CHEM 110 (Neelam Sohi) Name:
Exam 1 Spring 2023
Instructions: Answer each problem.
Write clearly and legibly.
Show all your work to receive full and partial credit.
Answers must have the proper number of significant figures and be in the requested units.
Please box or circle your final answer where applicable.
Read each question carefully.
Take a deep breath, relax, and do your best.
Honor Statement (Your exam WILL NOT be graded unless you sign this).
By signing you agree to honestly take this exam and not discuss the contents of this exam with
anybody who still has to take the exam.
Signed: ________________________________
, 1. Matter can be classified according to the types of particles that it composes. By each
example, write whether the example is a compound, element, heterogeneous mixture or
homogenous mixture. (5 pts)
a. Nitrogen dioxide gas (NO2).
b. Oxygen gas (O2).
c. A beaker full of water and sand.
d. A dilute solution of sodium hydroxide.
e. H2O.
2. Limestone (CaCO3) is an important ingredient in the manufacture of iron, cement, and
other commodities. When one mole of limestone is heated, one mole of quicklime (CaO)
and one mole of carbon dioxide (CO2) are formed.
a) What mass of quicklime (CaO) can be obtained from 200 grams of limestone? (4 pts).
b) What mass of Carbon dioxide can be obtained from 200 grams of limestone? (3 pts)
Exam 1 Spring 2023
Instructions: Answer each problem.
Write clearly and legibly.
Show all your work to receive full and partial credit.
Answers must have the proper number of significant figures and be in the requested units.
Please box or circle your final answer where applicable.
Read each question carefully.
Take a deep breath, relax, and do your best.
Honor Statement (Your exam WILL NOT be graded unless you sign this).
By signing you agree to honestly take this exam and not discuss the contents of this exam with
anybody who still has to take the exam.
Signed: ________________________________
, 1. Matter can be classified according to the types of particles that it composes. By each
example, write whether the example is a compound, element, heterogeneous mixture or
homogenous mixture. (5 pts)
a. Nitrogen dioxide gas (NO2).
b. Oxygen gas (O2).
c. A beaker full of water and sand.
d. A dilute solution of sodium hydroxide.
e. H2O.
2. Limestone (CaCO3) is an important ingredient in the manufacture of iron, cement, and
other commodities. When one mole of limestone is heated, one mole of quicklime (CaO)
and one mole of carbon dioxide (CO2) are formed.
a) What mass of quicklime (CaO) can be obtained from 200 grams of limestone? (4 pts).
b) What mass of Carbon dioxide can be obtained from 200 grams of limestone? (3 pts)
