Guide questions 1. Which of the materials above are compounds? 2 Are the components of compounds combined chemically or physically? 3. Which of the materials above are mixtures? 4. Are the component of mixtures combined chemically or physically? 5 Which among the materials have a fixed amount of components? Are they compounds or mixtures? 6. Which among the materials have a varying amount of components? Are they compounds or mixtures? 7. If you add or remove one component will it change the chemical identity of the materials or the other components?​