For which of the following disease is there a vaccine?
a.
malaria
c.
encephalitis
b.
yellow fever
d.
cholera

why might global warming cause the spread of diseases caused by insects?
a.
warmer temperatures mean warmer winters which kill off less bugs and disease.
c.
warmer temperatures make bugs more active
b.
warmer temperatures allow the bugs to increase their habitat area, spreading disease into new areas.
d.
a and b

How might this scientific phenomena be explained? a paper clip floats on water.

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants.thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction.ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch,are burned? b) how much energy is released when 22.4g of ch. areburned?