General Questions and Answers

generate oxygen gas What is the theoretical yield of O2 32 00 g mol if 500 0 g KO2 reacts with excess H O 18 02 g mol 225 0 g 168 8 g 375 0 g 675 1 g 56 26 g Question 4 1 point 1 Listen What is one of the products of a combustion reaction oxygen water 4 KO s 2H O l 4 KOH s 30 g Ohydrogen O none of them

Calculate the average valence electron energy AVEE for oxygen O using Table 3 4 in your text 3 44

9 You collected mL of gas at C and been collected if the room conditions were at STP Show your work 3 kPA What volume of gas would have 10 State and explain the effect the following would have on the measured volume of gas collected Performing this experiment at a much higher altitude 2

What can be inferred from the difference in men having pockets to carry their women having no such pockets from the following statement from the essay On Pockets and Things by A G Gardiner O It represents the lifestyle of people O It represents a social Issue O It depicts women in a good way None of the choices

5 2 NF3 sample is used Question 10 1 point Listen In one type of fuel cell methanol CH3OH enters on one side of the unit and air enters on the other side Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity Which chemical equation best represents the reaction that occurs CH OH CO g 2H O 2 CH OH 30 g 2 CO g 4H O l CH OH 8 SCH GtH De

Question 8 1 point 4 Listen Water can be separated into its elements according to the following equation by electrolysis If 20 0g of water is decomposed by this method how much oxygen gas is produced 10 0 g 17 8 g 16 0 g 2 H O g 2 H2 g O2 g

Are electrons particles or waves Explain your thinking Please make sure that your answer is written in your own words 4 marks

A particular liquor is 40 0 ethanol CH3CH OH by volume Calculate the concentration of ethanol in mass percent The density of ethanol is 0 789 g mL the density of water is 0 998 g mL assume the volumes are additive Your Answer

Owood burning Oiron rusting gasoline evaporating 0 dynamite exploding Question 2 1 point Listen Which statement about the following chemical reaction is NOT correct 3 H g N g 2 NH g For every nitrogen molecule consumed two molecules of ammonia are produced For every 6 06 g of H consumed two moles of NH3 are produced If 34 0 g of NH3 are produced 28 0 g of N were consumed In order for 56 g of N to completely react 18 g of H would be required

How many electron groups are on the central atom Express your answer as an integer

An aqueous solution contains 0 329 M hypochlorous acid How many mL of 0 343 M potassium hydroxide would have to be added to 125 mL of this solution in order to prepare a buffer with a pH of 7 850 mL

Read the following lines from The Tell Tale Heart Villains I shrieked dissemble no more I admit the deed tear up the planks Here here It is the beating of his hideous heart What does the beating heart symbolize in the excerpt above O The murder of the old man O The police identifying the culprit The narrator s guilt

QUESTION If 3 moles of Na3PO4 react with 3 moles of Cu NO3 2 how many moles of excess reactant will remain after the reaction is complete 2 Na3PO4 3 Cu NO3 2 Cu3 PO4 2 6 NaNO3 6 moles of excess reactant 1 mole of excess reactant The reaction does not have any excess reactant 3 moles of exces reactant

1 Elemental mercury was first discovered when a mercury oxide was decomposed with heat forming mercury metal and oxygen gas When a 1 048 g sample of the mercury oxide is heated 0 971 g of mercury metal remains Note Do not attempt this experiment in the laboratory because of the release of toxic mercury vapor a What is the mole ratio of mercury to oxygen in the sample b What is the empirical formula of the mercury oxide Desk No

C H6 Express your answer using four significant figures mors 6 VAZ C

2 A 2 60 g sample of titanium chemically combines with chlorine gas to form 10 31 g of a titanium chloride a What is the empirical formula of titanium chloride b What is the percent by mass of titanium and the percent by mass of chlorine in the sample

4 Calculate the yield of the gas produced in the reaction based on volume show formula 2

6 Ition or the presence of predators bad for a population Explain why or why not 7 Explain how emission from a coal burning power plants may lead to acid rain What is eutrophication and how does it affect the balance of organic matter within the water 8 What is the difference between bioaccumulation and biomagnification 9 a Discuss three ways in which we can reduce water pollution b Discuss three ways in which we can reduce the pollution of our air

Reaction of Metals with HCI The pressure of a gas is 759 3 mm Hg What is the pressure in atmospheres a 1 08 atm b 0 9991 atm c 1 00 atm d 1 001 atm

Carbon 14 decays exponentially with a half live of 5700 years a Find the value of r in A t agert for t in years Give the exact value and a decimal approximation b An Egyptian mummy is discovered in which the amount of carbon 14 present is only about two thirds the amount found in the atmosphere How long ago was the mummy buried

1 Consider the Molecule cis PtF2 CO 2 Show how group theory can be used to find our IR and Raman spectra for the C O group stretching groups only

ou were a businessman looking for a way to appropriate land for your own commercial ven North America what way would your colony have to be set up O Royal O Proprietary O Free enterprise O Charter

What is the hydronium ion concentration in a solution with a pH of 2 80 Select one O a 6 3 x 102 M O b 4 8 x 10 8 M O c 1 6 x 10 M O d 6 3 x 10 M

Write the complete and balanced equation for the combustion of C3H8O Take an image of your hand written work Upload the file Important 1 point for each correct compound There are four 1 point for each correct coefficient There are four If the coefficient is 1 you must include this number in your balanced equation Your answer must be hand written on paper Typed answers or images will not be accepted

Determine the empirical formula of aspirin Express your answer as a chemical formula

Consider the decomposition of N O4 g into NO g N O4 g 2 NO g Kp 47 9 at 400 K Suppose that 1 00 atm of N O4 decomposes and reaches equilibrium at 400 K Determine the partial pressure of NO at equilibrium hint use quadratic O 0 922 atm 0 960 atm O 0 979 atm O 1 92 atm O 1 86 atm

Lithium carbonate and iron III chloride will undergo a double replacement reaction producing lithium chloride and what else Li CO3 FeCl3 0 0 0 0 0 iron III chloride iron III lithium chloride lithium ionide iron III carbonate lithium carbonate LICI

What does the doublet rule state Select one O a Atoms will become more reactive and chemically bond with noble gases O b H and He become more stable with two electrons in their outer energy leve Oc Atoms become more stable with eight electrons in their outer energy level O d Atoms will change their configurations and become a noble gas

A chemistry teacher is measuring out 607 0 g of dextrose C6H12O6 for a lab How many moles of dextrose is this equivalent to Round your answer to the nearest thousandths place

1 82 mol C8 H18 Express your answer in moles to three significant figures

C HCl 120 97 g mol Express your answer as a chemical formula

C HC1 120 97 g mol Express your answer as a chemical formula

Which compound below has the smallest dipole moment CF2Cl2 CF3CI CF4 CFCI 3 CHFCI 2

Express your answer in moles to three significant figures nH Submit Part B VA o f Request Answer C 1 2 mol CH4 Express your answer in moles to two significant figures mol

Identify the molecular geometry of CIF linear O trigonal planar O bent O tetrahedral O trigonal pyramidal O seesaw O T shaped O octahedral O square pyramidal

What is the empirical formula of phosphorus bromide Express your answer as a chemical formula

click on the Review link to access the section in your e Text Part A The sodium ion is a dietary mineral essential to good nutrition Sodium is necessary for the binding of adenosine triphosphate an organic compound that provides energy to drive many processes in living cells with potassium The main dietary source of sodium is table salt sodium chloride The recommended daily allowance RDA for sodium is 1 50 106 g day How much sodium chloride 39 34 Na should be consumed to meet the RDA Express your answer in micrograms to three significant figures V Ad

0 668 g Al 0 569 g As and 0 486 g O Express your answer as a chemical formula

Combustion analysis of a 13 42 g sample of the unknown organic compound which contains only carbon hydrogen and oxygen produced 39 61 g CO and 9 01 g H O The molar mass of equilin is 268 34 g mol Part A Find the molecular formula of the unknown compound Express your answer as a chemical formula 0 qual A O

MISSED THIS Watch IWE 4 18 Read Section 4 11 You can click on the Review link to access the section in your e Text The foul odor of rancid butter is due largely to butyric acid a compound containing carbon hydrogen and oxygen Combustion analysis of a 4 30 g sample of butyric acid produced 8 59 g co and 3 52 g H O Part A Find the empirical formula for butyric acid Express your answer as a chemical formula 0 A O

The iodide ion is a dietary mineral essential to good nutrition In countries where potassium iodide is added to salt iodine deficiency goiter has been almost completely eliminated The recommended daily allowance RDA for iodine is 1 50 x 10 g day How much potassium iodide 76 45 I should be consumed to meet the RDA Express your answer in micrograms to three significant figures

22 6 g 0 Express your answer in molecules to three significant figures VO A O Submit Part D Request Answer 02 molecule 20 9 g Cs H10 Express your answer in molecules to three significant figures

Rank the following ions in order of increasing nitrogen oxygen bond lengths NO NO NO3

7 1 g H O Express your answer in molecules to two significant figures V A O Submit Part B Request Answer H O molecule 418 g CBr4 Express your answer in molecules to three significant figures

Express your answer using four significant figures mass C AEO

Watch IWE 4 15 Read Section 4 Review link to access the section in your eText The elemental mass percent composition of aspirin is 60 00 C 4 48 H and 35 52 0 Part A Determine the empirical formula of aspirin Express your answer as a chemical formula A O B can click on the

Listen Select all polar molecules SF2 CC14 CO SF6

Which elements can have expanded octets Which elements cannot have expanded octets

CH4 Draw the molecule by placing atoms on the grid and connecting them with bonds Include all lone pairs of electrons i Q

Question 1 2 5 points Listen How many grams of copper are in 20 0 g of copper sulfate pentahydrate CuSO4 5 H O