General Questions and Answers

Question 1 Balance the following equation KOH H O Answer number H PO4 How many grams of H O will be produced from 5 57x1022 molecules of H PO4 and compound What type of chemical reaction is this synthesis decomposition single replacement or double replacement with units K PO4 8 pm

If we begin with 6 00 mg of iodine 131 t1 2 8 07 hr how much remains after eight half life periods i mg

Which of the following elements has the smallest first ionization energy O Rb Mg OI O As

2 You have 0 350 L of a KOH solution of unknown concentration It takes 0 070 L of 0 10 M HBr to titrate to pH 7 What is the concentration of the NaOH

Calculate the AH of the oxidation of glucose pictured below during human metabolism C6H12O6 aq 6 O g 6 CO g 6 H O l Glucose CH OH H HO C H O CIH OH 0 H H C OH OH C H

Draw the triacylglycerol that would be formed by applying the generic reaction formation of an ester to glycerol and three fatty acids Use glycerol once and each of the fatty acids once HO HO OH HC OH

In volumetric titration of Na2CO3 analyte with HCI titrant using pH sensitive indicator to measure the indicator correcti A C titrant is titrated against the analyte only B A titrant is titrated against the solvent without analyte C B titrant is titrated against the solvent with analyte D D Both A and C

Metal Calcium Iron Silver Gold O Calcium Gold O Silver Specific Heat J g C O tron 0 647 After absorbing 0 500 kJ of energy a 55 5 g sample of an unknown substance has a temperature increase of about 14 degrees Celsius Identify the subs 0 449 0 235 0 129 O The substance is not listed

The molecule SiH is non polar Select the IMF s that it can participate in London dispersion force OH bonds

Select the gas that would have the highest average molecular speed Assume all are at the same temperature Argon Carbon tetrafluoride O Dinitrogen monoxide O Neon O Nitrogen dioxide O Sulfur dioxide

A 12 2 M solution has a volume of 4 0 L The volume is doubled by adding water What is the final molarity of the solution Answer M

8 In transition state theory Describe the meaning of the transmission coefficient If the transmission coefficient is less than one what does it tell you about the kinetics of your chemical reaction Use at least one equation to justify your answer

5 Describe the four laws of thermodynamics Where possible use an equation in your description

What kind of substances do not dissociate into ions O lonic compounds with polyatomic ions O Molecular covalent compounds O lonic compounds with no polyatomic ions O Acid and bases

dissociation of AI NO3 3 into ions when dissolved in water Identify the ions and their coefficients on the product side of che equation Tap on each field to select formulas and coefficients AI NO3 3 s aq aq

What is the geometry about a carbon atom that forms one single bond and one triple bond linear Otrigonal planar 0 0 tetrahedral

Which structure is not an isomer of CH3 CH CH CH2 CH CH3 A B C D CH CH CH CH CH CH CH CH CH CH CH CH CH C CH A CH CH CH None of the above all are isomers of the compound above

How are the alkynes different from alkanes A B Alkynes are hydrocarbons that contain three or more carbon atoms when alkanes can t contain more than two carbons Alkynes are hydrocarbons that contain at least one triple bond between carbon atoms when alkanes should not have C Alkynes are hydrocarbons that cant contain double bonds between carbon atoms when alkanes should contain at least one triple bond Alkynes are hydrocarbons that can t contain double bonds between carbon atoms when alkanes should contain at least one double bond C D B A C D C bonds of order greater than one

Which term could not be applied to the compound shown HO CCH CH CHCH3 aromatic an acid organic unsaturated

Name the compo CH CH CH CH CH CH3 CH CH O A 3 4 diethyl 2 methylundecane B 3 4 diethyl 5 methylhexane C 3 4 diethyl 2 methylhexane 3 4 dimethyl 5 ethylhexane C CH CH A CH3 B

the balanced equation that descri dissociation of iron III sulfate into ions when dissolved in water Identify the compound s formula and the ions and their coefficients on the product side of the equation Tap on each field to select formulas and coefficients s aq aq

What is organic chemistry Organic chemistry is the study of carbon containing compounds and their reactions Organic chemistry is the study of nitrogen containing compounds and their reactions Organic chemistry is the study of the compounds which can be obtained only from living organisms and their reactions Organic chemistry is the study of the compounds which can be founded in living organisms and their reactions

Which compound is 2 3 dimethylpentane A H CCH CHCH CH3 CH3 CH3 B C U H C CH CH CH CH H C CH CH CH CH CH H C CH C CH CH CH QA H C CH OB C

Determine the product of the reaction CH3 CH CH CH2 CH3 H A CH3 CH CH CH3 B CH3 CH2 CH2 CH2 CH3 C CH3 CH CH CH3 D B CH3 CH CH CH2 CH3 A

What is the balanced chemical equation for the combustion of butane A CH3CH CH CH3 9 CH3 CH CHCH3 H g B CH3CH CH CH3 g 9 O2 g 4 CO2 g 5 H O g C CH3CH CH CH3 9 4C 5 H g 2 CH3 CH CH CH3 g 13 O2 g 8 CO2 g 10 H O g D D COA B

8 4 g kcl many grams of potassium chloride are needed to prepare 75 mL of a 1 5 M solution of potassium chloride in water 3 What is the molarity of the solution produced when 85 6 g of hydrochloric acid HCI is dissolved in sufficient water to prepare 385 cm of solution 6 10 4 To produce 3 0 L of a 1 9 M solution of sodium hydroxide how many grams of sodium hydroxide must be dissolved 5 If 8 77 g of potassium iodide are dissolved in sufficient water to make 4 75 L of solution what is the molarity of the solution 6 In order to prepare 50 0 mL of a 3 0 M solution of ferric III chloride how many grams of ferric III chloride must be used 7 What is the molarity of the solution produced when 14 1 g of ammonia NH3 is dissolved in sufficient water to prepare 100 mL of solution

Identify an aromatic organic compound a H C CH3 b H3C HC C C CH3 CH3 c H C HC CH C O CH O d H C CH CH C CH CH 10 m CH3 e H3C CH CH CH b CH C 0 CH d L CH

Provide an example of an alkene addition reaction A CH CH CH3 g Cl g CH CH CHC12 9 B CH CHCH3 9 Cl2 g CH CICH CH Cl g CH CH g Cl2 g CH CICH Cl g CH CH g Cl2 g CH3CHC12 g C D OC

From the group below identify ether CH3 CH3 TI c H C HC C CH CH CH3 CH3 CH3 f H C HC C C CH3 CH3 e a CH3 b H C HC CH NH CH CH CH a HC CH HC CH OH CH CH e H C HC CH O CH CH3 CH d H C HC CH C OH CH3

What are hydrocarbons 2999 Hydrocarbons are compounds that contain only carbon and hydrogen atoms Hydrocarbons are compounds that contain only carbon oxygen and hydrogen atoms Hydrocarbons are the mixtures of water and powdered coal Hydrocarbons are the compounds obtained in the react

What are alkenes A Alkenes are hydrocarbons that contain at least two double bonds between carbon atoms B Alkenes are hydrocarbons that can t contain double bonds between carbon atoms C Alkenes are hydrocarbons that contain only two carbon atoms Alkenes are hydrocarbons that contain at least one double bond between carbon atoms D D OA

MISSED THIS Watch IWE 16 7 Read Section 16 4 You can click on the Review link to access the section in your e Text Use the half reaction method to balance each redox reaction occurring in acidic aqueous solution Part C NO aq Cr O7 aq Cr aq NO aq Express your answer as a chemical equation Identify all of the phases in your answer AEO xa x a b a b Review Constants Periodic Table X 129 X

Which compound is an alkene C10H20 A B C11H20 C C9H20 A

Which compound is most likely to have a foul odor A B CH3CH NH2 C D B A OC CH3CH COOCH3 CH3CH OCH3 CH3CH CH CH CH OH

What are the coeffients to balance the reaction NaOH HC2H302 NaC H302 HOH O 1 2 2 1 O2 1 1 2 O 1 1 1 1 1 2 1 1

Identify the functional group in the molecule shown The group is indicated with 1 H C ketone amine aldehyde alcohol O 1 1 CH3

A chemist measures the amount of chlorine gas produced during an experiment She finds that 83 8 g of chlorine gas is produced Calculate the number of moles of chlorine gas produced Round your answer to 3 significant digits 0 mol 0x10 C

Provide an example of an alkyne addition reaction A CH CH g H g CH3 CH g B CH CH g Cl g CHCI CHCl g C CH CH CH3 g 2Cl2 g CHC12 CH CHC12 9 CH C CH g Br2 1 CHBr CH CH Br g D OB A

Its are quite an planet Mayedup he atomic masses are different than on planet Earth Use the link to view the est most up to date and only existing Periodic Table for planet Mayedup Use it O determine the molar mass of the compound Ax2Op3 2 XoLb2 3 Tap on table cells to enter or edit an answer And for best results avoid early rounding and enter mass values to at least three significant digits Element Total of Atoms Mass of All Atoms g mol Ax Op Xo Lb Molar Mass of Compound and

8 To prepare 75 cm of a 2 5 M solution of potassium hydroxide how many grams of potassium hydroxide must be used 9 The average concentration of sodium ions Na in human blood serum is about 3 4 g per liter What is the molarity of Na 10 Some sweeteners contain saccharin C H NO S Determine the molarity of a 250 mL iced tea solution containing 0 75 g of saccharin 11 Find the amount of AgNO3 needed to make 375 cm of a 0 75 M solution 12 How many kilograms of table sugar C12H22O11 will be needed to make 3 5 L of a 1 15 M solution 13 How many grams of copper II sulfate pentahydrate will be needed to make 75 0 mL of 0 25 M solution 14 Determine the volume of 0 25 M NaHCO3 needed to react with 5 0 g of H SO4 and produce Na2SO4 CO2 and H O The unbalanced equation is NaHCO3 H SO4 Na2SO4 H O CO

20 4 points When a sample of gas with a volume of 637 9 mL and a pressure of 0 977 atm was heated from 16 78 C to 53 28 C its volume become 697 1 What was its final pressure in atm Keep the answer with 2 decimal places Do not write unit in answer

In order for the Combined Gas Law to be used what variable must be the same under both sets of conditions pressure P V and T must all be constant the amount number of moles of gas volume

19 4 points Which of the following statements are TRUE about COCI molecule select all that apply wrong choices will be penalized Hint Draw Lewis structure There are 3 total electron domains around the central atom The hybridization of the central atom is sp The molecule contains pi TT bond The electron pair geometry around the central atom is tetrahedral The molecule is polar The molecule is nonpolar The central atom contains one lone pair The central atom is carbon C The electron pair geometry around the central atom is trigonal planer The molecular geometry around the central atom is trigonal pyramidal The angles between the bonding pairs are around 120

O H H 0 II H3 0 C C C S O H6 I H4 Hs 0 All of the hydrogen atoms are numbered Which one s are NOT acidic A 1 2 4 5 B all of them C 3 and 6 D 6 E 2 and 5

The following is a property of acids bases or neither Tastes bitter and feels soapy A acids B bases C neither D both

How many mL of 12 26 M HCI are needed to prepare a 136 7 mL of 3 20 M HCI Keep the answer with 1 decimal place Do not write unit in answer Type your answer 4 points Fased on the best Lewis structure from formal charge considerations how many resonance structures if any can be

The following is a property of acids bases or neither Produce CO from NaHCO3 O A acids B bases C neither D both

Consider the following redox reaction Cu s 2NO3 aq 4H aq Cu2 aq 2NO g 2H O aq ts Which of the following statements are true select all that apply wrong choices will be penalized H reduced to H O Cu oxidize to Cu Oxidation number of Cu2 is 2 Oxidation number of N in NO3 is 5 Oxidation number of N in NO2 is 4 Oxidation number of H is 4 Cu is the reducing agent NO3 reduced to NO2 Oxidation number of N in NO3 is 1 NO3 is the oxidizing agent Oxidation number of Cu is 0 00 1700 i 730 7 to

In order for the Ideal Gas Law to be used which units must be used in calculations select all that apply wrong choices will be penalized Amount of gas must be expressed in grams Temperature must be expressed in K Volume must be expressed in mL Temperature must be expressed in C Pressure must be expressed in atm Volume must be expressed in L Pressure must be expressed in Pascal Amount of gas must be expressed in moles

What is the formula for nitrous acid A H CO3 B H SO4 C HNO2 O D HNO3 E HCI