2.1.4 +2.1.5 Acids + Redox

Question 1

When an acid is added to water, what ion is released into the solution?

Answer 1

Hydrogen ion, H+

Question 2

Define acid

Answer 2

Proton donor

Question 3

Describe the dissociation of a strong acid

Answer 3

Full dissociation

Question 4

Define base

Answer 4

Proton aceptor

Question 5

What base is used to treat acid indigestion?

Answer 5

Magnesium hydroxide

Question 6

What are alkali?

Answer 6

Bases that can dissolve in water to form aqueous hydroxide ions

Question 7

What are atmospheric substances?

Answer 7

Substances that can act as acids and bases

Question 8

What is formed when acid reacts with carbonate?

Answer 8

Salt, carbon dioxide and water

Question 9

What is a salt?

Answer 9

A compound that is formed when H+ of an ion is replaced by a metal ion or positive ion

Question 10

What is formed when acids react with metal oxides?

Answer 10

Salt and water

Question 11

What is formed when acid reacts with alkali?

Answer 11

Salt and water

Question 12

What is formed when acid reacts with a metal?

Answer 12

Salt and hydrogen

Question 13

Why are the products same when acids react with alkali or metal oxide?

Answer 13

Both alkali and metal oxides are types of bases

Question 14

How are ammonium salts formed?

Answer 14

When acid reacts with aqueous ammonia

Question 15

What are hydrated crystals?

Answer 15

A crystalline structure containing water

Question 16

What does anhydrous crystals mean?

Answer 16

Crystalline form that contains no water

Question 17

What does a dot formula indicate?

Answer 17

The amount of water present in a crystalline structure

Question 18

What is the colour of methyl orange in an acid base and at end point?

Answer 18

Acid red
base yellow,
endpoint orange

Question 19

What is an oxidation number?

Answer 19

The number of electrons in atom uses to bond with any other atom

Question 20

What is the oxidation number of an uncombined element such as C, H or O2?

Answer 20

0

Question 21

What is the oxidation number of combined oxygen such as in H2O?

Answer 21

-2

Question 22

What is the oxidation number of oxygen in peroxide?

Answer 22

-1

Question 23

What is the oxidation number of combined hydrogen such as in NH3 or H2S?

Answer 23

+1

Question 24

What is the oxidation number of combined hydrogen and metal hydroxide such as LiH?

Answer 24

-1

Question 25

What is the oxidation number of a simple ion?

Answer 25

Charge on the ion

Question 26

What is the oxidation number of combined fluorine such as in NaF or CaF2?

Answer 26

-1

Question 27

When an element has more than one stable oxidation number? How is it indicated?

Answer 27

Written as a Roman numeral

Question 28

What is the oxidation number of Fe in iron (III) chloride?

Answer 28

+3

Question 29

What are oxyanions?

Answer 29

Negative ions that have an element along with oxygen

Question 30

What is the oxidation number of SO4 -2?

Answer 30

+6

Question 31

Define oxidation in terms of electron transfer and oxidation number

Answer 31

Oxidation is -loss of electrons -an increase in oxidation number

Question 32

Define reduction in terms of electron transfer and oxidation number

Answer 32

Reduction is -gain of electrons -a decrease in oxidation number

Question 33

What is a redox reaction

Answer 33

A reaction in which both oxidation and reduction takes place

Question 34

What is the oxidation number of a metal?

Answer 34

0 because it is an uncombined element