Chemistry Mock Yr11 Flashcards
(a) Fertilisers are sometimes added to soil.
(i) State why fertilisers are added to soil.
To make plant grow/faster/bigger
Fertilisers contain compounds of different elements.
Three of these elements have the symbols K, N and P.
K: potassium
N: nitrogen
P: phosphorus
What do you measure volumes of liquid
P: burette (1)
Q: pipette (1)
In the titration experiment, small volumes of dilute sulfuric acid are added
gradually to the ammonia solution in a flask.
Give the letter, P, Q or R, of the piece of apparatus in Figure 1 that should be
used to add the dilute sulfuric acid.
P / burette
The titration experiment is used to produce a solution of ammonium sulfate.
Describe how solid ammonium sulfate should be obtained from this solution.
use of Bunsen burner (1)
* until all water evaporates/
disappears (1)
* until some water evaporates
then leave (1)
* leave in warm place
If liquid water is cooled below 0°C it turns into the solid, ice.
(a) (i) Give the name for the change of state from liquid to solid.
freezing
Explain why this drinking water should not be described as pure water.
pure water contains {only water
(molecules)/ only one substance}
State the information from Figure 2 that shows that the drinking water is neutral
pH is 7
State how you know that calcium is a metal from its position in the periodic table
It is on left / in group 2 / column 2
Calculate the mass of calcium ions in 250cm3
of this drinking water.
250/1000 (1) (=0.250) * 60 x 250/1000 (1) (=15)
A torch contains a chemical cell.
The torch is turned on and then left on for many hours.
Describe what you would see happen when the torch is turned on and then left
for many hours.
bright light at start (1)
* fades/ gets dimmer (1)
* then goes out (1)
What type of reaction occurs when chromium reacts with oxygen?
D) oxidation
Hydrogen and oxygen are reactants in some fuel cells.
Which word equation shows the overall reaction that occurs in these fuel cells?
hydrogen + oxygen → water
Explain why covering iron tools with a thin layer of grease prevents rusting
- air/oxygen excluded (1)
- water excluded (1)
- air/oxygen/water needed for corrosion (1)
Sacrificial protection is another way of preventing rusting.
An example of sacrificial protection is when lumps of zinc are connected to
the iron-containing structure of an oil rig.
Explain how the zinc protects the iron from rusting.
zinc is more reactive (than iron) (1)
* so reacts instead (1)
Place the metals in order of reactivity from most to least reactive.
most reactive : magnesium..
Iron..
least reactive : Silver..
Hydrogen is given off when magnesium reacts with acid.
The hydrogen is tested by collecting the gas in a test tube and igniting it.
What is the safest way to ignite the gas?
put a lighted splint at the open end of the test tube is the only correct
answer
(iii) State the observation made in this test that shows that the gas is hydrogen
Squeeze-pop-test
if hydrogen present it will make a pop sound
Iron is extracted by heating iron oxide with carbon.
Electrolysis of molten iron oxide is not used to extract iron.
(i) State why iron can be extracted by heating iron oxide with carbon.
iron is less reactive (than carbon) ORA
What does the term isotope mean
Same number of proton different number of neurone
What does the term “Electrolysis”
splitting ironic compound
Elec- electricity
lysis- Latin way meaning the act of breaking/splitting.
State why electrolysis is not used to extract iron.
electrolysis is expensive/
more expensive method than heating with
carbon/
heating with carbon is cheaper/
electrolysis needs a large amount
of electricity
What’s the mass and relative charge for proton?
Mass : 1
Charge : +1
What’s the mass and relative charge for neurone?
Mass : 1
Charge : 0
What’s the mass and relative charge of electrons?
Mass : almost 0
Charge : 1/1860
How do you find the atomic number in an element?
The smallest number
What is hydrogen
- natural gas
