when 0.6g of an element J is completely burnt in excess O2 and all the heat evolved was to heat 500cm3 of water. the temperature of the water rose from 23 degrees to 32 degree celcius. calculate the relative atomic mass of element J given the specific heat capacity of water to be 4.2KJ/g. density of water 1g/cm3 and C=380K/g

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.

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll

How many grams of mgbr2 are needed to produce 75g or metal?