Gaseous and liquid states Questions and Answers

What phase transition is occurring between points D and E on the heating curve O melting O freezing O vaporization O deposition Temperature M 11 D Heat added 1

A 1 20 L weather balloon on the ground has a temperature of 25 0 C and is at atmospheric pressure 1 00 atm When it rises to an elevation where the pressure is 0 720 atm then the new volume is 1 80 L What is the temperature in C of the air at this elevation

IA Review Ideal Gas Law Combined Gas Law On the MC section of the IA you will not be able to use a calculator Challenge yourself to answer these questions without one Show all work in the box to the right 1 A 2 00 gram sample of helium at STP will occupy a 11 2 L b 22 4 L c 33 6 L d 44 8 L 2 A sample of oxygen gas 0 is held in a flexible 2 0 Work L container at 300 K with a pressure of 1 5 atm The container is pushed in until the container has a volume of 1 0 L The temperature remains at 300 K What is the new pressure a 0 5 atm b 1 0 atm c 3 0 atm d 4 5 atm 3 Determine the number of moles of oxygen gas described in question 2 To simplify your calculations approximate the R value to be 0 10 L atm mol K A 0 1 mol O B 0 3 mol O C 1 0 mol 0 D 3 0 mol 0 Work Reminder STP is standard temperature 273 K and pressure 1 atm At STP 1 mole of any gas occupies 22 4 L of volume TEACHER Work

Calculate the heat produced in kJ when 224gm of CaO is completely converted to CaCO3 by reaction with CO at 27 C in a container of fixed volume 2 O 3 Given AH CaCO s AH Cao s AH CO 9 A Use R 8 3 K 1 394 kJ mol s 635kJ mol 1207kJ mol mol 1 702 04 kJ Correct Answer

18 Fill in the blank The higher the intermolecular forces the the boiling point 19 True or False The IMF with the highest boiling points will have hydrogen bonding 20 Rank these substances from highest boiling point to lowest HCI CH H 0 NaCL Why did you choose this order the melting point and the

on thinks about ways he could increase the rate of the chemical eaction between calcium chloride CaCl and sodium bicarbonate NaHCO3 Which change would MOST LIKELY increase the rate of the memical reaction art B an A at 25 B C D use a sodium bicarbonate water solution that has a temperature of 30 C instead of 25 C hich statement BEST explains why this change would increase the use 5 grams of calcium chloride powder instelld of 10 grams use slow stirring instead of rapid stirring use a 1000 mL beaker instead of a 500 mL beaker C D Part B Which statement BEST explains why this change would increase the rate of the chemical reaction A B C use slow stirring instead of rapid stirring use a 1000 mL beaker instead of a 500 ml beaker D Molecular collisions would occur more often and with more energy Reactant and product molecules would be ckber together Product molecules would have more energy and become a gas Fewer molecular collisions would be needed to form the same amount of product

Determine Pxe in a container that has the following gases and respective pressures Pressure kPa Gas Xenon Helium Nitrogen dioxide TOTAL 77 3 52 0 248 8

Question 2 Determine the molarity of a solution with a volume of 435 mL and 0 550 mol of solute dissolved Answer Question 3 M Adding or removing water will change the concentration of a solution

2 0 mol of nitrogen gas at STP occupies what volume 44 8 L O 44 8 mol 44 8 mol L O 11 2 mol 11 2 L 11 2 mol L

A chemistry student reacted magnesium metal Mg and acetic acid in varying concentrations and temperatures The following data shows their results TrialAmount of Mg g Concentration of Acid Starting Temperature of Acid Time for Mg to React min Very Low 5 min Low 4 min Medium 3 min High 2 min 1 2 3 4 5 grams 5 grams 5 grams 5 grams 24 C 24 C 24 24 C Explain how the data from the table above supports the theory that connects molecular collisions to the time for the Mg to completely react In other words how does this data support Kinetic Molecular Theory and methods to increase the rate of reaction

98 4 kPa 0 58 alm X mm Hg 3

1 rt 2 0 78 atm LETE X mm Hg

22 What is the difference between London Dispersion forces and Dipole Dipole forces 23 Explain why ethanol C2H5OH has a higher boiling point 78 4 C than methanol CH3OH 64 7 C

A B Observe the balloons A and B above Both balloons have a temperature of 25 0 C contain 0 50 moles of gas sealed by the knot at the bottom and have a volume of 2 2 L If balloon A is placed in a freezer with a temperature of 5 50 C which of the following statements regarding the volumes of the balloons is accurate O The balloons will remain unchanged and have equal volume at 2 2L O Balloon A will be smaller due to fewer moles of gas in the balloon O Balloon A will be larger due to lower pressure inside the freezer Balloon A will be smaller due to the gas particles moving slower 11 12 13 14 15 16 Jhy 17 18 19 20 M

At 25 C the vapor pressure in equilibrium with a solution containing CS and CH3CN solvent has a total pressure of 263 mmHg The mole fraction of CS in vapor is 0 855 What is the mole fraction of CS in the solution At 25 C the vapor pressure of CS is 375 mmHg

A B Observe the balloons A and B above Both balloons have a temperature of 25 0 C contain 0 50 moles of gas sealed by the knot at the bottom and have a volume of 2 2 L If balloon A is placed in a freezer with a temperature of 5 50 C which of the following statements regarding the volumes of the balloons is accurate O The balloons will remain unchanged and have equal volume at 2 2L O Balloon A will be smaller due to fewer moles of gas in the balloon O Balloon A will be larger due to lower pressure inside the freezer Balloon A will be smaller due to the gas particles moving slower 11 12 13 14 15 16 Jhy 17 18 19 20 M