A student says, “When iodine sublimes, iodine molecules disappear.” Which correction is best?
They stay as iodine molecules but spread out
They break up into separate iodine atoms
They break into smaller iodine molecules
They react with oxygen to form a new gas
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.