Chapter 4- Acids and Redox

Question 1

Define a strong acid

Answer 1

An acid which releases all its hydrogen atoms into solution as H+ ions and completely dissociates in aqueous solution

Question 2

Define a weak acid

Answer 2

An acid which releases only a small proportion of its available hydrogen atoms into solution as H+ ions and partially dissociates in aqueous solution

Question 3

Name 3 strong acids

Answer 3

Hydrochloric acid, Nitric Acid, Sulfuric Acid

Question 4

Name 2 weak acids

Answer 4

Ethanoic acid (CH3COOH) and Citric Acid

Question 5

Give the chemical formula for 4 bases.

Answer 5

Any from:

MgO CaO, CuO, Na2CO3 CaCO3, CuCO3

Question 6

Give the chemical formula for 3 alkalis

Answer 6

NaOH, KOH, NH3

Question 7

Give the balanced symbol equation for the neutrilisation of CuO reacting with HCl.

Answer 7

CuO+ 2HCl –> CuCl2 + H2O

Question 8

When making a standard solution, what would happen if you didn’t invert the conical flask?

Answer 8

The solute would not be evenly distributed through the solution

Question 9

What is the uncertainty when measuring volume with a 25cm3 pipette?

Answer 9

+/- 0.06cm3

Question 10

What is the uncertainty when measuring volume with a 50cm3 burette?

Answer 10

+/- 0.10cm3

Question 11

What is the oxidation number of Oxygen in a compound?

Answer 11

-2

Question 12

What is the oxidation number of the sulfur in Sulfuric Acid?

Answer 12

+6

Question 13

What is the oxidation number of the sulfur in SO4 2- ion?

Answer 13

+6

Question 14

In order to be a redox reaction, what must happen?

Answer 14

One atom is reduced and one is oxidised

Question 15

Show that Cu +2AgNO3 –> 2Ag +Cu(NO3)2 is a redox reaction.

Answer 15

Copper goes from oxidation number 0 to +2 and so is oxidised, Silver goes from an oxidation number or +1 to ) and so is reduced