Edexcel GCSE Chemistry Topic 5 Separate chemistry 1 overview quiz quiz

Much lower melting points than the Group 1 metals

More reactive with cold water than the Group 1 metals

They always form white compounds rather than coloured ones

Harder and stronger with higher melting points

Different-sized atoms distort the layers so they cannot slide easily

Its atoms are all exactly the same size, so the layers slide more easily

It contains no metal atoms at all, only atoms of non-metal elements

Its bonds are ionic rather than metallic, which makes the structure harder

Water and carbon dioxide

Water and oxygen

Oxygen and nitrogen

Acid and oxygen

The zinc forms a permanent waterproof seal only, which keeps water away from the iron

Zinc is less reactive than iron, so the iron corrodes in preference to the zinc coating

Zinc is more reactive, so it is oxidised in preference (sacrificial protection)

The scratch in the zinc coating quickly reseals itself before any rusting can begin

$0.00250$ mol

$10.0$ mol

$0.400$ mol

$0.0100$ mol

$0.100$ mol/dm$^3$

$0.050$ mol/dm$^3$

$0.200$ mol/dm$^3$

$1.00$ mol/dm$^3$

Divide the concentration by the relative formula mass

Multiply by the relative formula mass

Multiply the concentration in mol/dm$^3$ by 1000

Divide the concentration in mol/dm$^3$ by 24

Theoretical yield divided by actual yield, times 100

Useful product mass divided by total product mass, times 100

Actual yield divided by theoretical yield, times 100

Moles of product times 24

Some of the atoms are destroyed during the course of the reaction

The relative formula mass of the product is far too small to measure

The molar gas volume is 24 dm$^3$ per mole at room temperature

Some product is lost in transfer or the reaction is incomplete

$12$ dm$^3$

$6.0$ dm$^3$

$24$ dm$^3$

$48$ dm$^3$

It always has a high percentage yield as well, since the two measures mean exactly the same

A large proportion of the reactant mass becomes useful product, so there is little waste

It is a very slow reaction that takes a long time to reach completion in the lab

It produces only gaseous products and no solids or liquids at all during the reaction

To use up all of the indicator that was added to the conical flask

To deliberately change the concentration of the acid in the burette

To improve accuracy and reliability by taking a mean of close results

To heat the solution in the flask up to a higher reaction temperature