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Chemistry Nat 5 > Unit Three > Flashcards

Unit Three Flashcards

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1
Q

What is titration used for

A

to determine the volumes of solution required to reach the end point of a chemical reaction

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2
Q

What is an indicator used for

A

To show when the end point is reached

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3
Q

What is a concordant result

A

Titre volumes within 0.2 cm^3

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4
Q

What are standard solutions

A

Solutions of accurately know concentration

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5
Q

What do flame texts identify

A

The metal present in a sample

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6
Q

What is precipitation

A

The reaction of two solutions to form an insoluble salt

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7
Q

What can the formation of a precipitate tell you

A

To identify the presence of a particular ion

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8
Q

Collection of gasses

A

Collection over water
(for insoluble gases)
Downward displacement of air
(For soluble gases that are less dense than air)
Upward displacement of air
(For soluble gases that are more dense than air)

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9
Q

Use of three radioisotopes

A

C14 used for carbon dating
I132 used for treating thyroid cancer
Co60 used in radiotherapy

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10
Q

Half life definition

A

Time for half of the Nuclei of a particular isotope to decay

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11
Q

What is radioactive decay

A

It involves changes the nuclei of atoms

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12
Q

What is produced in the Haber process

A

Ammonia

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13
Q

What is produced in the Ostwald process

A

Nitric acid

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14
Q

What is the catalyst in the ostwald and Haber process

A

Ostwald- platinum
Haber- iron

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15
Q

Why can’t they increase temperatures in the Haber process

A

The backward reaction will become more dominant
(Turn 2NH3 into 3H +N2)

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16
Q

What are fertilisers

A

Substances which restore elements ,that are essential for healthy plant growth, to the soil

17
Q

What are properties of ammonia

A

Pungent
Colourless gas
dissolved in water to produce an alkaline solution

18
Q

What is a repeating unit

A

The shortest section of a polymer chain

19
Q

What are polymers

A

Long chain molecules formed by joining together a large number of monomers

20
Q

What are electrolytes

A

Electrically conducting solutions containing ions

21
Q

What is a simple cell

A

A cell that is made by placing two metals in an electrolyte

22
Q

What rod can be used in half cells

A

Graphite

23
Q

When can electricity be produced

A

When at least one of the half cells does not involve metal atoms/ions

24
Q

What is electrolysis

A

The decomposition of an ionic compound into its elements using electricity

25
Q

Why should a dc supply be used in electrolysis

A

If you what the products to be identified

26
Q

During extraction of metals what happens to the metal ions

A

They are reduced, forming metal atoms

27
Q

Reactions of metals
Metal+ oxygen
Metal+water
Metal+ dilute acid

A

Metal oxide
Metal hydroxide+ hydrogen
Salt+ hydrogen

28
Q

What is the definition of metallic bonding

A

Is the electrostatic force of attraction between positively charged ions and delocalised electrons

29
Q

Why can metals conduct electricity

A

They contain delocalised electrons

30
Q

Temperature of haber & ostwald

A

H= 450
O= 800

Chemistry Nat 5 (3 decks)

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