C5 Chemical Change

Question 1

What is the order of reactivity series with electrolysis?

Answer 1

• Pottassium (K)
• Sodium (Na)
• Lithium (Li)
• Calcium (Ca)
• Magnesium (Mg)
• Aluminium (Al)

Question 2

What is the order of reactivity series by reducing with carbon?

Answer 2

• Carbon (C)
• Zinc (Zn)
• Iron (Fe)
• Tin (Sn)
• Lead (Pb)
• Hydrogen (H)
• Copper (Cu)

Question 3

What is the order of reactivity series with no extraction needed?

Answer 3

• Silver (Ag)
• Gold (Au)
• Platinum (Pt)

Question 4

What is the reactivity series based on?

Answer 4

Chemial reaction of metals with oxygen,water and acids

Question 5

What is the word equation for Metal + Oxygen?

Answer 5

Metal + Oxygen —> Metal Oxide

Question 6

What is the word equation for Metal + Water?

Answer 6

Metal + Water —-> Metal hydroxide + Hydrogen

Question 7

What are the observation for a metal + water reaction?

Answer 7

• Bubbling (Hydrogen gas)
• Metal solid dissolves and disappears
• It forms an alkali solution

Question 8

What is the word equation for *Metal + Acid *? (MASH)

Answer 8

Metal + Acid —-> Salt + Hydrogen

Question 9

What is the formula and suffix of salt when hydrochloric acid is reacted with water?

Answer 9

Cl−
Chloride

Question 10

What is the formula and suffix of salt when nitric acid is reacted with water?

Answer 10

NO3-
Nitrate

Question 11

What is the formula and suffix of salt when sulfuric acid is reacted with water?

Answer 11

SO4-2
Sulphate

Question 12

What is the formula and suffix of salt when phosphoric acid is reacted with water?

Answer 12

PO4-3
Phosphate

Question 13

What are the three types of bases?

Answer 13

• Metal oxide
• Metal carbonate
• Metal hydroxide

Question 14

What are the observation so a metal + acid reaction?

Answer 14

• Metal dissolves
• Starts to fizz

Question 15

Oxidation is the ….

Answer 15

Loss of electrons
and/or
Gain of Oxygen

Question 16

Reduction is the …

Answer 16

Gain of electrons
and/or
Loss of oxygen

Question 17

What type of reaction is a displacement reaction?

Answer 17

RedOx

Question 18

What is the reducing agent?

Answer 18

The reactant which oxides

Question 19

What is the oxidising agent?

Answer 19

The reactant which goes through reduction.

Question 20

What is the EXACT definition of an ore?

Answer 20

A reservoir of metals which are economically worthwhile to extract.

Question 21

What is the name of an iron ore?

Answer 21

Haematrite (Fe2O3)

Question 22

What is the name of an aluminum ore?

Answer 22

Bauxite (Al2O3

Question 23

What is the general equation for a neutralisation equation?

Answer 23

Base + Acid —> Water + Salt
(BAWS)

Question 24

What is the equation for metal carbonate + acid?

Answer 24

Metal carbonate + acid —> Carbon dioxide + Water + Salt

Question 25

How is soluble salt formed?

Answer 25

1) React the excess acid with some insoluble chemical (metal oxide) 2) Filter off the leftovers 3) Crystalise the product

Question 26

What do acids and alkalis produce in aqueous solutions?

Answer 26

Acids produce hydrogen ions (H+) Alkali produce hydroxide ions (OH¯)

Question 27

What does PH stand for?

Answer 27

Potential of Hydrogen

Question 28

What is a weak acid?

Answer 28

Weak acid is only partially ionsied in an aqueous solution.

Question 29

What is a strong acid?

Answer 29

Strong acid is fully ionised in an aqueous solution

Question 30

What happens as the concentration of hydrogen ions increases?

Answer 30

The PH decreases

Question 31

What is LiNO3?

Answer 31

Lithium nitrate

Question 32

What is K2CO3?

Answer 32

Pottasium carbonate

Question 33

What is MgBr2?

Answer 33

Magnesium bromide

Question 34

What is BaSO4?

Answer 34

Barium sulfate

Question 35

What metals react with dilute acids but not cold water?

Answer 35

- Magnesium - Aluminium - Zinc - Iron (*slow reaction*) - Lead (*slow reaction*)

Question 36

Experiment for titration (**DELETE AFTER**)

Answer 36

1. Prepare and fill a burette with acid. 2. Record the initial volume of the acid in a suitable table. 3. Using a clean, dry pipette, transfer 25.0 cm3 of alkali into a conical flask. 4. Add four drops of a suitable indicator to the alkali. 5. Add acid to the alkali, swirling the conical flask to mix. 6. When the indicator starts to change colour, add the acid dropwise (still swirling) until the end-point is reached. 7. Record the final volume of acid added. 8. Repeat until two concordant results are obtained.

Question 37

What is the balanced equation of potassium with water?

Answer 37

**2**K +**2**H2O ---> **2**KOH + H2