On a temperature versus time graph, how does the temperature at the beginning of a change is state compare with the temperature at the end of the change

The temperature will remain the same.

Explanation:

When a material goes through a change of state, the temperature remains the same as witnessed on a temperature versus the time graph. Each change of state, that is, condensation, evaporation, melting, and fusion needs the withdrawal or supplementation of energy called latent heat. At the point of a change of state, there is no change in temperature. Though, in between the changes of states, the modifications in temperatures are brought about by the sensible heat.

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