2. 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Higher Chemistry Prelim Quiz This is designed to be used by teachers to help students develop skills in answering multiple choice questions. Douglas Racey, Waid Academy, Anstruther, Fife, Scotland

3. 1.How can the progress of a chemical reaction be followed? Changes in concentration, mass, volume, colour answer

4. 2.What factors can affect the rate of a chemical reaction? Concentration Particle size Temperature Use of a catalyst answer

5. 3.What is activation energy? The minimum kinetic energy required by colliding particles before a reaction will occur answer

6. 4.Which pollutant, produced during internal combustion in a car engine, is not the result of incomplete combustion? Nitrogen dioxide answer

7. 5.In a winter blend, the petrol has more answer Small molecules which are more volatile

8. 6.How many other unsaturated isomers are there of pent-1-ene? 4 answer

9. 7.What type of reaction takes place when propene is formed from propanol? answer dehydration

10. 8.When propanal is heated with Benedict’s solution what colour change takes place Blue to brick red answer

11. 9.What is a feedstock? A chemical from which other chemicals can be extracted or synthesised. answer

12. 10.What is meant by enthalpy of combustion? The energy produced when one mole of a substance is burned. answer

13. 11.What is meant by enthalpy of solution? The energy given out OR taken in when one mole of a substance is dissolved in water. answer

14. 12.What functional groups are present in aspirin? Aromatic Ester Carboxylic acid answer

15. 13.What relationship is used to calculate enthalpy changes?  H = cm  T answer

16. 14.Why does covalent radius decrease across a period? As you go across a period, more protons are added and they pull the electrons closer to the nucleus answer

17. 15.Why does 1 st ionisation energy decrease going down a group? The covalent radius increases and the electron being removed is further from the nucleus and is screened from the pull of the nucleus by extra electron energy levels answer

18. 16.What type of chemicals are manufactured by a batch process. Chemicals which require a high degree of purity e.g pharmaceuticals answer

19. 17.What is meant by saying that a reaction has reached equilibrium? At equilibrium the rates of the forward and reverse reactions are equal. The concentrations of the reactants and products remain constant. answer

20. 18.What happens to the strength of Van der Waals’ forces going down the group of halogens? INCREASES because the size and mass of the molecule increases answer

21. 19.Name this molecule answer 1, 2 - dibromobutane

22. 20.Which have stronger van der Waals’ – polar or non-polar molecules? Polar molecules answer

23. 21.What effect does increasing the concentration of a reactant have on the position of equilibrium? Shifts equilibrium to the right answer

24. 22.What is the bonding and structure found in diamond? Covalent network structure answer

25. 23.Some recently developed polymers have unusual properties. Which polymer is soluble in water? Poly(ethenol) answer

26. 24.Proteins can be denatured under acid conditions. During this denaturing, the protein molecule Changes shape answer

27. 25.What is the number of atoms in 2 moles of carbon dioxide 3.612 x 10 24 (6.02 x 10 23 x 2 x 3) answer