An ordered list of chemical substances is shown. Chemical Substances
1CuO
2O2
3CO2
4NO2
5Fe
6H2O
Which substances in the list can be some of the reactants and products in the same combustion reaction? (4 points)

a
1, 2, and 3

b
2, 3, and 6

c
1, 4, and 5

d
1, 2, and 5

Answer is to avoid experimental error

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.

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