Flashcards
Chemistry C1 AQA Recall Questions
Flashcards do conjunto (34)
- 1Complete the general formula of alkanes (where n = number of carbon atoms).CnH2n+2
- 2Complete the general formula of alkenes (where n = number of carbon atoms).CnH2n
- 3How is carbon monoxide formed in an engine? [1]Incomplete combustion of carbon
- 4State how nitrogen oxides are produced in the engine [2]Nitrogen and oxygen in the air react together [1]
At high temperature in the engine [1] - 5Explain why there is concern about the carbon dioxide released from burning fossil fuels such as petrol [2]Because carbon dioxide causes global warming [1]
the amount of carbon dioxide in the atmosphere is increasing [1] - 6Scientists’ predictions of earthquakes are often ignored. Suggest four reasons [4]It is difficult for scientists to predict:
When/where the earthquakes might occur [2]
The strength of the earthquakes that might occur [1]
Scientists cannot monitor what is happening below the Earth’s
crust [1] - 7What did Wegener mean by ‘continental drift’?The continents were joined together
The continents then drifted apart [1] - 8Suggest what ’mantle dynamics’ is and state what causes ‘mantle dynamics’ [2]Convection currents in the mantle [1]
caused by heat [1] - 9Describe how activity within the Earth results in earthquakes [3]Earthquakes are caused by the sudden movement of the Earth’s tectonic plates [1]
caused by convection currents in the Earth’s mantle [1]
caused by the heat released by radioactive processes within the Earth [1] - 10Describe how lavender oil is separated from plant material [4]The water boils[1]
The oils are vaporised [1]
The vapours are condensed [1]
The water is tapped off leaving the oils [1] - 11Describe a test to show that olive oil contains unsaturated compounds (they might say ‘contains double bonds’ or ‘contains an alkene’ instead). Give the results of the test [2]Add bromine water [1]
it will go from orange to colourless [1] - 12To change olive oil into margarine, you need to decrease the % unsaturated fat in the oil. Give one reason why.Any one from:
to change the oil into a solid [1]
to increase its melting point [1] - 13How do you decrease the % of unsaturated fat in olive oil (or they might say increase the amount of saturation or say turn it into margarine [3]React olive oil with hydrogen [1]
Using a nickel catalyst [1]
At a temperature of about 60°C [1] - 14These oils can be hardened by reacting them with hydrogen. Does this make the oil healthier or not. Explain your answer [2]Because hydrogen reduces the number of carbon-carbon double bonds [1]
therefore there will be less polyunsaturated fat [1] - 15Describe the conditions used to produce an alkene from an alkane [2]Alkane is heated and the vapours [1]
are passed over a catalyst to produce an alkene [1] - 16Describe the conditions to produce an alcohol from an alkene. [2]Steam is added to the alkene [1]
in the presence of a catalyst to produce the alcohol [1] - 17Describe a test to show that carbon dioxide is produced in this reaction. Give the result of the test. [2]Add limewater [1]
The solution goes from colourless to milky [1]. - 18Give two reasons why the percentage of carbon dioxide decreased in the Earth’s early atmosphere. [3]Carbon dioxide dissolves in oceans OR
marine organisms use dissolved carbon dioxide to form their shells/skeletons OR
limestone was formed from the shells/skeleton of marine organisms OR
plants absorb carbon dioxide - 19Limestone is heated to make calcium oxide. Calcium oxide reacts with a substance to produce calcium hydroxide. Name the substance. [1]Water
- 20Calcium hydroxide reacts with a substance to produce calcium carbonate. Name the substance. [1]Carbon dioxide
- 21Buildings made from limestone are affected by the products from burning fossil fuels containing sulfur. Explain why. [2]Because sulfur reacts with oxygen to produce sulfur dioxide [1]
and sulfur dioxide causes acid rain that reacts with limestone [1] - 22What is made when a fuel (eg. methane) burns completely? [2]Carbon dioxide [1]
Water [1] - 23A liquid mixture like salad dressing does not separate. Explain why not, you may include a diagram to help you to answer this question. [3]Because an emulsion forms [1]
the molecules have a ‘hydrophilic end’ which dissolves the water [1]
& a ‘hydrophobic end’ which dissolves in the oil [1] - 24Give two advantages of using phytomining to extract a metal ore compared to the traditional method of extracting the ore. [2]Plants will remove carbon dioxide from the atmosphere as they grow [1]
can release energy for use when plants are burned [1] - 25Suggest one disadvantages of using phytomining compared to a more traditional method. [1]Supply not continuous as it takes a long time for plants to grow.
- 26Describe the steps involved in the fractional distillation of crude oil. [3]Heat the crude oil to vaporise [1]
The vapours condense [1]
At different temperatures [1] - 27What are alkanes? [3]Alkanes are hydrocarbons [1]
They have only have carbon-carbon single bonds or you can say they are saturated [1]
Formula is CnH2n [1] - 28Describe how volcanic activity leads to the formation of oceans [2]Water vapour released by volcanic activity [1]
condensed to form the oceans [1] - 29How do earthquakes occur? [3]earthquakes are caused by the sudden movement of the Earth’s (tectonic)
plates [1]
caused by convection currents in the Earth’s mantle [1]
caused by radioactive processes within the Earth [1] - 30An atmosphere of argon is often used in reactions involving titanium. Explain why. [2]Because oxygen in air would react with [name the reactant] [1]
whereas argon is unreactive [1] - 31Poly(ethene) molecules are made from ethene molecules by a polymerisation reaction. Describe what happens in a polymerisation reaction. [2]Many monomers (ethene) [1]
bond together [1] - 32Which electrode do metal ions eg copper ions move to?Metal ions (in this case copper ions) are positive [1]
that is why they move towards the negative electrode [1] - 33Alloys are used to make the ballpoint pen. Give two reasons why alloys are used instead of pure metals to make some objects. [2]They are harder [1]
They are more resistant to corrosion - 34What is locked up carbon dioxide? [2]Carbon dioxide from the air [1]
formed (sedimentary) rocks [1]
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- Descrição
- Recall questions for AQA Chemistry C1
- Criado por
- Izzy Noone
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