General Questions and Answers

Indicate whether each electron configuration below is correct or incorrect for the ground state Fill in the blanks by selecting of the given ion one option from each menu ab Part 1 3 points ab Part 2 3 points aby Part 3 3 points 9 points Ca 18 2s 2p635 3p6 Br 15 2s22p3s23p64s 3d 04p6 Fe3 1s 2s 2p63s 3p63d comoot

The threshold wavelength for the photoelectric effect for silver is 262 nm What is the work function Do for silver Do 7 59 x10 19 What is the maximum kinetic energy KEmax of an emitted electron if the incident light has a wavelength of 222 nm 14 X10 19

Convert the value for R 0 0834 L atm mol 1 K1 to one that has units of cal mol K 1 ROUND ANSWER TO 2 DECIMAL PLACES DO NOT INCLUDE UNITS 1 L atm 101 325 J 1 cal 4 184 J

A teacher asked students to observe a sealed balloon that was held over a pot of boiling water Students observed steam begin to surround the balloon and heat up the balloon The students observed that the balloon increased in volume as it was held over the water The teacher asked each student to provide an explanation of the phenomenon Samples of student explanations were recorded below Student Student A Student B Student C Student D Explanation The balloon is increasing in size because the gas particles in the balloon are getting larger Student B The balloon is increasing in size because the gas particles reacted to the balloon s material making it weaker The balloon is increasing in size because the gas particles in the balloon are slowing down and causing more collisions The balloon is increasing in size because the gas particles in the balloon are speeding up and hitting the side of the balloon with more force Which student s explanation correctly explains why the balloons increased in volume O Student A

Determine the molecular mass of a gas where 2 19 g occupies 0 99 L at standard conditions of temperature and pressure to THE NEAREST WHOLE NUMBER

4 Determine the maximum amount of grams of NH3 that can be produced when 2 00 grams of N reacts with 3 00 grams of H What is the limiting reactant

In the presence of aqueous ammonia cobalt III forms the complex ion Co NH3 6 Determine the molar concentration of free cobalt III ion in solution when 0 150 mole of Co NO3 3 is dissolved in liter of 2 50 Maqueous ammonia x 10 M Enter your answer in scientific notation

Write a balanced half reaction for the reduction of nitrate ion state symbols where appropriate O NO3 to gaseous nitrogen dioxide NO in acidic aqueous solution Be sure to add physica 0 0

Indigo is the dye used in coloring blue jeans The term navy blue is derived from the use of indigo to dye British naval uniforms in the eighteenth century The structure of indigo molecule is H H H H b How many o bonds exist in the molecule bonds How many n bonds exist in the molecule bonds H H a What hybrid orbitals are used by the carbon atoms in the indigo molecule orbitals VAN

6 234 56 grams of Octane CgH 8 are burned in an excess of Oxygen and 310 5 grams of Water are collected What is the percent yield of this experiment

Choose the doping material that will cause silicon to become a p type semiconduc O Te OB O Ge

A person who exercises regularly has 255 body fat by mass If this person weighs 35 lb what is the mass in kilograms of body fat Please make sure to include the correct unit symbols with the answer

How many of grams AlCl3 will be produced from 92 grams of Cl Be sure to balance the equation first and show all of your work AICI3 AlBr3 Cl Br

we above reaction the oxidation state of chromium changes from many electrons are transferred in the reaction 0 2Cr 2H H 0 2Cr

1 2 If I need 0 089 moles of ZnS for a reaction how many grams do I need to measure on the electronic balance How many moles is 64 9 grams of SO

Which of the following could cause your R value to be LOWER than the literature value for the constant MORE THAN ONE ANSWER CAN BE SELECTED volume too low temperature of gas is too high volume too high pressure is too high mass of metal is too high pressure is too low mass of metal is too low

For the system 2N0 g N O4 g AG 4 14kJ mol If the system was initialized using enough Nog to create a partial pressure of 0 458 atm and enough N Oy to create a partial pressure of 0 345 atm calculate the value of AG T 304K in kJ mol for these non standard conditions prevailing at the start

Why does a small particle size increased surface area generally cause a reaction to proceed faster Collisions occur with greater energy There are more collisions per second and the collisions are of greater energy There are more collisions per second only

The molecular views of three gaseous mixtures of helium He and nitrogen N gases are A He B N C Arrange the mixtures A B and C from the most dense to the least dense Most dense mixture B mixture C mixture A

Which of these materials is a good conductor at high temperature and a poor conductor at low temperature OS O Au O GaAs LaBa Cu306

Balance the redox reaction by inserting the appropriate coefficients redox reaction 2HNO3 H S 2NO S 2H O

Pure silver metal can be made using the reaction Cu s AgNO3 aq Ag s Cu NO3 2 aq a What coefficients would balance this chemical equation b How many moles of silver can be formed from 3 moles of copper Show all your work

Suppose you are helping another chemistry student with atomic structure and isotopes In a few sentences explain to the student what is the mass number of an isotope how do you determine or find the nuclear charge Z of an element how can you determine the number of neutrons in Kr 84

5 2 points Which of the following describes the second law of thermodynam AS system AS surroundings 0 AS system AS surroundings 0 AS system AS surroundings 0 AS system AS surroundings 0 AS system AS surroundings 0 AS system AS surroundings 0

6 7 2 points Which of the following statements describes the third law of thermody The enthalpy of the universe is decreasing The entropy of all objects is zero at OK The entropy of the universe is increasing The enthalpy of the universe is increasing The entropy of the universe is constant The entropy of the universe is decreasing The enthalpy of the universe is constant The entropy of a perfect crystal is zero at OK 2 points EPICTION

1 Define physical and chemical properties provide three examples of each discuss their reversibility and explain the fundamental differences between them

Example 5 The container holding the following reaction already at equilibrium has its volume suddenly reduced by half Which way will the equilibrium shift to compensate PC13 Cl PC15 Solution Since the volume went down this means the pressure went up The reaction will try to lessen the pressure by shifting to the side with the lesser number of gas molecules This means a shift to the right because for every PC15 molecule made two molecules are used up The lesser the total number of gas phase molecules in the container the lesser the pressure

Choose the substances which could be added to silica to make red glass O Manganese IV oxide O Copper II oxide O Calcium fluoride O Iron III compounds

Determine the percent yield Be sure that the chemical equation is balanced Assume that any reactants for which amounts are not given are in excess Cu s H SO4 aq CuSO4 aq SO2 g H2O l 4 00 g of copper gives 1 2 g of sulfur dioxide 10 20 O 30 40

How many grams of H O can be produced from the reaction that occurs between 8 0 g H and 19 0 g of O H O CL H O Please show all work and make sure to include the balanced chemical equation the amount of product that can be produced from each reactant and the limiting reactant

Uncooked lean ground beef can contain up to 11 fat by mass How many grams of fat would be contained in 3 42 lbs of the ground beef Please make sure to include the correct unit symbol with the answer Note 1 pound 453 59237 grams

equation Al O3 s NaOH 1 HF g Na3AlF6 H O g If 13 9 kg of Al O3 s 60 4 kg of NaOH 1 and 60 4 kg of HF g react completely how many kilograms of cryolite will be produced mass of cryolite produced Which reactants will be in excess Al O3 HF NaOH What is the total mass of the excess reactants left over after the reaction is complete kg Na AIF

Choose the material that is brittle a poor thermal conductor a good thermal insulator and can withstand high temperatures O Metals O Ceramics O Polymers O Composites

Select the general class of compounds you would expect to have the highest boiling poir Alkanes O Alcohols Aldehydes

0 55 mol Al SO3 3 reacts with 1 84 mol NaOH Al SO3 3 6 NaOH 3 Na SO3 2 Al O

The requirement for a spontaneous chemical reaction is correct choices will be penali choose your answer choose your answer AG AT AS choose your answer

easurements show that the enthalpy of a mixture of gaseous reactants decreases by 347 kJ during a certain chemical reaction which is carried out at a Onstant pressure Furthermore by carefully monitoring the volume change it is determined that 194 kJ of work is done on the mixture during the reaction Calculate the change in energy of the gas mixture during the reaction Be sure your answer has the correct number of significant digits Is the reaction exothermic or endothermic KJ O exothermic O endothermic X

An unknown gas at 53 1 C and 1 00 bar has a molar mass of 30 07 g mol Assuming ideal behavior calculate the density of the gas density 1 23 g

4 points Which of the followings are state functions Select all that apply Incorrect choices will be penalize Enthalpy Temperature Work Internal Energy Heat Gibbs free energy Entropy

Label the Parts of an Equation O B A 2 Mg 02 C 2 MgO E

Which one of these substances is not a network solid O Diamond O Brass O Quartz O Graphite

How many grams are in 1 8 moles of KCIO3

a Why do we need to balance chemical equations b What do the coefficients of the balanced equation tell you

8 A sample of 7 65 1025 molecules of BaF has a mass of how many grams

a What are the reactants in a neutralization reaction b What are the products in a neutralization reaction c Write a complete balanced equation for this neutralization reaction H SO4 ac KOH aq d Write a complete balanced equation for this neutralization reaction HCl aq LiOH aq

O ON CH 1st Atom AND 1500 2nd Atom STABLE NET 2100 AND 1 1500 NET ZERO vial 10 2 sucrose C 2H22O11 Max 1500g 0 1g g Max 1300 0 1 19 48 JANG UNITS AND 11500 STABLE NET zreo potassium carbonate Max 1500g 0 1g 21 7 g 8 What type of particle entity is present in your sample 1 mark 9 Calculate the number of particles entities present in your vial Make sure you include the correct entity in your units 2 marks UNITS 10 Depending on your sample type calculate the number of the first two atoms in your vial 4 marks e g For C8H22O15N3 you would calculate the number of C and H atoms

Aqueous solutions of potassium hydroxide and iron II chloride react in a precipitation reaction to form insoluble iron II hydroxide 2 KOH aq FeCl aq 2 KCl aq Fe OH s Rewrite this equation as a complete ionic equation Include phase notations complete ionic equation 2K 2OH Fe 2C1 2K 2C1 Fe OH What are the spectator ions in this equation CI OH Fe K Incorrect Incorrect Remove the spectator ions and rewrite this as a net ionic equation Include phase notations

An NaCl solution is made using 118 g of and diluting to a total solution volume of 1 30 L 1 55 M 1 6 M 1 550 M 1552 M

Sodium chloride decomposes to form sodium metal and chlorine gas according to the following equation How many moles of chlorine gas can be produced if 150 g of NaCl decomposes Be sure to balance the equation and show all of your work NaCl Na s Cl2 g

a What is the difference in a limiting reactant and an excess reactant b Which is more important in stoichiometry calculations and why