Draw the structure of gly-ala-glu in the ionic form that predominates at ph 7

The structures of amino acids are shown in figure (1)

When they form tripeptide it will  be like Figure (2)

The structure of tripeptide at pH = 7 will be figure (3)

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

sry but any answer choices