AQUATIC CHEM QUIZ 2

Question 1

What is a transition metal

Answer 1

Any of the metallic elements occupying a central block in the periodic table

e.g. iron chromium manganese copper

Question 2

Properties of transition metals

Answer 2

Strong tendency to form coordination compounds
Variable valency
Many of their compounds are coloured

Question 3

What is coordination number

Answer 3

The number of coordinate

bonds to the central metal ion= six

Question 4

Overall charge

Answer 4

The sum of the charges of the metal ion and the ligands

Question 5

Hydrated metal ions

Answer 5

Tend to lose H+ ions and aqueous solution

E.g. Hydrated iron (III) ion is a relatively strong acid

Question 6

Divalent metal ions

Answer 6

Do not lose a hydrogen ion below pH 6

Question 7

Monovalent metal ions

Answer 7

Do not act as acids-exist as hydrogen ions

Question 8

Trivalent metal ions

Answer 8

Minus at least 1 H+ @ neutral pH or above

Question 9

What element has the highest concentration of cations found in freshwater

Answer 9

Calcium

Ca2+ is a key element in geochemical processes

Question 10

What elements lead to water hardness

Answer 10

Calcium ion
magnesium
(Sometimes) iron(II) ion

Question 11

How to remove temporary water hardness

Answer 11

Boiling water

Question 12

What is the cause of temporary water hardness?

Answer 12

Presence of calcium and bicarbonate (HCO3-) ions