A compound, Y of sodium forms a white powder. It is a constituent of baking powder and isused in some antacids. When heated it gives a compound, Y which is anhydrous and absorbs water to become hydrated salt. When this salt is kept in open air, it loses water molecules in a process
called efflorescence. When dissolved in water it forms a strong base and a weak acid, Z.
Identify the compound, Z

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

Which of the following is true about the speed of light? it depends on the wavelength.

In as 1°, 2°, 3°, or 4°. be to . : °b: °c: °d: ° : °b: °c: °d: ° : °b: °c: °d: °e: °f: °g: °h: ° : °b: °c: °d: °e: °f: °g: °h: °i: °