Use the data given below to construct a born-haber cycle to determine the heat of formation of kcl. δ h°(kj) k(s) → k(g) 89 k(g) → k+(g) + e- 418 cl2(g) → 2 cl(g) 244 cl(g) + e- → cl-(g) -349 kcl(s) → k+(g) + cl-(g) 717 use the data given below to construct a born-haber cycle to determine the heat of formation of kcl. h°(kj) k(s) → k(g) 89 k(g) → k+(g) + e- 418 cl2(g) → 2 cl(g) 244 cl(g) + e- → cl-(g) -349 kcl(s) → k+(g) + cl-(g) 717 -1119 kj +631 kj +158 kj -997 kj -437 kj

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

indium, and thallium have three electrons i think

b. is the answer hoped i