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Chemistry I > Past Exam Questions > Flashcards

Past Exam Questions Flashcards

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1
Q

Sodium Acetate is Dissolved in Water. The solution becomes…

A

Alkaline as water can protonate the acetate ion.

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2
Q

H2O + Cl2 → HOCl + HCl

What happens to Chlorine in this reaction?

A

It i Oxidised and Reduced Simultaneously.

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3
Q

What is the Enthalpy of a reaction?

A

The difference between the enthalpies of the products and the enthalpies of the reactants.

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4
Q

What are Lewis Bases?

A

Electron Pair Donors

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5
Q

What is an Alpha particle?

A

The nucleus of a 4He originating from a decomposing nucleus of an isotope.

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6
Q

What is a Beta particle?

A

A high speed electron emitted through radioactive decay of an isotope.

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7
Q

Why can’t an oxide ion (O2-) exist in water?

A

The Oxide ion is a strong base which is instantly protonated by water: [O2- + H2O → 2OH-]

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8
Q

Define Ionisation Energy.

A

The energy required to remove the most loosely held electron from a gaseous atom.

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9
Q

What are the units for Ionisation Energy?

A

J (Joules)

eV (Electron Volts)

J/mol (Joules per Mol)

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10
Q

What are the products of the reaction between Copper metal and Diluted Nitric Acid?

A

Cu(NO3)2 (Copper Nitrate)

NO<strong>(g)</strong> (Nitrogen Monoxide)

H2O (Water)

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11
Q

What is the electromotive force (EMF)?

A

The difference between half-cell (Cathode-Anode) potentials in a voltaic cell.

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12
Q

What is the unit of EMF?

A

Volts.

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13
Q

The majority of heavy metal ions can be detected by means of…

A

Dihydrogen Sulphide

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14
Q

Sodium Acetate (CH3COONa) is dissolved in water, the solution will be…

A

Alkaline as water can protonate the acetate ions.

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15
Q

What is an Isotope?

A

An atom whose nuclei have the same atomic number but a different mass number.

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16
Q

What is a Brønsted Base?

A

Proton Acceptor.

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17
Q

How can ammonium ions be detected?

A

Nessler Reagent

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18
Q

How can Nitrite Ions be detected?

A

Griess-Ilosvay Reagent

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19
Q

How can Arsenic ions be detected? Which precipitate colour is produced?

A

Bettendorf Reagent

Black ppt.

20
Q

What is a ligand?

A

Ions or neutral molecules that bond to a central metal atom or ion - Can often be seen in complex formation.

21
Q

What is heavy water?

A

Deuterium Oxide

D2O (2H2O)

22
Q

What is an Oxoacid? Give 3 examples.

A

An acid which contains oxygen.

HNO3

H2SO4

H3PO4

23
Q

Sulphuric Acid + Lead(II) Nitrate Produces

H2SO4 + Pb(NO3)2

A

PbSO4 + 2HNO3

(White Precipitate)

24
Q

How can Sulfide (S2-) ions be detected?

A

With Lead (II) Nitrate Solution

Producing PbS

(Black Solution Formed)

25
Q

How can Sulphate (SO42-) Ions be detected? What is the product?

A

Barium Chloride (BaCl2)

Producing BaSO4

(White Precipitate)

26
Q

How would Ammonium (NH4+) ions be detected? Which observations can be made?

A

Nessler-reagent (K2[HgI4])

Orange-Brown Precipitate

27
Q

How would you detect nitrite (NO2-) ions?

A

Griess-Ilosvay Reagent

Liquid Becomes Pink and then Yellow

28
Q

Lewis Bases ….. electrons

A

Donate

29
Q

Hydrogen Sulphide

A

H2S

30
Q

Iodine:

Colour,

Aggregation State

Solubility in water

A

Grey

Solid

Low Solubility

31
Q

Combination of I2 with KI produces…

A

K[I3]

32
Q

Example of formation of Iodine.

A

2KI + Cl2 → I2 + 2KCl

33
Q

Ammonia:

Colour

Aggregation State

Odour

A

Colourless

Gas

Sharp Odour

34
Q

NH3 + HCl →

A

NH4Cl

35
Q

AgCl + 2NH3 →

A

[Ag(NH3)2]+ + Cl-

36
Q

SnCl2

A

Tin (II) Chloride

37
Q

Al2O3

A

Aluminium Oxide

38
Q

KH2PO4

A

Potassium Dihydrogen Phosphate

39
Q

NH4SCN

A

Ammonium Thiocyanate

40
Q

Na2[Zn(OH)4]

A

Sodium TetraHydroxoZincate

41
Q

Mercury (II) Amide-Chloride

A

Hg(NH2)Cl

42
Q

Hydrogen Sulphide Ion

A

HS-

43
Q

Hydrazine

A

N2H4

44
Q

Silver (I) Nitrate

A

AgNO3

45
Q

Reaction of Copper (II) Hydroxide under heat.

A

Cu(OH)2 → CuO + H2O

46
Q

Draw a metal chelate complex.

A

Chemistry I (5 decks)

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