Which of the following is the best description of conduction? * A) The transmission of heat through a medium without the motion of the medium (direct physical contact).
B)The process of changing from a gas to a liquid or from a liquid to a gas.
C)Heat transfer in a gas or liquid by the circulation of currents from one region to another.
D)The emission of energy in the form of rays or waves that can travel through empty space.

Reaction rate depends on how many molecules are coming into contact with each other with enough energy to react. increasing the temperature of the reactants will increase -

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

How does concentration affect reaction rate