Preparation and Properties of Compounds Questions and Answers

What is the percent yield Answer Question 2 round to the nearest tenth nt viold in theoretical vield divided by 1 pt

Convert 13 875 mmHg to atm

Consider the following reaction describing the combustion of propane C3H8 g 5 O g 3 CO g 4 H O g If oxygen is consumed at a rate of 20 mol L 1 s1 what is the rate of production of water 08 mol L 1 S 1 O 12 mol L S 1 O16 mol L 1 S 1 18 mol L 1 S 1 O24 mol L 1 5 1

incompicte Lewis structure is shown below The structure only shows the atoms and how they are connected The molecule has a net charge of zero H II Emplete the lewis structure giving all atoms full octets If there is more than one way to do this draw resonance structures showing all possibilities If not est draw one Lewis structure Be sure to write in any non zero formal charges Click and drag to start drawing a structure

20 78 The K of ZnF is 3 0x1077 at 25 C What is AG Is it possible to prepare a solution that contains Zn aq and Flag at t standard state concentrations

In which of the following compounds does iodine have an oxidation state of 3 OHIO3 O HOI O NalO O Nal3

The endothermic reaction between carbon monoxide and diiodine pentoxide is written below 5 CO g 1 05 g 12 g 5 CO2 g Which of the following would increase the amount of CO O increasing the pressure O decreasing the pressure O increasing the temperature O decreasing the temperature

If 13 55 grams of HCI reacts with excess Mg at STP according to the reaction below what volume of H2 is produced Mg s 2 HCl aq H2 g MgCl2 aq

8 Place the following in order of decreasing molar entropy at 298 K A Ar N2H4 HCI C N2H4 Ar HCI B Ar HCI N2H4 D N2H4 HCI Ar

2 The following equation represents the reaction for formation of ammonia Sketch an enthalpy diagram for this reaction and label each axis PE and reaction coordinate as well as the reactants products activation energy and overall change in enthalpy in your diagram 8 pts H O g 2 Cl g 2 HOCI g AH 209 kJ

O Calculate using stoichiometry O Divide by 100 O Multiply by 100 Convert all values to percentages Question 4 4 pts In the chemical engineering lab last week the complete decomposition of 435 8 g of ammonium dichromate molar mass 252 1 g mol produced 101 1 g H O NH4 2Cr O7 s Cr O3 s N g 4H O g 1 What is the theoretical yield of water produced Select

Q Explain what are namomaterials and why their properties are different from micro and macro structures

6 Predict what would happen to the pH if a Weak acid was added to water b Weak base was added to water Strong acid was added to water d Strong base was added to water Weak acid was added to buffered solution f Weak base was added to buffered solution g Strong acid was added to buffered solution e h Strong acid was added to buffered solution

2 Balance the following redox reactions in a basic solution using the oxidation number method B I Mn 2 02 2 H Mn H O 1 2

Collecting Data from the Posted Virtual Lab Video Unknown Liquid Determination 1 Mass of dry flask foil and rubber band g 2 Temperature of boiling water C 3 Mass of dry flask foil rubber band and vapor g 4 Volume of 125 mL flask L 5 Atmospheric pressure atm Calculations 1 Amount of vapor nvapor mol 2 Mass of vapor mvapor g S Trial 1 776849 96F 17 950 139ml 76 cm 3 Molar mass of compound g mol 4 Average molar mass g mol 5 Standard deviation of molar mass Show calculations for trial 1 here for full credit Trial 2

D 5x104 J of heat are added 35 kg of water initially at 12 C What is the water s final temperature

7 How important are buffers to the proper functioning of cells

1 When an enzyme is exposed to an unfavorable pH the activity level a Increases b decreases c stays the same

Which of the following statements is false When the central atoms of oxoacids holds the same number of oxygen atoms the acid strength increases from bottom to top within a group When the central atoms of oxoacids holds the same number of oxygen atoms the acid strength increases from left to right within a period The strengths of binary acids decrease from top to bottom within the same group For a given central atom the acid strength of an oxoacid increases as the number of oxygens on the central atom increases O The strengths of binary acids increase from left to right within the same period

14 How much faster is the hydrogen peroxide degradation when it is catalyzed by catalase

Indicate whether the following processes are exothermic or endothermic Process CO2 CO2 g C3Hs g 502 g 3CO2 g 4H 0 C6H12O6 s 6C s 6H2 g 302 9 H O H O s Exothermic Endothermic

8 Consider the reaction Br Ch 2BrCl Keq 244 What are the equilibrium concentrations of each reactant and product if a 1 0 D container initially contained 3 14 mole each of Br2 and 12 Show all calculations 9 Write the Keq expression 1 X 15 62 45623 4 2 49 05 2 2

Consider again the titration of HC H3O2 with NaOH Let s say that you need to add 0 383 moles of NaOH in order for the indicator dye to change color How many moles of HC H3O2 must you have had to start

Describe the difference between a polymer and a copolymer A A polymer consists of two or more different monomers when a copolymer is made up of one type of monomer B When a polymer is formed the monomers bond to each other without the loss of atoms When a copolymer is formed the monomers lose an atom or group of atoms When a polymer is formed the monomers lose an atom or group of atoms When a copolymer is formed the monomers bond to each other without the loss of Catoms A polymer is made up of one type of monomer when a copolymer has two different monomers D o o D OA B

Use the Re How many significant figures are there in each of the following numbers 930 00 5 2771000 0 8

In the illustration The product that forms is The number of product molecules formed is The limiting reagent is The illustration to the left represents a mixture of carbon black and oxygen red reacting to form a product The number of atoms molecules in excess is

5 When grease and soap are mixed an emulsion forms Draw a picture to illustrate this Soap forms scum insoluble salts in hard water Which

How much heat in J is required to bring 4 25 grams of silver from 0 C to 235 C

8 Lipids are responsible for several features of biological membranes Explain how a high concentration of unsaturated hydrocarbon chains makes the membrane more fluid Explain why the presence of cholesterol decreases the

A specified quantity of an unknown gas has the volume of 19 4 mL at 22 C and 659 torr Calculate the volume at STP O 1 25 mL O 18 2 mL O 15 6 mL O 20 7 mL O none of these

hat is the formula for magnesium fluoride hat is the formula for aluminum sulfide hat is the formula for potassium iodide

Lipids are a diverse group of molecules of biologic origin that dissolve in nonpolar solvents Since these molecules are not grouped together on the basis of their structures it is difficult to remember the structures and functions of lipids As a group make a map that will help you remember the different classes of lipids

Using trends in lattice energy rank these from most negative lattice energy 1st to least negative lattice energy 4th KBr CaCl2 AICI3 TiO2 Choose Choose Choose 1st 2nd 1th

Which of these is held constant for bomb calorimetry O Internal energy of the sample O Pressure O Volume O Temperature

If heat flows into a system during a chemical reaction the reaction is considered Select heat will be a Select number If heat flows out of a system during a chemical reaction the reaction is considered Select and the heat will be a Select Select and the positive number

Match the term with its basic description Heat Work Pressure Internal energy Temperature Choose Choose Average kinetic energy of all particles in a system transfer of thermal energy The force of particles bouncing off of a force acting through distance Sum of all energy in

Incorrect Add curved arrow s to draw step 2 of the mechanism Modify the given drawing of the product as needed and show both products H C Edit Drawing H C CH

In a freezer 551 13 grams of water at 0 C is placed in an ice cube tray How much heat in kilocalories must be removed to form ice cubes at 0 C Hint the answer choice is either positive or negative depending on if the energy is absorbed or released Make sure to include the correct unit symbol with the answer choice The s h of water is one calorie per gram degree celsius the heat of fusion for water is 80 0 calories per gram The heat of vaporization for water is 540 0 calories per gram Oa 40 7 kcal Ob 54 1 kcal Oc 34 1 kcal Od 44 1 kcal Oe 44 1 kcal

Oforms a basic solution in water reacts vigorously with alkali metals to for is very reactive as a metal consists of diatomic molecules in elemen O is one of the group of the least reactive e Obelongs to a group consisting entirely of

2 Who is the O a a third party b the agency c the borrower d the lender mortgagee

In a chemical system at equilibrium it is true that O the rate of the reverse reaction exceeds the rate of the forward reaction the concentration of reactants equals the concentration of products the rate of the forward reaction exceeds the rate of the reverse reaction the rate of the forward reaction is equal to the rate of the reverse reaction

A mixture of helium and xenon gases at a total pressure of 775 mm Hg contains helium at a partial pressure of 295 mm Hg If the gas mixture contains 0 473 grams of helium how many grams of xenon are present ax

When a smoldering toothpick was inserted to a tube containing a gas the toothpick flared or reignited Which gas was this OH ON 02

Pyrophosphoric acid H4P207 is a tetraprotic acid Which of the following represent the second acid dissociation for pyrophosphoric acid O A H3P 2071 H O OH H4P207 OB H4P207 H2O H30 1 H3P207 1 O C H3P2071 H O H30 1 H P207 2 O D H P2072 H 0 OH 1 H3P207 1 O E H P2072 H O H30 1 HP207

1 What are the five senses 2 What are the 3 main types of receptors in the body 3 Explain how a stimulus travels to the brain 4 What is the difference between long term and short term memory 5 Describe one memory technique that you learned about

17 What is hypothecation a a pledge of a security without giving up possession b a pledge of collateral or security without giving up possession c an abstract term denoting ownership d a document that provides evidence of ownership or of holding title

Which of the 3 types of irony does this paragraph use Explain 3 In scary movies the character walks into a house and the audience knows the monster is also in the house TYPE OF IRONY Type here EXPLANATION Type here

20 Which of the following characterizes the type of state Utah is O a intermediate theory state O b mortgage theory state O c lien theory state d title theory state

6 In this experiment we have produced one type of soap from mainly unsaturated lipids What properties do you think would change in the soap if we varied the types of lipids

1 A 2 A 3 A It is It is It is substance is one that has UNPAIRED electrons that are ALIG a Slightly repelled in a magnetic field b Attracted to a magnetic field c Strongly attracted to a magnetic field The picture above that best depicts this type of substance is substance is one that has one or more UNPAIRED electrons a Slightly repelled in a magnetic field b Attracted to a magnetic field c Strongly attracted to a magnetic field The picture above that best depicts this type of substance is substance is one that has NO unpaired electrons a Slightly repelled in a magnetic field b Attracted to a magnetic field c Strongly attracted to a magnetic field