the surroundings and thus is endothermic
c) thermite reaction between iron(III) oxide and aluminium (spectacular flames are observed) : As flames are produced, the energy is released and thus is exothermic
d) freezing water to make ice cubes : As the liquid molecules are changing into solid phase, energy is released and is exothermic
vaporisation, Freezing, Condensation
Answer : The distance between the two atoms is 
Explanation :
The The formula used for moment of inertia for one atom is:
The formula used for moment of inertia for two atom is:
where,
I = moment inertia = 
r = distance of atom from axis of rotation
m = mass of atom = 
Now put all the given values in the above formula, we get:
Now we have to calculate the distance between the two atoms.
Formula used :
where,
d = distance between the two atoms
Therefore, the distance between the two atoms is
Answer:
answer - c
answer - a
Explanation:
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