CHEMISTRY 130 ARIZONA COLLEGE OF
NURSING MIDTERM EXAM SCRIPT
COMPREHENSIVE QUESTIONS AND
CORRECT ANSWERS ALREADY PASSED
⩥ Why is it important to use demineralized water?
Answer: Demineralized water doesn't contain minerals
⩥ In order for gravimetric analysis to be valid, we want all of the
chloride ions to precipitate. How can we ensure this?
Answer: By ensuring silver ions are in excess
⩥ How does the number of moles of AgNO3 correlate to the number of
moles of the alkaline earth metal chloride?
Answer: There should be twice as many as moles of AgNO3 as XCl2
⩥ How many moles of AgNO3 should we use to be sure that we have
excess, no matter which of the three compounds it is?
Answer: 0.100 mol
⩥ Which of the following answers is NOT a valid reason for the
percentage yield of the reaction being below 100%?
, The unknown compound contained some impurities
The product is not completely dry
The precipitation was not complete
Some product was stuck on the filter paper
Answer: The product is not completely dry
⩥ What defines organic compounds?
Answer: Compounds that contain carbon
⩥ Wha is the carbon valence value?
Answer: 4
⩥ When carbon binds to four other distinct atoms, what is the angle of
the carbon bonds?
Answer: 109.5 degrees
⩥ Which of the following statements are true for CH4,H2CO, and CO2?
The valence of carbon is changing
They are all organic molecules
The angle of the carbon bonds is different
The carbon atoms are different sizes
Answer: The angle of the carbon bonds is different
NURSING MIDTERM EXAM SCRIPT
COMPREHENSIVE QUESTIONS AND
CORRECT ANSWERS ALREADY PASSED
⩥ Why is it important to use demineralized water?
Answer: Demineralized water doesn't contain minerals
⩥ In order for gravimetric analysis to be valid, we want all of the
chloride ions to precipitate. How can we ensure this?
Answer: By ensuring silver ions are in excess
⩥ How does the number of moles of AgNO3 correlate to the number of
moles of the alkaline earth metal chloride?
Answer: There should be twice as many as moles of AgNO3 as XCl2
⩥ How many moles of AgNO3 should we use to be sure that we have
excess, no matter which of the three compounds it is?
Answer: 0.100 mol
⩥ Which of the following answers is NOT a valid reason for the
percentage yield of the reaction being below 100%?
, The unknown compound contained some impurities
The product is not completely dry
The precipitation was not complete
Some product was stuck on the filter paper
Answer: The product is not completely dry
⩥ What defines organic compounds?
Answer: Compounds that contain carbon
⩥ Wha is the carbon valence value?
Answer: 4
⩥ When carbon binds to four other distinct atoms, what is the angle of
the carbon bonds?
Answer: 109.5 degrees
⩥ Which of the following statements are true for CH4,H2CO, and CO2?
The valence of carbon is changing
They are all organic molecules
The angle of the carbon bonds is different
The carbon atoms are different sizes
Answer: The angle of the carbon bonds is different
