50 THE CHEMISTRY OF LIFE 



9. If sulfuric acid is spilled on your hand, it will cause a severe burn, but acetic 

 acid of similar concentration will not injure it. Both of these are acids ; why do they 

 react differently? 



10. Suppose you put some grains of an unknown chemical in water and stir 

 it up. How can you determine if this substance has gone into solution or not? 



11. How does a suspension differ from a colloidal dispersion? 



12. How are organic compounds distinguished from inorganic compounds ? 



13. Why can soap and water remove grease from your hands when water 

 alone cannot? 



14. How do the proteins differ from the carbohydrates and fats in their basic 

 chemical composition? 



