1 Samantha wants to prove that smoking cigarettes can lead to lung cancer. What type of research would work BEST to test this theory?
О А.
case study of several smokers
OB
interview with many smokers
OC. survey of random smokers
OD. experimental study of smokers
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OB

Explanation:

interview with many smokers ,in this way she would directly be able to tell the effects

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.