Chlorine and hydrogen gas react to form hydrogen chloride as
shown in the following reaction:
Cl2 (g) + H2 (g) → 2HCI (g)
If a 48.5 L sample of chlorine gas was reacted with excess
hydrogen at 450 K and 1.20 atm, how many grams of hydrogen
chloride is produced?

chemical properties are the characteristic of matter which can only be observed by changing the chemical identity of a sample like flammability reactivity and toxicity.

answer; i believe that the correct answer is (a) potassium(k)

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

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current