FREE CHEMISTRY AND STUDY GAMES ABOUT AQA A1

PDF Download

FREE CHEMISTRY AND STUDY GAMES ABOUT AQA A1

FUELS EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -50 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: State advantages of using biofuels compared to Fossil Fuels

Answer:

Biofuels use renewable resources; they burn more efficiently; they are Carbon-Neutral; Saves finite resources (Crude Oil) for other purposes (making plastics)

Question 2: What is the effect of CO2 on the environment?

Answer:

Enhanced Greenhouse effect

Question 3: Why do Alcohol, such as Ethanol, burn more efficiently?

Answer:

There is already an Oxygen in the molecule of Ethanol

Question 4: What is the metal used in catalytic converter?

Answer:

Platinum

Question 5: Write the balanced equation for the isomerisation of Hexane

Answer:

Hexane --> Methyl-2 Pentane Question 6: Why does Petroleum Industry uses reformation, cracking and isomerisation?

Answer:

To make fuels more efficient

Question 7: Describe the cracking experiment

Answer:

vapours of a long chain alkane are passed over a HOT aluminium oxide catalysts

Question 8: Describe the difference between an AlkAne and an AlkEne

Answer:

Alkane have only single C-C bonds whilst Alkenes have at least one double C=C bond

Question 9: Why is the process of making biofuel not completely Carbon-Neutral?

Answer:

Energy is needed for distillation process , transport of the raw materials to the factory Question 10: Why is the boiling point of a straight-chain alkane higher than the corresponding branched isomer?

Answer:

1)Chains can move closer together/more points of contact; 2) higher VdW BETWEEN molecules; 3) more energy needed to break APART the MOLECULES Question 11: Explain why branched Alkanes have a lower b.p. than the straight chain isomer, in terms of intermolecular forces

Answer:

STRAIGHTER chains of Hydrocarbons have a higher b.p. because there are more points of CONTACT between molecules so the VdW forces BETWEEN MOLECULES will be stronger so it will take more ENERGY to separate the molecules.Also less packing=less VdW

Question 12: Name 3 ways of making a fuel more efficient

Answer:

isomerisation, reforming, shortening chain Question 13: What is the equation for the neutralisation of Sulfur Dioxide by Calcium Carbonate?

Answer:

SO2 + CaCO3 + 1/2 O2 --> CaSO4 + CO2 NOTE that there is Oxygen involved!Question 14: Why do are Rhodium and Platinum catalysts placed on a honeycomb structure in a catalytic converter?

Answer:

To provide a larger surface area

Question 15: What is the SOLID chemical formed by incomplete combustion?

Answer:

Carbon

Question 16: Write the balanced equation for the reforming of Hexane

Answer:

C6H14 --> C6H12 + H2

Question 17: What is reforming?

Answer:

formation of a benzene ring

Question 18: How is this pollutant formed? NO

Answer:

in HOT engine when oxygen FROM THE AIR reacts with Nitrogen FROM THE AIR Question 19: Explain how fractional distillation works, in terms of intermolecular forces

Answer:

LONGER chains of Hydrocarbons have a higher b.p. because there are more points of CONTACT between molecules so the VdW forces BETWEEN MOLECULES will be stronger so it will take more ENERGY to separate the molecules.

Question 20: Which fuel can make engines corrode?

Answer:

Ethanol

Question 21: What is the effect of CO on the environment?

Answer:

Toxic gas

Question 22: Write the balanced equation for the COMPLETE combustion of Hexane

Answer:

C6H14 + 6.5 O2 --> 6 CO2 + 7 H2O It is quite fine to use .5 of a mole!

Question 23: What is the effect of NOx on the environment?

Answer:

Dissolves in WATER in clouds to produce Nitric Acid, part of Acid Rain Question 24: What is the equation for the formation of Nitric Acid from Nitrogen Dioxide?

Answer:

• NO2 + H2O + 1/2 O2 --> 2HNO3 ; NOTE that there is Oxygen involved!

Question 25: What is the hazard linked to soot/carbon/particulates produced during incomplete combustion?

Answer:

irritates the lungs

Question 26: What is the equation for the fermentation process?

Answer:

C6H12O6 --> 2CO2 + 2C2H5OH

Question 27: What is Carcking?

Answer:

A long chain hydrocarbon has been broken into two smaller molecules: a smaller alkane and an alkene