CHEM 121 EXAM 5 2026 PRACTICE
QUESTIONS AND SOLUTIONS GUARANTEED
PASS
◉ What are most common forms of Phosphorous and Sulfur?
Answer: P4 and S8
◉ What are allotropes? Answer: Different forms of the same
element, like O2 (oxygen gas) and O3 (ozone)
◉ Name these elements: H, He, Li, Be, B, C Answer: Hydrogen,
Helium, Lithium, Beryllium, Boron, Carbon.
◉ Name these elements: N, O, F, Ne, Na, Mg Answer: Nitrogen,
Oxygen, Fluorine, Neon, Sodium, Magnesium.
◉ Name these elements: Al, Si, P, S, Cl, Ar Answer: Aluminum, Silicon,
Phosphorus, Sulfur, Chlorine, Argon.
◉ Name these elements: K, Ca, Sc, Ti, V, Cr Answer: Potassium,
Calcium, Scandium, Titanium, Vanadium, Chromium.
,◉ Name these elements: Mn, Fe, Co, Ni, Cu, Zn Answer: Manganese,
Iron, Cobalt, Nickel, Copper, Zinc.
◉ Name these elements: Ga, Ge, As, Se, Br, Kr Answer: Gallium,
Germanium, Arsenic, Selenium, Bromine, Krypton.
◉ Name these elements: Ag, Au, Sn, Pb, Hg, W Answer: Silver, Gold,
Tin, Lead, Mercury, Tungsten.
◉ What are metalloids? Answer: Elements that have metal and
nonmetal properties...they conduct electricity but not that well
(semiconductors). Like silicon.
◉ Giga (G) Answer: 1,000,000,000
◉ Mega (M) Answer: 1,000,000
◉ kilo (k) Answer: 1,000
◉ deci (d) Answer: 0.1
◉ centi (c) Answer: 0.01
, ◉ milli (m) Answer: 0.001
◉ micro (μ) or (mc) Answer: 0.000001
◉ nano (n) Answer: 0.000000001
◉ What are extensive properties? Answer: Properties that depend
on sample size like mass or volume.
◉ What are intensive properties? Answer: Properties that do NOT
depend on sample size like density or temperature.
◉ What's accuracy? What's precision? Answer: Accuracy is how
close a measurement is to the true value. Precision is how close
measurements are to each other.
◉ What's relative average error? What's relative average deviation?
Answer: Relative average error refers to the average difference
between a measurement and its true value. Relative average
deviation refers to the average difference of measurements from
each other.
A data set is accurate if the average measurements are close to the
true value.
QUESTIONS AND SOLUTIONS GUARANTEED
PASS
◉ What are most common forms of Phosphorous and Sulfur?
Answer: P4 and S8
◉ What are allotropes? Answer: Different forms of the same
element, like O2 (oxygen gas) and O3 (ozone)
◉ Name these elements: H, He, Li, Be, B, C Answer: Hydrogen,
Helium, Lithium, Beryllium, Boron, Carbon.
◉ Name these elements: N, O, F, Ne, Na, Mg Answer: Nitrogen,
Oxygen, Fluorine, Neon, Sodium, Magnesium.
◉ Name these elements: Al, Si, P, S, Cl, Ar Answer: Aluminum, Silicon,
Phosphorus, Sulfur, Chlorine, Argon.
◉ Name these elements: K, Ca, Sc, Ti, V, Cr Answer: Potassium,
Calcium, Scandium, Titanium, Vanadium, Chromium.
,◉ Name these elements: Mn, Fe, Co, Ni, Cu, Zn Answer: Manganese,
Iron, Cobalt, Nickel, Copper, Zinc.
◉ Name these elements: Ga, Ge, As, Se, Br, Kr Answer: Gallium,
Germanium, Arsenic, Selenium, Bromine, Krypton.
◉ Name these elements: Ag, Au, Sn, Pb, Hg, W Answer: Silver, Gold,
Tin, Lead, Mercury, Tungsten.
◉ What are metalloids? Answer: Elements that have metal and
nonmetal properties...they conduct electricity but not that well
(semiconductors). Like silicon.
◉ Giga (G) Answer: 1,000,000,000
◉ Mega (M) Answer: 1,000,000
◉ kilo (k) Answer: 1,000
◉ deci (d) Answer: 0.1
◉ centi (c) Answer: 0.01
, ◉ milli (m) Answer: 0.001
◉ micro (μ) or (mc) Answer: 0.000001
◉ nano (n) Answer: 0.000000001
◉ What are extensive properties? Answer: Properties that depend
on sample size like mass or volume.
◉ What are intensive properties? Answer: Properties that do NOT
depend on sample size like density or temperature.
◉ What's accuracy? What's precision? Answer: Accuracy is how
close a measurement is to the true value. Precision is how close
measurements are to each other.
◉ What's relative average error? What's relative average deviation?
Answer: Relative average error refers to the average difference
between a measurement and its true value. Relative average
deviation refers to the average difference of measurements from
each other.
A data set is accurate if the average measurements are close to the
true value.
