Asolution containing a mixture of metal cations was treated as follows. 1. dilute hcl was added and a precipitate formed. the precipitate was filtered off. 2. h2s was bubbled through the acidic solution. again, a precipitate formed and was filtered off. 3. the ph was raised to about 9 and h2s was again bubbled through the solution. no precipitate formed. 4. finally, sodium carbonate was added and no precipitate formed. what can be said about the presence of each of these groups of cations in the original solution?

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Avariable that is not being directly tested during an experiment should be

Listenbase your answer to the question on the information below.nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body.cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment.which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61