! Q3. Answer questions on the basis of your understanding of the following
paragraph aod the related studied concepts.:-
In 1827, a German physicist Georg Simon Ohm (1787-1854) found the relationship between
the current I flowing in a metallic wire and the potential difference across its terminal. The
potential difference. V across the ends of a given metallic wire in electric circuit is directly
proportional to the current flowing through it. provided temperature remains the same. This is called Ohm's law.
V.
Val V = IR
(a) What is resistance?
(6) Show graph between V vs I
(c) Calculate voltage when current is 0.6A, and resistance is 1012
(d) How does resistance depend on temperature?

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro