The diagram shows molecules moving across a selectively permeable membrane. The smaller circles represent salt molecules, and the dashed line represents the membrane. Which statement best describes the movement of the salt molecules? Their movement requires energy. Their movement represents active transport. They move from high concentration to low concentration. They become unevenly distributed.

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

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