General Questions and Answers

The density of a gas is dependent on its temperature True False

What does a dash represent in a bonding structure a An ionic bond b A shared pair of valence electrons c A bond d Any two electrons

5 Correctly match the terms listed on the left with the substances listed on the right More than one term may be used for each substance A element B compound C heterogeneous D mixture E homogeneous F pure substance G Solution Mg Fe mixed with sand saltwater water MgSO4

hiometry 10 points 225 g of Fe3O4 are reacted with 131 g of CO to form free iron and CO2 The balanced chemical equation for the reaction is Fe3O4 s 4CO s 3Fe s 4CO2 g a Calculate the expected mass of iron that would be produced from EACH reactant Which o iting ronotont

What is the IUPAC name for this compound OH CH3CH CH2 C CH3

Gas Stoichiometry Butane C4H10 g is used as fuel for camping stoves Write the correct balanced equation for the reaction before you start your calculations for the next question Give your answers in the textbox

The combustion reaction of methane is CH4 202 CO 2H O A HO 802 kJ mol What is the enthalpy change when 22 4 L of methane is burned at STP O 2250 kJ 802 kJ O 1604 kJ 401 kJ 802 kJ

According to Avogadro s Law at 25 C and 1 atm pressure 1 mole of O has the same volume as 1 mole of NH3 True False

OT Esters What is the IUPAC name for this compound

5 Tell whether each of the following elements is an inner transition metal noble gas alkali metal alkaline earth metal or halogen Then give its period and group numbers a calcium b cesium c fluorine d chromium e neon f silver 6 A column of elements in the periodic table is known as a 7 Identify the following elements a period 5 alkali metal b period 4 halogen c period 5 halogen d period 5 Group IB

Thermochemistry A Glucose reacts with oxygen to form carbon dioxide and water Write the correct balanced equation for the combustion of glucose to produce carbon dioxide and liquid water B Calculate the enthalpy change AHH Ran for the combustion of 15 00 grams of glucose C6H1206 to carbon dioxide and liquid water at 25 C and 1 00 atm pressure given the following data AHH glucose 1273 3 kJ mol AHH H O 1 285 8 kJ mol AHH CO 393 5 kJ mol AHH O 0 kJ mol Give your answers in the textbox how below or unload in the Exam Submission assignment

rrange the atom and ions from largest to smallest radius Largest radius Smallest radius Answer Bank

A ich of the following statements correctly explains the solvent solute relationship in the air we breathe B C Oxygen 20 D Carbon dioxide and other gases 03 Inert gases mainly argon 97 Water vaper The solvent in air is nitrogen because it is the greatest in quantity and all other components are the solutes There are no solvents nor solutes in air because air is a mixture of gases but not a solution since solutions cannot be in a gaseous The solvents in air are nitrogen and oxygen because they are the greatest in quantity and all other components are the solutes There are no solvents nor solutes because air is not a solution since its gases are not dissolved in any of its other gases

Which of the following reactions is an oxidation reduction reaction a CaCO3 2HCl CaCl H O CO NH4NO3 N O 2 H O b c AgNO3 KI AgI KNO3 d H SO4 NaOH Na SO4 2H O CaO SO3 CaSO4 e

What is the pH of a solution with OH 1 1 10 4 M O 10 0 As 10 0 4 0 4 0

The pain reliever Aspirin C H8O4 is produced by reacting salicylic acid C7H6O3 with acetic anhydride C4H603 Acetic acid CH3COOH is the other product of this reaction C7H6O3 aq C4H6O3 aq C H8O4 s CH3COOH aq a If the industrial manufacturing process used 189g of salicylic acid and 129g of acetic anhydride determine the limiting reagent 4 marks b What is the mass of Aspirin that is produced by the reaction 3 marks c The actual yield of reaction was 186g of Aspirin What is the percentage yield 2 marks d Why would the company want to maximize the percent yield 1 mark e What is the unreacted mass of the

14 2 points Which ion has a noble gas conf 00 Fe3 Ti Ni2 Zn Sc3

13 Board What is the volume of a rectangular container that when filled with a gas has a mass of 1 875 Kg a length of 15m a width of 9m and a height of 7 900 mm 1 Point O 1066 m 3 10 660 m 3 1 066 m 3

C C C3 c How many and bonds are there in acrylonitrile bonds 4 Acrylonitrile H CH Acrylonitrile

1 Complete the reaction Mg OH Mg2 2 2 What is the pH of a 0 001000 M Mg OH solution first find the OH using stoichiometry 1 0000 x 10 M Mg OH X then find the H30 using Kw Kw H 0 mol OH mol Mg OH 11 there is complete ionization MOH

The energy levels of one electron ions are given by the equation En 2 18 10 18 where Z is atomic number and n is the energy level The series in the He spectrum that corresponds to the set of transitions where the electron falls from a higher level to the m state is called the Pickering series an important series in solar astronomy Calculate the Pickering series wavelength associa with the excited state n 9 visible In which region of the electromagnetic spectrum does this transition fall ultraviolet infrared X ray J microwave radio Z n

What is the hybridization of phosphorus in each of the molecules or ions CIPCI CI sp O sp sp P sp sp 0 CP P O sp 0 sp O sp Osp sp 0 0 05 P

9 87 g NH3 reacts completely with excess CO2 2NH3 g CO2 g CN2 OH s H O e If 13 74 g of CN2 OH Urea are produced during a lab what is the percent yield A 79 43 B 64 78 C 98 04 D 83 12

QUESTION Write the IUPAC name for CHCH CH CNH IUPAC name

Mrs McCormick has acute psychosis and is being treated with chlorpromazine hydrochloride Thorazine 15 mg four times per day What is her total daily dose of Thorazine in mg Report answers with appropriate decimal places for professionals to dispense

We now turn to the quantity of heat energy transferred This is given by q specific heat x mass x temperature change What is the mass of the solution including the mass of the magnesium added 0 468 g Mg reacting 0 0193 mol Mg reacting g soluti

How many moles of HCI can be formed when 8 9 moles of molecular chlorine Cl react with excess molecular hydrogen H2 according to the reaction H g Cl g HCI g unbalanced equation Give your answer in 1 decimal

How many bonding arrangements does hydrogen have a 1 b 4 C 2 d 3

2 BaCl2 aq Na2 SO4 aq 2NaCl aq Ba SO4 s The theoretical yield of Ba SO4 is 58 35 g If 44 34 g of Ba SO4 are produced from the reaction shown above what is the percent yield of Ba SO4 58 359 Ba son Imole Ba soy Imole Na Soy 233 40 Ba S04 Imule B a sou 142 049N9 504 Imole Ba sou A 31 67 B 52 03 C 75 99 D 85 17

13 2 points Assuming that the separation between cations and anions in the lattice is nearly identical arrange the following ionic compounds in order of decreasing lattice energy AHLattice Highest Lattice Energy 3 4 1 2 9 9 d calcium chloride calcium oxide calcium nitride sodium chloride Lowest Lattice Energy

Name the element in the fifth period of the periodic table with 5 valence electrons clement name Name the element in the fourth period of the periodic table with six 4p electrons element name Name the element in the fifth period of the periodic table with two 5p electrons element name Name the element in the second period of the periodic table with 6 valence electrons

Directions For the following reactions write the complete ionic equation and the net ionic equation Make sure to include proper states of matter and balance All reactions are happening in water 9 Cu NO3 2 H S 1 Complete Ionic 11 Net Ionic 10 NaCl MgCO3 Complete Ionic Net Ionic H SO4 BaCl2 Complete Ionic Net Ionic 12 Cas K3PO4 Complete Ionic 1 Cus 2 HNO3 MgCh Na CO3 HCI BaSO4 Ca3 PO4 2 K S

What is the force that holds together covalent molecules a lonic b Electrostatic c Sharing of valence electrons d Nuclear

10 How many grams of carbon dioxide gas are there in a 45 1 L container at 34 C and 1 04 atm 11 At 120 C the pressure of a sample of nitrogen is 1 07 atm What will the pressure be at 205 C assuming constant volume

29 Which of the following equations when balanced represents the reaction shown in the model A C Al2O3 Al 02 AlBr3 Al Br2 MgCl2 Mg Cl Mg0 Mg 02

Write the balanced molecular equation and net ionic equation for the neutralization reaction between hydrochloric acid and strontium hydroxide Include the phase of each species molecular equation 2HCl aq Sr OH aq 2H O 1 SrCl aq net ionic equation 2H aq 2OH aq H O 1

Write a balanced half reaction for the oxidation of liquid water H O to gaseous oxygen O in basic aqueous solution Be sure to add physical state symbols where appropriate A

The H 30 of a solution with pH 9 7 is 9 7 M 1 x 109 7 M O O O O 2 x 10 10 M 5 x 10 5 M 9 7 x 10 1 M

12 2 points Calculate the formal charge of As in the following structure H O As O H O 5 4 O 1 O 1 O 3 O

The determination that a system is at equilibrium is made by measuring O The change in internal energy O The change in free energy The change in entropy The change in enthalny

Balance the following redox reaction in acidic solution 2 2 Mn aq Zn aq MnO s Zn s 2 2 Mn aq Zn aq MnO s Zn s

Question If CaCl is added to the following reaction mixture at equlibrium how will the quantities of each component compare to the original mixture after equilibrium is reestablished Ca PO4 s 3 Ca aq 2 PO aq Enter chemical formulas Ca PO and Ca PO4 2 For inputs requiring than one component use commas and only commas to separate chemical formulas do not type the word and or any other conjunction Do NOT include phase state information Do NOT include concentration brackets Provide your answer below The amount of increase s and the amount of decrease s

2 points Which of these Lewis symbols are incorrect select all that apply wrong choices will be penalized Ne 0 e CI b d Na O

How many bonds and lone pairs are on hydrogen a 1 0 b 4 0 c 3 1 d 2 2

a A 3 0 g sugar cube is dissolved in a teacup containing 250 g of water What is the percent by mass of the sugar solution b What is the percent by volume of a solution formed by mixing 25 mL of isopropanol with 60 mL of water c What mass of water must be added to 150 g of NaCl to make a 20 by mass aqueous solution

8 2 points Which of these Lewis symbols are incorrect select all that apply wrong choices will be penalized CI Ne B 0 a f e b c d Na e

7 Regular coffee has about 106 160 mg of caffeine per cup serving Calculate the number of moles milli moles mmoles and micromoles umoles of caffeine in each serving

A tire pressure gauge reads 33 0 pounds per square inch How many kPa is this Remember that multiple steps may be required in the conversion

Based on the amounts of starting materials used a cheimst calculates a possible yield of 216 6 g in a reaction However afte isolating her purified product she finds that she has only 191 2 g of products What is her percent yield for this reaction percent yield

18 2 points How many resonance structures if any can be drawn for the nitrate ion NO3 0000 234 1 no resonance