48 The elements in the same period in the periodic table hav

48. The elements in the same period in the periodic table have the same A. atomic mass B. number of shells C. number of neutrons D. number of valence electrons 49. Which of the following solution has higher [H\'] concentration than [OH1? A. solution prepared by dissolving sulfur dioxide in water B. solution with pH = 7.5 C. solution prepared by dissolving sodium hydroxide in water D. none of these 50. What is the molarity of the resulting solution when 300. mL of a 0.400 M solution is diluted to 800. mL? A. 0.109 M B. 0.150 M C. 1.07 M D. 1.47 M 51. Which is a scientific observation? A. freezing and boiling are called physical changes B. water freezes at zero degrees C C. if a substance has a density of 1.00g/mL it must be water. R. when a substance freezes its molecules lose potential energy

Solution

Q48) elements in the period have same number of shells.

Q49) higher concentration of H⁺ implies solution is acidic. Therefore dissolving SO₂ in water will make the water acidic.

Q50) M₁V₁ = M₂V₂

_{0.4×300=M×800}

= 0.15M

Q51) B