which of the following is true for a nuclear reaction? electrons are lost. electrons are gained. the identity of element changes. the identity of element remains same.

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

law of conservation of matter

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

what does the table look like