Chemistry! 99 + !

1.
balance the following equations and identify the type of reaction.
a.
ag + s ag2s
b.
ca(oh)2 + hcl cacl2 + _ h2o
c.
_ c4h10 + _ o2 _ co2 + _ h2o
d.
_ kclo3 _ kcl + _ o2
e.
_ agno3 + cu cu(no3)2 + _ ag

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.