The correct answer for the product (6.45 x 105) x (1.2 x 104) is: (considering significant figures) 7.74 x 1011
7.74 x 10
7.7 x 1011
7.7 x 10°
5.375 x 101

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

the volume increases

the answer is c.the valence of the atoms combine .

i belive it is water