EL7 - Bonding, Structure, Properties and Precipitates

Question 1

What is the charge on an ammonium (NH4) ion?

Answer 1

+1

Question 2

What is the charge on a Zinc ion?

Answer 2

-2

Question 3

What is the charge on a hydroxide ion?

Answer 3

-1

Question 4

What is the charge on a nitrate (V) or nitrate ion?

NO3

Answer 4

-1

Question 5

What is the charge on a hydrogen carbonate ion (HCO3)?

Answer 5

-1

Question 6

What is the charge on an oxide (O) ion?

Answer 6

-2

Question 7

What is the charge on a carbonate (CO3) ion?

Answer 7

-2

Question 8

What is the charge on a sulfate (SO4) ion?

Answer 8

-2

Question 9

What is the concentration of Na+ in seawater?

/mmol dm-3

Answer 9

470

/ mmol dm-3

Question 10

What is the concentration of Na+ in blood cells?

/mmol dm-3

Answer 10

10

/mmol dm-3

Question 11

What is the concentration of K+ in seawater?

/mmol dm-3

Answer 11

10

/mmol dm-3

Question 12

What is the concentration of K+ in blood cells?

/mmol dm-3

Answer 12

150

/mmol dm-3

Question 13

How do salts get into our seas and rivers?

Answer 13

By dissolving out of rocks.

Question 14

Occasionally shallow seas form in hot climates, particularly over geological time.

When the water evaporates, what does it leave?

Answer 14

Large deposits of sold salts called evaporites.

Question 15

Compounds of calcium:

soluble?
insoluble?

Answer 15

Insoluble

Question 16

An INCREASE in atmospheric CO2 means that

MORE GAS DISSOLVES IN SEAWATER.

What does this result in?

Answer 16

This LOWERS pH of the SEA

which could result in CaCO2 SHELLS OF MARINE ANIMALS DISSOLVING,

with disastrous consequences to the marine ecosystem.