Formulae, equations and hazards

Question 1

What is the chemical formula of water?

Answer 1

H2O

Question 2

What is the chemical formula of carbon dioxide?

Answer 2

CO2

Question 3

What is the chemical formula of chlorine?

Answer 3

Cl2

Question 4

What is the chemical formula of ammonia?

Answer 4

NH3

Question 5

What is the chemical formula of hydrogen?

Answer 5

H2

Question 6

What is the chemical formula of oxygen?

Answer 6

O2

Question 7

What is the ionic formula of ammonium?

Answer 7

NH4 +

Question 8

What is the ionic formula of nitrate?

Answer 8

NO3 -

Question 9

What is the ionic formula of sulfate?

Answer 9

SO4 2-

Question 10

What is the ionic formula of hydroxide?

Answer 10

OH -

Question 11

What is the ionic formula of carbonate?

Answer 11

CO3 2-

Question 12

What do (s), (l), (g) and (aq) mean?

Answer 12

Solid, liquid, gas and aqueous

Question 13

How do you write a balanced ionic equation?

Answer 13

Work out the balanced symbol equation, then write out the equation breaking up any aqueous, ionic compounds into separate ions, then cross out any ions that are on both sides (the answer often is something like x+y > xy)

Question 14

What are the two purposes of hazard symbols on containers?

Answer 14

1) To indicate the dangers associated with the contents.

2) To inform people about safe-working precautions with substances in the laboratory.