Question

27.) What coordination number and "hole" geometry would you expect for the cations in the following ionic crystals?

Sc3+ Ti3+ V2+ Cr2+ Mn2+ Fe2+ Co2+ Ni2+ Cu2+ Zn2+ 745 67 79 80 83 78 745 69 73 74 Y3+ Zr4+ Nb3+ Mot+ Tc Ru Rh Pd2+ Ag+ Cd2+ . 645 68 66.5 90 72 72 65 Ta3. W+ La 3+ 86 115 95 1p+ P22+ Au Hg2+ Hf4- Re"+ Os+ 80 137 102 What coordination number and "hole" geometry would you expect for the cations in the following ionic crystals? (see data for zinc above and other ions on reference sheet) 4 6 8 Zinc Sulfide [Choose] Magnesium Oxide [Choose] Calcium Fluoride [Choose] Sodium Chloride [Choose] Aluminum Fluoride [Choose] Strontium Sulfide [Choose] >

28.) Which one of the following statements about reflection of light is true?

29.) When light is shined on matter a variety of interactions can occur. When a glass of cow's milk is placed in direct sunlight, the milk appears translucent and white. This white color is caused by which type of light interaction?

Answer 1

Answer 28

Option A is correct

Mirrors reflect mainly because they are electrically conductive. Light is an electromagnetic field, and when it hits a mirror the metal inside of it (usually aluminum or silver) cancels out the electric field parallel to the mirror which causes it to change directions and reflect away.

Answer 29

Option c is correct

Reflection

We know that the sunlight is a mixture of seven colours. These are: violet, indigo, blue, green, yellow, orange and red. The colours of the sunlight can be separated with the help of a prism. The colour of an object depends upon the colour that reaches our eye after reflection from the object. Whatever colour is reflected by the object, is the colour of that object. The molecular structure of milk and curd is such that they do not absorb any of the colours of the sunlight but reflect all of them. Thus these substances appear white and translucent .

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