What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?

A. The reactant will
weigh more than
the product

B. They both will loose
mass after the
reaction

C. They both will weigh
the same

D. The product always
weighs more than
the reactant

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Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

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.

Why is retrograde motion an apparent motion