What are questions 5 & 6?

5. A strong base increases the OH- ion concentration in an aqueous solution.

6. It has more hydrogen ions.

Explanation:

5. Arrhenius theory states that acids donate H+ ions to a solution and bases donate OH- ions to a solution.

6. pH < 7 so the solution is acidic. Acidic solutions have more hydrogen or hydronium ions. Hydrogen and hydronium ions are essentially interchangeable.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3