How many neutrons are there in an atom of (Xe) whose mass number is 133? a. 187
b.54
c. 133
d.79
e. None of the above

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

Which position represents spring in the southern hemisphere? a) b) c) d)

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion