General Questions and Answers

If 2 0 g of S are combined with 4 0 g of O2 then SO3 are formed 2S 302 2SO3 b gra

3 Calculate the mass in grams of the copper produced MASS OF 100 ML BEAKER AND COPPER minus MASS OF EMPTY 100 ML BEAKER Show your work

A sample of wine is analyzed and is found to contain 5 2mL of alcohol and 31 7mL of water and other substances What is the concentration of alcohol in the wine

According to the data collected below from the Boyle s Law experiment Calculate the standar deviation of the P x V values Volume mL 5 7 5 10 12 5 15 17 5 20 Answer to 4 decimal places Pressure kPa 205 6 137 1 102 8 82 3 68 6 58 8 51 5 P x V

V ml of 0 2 M Na2S2O3 is completely oxidised to sulphate ion with 0 4 M 40 ml of KMnO4 in faintly alkaline medium Find the value of V

During a titration 135 0 mL of H CO3 was required to neutralize 115 0 mL of 0 551 M KOH What is the concentration of the carbonic acid Balance the chemical reaction H CO3 KOH Answer M H CO3

What is the pH of a 0 031 M solution of aqueous Sr OH A 1 21 B 1 51 C 12 49 D 12 79

Which statement best describes general equilibrium A At equilibrium the reaction has stopped B There is only one set of equilibrium concentrations that equals the Kc value C At equilibrium the rate of the forward reaction is the same as the rate of the reverse reaction D At equilibrium the total concentration of products equals the total concentration of reactants

1 14 2 12 00 CHS 12 3 4 5 6 14 H 15 6 12 12 s 7 8 C 3 1 18 14 9 0 g ac S

Calculate the KOW and KOC for a compound given the following information 2 00 mmol of the compound were added to a shake flask containing 10 0 mL of octanol and 50 0 mL of water After shaking the of the compound in the octanol was determined to be 0 166M concentration

B 2 points According to Charles s Law at absolute zero temperature the volume of gas would be zero True False

Predict the products 13 Tricarbon octahydride combines with oxygen gas Type of reaction Predict the products 14 Solid Barium chloride is mixed with sulfuric acid Type of reaction Predict the products 15 Solid Magnesium metal is placed in a solution of nitric acid Type of reaction Predict the products 16 Sodium phosphate and Copper II chloride react Type of reaction Predict the products AlBr3 Type of reaction Predict the products 17 Cl2 me type of reactian

A it will be spontaneous at all temperatures B it will be non spontaneous at all temperatures C it will be spontaneous at high temperatures and non spontaneous at low temperatures D it will be spontaneous at low temperatures and non spontaneous at high temperatures E the absolute entropy of the products will be less than 0 ly 63 F Sunny

ame 8 10 1 7 5 Type of reaction Predict the products BaCO3 Type of reaction Predict the products B00 CO 6 Bromine gas is bubbled through a solution of Sodium iodide Type of reaction Predict the products 1 C4H10 02 1 Type of reaction Predict the products 9 Solid Zinc hydroxide breaks down Type of reaction Predict the products K CO3 Type of reaction Predict the products Cu 02 Type of reaction Predict the products Ca HCI Type of reaction

The combustion of methane in oxygen is spontaneous at 25 C CH4 g 202 g CO g 2H O 1 What then is also true at 25 C A AG 0 and K 1 B AG 0 and K 1 C AG 0 and K 1 D AG 0 and K 1

Results Component Retention 0 416 0 526 0 783 Area 126 2704 158 6535 185 1210 470 0449 X External Units 0 0000 0 0000 0 0000 0 0000

Which atom is the smallest A carbon B nitrogen C phosphorus D silicon

es Carry out the following calculation and report the answer using the proper number of significant figures 38 251 x 73 1 Multiple Choice 0 10 2 80 x 2796 1 G

This is a cholesterol molecule ball stick labels How many alcohol groups are there in cholesterol B

If 91 5 mol of an ideal gas occupies 33 5 L at 83 00 C what is the pressure of the gas P

Experiment 6 Concentration of Acid in Vinegar How many mL of 0 298 M NaOH solution is required to titrate 7 mL of 0 316 M H SO4 solution Hint write the balanced acid base neutralization reaction Answer to 1 decimal place

For which of the mixtures will Ag2SO4 s precipitate 150 0 mL of 0 10 M Na2SO4 aq and 5 0 mL of 0 20 M AgNO3 aq 150 0 mL of 0 10 M Na SO4 aq and 5 0 mL of 0 30 M AgNO3 aq 150 0 mL of 0 10 M Na2SO4 aq and 5 0 mL of 0 40 M AgNO3 aq 150 0 mL of 0 10 M Na SO4 aq and 5 0 mL of 0 50 M AgNO3 aq

A HNO4 aq nitric acid B HNO3 aq nitrate acid C H SO4 aq sulfuric acid D H SO3 aq sulfate acid

Copper I ions in aqueous solution react with NH aq according to Cut aq 2NH aq Cu NH3 2 aq Kf 6 3 x 1010 Calculate the solubility in g L of CuBr s Ksp 6 3 x 10 in 0 33 M NH aq solubility of CuBr s

solution contains 0 0330 M Pb aq and 0 0330 M Sr aq If you add SO2 aq what will be the concentration of b2 aq when SrSO s begins to precipitate Pb

ball stick labels Cholesterol is mostly nonpolar O True False

Some polysaccharides have branched structures Indicate which of the following are branched Select all that apply Damylose Ocellulose O amylopectin glycogen

hat is the formula for the iron containing bound that is formed when copper 11 te and iron react FeSO or Fe SO ember if your answer to 3 above is r to your answer to 1 then the formula SO If however your answer to 3 e is closer to your answer to 2 then the la is Fe SO

Given unit Moles Desired unit 1 How many oxygen molecules are in 3 36 L of oxygen gas at STP 3 36 22 40 15 2 Find the mass in grams of 2 00 x 1023 molecules of F2 12 624 g 3 Determine the volume in liters occupied by 14 0 g of N gas at STP 4 Find the mass in grams of 1 00 x 1023 molecules of N Challenge Problem Aspartame is an artificial sweetener that is 160 times sweeter than sucrose table sugar when dissolved water It is marketed by G D Searle as Nutra Sweet The molecular formula of aspartame is C 4H N O5 a Calculate the gram formula mass of aspartame b How many moles are in 10 g of aspartame c What is the mass in grams of 1 56 moles of aspartame d How many molecules are in 5 mg of aspartame e How many atoms of nitrogen are in 1 2 grams of aspartame

Cu NO3 2 aq 2NaOH aq 3 CuO s H SO4 aq 4 CuSO4 aq Zn s 2 Cu OH 2 s Heat CuO s H O g Cu OH 2 s 2NaNO3 ac CuSO4 aq H O 1 ZnSO4 aq Cu s

4 A protons and neutrons B positrons and electrons C neutrons and electrons D electrons and protons

A MnO manganese II oxide B CUSO4 C Na3PO4 copper II sulfate sodium phosphate D CaF2 calcium fluoride

5 Give the balanced chemical equation that represents the reaction between the following acids and bases a HCl and NaOH 117 e mazinoman to ury 1 02 gaixum edaban noitios e to tulog galllod ai sgnato sell al m and NaOH

Zn s CuSO4 aq Cul s ZnSO4 aq In the above reaction if the actual yield of copper metal is 0 392 g and theoretical yield copper metal is 0 507 g calculate the percenta yield yield 0 773 77 3 0 199 None of the above

4 hillum in eo fand quales ode 11 08 Non obfting him Write the balanced chemical equation for the complete combustion of propionaldehyde C3H60 to estom 2

SLO 6a Given a description or formula students should be able to identify the attractive forces that are present SLO 6a Question Write your answers on a separate sheet of paper 6a 1 Identify ALL the attractive forces ionic ion dipole hydrogen bonding dipole dipole London forces is are present in the following compounds On the final exam you will be able to use a periodic table and list of polyatomic ions as a reference a Na CO3 H C CH3 b e H H C H H CICIC H H T H H C H C H H NH H 1 H CH3 HHHH T H C C C C H 111 HHHH f Mg C H O2 2

What is the limiting reactant when 10 0 g of carbon monoxide CO molar mass 28 01 g mol and 15 0 g of iron III oxide Fe O3 molar mass 159 70 g mol are allowed to react completely to form carbon dioxide CO and iron Fe Fe O3 s 3CO g 2Fe s 3CO2 g A CO B CO C Fe DEO

What is the mass in g of 0 935 mol of acetone CH3COCH3 The molar mass of acetone is 58 08 g mol A 0 0161 g B 54 3 g C 57 1 g D 62 1 g

What are two definitions of a base in aqueous solution A a proton donor and a substance that increases the hydrogen ion concentration in water B a proton acceptor and a substance that increases the hydrogen ion concentration in water C a proton donor and a substance that increases the hydroxide ion concentration in water D a proton acceptor and a substance that increases the hydroxide ion concentration in

The limiting reagent for a given reaction can be recognized because it is the reagent that A has the smallest coefficient in the balanced equation for the reaction B has the smallest mass in the reaction mixture C is present in the smallest molar quantity D would be used up first

Which is the equilibrium constant expression for the following reaction Fe2O3 s 3CO g 2Fe s 3CO g A K Fe CO Fe O3 CO B K CO CO C K Fe O3 CO Fe CO 3 D K CO CO

Classify the reactions as either decomposition formation or combustion a Brz C H CH Br2 b 2C H 502 4CO2 2H O G2HCl H Ch a atom

Above what Fe concentration will Fe OH precipitate from a buffer solution that has a pH of 9 92 The Ksp of Fe OH is 4 87x10 17 Fe

2 Write the balanced chemical equation for the formation of C H4O

Slatom on to get to amulov 4 How many oxygen atoms are in a Mg3 PO4 2 molecule

What is the theoretical yield of water in grams if 95 mL of 6 5 M Mg OH 2 reacts with excess HBr Reaction 2HBr Mg OH 2 2H O MgBr2 O 22 g O 11 O 5 6 g O 2 7 g O 1 2 g O 3 5 g

8 6 points A weather balloon has a volume of 50 00L at 27 0 C and 0 987 atm What would be the volume of this balloon when the pressure is 230 0 mm of Hg torr at a temperature of 20 0 C

What is the chemical formula for calcium nitrate Step 1 Identify the ions Step 2 Balance the charges M Step 3 Write the formula cation first using subscripts from the charge balance

Free Response Question Use the information below to answer questions 11 12 that follow Show ALL work to receive full credit Wood is mainly cellulose a polymer produced by plants One use of wood is as a fuel in campfires fireplaces and wood furnaces The molecules of cellulose are long chains of repeating units Each unit of the chain can be represented as C6H1005 The unbalanced equation below represents a reaction that occurs when C6H100s is burned in air 290101 C6H1005 02 CO2 H O heat 11 1 pt Balance the equation above Write the coefficients in the lines provided S CONS C6H 005 G 0 H 0 hoat

4 The mass of a flask filled with air is measured as 106 5817 g If the same flask has a measured volume of 259 8 mL then what is the mass of the completely empty flask density of the air 1 170 g L Density of Natural Gas 137