CHEM 1020 FINAL EXAM 184 COMPETENCY
REVIEW 2026 MOCK TEST COMPLETE KEY
INSIGHTS
◉ A computer chip was weighed and found to have a mass of
23.3040 g. How many significant figures does this number have?
Answer: 6
◉ A substance that can be broken down into two or more simpler
substances only by chemical method is called a
Answer: compound
◉ Which differentiates a compound from a mixture of two or more
elements?
Answer: A compound does not exhibit the individual properties of
the elements of which it is composed
◉ How many protons, neutrons, and electrons are there in a neutral
atom of 19/9 F?
Answer: 9, 10, 9
◉ What distinguishes the atoms of one element from another?
,Answer: The number of protons
◉ Which corresponds to the composition of the ion typically formed
by magnesium (Mg)?
Answer: 12 protons, 10 electrons, 2+ charge
◉ How many bromide ion can combined with one ion of aluminum
to form an ionic compound?
Answer: 2
◉ Which country is the worlds leading producer of rare earth
elements?
Answer: China
◉ A recent set of advertisements has a picture of an aluminum can
with an aluminum-frame bicycle, alone with a hypothetical quote
from the can that reads: " I want to be a bike. Recycle me." The
analysis of the life cycle of an item starting with its raw materials
and ending with the used item becoming the raw material for new
products is called
Answer: cradle-to-cradle
◉ One of the lightest smartphones on the market today weighs 113
g. To protect your phone, you may want to use a screen protector,
,which weighs 27.2 g, and a heavy duty phone case, which weighs
114 g. What is the total weight of the phone, screen protector, and
case?
Answer: 254
◉ What is the following mathematical operation? (1.42 +9.4) x 2.854
Answer: 30.9
◉ How many cm are in 0.129m ?
Answer: 12.9
◉ Which one of the following is an example of a homogeneous
mixture?
Answer: a glass of pulp-free lemonade
◉ Classify each type of matter.
A beaker full ethanol, a mushroom omelet, flat cola, oxygen gas
Answer: ethanol - compound
mushroom omelet - heterogeneous mixture
flat cola - Homogeneous mixture
Oxygen gas - element
, ◉ Sheila has a mass of 59,100 grams. Express this mass in scientific
notation.
How many significant figures is this?
What is her mass in pounds?
Answer: 5.91 x 10^4
3 sig. figs
130 lbs.
◉ What element has an atomic number of 46?
Answer: Pd - Palladium
◉ How many neutrons does iodine with an atomic mass of 127
have?
Answer: 74
◉ How many electrons does iodine 127 have?
Answer: 53
◉ True or False, non-metals are shiny, conductive and malleable?
Answer: False
◉ Metalloid
REVIEW 2026 MOCK TEST COMPLETE KEY
INSIGHTS
◉ A computer chip was weighed and found to have a mass of
23.3040 g. How many significant figures does this number have?
Answer: 6
◉ A substance that can be broken down into two or more simpler
substances only by chemical method is called a
Answer: compound
◉ Which differentiates a compound from a mixture of two or more
elements?
Answer: A compound does not exhibit the individual properties of
the elements of which it is composed
◉ How many protons, neutrons, and electrons are there in a neutral
atom of 19/9 F?
Answer: 9, 10, 9
◉ What distinguishes the atoms of one element from another?
,Answer: The number of protons
◉ Which corresponds to the composition of the ion typically formed
by magnesium (Mg)?
Answer: 12 protons, 10 electrons, 2+ charge
◉ How many bromide ion can combined with one ion of aluminum
to form an ionic compound?
Answer: 2
◉ Which country is the worlds leading producer of rare earth
elements?
Answer: China
◉ A recent set of advertisements has a picture of an aluminum can
with an aluminum-frame bicycle, alone with a hypothetical quote
from the can that reads: " I want to be a bike. Recycle me." The
analysis of the life cycle of an item starting with its raw materials
and ending with the used item becoming the raw material for new
products is called
Answer: cradle-to-cradle
◉ One of the lightest smartphones on the market today weighs 113
g. To protect your phone, you may want to use a screen protector,
,which weighs 27.2 g, and a heavy duty phone case, which weighs
114 g. What is the total weight of the phone, screen protector, and
case?
Answer: 254
◉ What is the following mathematical operation? (1.42 +9.4) x 2.854
Answer: 30.9
◉ How many cm are in 0.129m ?
Answer: 12.9
◉ Which one of the following is an example of a homogeneous
mixture?
Answer: a glass of pulp-free lemonade
◉ Classify each type of matter.
A beaker full ethanol, a mushroom omelet, flat cola, oxygen gas
Answer: ethanol - compound
mushroom omelet - heterogeneous mixture
flat cola - Homogeneous mixture
Oxygen gas - element
, ◉ Sheila has a mass of 59,100 grams. Express this mass in scientific
notation.
How many significant figures is this?
What is her mass in pounds?
Answer: 5.91 x 10^4
3 sig. figs
130 lbs.
◉ What element has an atomic number of 46?
Answer: Pd - Palladium
◉ How many neutrons does iodine with an atomic mass of 127
have?
Answer: 74
◉ How many electrons does iodine 127 have?
Answer: 53
◉ True or False, non-metals are shiny, conductive and malleable?
Answer: False
◉ Metalloid
