Which chemical equation correctly shows the dissociation of magnesium hydroxide?

A) Mg(OH)₂ ? Mg²⁺ + 2OH¯

B) MgOH ? Mg²⁺ + OH²¯

C) Mg(OH)₃ ? Mg³⁺ + OH¯

D) Mg(OH)₂ ? Mg²⁺ + H₂O + O^2-

What is the concentration of H⁺ ions in an aqueous solution with pH = 7.0?

A) 1 x 10^-3 M

B) 1 x 10^-7 M

C) 1 x 10^-9 M

D) 1 x 10^-11 M

What is the molarity of sodium chloride in a solution containing 0.25 mol of sodium chloride in 250 mL of water? Show all your work clearly.

A) 0.25 M

B) 0.50 M

C) 1.0 M

D) 5.0 M

How many protons, neutrons, and electrons are there in the neutral atom of 32/16 S

A) 32 protons, 32 neutrons, 16 electrons

B) 16 protons, 16 neutrons, 32 electrons

C) 16 protons, 16 neutrons, 16 electrons

D) 32 protons, 16 neutrons, 32 electrons

Elements in the same column of the periodic table tend to have similar chemical and physical properties because they have the same number of

A) protons.

B) protons plus electrons.

C) valence electrons.

D) protons plus neutrons.