CHEM 1A: QUIZ #1 (MATTER, ENERGY
AND LAB SAFETY) WITH CORRECT
ANSWERS
\.It's OK to pick up broken glassware with your hands; what is really important is
that you throw it in the broken glass container and not in the regular trash can. -
ANSWERS✔-False
\.When you eat, the food undergoes both physical and chemical changes as your
body digests it. - ANSWERS✔-True
Chewing the food converts it into smaller pieces; this is a physical change. At the
same time, saliva begins to break down some of the compounds in the food into
smaller, different compounds; this is a chemical change.
\.Each of the following substances is a pure substance: copper, carbon dioxide,
apple juice, nitrogen. - ANSWERS✔-False
\.Density is a chemical property because different chemicals have different
densities. - ANSWERS✔-False
\.When rubbing alcohol evaporates, it is undergoing a chemical change. -
ANSWERS✔-False
AND LAB SAFETY) WITH CORRECT
ANSWERS
\.It's OK to pick up broken glassware with your hands; what is really important is
that you throw it in the broken glass container and not in the regular trash can. -
ANSWERS✔-False
\.When you eat, the food undergoes both physical and chemical changes as your
body digests it. - ANSWERS✔-True
Chewing the food converts it into smaller pieces; this is a physical change. At the
same time, saliva begins to break down some of the compounds in the food into
smaller, different compounds; this is a chemical change.
\.Each of the following substances is a pure substance: copper, carbon dioxide,
apple juice, nitrogen. - ANSWERS✔-False
\.Density is a chemical property because different chemicals have different
densities. - ANSWERS✔-False
\.When rubbing alcohol evaporates, it is undergoing a chemical change. -
ANSWERS✔-False
