From Atoms to Materials

Checkpoint 13.6A Nail varnish remover Alcohol, thinner and nail varnish remover are flammable. Keep them away from fire. thinner 天拿水 nail varnish remover 洗甲水 Let’s Try 1. Circle T for a true statement and F for a false one. (a) Crude oil is a mixture of many hydrocarbons. T / F (b) Hydrocarbons are compounds made up of hydrogen, carbon and other elements. T / F (c) The boiling point of a hydrocarbon depends on its molecular size. T / F (d) Crude oil can be separated into different fractions based on the boiling points of the constituents. T / F 2. The boiling point ranges of four fractions of crude oil are listed below. Fraction Boiling point range A < 80 °C B 80 °C–170 °C C 170 °C–250 °C D 250 °C–350 °C (a) W hich fraction contains hydrocarbons of the largest molecular sizes? (b) Which fraction is the least viscous? The best solvent for dissolving oil stains Some solvents are products of crude oil, e.g. thinner* and nail varnish remover*. We also know other common solvents like water and alcohol. Which of these solvents is the best for removing oil stain on cloth? Design a fair test to compare the actions of these solvents. Video The best solvent for dissolving oil stains 90 © United Prime Educational Publishing (HK) Limited 2024 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publisher. Sample