When testing a pure substance for its properties, some of the test result in the sample of being changed into another substance. Testing for which of these properties. May result in the sample substance being changed into a different substance

Solubility because when you have to test for it you need to add another liquid to the pure substance and that may cause a chemical change

i believe the answer is true.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.