Topic 5 - Seperate Chemistry 1

Question 1

Where are the transition metals in the periodic table?

Answer 1

The Middle

Question 2

What properties do transition metals typically have?

Answer 2

Hard, strong, shiny, malleable, conduct heat and electricity well, high melting point, high density

Question 3

List some uses of transition metals

Answer 3

Gold is used in jewellery and electrical components
Copper is used for piping and wiring
Titanium is used to make hip replacements

Question 4

What is the percentage yield formula?

Answer 4

percentage yield = (actual mass of product) ÷ (theoretical mass of product) × 100

Question 5

Are alloys softer of harder than normal metals?

Answer 5

Harder than pure metals

Question 6

Why use alloys instead of pure metals?

Answer 6

Alloys may have other beneficial properties that the metals do not have pure - eg, doesn’t rust, corrosion-proof

Question 7

What is rusting an example of?

Answer 7

Corrosion (for iron)

Question 8

What is rust called?

Answer 8

Iron oxide

Question 9

State 4 ways of preventing corrosion

Answer 9

Electroplating
Painting
Oil
Sacrificial protection
Barriers

Question 10

What is sacrificial protection?

Answer 10

Placing a more reactive metal over another, to prevent corrosion

Question 11

What is electroplating?

Answer 11

Coating the surface of a metal with another metal using electrolysis

Question 12

What does something need to corrode?

Answer 12

Oxygen and water

Question 13

Equation for atom economy

Answer 13

(Total relative mass of desired products / total relative mass of all products) x 100

Question 14

Is a high or low atom economy better for the environment?

Answer 14

High. Low atom economies use up resources very quickly and produce a lot of waste

Question 15

What is a titration used to find out?

Answer 15

How much acid is need to completely neutralise a given quantity of alkali (and vice versa)

Question 16

What colour is phenolphthalein in an acid and alkali?

Answer 16

Alkali - pink

Acid - colourless

Question 17

What colour is methyl orange in an acid and alkali?

Answer 17

Alkalis - yellow

Acids - red

Question 18

How do you do a titration?

Answer 18

Clean the burette with the acid and the beaker with the alkali. Using a pipette measure out the alkali into a beaker and add a few drops of indicator. Set up the burette over a beaker on a white tile. With the burette with the acid. Use the burette to add the acid to the alkali over time. Record the volume of the acid added to the alkali after the indicator has changed colour.

Question 19

State 3 reasons why you never get 100% yield from a reaction

Answer 19

Incomplete reaction
Losses when transferring chemicals between containers
Unwanted reactions