22 Use the diagram below to answer the following two questions. Chemical
Change
Physical
Change
I. Chewing and mixing of food with saliva
II. Movement of food through peristalsis
III. Reaction of food with hydrochloric acid
IV. Interaction of food with bile
Which of the digestive processes above will be found in the middle section of the Venn
diagram?
F I
H III
G II
) IV

The density of a planet is 0.69 g/cm3 (density of water is 1.0 g/cm3). which of the following planets might this be? a. mercury b. venus c. saturn d. mars

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as