An unknown white powder is added to a beaker of water and stirred. The powder disappears after a few seconds. This unknown powder is most likely made up of

This unknown powder is most likely made up of ionic bond.

Explanation:

An ionic compound is defined as the compound formed due to transfer of electrons between its atoms.

As we know that like dissolves like. Therefore, an ionic compound is readily soluble in a polar solvent like water.

Hence, when an unknown white powder is added to a beaker of water and stirred. The powder disappears after a few seconds because the white powder is ionic in nature and it is made up of ionic bond.

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

put the answers   and i could answer.