shorter hydrocarbon used • volume of hydrocarbon too • started timing late • stopped timing too early / when liquid left in funnel • must suggest why the result is than the others. allow the temperature was higher or the students used a wider funnel. 1 (c) (i) flammable 1 (ii) suitable safety precaution 1 reason that the safety precaution to the hazard symbols eg: wear gloves • (because) it is hazardous to health / harmful / toxic / irritant • or do not pour down sink or dispose of properly • (because) it is harmful to the environment / kills fish • or wear a mask or do it in the fume cupboard or a • well-ventilated area respiratory irritant • 1 (d) (i) points plotted correctly (within half small square) all six points correct scores 2 3, 4 or 5 points correct scores 1 2
• shorter hydrocarbon used • volume of hydrocarbon too • started timing late • stopped timing too early / when liquid left in funnel must suggest why the result is than the others. allow the temperature was higher or the students used a wider funnel. 1 (c) (i) flammable 1 (ii) suitable safety precaution 1 reason that the safety precaution to the hazard symbols eg: • wear gloves • (because) it is hazardous to health / harmful / toxic / irritant or • do not pour down sink or dispose of properly • (because) it is harmful to the environment / kills fish or • wear a mask or do it in the fume cupboard or a well-ventilated area • respiratory irritant 1 (d) (i) points plotted correctly (within half small square) all six points correct scores 2 3, 4 or 5 points correct scores 1 2
organic_chemistry_mark_schemes.docx