fi Figure 1.5 when you mis on poder with sulfut a physical change accurs. No new substance has formed Figure 1.6 physical change the by distingswanger the sun suur and methylbenzenegye) assolve the sultor No new chemical substances are formed in these changes. If no new chemical substance is formed, a change is a physical change. Unlike chemical changes a physical change is usually easy to reverse Exercise 1.8 Explain the difference between a mixture of iron and sulfur and the compound iron sulfide 2 When vou light a piece of magnesium ribbon, it burns with a dazzling white light A white ash forms. What signs are there that a chemical change has taken place? 3 In each case, decide if a chemical or physical change is taking place. Give reasons for your answers a glass bottle breaking b butter and sugar being made into the c cotton being woven to make sheets d coal burning in air