AQA Combined Science: Chemistry Paper 2 - Statistics

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This quiz has been taken 47 times
37 since last reset
The average score is 28 of 118

Answer Stats

Hint	Answer	% Correct
RPA: Concentrations and rates of _____	Reaction	83%
How quickly the ______ are made	Products	78%
To find the rates of a chemical reaction: Find how quickly the ______ are used up	Reactants	70%
You can do this by increasing the ______	Temperature	70%
Or increase the _____ that they have when they collide \| They also need to collide with enough _____ to cause a reaction to take place	Energy	65%
The minimum amount of energy that particles must have before they can react	Activation energy	52%
A ______ is a substance that changes the rate of a reaction	Catalyst	52%
An increase in pressure will ______ the amount of molecules of gas	Decrease	52%
____/Maintenance	Use	52%
Reactions can only take place when the particles of reactants _____	Collide	48%
Catalysts do not get ____ __ in a reaction	Used up	48%
Over time, more and more plants evolved and removed ___ and produced O2 \| The early atmosphere was mainly ____	Carbon dioxide	43%
This is ______ theory	Collision	43%
In a lab they can be separated by ______. Industrially they are separated by fractional ______	Distillation	43%
As the chain length of a hydrocarbon increases, the boiling point _______	Increases	43%
Carbon taken in from photosynthesis ends up in new _____ material	Plant	43%
A reaction where the products can be reacted to make the original reactants	Reversible	43%
When forward and backward reactions happen at the same rate in a closed system	Equilibrium	39%
Reactions are more likely to happen between two particles if you: Increase the _____ of collisions	Frequency	39%
Hydrocarbons are compounds containing _____ and _____	Hydrogen Carbon	39%
(2.7b ya) Bacteria and algae evolved. Algae photosynthesised to produce food and ______ as a waste product	Oxygen	39%
Catalysts mean that you may not have to heat the furnace to as high _____/pressures	Temperatures	39%
Incomplete combustion produces ____ ____	Carbon Monoxide	35%
Operating at lower temperatures and pressures conserves energy and resources. This helps to combat ______ ______	Climate change	35%
C9: Crude oil is a mixture of _______ \| Diesel engines which burn larger hydrocarbons which do not always burn completely. Tiny particles containing carbon and unburnt _____ are produced	Hydrocarbons	35%
There would have been traces of _____(CH4) and _____(NH3)	Methane Ammonia	35%
High temperatures in the engine can allow usually unreactive ____ from the air to react with oxygen \| This reaction makes _____ oxides which also causes acid rain \| Volcanoes also produce _____	Nitrogen	35%
C10: A substance made up of one compound or element is ____	Pure	35%
Test for Carbon Dioxide: Limewater Result:	Cloudy	30%
Formula alkanes	CnH2n+2	30%
Growing _____ is more difficult because of increasing unpredictability of weather	Crops	30%
______: Water is passed through a special filter made of sand and gravel removing mud or grit	Filtration	30%
But absorb ____ wavelength radiation emitted from the Earth (Infrared)	Long	30%
The opposite of the above	Renewable	30%
_____ in fuel reacts with oxygen in combustion to form ______ dioxide	Sulfur	30%
Todays atmosphere has 78% N2, 21% O2 and _.___% CO2, 0.9% Argon	0.04	26%
Test for Chlorine gas: Damp blue litmus paper Result: ________	Bleaches	26%
The process of breaking down longer chain hydrocarbons into more useful, smaller ones.	Cracking	26%
Under heat in the Earth's crust and pressure, after millions of years, they formed _____ ____	Fossil Fuels	26%
Bioleaching: Bacteria feed on the ore and by a combination of biological and chemical processes, a ______ is obtained. Once again use iron and electrolysis	Leachate	26%
The principal that when conditions are changed in an equilibrium, the position of equilibrium will shift to counteract the change	Le Chatelier	26%
They provide an alternative _______ _______	Reaction pathway	26%
Test for Oxygen: Glowing splint Result: ____	Relights	26%
Draw a ____ to find the rates of reaction at any point	Tangent	26%
Short chain hydrocarbons form at the _____ of the fractional column	Top	26%
They become more ______ (thick)	Viscous	26%
(3.4b ya) The first simple organisms similar to _____ formed which broke down chemicals as a source of energy. \| Bioleaching uses \| The next uses ______ to feed on any remaining organic matter.	Bacteria	22%
Products of complete combustion, C_, W_	Carbon dioxide Water	22%
A positive test for an unsaturated hydrocarbon is that bromine water goes from orange to ______	Colourless	22%
Different substances with similar boiling points are separated into _____	Fractions	22%
An increased proportion of particles exceeding the activation energy has a _______ effect on the rate of reaction than the increased frequency of collisions	Greater	22%
Carbon dioxide also dissolved in the _____ \| The Earth cooled so water vapour condensed to form ____ in hollows in the crust	Oceans	22%
Phytomining uses	Plants	22%
Water that is safe to drink	Potable	22%
Greenhouse gases allow _____ wavelength radiation (UV) from the Sun into the atmosphere,	Short	22%
Alkenes are _________	Unsaturated	22%
Recycle / _____ management	Waste	22%
This acidic gas is toxic and is a cause of ____ ___	Acid rain	17%
Most hydrocarbons in crude oil are ______	Alkanes	17%
They can also trigger peoples _____	Asthma	17%
The total amount of Carbon dioxide and other greenhouse gases emitted over a products life cycle	Carbon footprint	17%
An increase in temperature will shift in the _______ direction	Endothermic	17%
Distance moved by substance/Distance moved by solvent	Rf	17%
Skeletons and shells build up at the bottom of oceans, and they got covered up by a fine layer of _____	Sediment	17%
As the temperature of oceans increases, Carbon dioxide gets less ____ in water	Soluble	17%
Test for Hydrogen: Lit splint. Result: ____	Squeaky pop	17%
And have a lower ______ (the tendency to turn into a gas)	Volatility	17%
C11 The Earth's atmosphere: _______ released CO2, N2 and H2O(g) into the atmosphere	Volcanoes	17%
The hydrocarbons are cracked as thermal ________ reaction	Decomposition	13%
Less _______	Flammable	13%
You can also use reverse _____, which is very _____	Osmosis Expensive	13%
Under the _____, the deposits formed sedimentary carbonates	Pressure	13%
Consequences, rising ___ ___	Sea levels	13%
Forests, and oceans are examples of carbon ____	Sinks	13%
Then the tank is aerated by bubbling __ into the waste water	Air	9%
In hotter countries, you may use ______ plants where it is effectively distillation	Desalination	9%
Settlement tank - sand and soil settle out. After this, Aluminium sulfate and lime are added. Small particles of ____ clump together and sink to the bottom	Dirt	9%
Resources that are being used up faster than they can be replaced	Finite	9%
They cause _____ ______ by reflecting sunlight back into space	Global Dimming	9%
Crude oil and natural gas are formed from ______	Plankton	9%
Methane gets into the atmosphere from swamps and ____ fields, as well as from cattle.	Rice	9%
From freshwater reservoir: ______ where water is passed through a screen to remove sticks and large objects \| Treating sewage: ______: Where large solids and grit is removed	Screening	9%
Coal is classed as a ______ rock, and comes from thick deposits of plant material such ancient trees and ferns. They died in swamps and were in the absence of _____	Sedimentary Oxygen	9%
Changes to distribution of wildlife _____	Species	9%
Extracting copper: Add ____ acid and then electrolysis. \| The plants are burnt and the copper ions can be leached from the ash by reacting with ______ acid	Sulfuric	9%
When animals eat these plants, the carbon can be transferred to animal _____, including skeletons and shells	Tissue	9%
The sludge from before is digested ________ by microorganisms	Anaerobically	4%
This is then passed over a hot _______, or mixed with steam and heated to a very high ______	Catalyst Temperature	4%
Life cycle assessment is used to assess the impact on the ___________ over it's life span	Environment	4%
A mixture designed to produce a useful product	Formulation	4%
More _____ (common) and _____ weather events	Frequent Extreme	4%
	Manufacturing	4%
These are called ______	Particulates	4%
Methane gas is also released from melting _______ in the taiga (geo p3) due increasing temperature	Permafrost	4%
5 stages of a life cycle (first to last): ____ ______ extraction	Raw material	4%
They are ______ meaning that all carbon-carbon bonds are single _____ bonds	Saturated Covalent	4%
Primary treatment: In a circular tank, solids separate out from the mixture. Large paddles rotate and push the _____ towards the centre of the tank	Sludge	4%
Other method is _____ (roasting) where the ore is heated to very high temperatures to produce impure copper	Smelting	4%
A heavy fraction is ________	Vaporised	4%
Any Ammonia and methane reacted with oxygen to form _____ _____ and nitrogen / Carbon dioxide	Water vapour	4%
CL2(_____), O3(_____), or __ is added	Chlorine Ozone UV	0%
RPA: ________	Chromatography	0%
_______ by scrap iron and electrolysis make pure copper metal	Displacement	0%
The melting and boiling points of an element or compound are called its ____ points	Fixed	0%
This water contains ______	Impurities	0%
Phytomining: Plants that can absorb copper ions are grown on soil containing ___-_____ _____ ore	Low Grade Copper	0%
Copper ore containing copper carbonate	Malachite	0%
Bacteria settle out to the bottom of the tank as a sediment. It is then ______	Sterilised	0%

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