Concepts to understand (give an example of each): 1. significant figures 2. how to convert celsius to fahrenheit 3. how to convert fahrenheit to celsius 4. metric prefixes 5. how to calculate density 6. branches of chemistryyou very much.

1 Sig figs - the number of digits that are actually measured. 123 (3 sig figs) 1.20 (also 3 sig figs)

2 C --> F  (9/5)C + 32 = F

3 F ---> C (5/9)(F - 32)

4 Prefixes - certain designations that tells how much the unit is multiplied like Mega- is 1000000X and milli- is 1/1000

5 density = mass/volume

6 Branches - Inorganic, Organic, Analytical, Physical, Biochemistry, Forensics (There may be others, but these are the general categories)

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.