Gram for gram, fats in food has much more chemical energy than sugar. One component of fat is stearic acid, C18H3602. When a sample of 5.5 g of stearic acid was burned completely in a calorimeter, the temperature of 100 mL of water changed from 25°C to 74°C. How many
calories were in the sample of stearic acid?

a) 4900 cal
b) 269.5 cal
c) 7400 cal
d) 2500 cal

Identify and describe the three ways that mutations affect organisms.

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.

If two atoms are bonded to a central atom with no lone pairs, how will they be arranged