Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?
Atoms of the same element are identical.
Atoms are tiny indivisible particles.
Compounds are made by combining atoms.
Atoms of different elements can combine with one another in simple whole number ratios.
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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.
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Chemistry, 22.06.2019 12:00
An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?
Answers: 1
Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about...
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