Higher Chemistry Prelim Quiz

1. 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 Higher Chemistry Prelim Quiz 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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

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

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

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

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

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

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

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

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

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

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

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

14. answer What relationship is used to calculate enthalpy changes? DH = cmDT

15. answer 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

16. answer Why does 1st 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

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

18. answer 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.

19. answer 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

20. 1, 2 - dibromobutane answer 19. Name this molecule

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

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

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

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

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

26. answer What is the number of atoms in 2 moles of carbon dioxide 3.612 x 1024 (6.02 x 1023 x 2 x 3)