CHEM 162 EXPERIMENT 5 ASSESSMENT UPDATED ACTUAL EXAM QUESTIONS CORRECT ANSWERS GRADED A PLUS

CHEM 162 EXPERIMENT 5 ASSESSMENT UPDATED ACTUAL EXAM QUESTIONS
CORRECT ANSWERS GRADED A PLUS
CHEM 162 Experiment 5 Assessment 2026/2027
Questions and Answers Verified Solutions Latest
Update

Question:
Pre-Lab 1 Q2 What units can you measure density in?

Answer:
two answers: a- the mass can be in units of kg or g b- the volume can be cm^3 or mL or L



Question:
Pre-Lab 1 Q3 If a metal has a mass of 95.6 g and a volume of 67.4 cm, then what is the density of
the metal?

Answer:
1.4183976261127595



Question:
Pre-Lab 1 Q4 The graduated cylinder displayed contains several liquids of varying densities. Name
the color that represents the liquid with the greatest density.

Answer:
Purple



Question:
Pre-Lab 1 Q5 Which of the following represents a physical property?

Answer:
Mercury is a silvery liquid at room temperature

,Question:
Pre-Lab 2 Q1 This graph represents __.

Answer:
Boyle's Law



Question:
Pre-Lab 2 Q2 Given the temperature, pressure, and volume of a gas it is possible to calculate the
number of moles present using the Ideal Gas Law.

Answer:
True



Question:
Pre-Lab 2 Q3 If the volume of a confined gas is doubled while the temperature remains constant,
what change (if any) would be observed in the pressure?

Answer:
It would be half as large



Question:
Pre-Lab 2 Q4 You experimentally determine the gas constant as 0.0961 L•atm/mol•K. What is the
percent error in your measurement? (The accepted value of R is 0.0821 L•atm/mol•K).

Answer:
17.05



Question:
Pre-Lab 2 Q5 Which glassware is not needed in the Gas Constant experiment?

Answer:
buret

,Question:
Pre-Lab 2 Q6 The purpose of washing Mg ribbon before weighing the Mg is to

Answer:
remove MgO coating



Question:
Pre-Lab 2 Q7 In Part II of this experiment, gas bubbles should come out of the gas hose into the side
flask.

Answer:
True



Question:
Pre-Lab 2 Q8 One mole of an ideal gas occupies 22.4 liter (at 273K and 1 atm), what will be the new
temperature (K) at 0.059 liter and 700 atmospheres?

Answer:
503



Question:
Pre-Lab 2 Q9 Mg(s) + 2HCL(aq) = MgCl2(aq) +H2(g), if 0.48 g Mg is used in the reaction, how
many mL of (at a pressure of of 1 atm at 25°C) can be produced? Mg = 24.3 g/mol, R=0.0821
atmxLmol^-1xK-1

Answer:
483



Question:
Pre-Lab 2 Q10 If the volume of H2 produced in the experiment is 73.0 ml, the pressure is 745.6 torr,
the temperature is 25.5 °C, moles of H2 is 0.003, what is the gas constant R in the unit of
L•atm/mol•K?

, Answer:
0.0799



Question:
Post Lab 2 Q12 The equation for the reaction of magnesium ribbon and hydrochloric acid is Mg(s) +
2HCL(aq) = MgCl2(aq) +H2(g If 1.53 g magnesium reacted, how many moles of hydrogen gas was
produced? Report your answer to three significant figures.Mg = 24.3 g/mol

Answer:
0.065



Question:
Post Lab 2 Q13 Calculate the gas constant, R, if 25.55 mL of hydrogen gas was collected at a
barometric pressure of 0.987 atm and a temperature of 295 K. The vapor pressure of water at this
temperature is 0.026 atm. Record your answer to four significant figures. 22.4 L= 1 mole of gas.

Answer:
0.074



Question:
Post Lab 2 Q14 According to Boyle's law, the volume of a gas is inversely proportional to its
pressure at constant temperature.

Answer:
True



Question:
Post Lab 2 Q15 If temperature is constant, the relationship between pressure and volume is

Answer:
inverse