Astock solution of cu2+(aq) was prepared by placing 0.8875 g of solid cu(no3)2∙2.5 h2o in a 100.0-ml volumetric flask and diluting to the mark with water. what is the concentration (in m) of cu2+(aq)in the stock solution? molar mass of cu = 63.55 g/mol.

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

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?