1) Which of the following statements are quantitative observations about carbon?
(a) Pure carbon is found in nature in different forms: amorphous, graphite, diamond, and fullerenes.
(b) Carbon is a solid at room temperature and pressure.
(c) Carbon, as graphite, is used in fishing rods, golf clubs, tent poles and the composite parts of other sporting equipment.
(d) Carbon makes up about 23% of the human body by mass.
(e) Carbon has a molar mass of 12.01 g.
2) Which of the following are metals?
(a) calcium
(b) cobalt
(c) carbon
(d) chlorine
(e) cadmium
3) Which of the following are metalloids?
(a) silicon
(b) potassium
(c) germanium
(d) iodine
(e) manganese
4) Which of the following are qualitative observations about sodium?
(a) Sodium has a molar mass of 22.99 g.
(b) Sodium is a silvery white metal.
(c) Sodium has a density of 0.968 g/cm3.
(d) Sodium makes up about 0.14% of the human body by mass.
(e) The sodium cation is the main extracellular cation in animals and is important for nerve function in animals..
5) Which of the following are quantitative observations about iron?
(a) Iron has a molar mass of 55.84 g.
(b) Iron is a vital constituent of plant and animal life and is the key component of hemoglobin.
(c) Pure iron is not often used commercially since it is very chemically reactive and rapidly corrodes. It is usually alloyed with carbon or other metals.
(d) Iron makes up about 0.006% of the human body by mass.
(e) Iron melts at 1538°C.
6) Which of the following are metalloids?
(a) boron
(b) selenium
(c) antimony
(d) potassium
(e) krypton