Consider the following data on some weak acids and weak bases:

acid Ka Base Kb
name Formula Name Formula
acetic acid HCH3CO2 =1.8 x10^5 Pyridine C5H5N =1.7x 10^9
hydrocyanic acid HCN =4.9 10^10 Aniline C6H5NH2 =4.3x 10^10

Use this data to rank the following solutions in order of increasing pH. In other words, select a '1'next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on.

Solution pH

a. 0.1 M NaCl
b. 0.1 M C6H5NH3Cl
c. 0.1 M C5H5NHBr
d. 0.1 M NaCN

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

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante