Astudent, wearing chemical safety goggles and a lab apron, is to perform a laboratory test to determine the ph value of two different solutions. the student is given one bottle containing a solution with a ph of 2.0 and another bottle containing a solution with a ph of 5.0. the student is also given six dropping bottles, each containing a different indicator listed in reference table m.
state one safety precaution, not mentioned in the passage, that the student should take while performing tests on the samples from the bottles.

the answer is the

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