Raise the temperature of 2 g of water 2°C.

This heat requirement we can calculate by following relationship..

Q = m*C*∆T

We have, m = 2gm, C = 1 cal/g-degC, ∆T = 2 degC

Putting all these values in above equation we get

Q= 2*1*2 = 4 cal

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

50.23 i believe is correct but don't quote me on that.