A student is conducting an investigation to determine the identity of an unknown substance. The following data were collected:
1. The substance is yellow
2. The substance melts at 273 degrees Celsius
3. When placed in water the substance floats
4. When in the presence of a flame, the substance does not burn.
5. When the substance is added to hydrochloric acid, a gas forms and a
temperature change occurs.
Which of these observations represent physical properties of the substance?

It is yellow

It floats on water

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