Practical Detection Questions and Answers

A person collects 11 52g of aluminum oxide in the lab after completing the reaction below If they calculated based on their reactants that they should have gotten 17 39g of aluminum oxide what is their percent yield Reaction 4Al s 302 g 2Al2O3 s

A metal alloy is made up of elements M and N The mass of a sample of the metal is 114 5 g Metal M is present in the sample with a mass of 42 5 g What is the percent m m concentration of metal N in the alloy

Dg Nuclear Change 1 Question 5 3 The missing product from this reaction is Select one O A O 1 O A O D 121 121 I 53 52 wp O C E B Te B Y 9 He C D n E e

Sample Problem Gaseous phosphorus pentachloride decomposes to chlorine gas and gaseous phosphorus trichloride as shown in the balanced chemical equation PCI PCIx0 Clx In a certain experiment at a temperature where K 8 96 x 102 the equilibrium concentrations of PCL and PCI were found to be 6 70 x 10 M and 0 300 M respectively Calculate the concentration of Cl present at equilibrium 1

53 Calculate the enthalpy change for the reaction P4O6 s 20 8 P4O10 s given the following enthalpies of reaction P s 30 8 P O6 3 Alf Pa s 50 8 5O2 8 P4O10 s P4O 0 s AH All 1640 1 kJ AH 2940 1 kJ

18 Write K expressions for each of the following equilibrium reactions If necessary do the problem on a separate sheet of paper and insert a photo of it in the designated space a b c d 2NaHCO s NaCO s CO 2 H O g

In the month of August your electric bill was 145 68 What is the hourly cost of electricity in your home The hourly cost for August was cents per hour Round to 5 decimal places I

Which of the following cannot form a solution O liquid solid O liquid gas Osolid solid O all of these can form solutions

A gas at a temperature of 35 C and a pressure of 1 75 atm has a volume of 1 5 L What is the volume if the temperature is increased to 55 C and pressure is increased to 2 1 atm Oa 1 33 L Ob 0 80 L O c 1 17 L d 1 69 L

The most rapid way to dissolve solids is to put them under pressure O use larg pieces O allow them to stand Ouse heat

How many moles of silver nitrate must be added to pure water to form 200 ml of a 0 5 M silver nitrate solution Oa 0 5 mol Ob 4 mol Oc 1 0 mol Od 100 mol e l mol

How many moles of gas are present in 42 5 L at STP Oa 1 9 mol O b 53 mol O c 20 1 mol O d 4 25 mol

Given a fixed amount of gas held at constant pressure calculate the volume it would occupy it a 2 00 L sample Q100 L 4 00 L 6220 1 004551

2 points How many moles are in 52 0 grams of methane CH4 3 24 moles 309 moles 16 0 moles 26 0 moles

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What is the number of oxygen atom s on which the negative charge will resonate following relevant resonance structures A B C 0 1 2 D 3 4 F 5 HO H

D Select one Dimensional Analysis 2 Molar Concepts Question 5 How many grams of H O are contained in 3 00 moles of H O O 54 06 grams O 18 01 grams O 6 00 grams O 0 167 grams D E c 1 B e F 219 Key C Section 116 12 5 aliha S d 28 3 11 ht m Ten 2 NO SA n P F S PRO Leld A4 7 FAH DOE P 6 P Br

Select one 1 18 O O O O contain one molecule each contain the same number of molecules have a mass of 1 gram each have the same mass

What changes to the variables below would result in more hydrogen gas H being generated with the reaction H g 12 g Hydrogen lodine AH 9kJ mol Temperature Select Pressure Select 2 HI g Hydrogen iodide Amount of H in reaction vessel Select Amount of HI in the reaction vessel Select Select Increase It does not matter San for

0000000000 the reaction below is at equilibrium what are hree changes a scientist could make to produce s much SO3 as possible Explain how each change will result in more SO3 SO2 g O2 g 2SO3 g AH 197 8kJ mol

Write the equilibrium constant Kp expression for the reaction A g 4B 1 3 C g D g K Answer Bank

Match the description to nuclear fusion fission or both Two nuclei combining Nuclei Separating Used in Atomic Bombs Occurs in the Sun Used in Nuclear Reactors of Powerplants Releases large amounts of energy Involves Protons and Neutrons Choose Choose Fusion Fission Both Choose Choose Choose Choose V Same options for all

Use the reaction below to answer the question PCI5 9 PC 3 g Cl g AH 67kJ mol 2 00000000 If the reaction is at equilibrium and the temperature of the reaction is increased what will happen O The amount of PCI5 will increase O The reaction will shift to the left The amount of PCI3 will decrease O More Cl will form O The amount of Cl2 will decrease

Which is not something which will affect the equilibrium of a reversible reaction Pressure The size of the beaker a reaction is happening in The amount of energy being added to a reaction The amounts of reactants and Products

A person uses 98 21mL of a 1 72M LiOH solution as a titrant to titrate a solution of HBr with an unknown concetration If the volume of of the HBr sample being titrated is 11 6mL what is the concentration molarity of the unknown solution Round to two decimal places

Use each of the terms below just once to complete the passage a immiscible d solution b liquid e miscible Air is a n 1 of oxygen gas dissolved in nitrogen gas and nitrogen is the 3 The oxygen in air is the 2 3 If one liquid is soluble in another liquid such as acetic acid in water the two liquids are 4 However if one liquid is insoluble in another the liquids are 5 The word used to fill in blank 1 is The word used to fill in blank 2 is The word used to fill in blank 3 is The word used to fill in blank 4 is The word used to fill in blank 5 is 1 c solvent f solute Choose the correct letter a f Choose the correct letter a f Choose the correct letter a f Choose the correct letter a f Choose the correct letter a f

A person finds the pH of a solution is 13 What is true about the solution O None of these are true O The solution contains a lot of hydrogen ions O The solution contains a lot of free protons O The solution is acidic

Which of the following substances is a base NaCl O H O HCI OLIOH OHBr

A person fully reacts 57 0g of carbon with excess hydrogen gas How much energy in kilojoules is released by the reaction Use a negative number if energy is released and a positive number if energy is added Round to 2 Decimal Places 4C s 5H g C4H10 g AH 125 6 kJ mol

Why does a titration of an acid with a base used as a titrant result in a neutral solution

A person wants to make 441mL of a 1 1M HCI solution What mass in grams of solid HCI would they need to make this solution

Question 35 What is the oxidation number of Sulfur in Na2S O3 Remember all of the charges of a compound have to equal zero 0 1 4 6 2 Next

What is the concentration M of 39 88 mL of an unknown NaOH solution if it required 46 08 mL of 0 6592 M HCI to neutralize A titration problem Write the reaction out first A 0 7617 B 2788 C 1211 D 1 313 E 1 211

Potential Energy A B C Reaction Coordinate D According to the potential energy diagram above which letter interval represents activation energy B and this PE diagram represents an exothermic reaction B and this PE diagram represents an endothermic reaction C and this PE diagram represents an endothermic reaction

is soluble in water at 25 C A Fe3 PO4 2 B Fe OH 2 C FeS D FeCO3 E Fe C2H3O2 2

What is the balanced net ionic equation when aqueous solutions of Pb NO3 2 and KBr are mixed and form a product Is a precipitate formed A Pb2 aq 2Br aq PbBr2 s B Pb2 aq 2NO3 aq C Pb2 aq 2NO3 aq D Pb NO3 2 aq E Pb NO3 2 aq Pb NO3 2 s Pb NO3 2 aq 2KBr aq PbBr2 s 2KNO3 aq 2KBr aq PbBr2 s 2KNO3 s

Question 31 In the formula X O5 the symbol X could represent an element in Group 1 2 18 O 15

A Sample of OXY Occupies a volum of 350 mL at 300k What volume will it occupy at 360k

Question 25 What is the gram formula mass of Ba OH O 154 3 g O 155 3 g 308 6 g O 171 3 g

SOVE AN The volume of a sample of gas initially at 298 K and 159 mL increases to 456 ml What is the final temperature of the sample of gas if the pressure and amount of gas in the container is kept constant

Question Which answer represents an exothermic reaction g s s 1 s g 1 g

To start we need to calculate the theoretical yields for the following 8 reactions Flask Amount of Amount of Vinegar mL Baking Soda g 1 00 H F G A B C D E 50 50 50 50 50 50 50 50 1 50 2 00 2 50 3 00 3 50 4 00 4 50 Theoretical Yield of CO Limiting Reactant vinegar calculated below or baking soda

Question 17 Given the reaction of an acid and a base to produce salt and water H SO4 Mg OH MgSO4 2H O The type of reaction represented is a neutralization reaction a single replacement reaction a decomposition reaction a combustion reaction

Using the formula M V M V2 Where M molarity concentration and V volume Calculate the volume in milliliters of 0 5M HNO3 needed to neutralize 35 mL of 0 762M NaOH 22 966 mL 0 0109 mL 53 34 mL 13 335 mL

Question 28 Which choice represents a base HCI NaOH CH3COOH HNO3

ucti uestion 30 The element in Period 4 and Group 1 of the Periodic Table wou classified as a semimetal metal Onoble gas nonmetal

8 How much energy will it take to change 50 0 grams of ice at 0 C to water at 0 C Answer 16700 J

Question 15 What could be a pH of a strong acid 07 12 2 05

Determine the mass in grams of CO that are produced by the complete reaction of 10 49 grams of C6H12 cyclohexane according to the following combustion reaction C6H12 1 9 O g 6 CO g 6 H O g

9 Calculate AH for the reaction CH4 g NH3 g HCN g 3 H g given 1 N 8 3 H g 2 NH3 g C s 2 H g CH g H g 2 C s N g 2 HCN g CH g NH3 g HCN g 3H 75 AH 91 8 kJ AH 74 9 kJ AH 270 3 kJ AH