Acids And Redox

Question 1

In a pure element what is the oxidation number

Answer 1

Zero

Question 2

Why does fluorine when reacted always have a oxidation number of -1

Answer 2

Because it is the most electronegative element

Question 3

What is the oxidation number of oxygen in peroxides

Answer 3

-1

Question 4

What is the oxidation number of oxygen when reacted with fluorine

Answer 4

+2

Question 5

What happens to the halogens when bonded to F or O

Answer 5

They can have a positive oxidation number

Question 6

What is the oxidation number of hydrogen when combined with a metal ( metal hydride)

Answer 6

-1

Question 7

What is a strong acid

Answer 7

Fully dissociates into their ions in aqueous solution

Question 8

What is a weak acid

Answer 8

Partially disossiates into their ions in aqueous solution

Question 9

What is a high conc acid

Answer 9

More H+ ions per set volume

Question 10

What is a low conc acid

Answer 10

Less H+ ions per set volume

Question 11

What are the properties of strong acids

Answer 11

Good conductors of electricity , react faster with reactive metals , react faster with carbonates

Question 12

What are the properties of weak acids

Answer 12

Poor conductors of electricity , react slowly with reactive metals , react slowly with carbonates

Question 13

Acid definition

Answer 13

A substance which releases H+ ions in aqueous solution (H+ donor)

Question 14

What’s a standard solution

Answer 14

A solution that contains a precisely known concentration of an element or a compound

Question 15

What is a titration

Answer 15

A technique where a solution of known concentration is used to determine the concentration of an unknown

Question 16

Why is a burette more accurate than a pipette

Answer 16

They can deliver variable volumes

Question 17

What is the downside of a titration

Answer 17

• ph change is gradual
  -indicator would change colours over a range of volumes