Which of the following aqueous salt solutions would you expect to be neutral, e. ph=7. a) nacn(ag) b) nh4br(aq) c) nacn(aq) d) kbr(aq) e) ca(no2)2(aq)

D) KBr(aq)

Explanation:

The salt has pH = 7 or is neutral when it is made up of a strong acid and a strong base.

A) NaCN is made up of NaOH and HCN.

NaOH is a strong base but HCN is a weak acid. It will have pH greater than 7.

B) NH₄Br is made up of NH₄OH and HBr.

NH₄OH is a weak base and HBr is a strong acid. It will have pH less than 7.

C) NaCN is made up of NaOH and HCN.

NaOH is a strong base but HCN is a weak acid. It will have pH greater than 7.

D) KBr is made up of KOH and HBr.

KOH is a strong base and also HBr is a strong acid. It will have pH equal to  7.

E) Ca(NO₂)₂ is made up of Ca(OH)₂ and HNO₂.

Ca(OH)₂ is a strong base but HNO₂ is a weak acid. It will have pH greater than 7.

i think it is d. e because the next one is igneous.

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