General Questions and Answers

Calculate the mass of 5 3 moles of chloric acid HCIO3 Explain the process or show your work by including all values used to determine the answer

2 Review How much water mL would be produced by melting 3500 m 3 of ice 1 Point O3 360 mL 7 000 mL 1 750 mL 3 645 mL

1311 has a half life of 8 04 days Assuming you start with a 3 53 mg sample of 1311 how many mg will remain after 13 0 days Show your work

According to Henry s law what is the molarity M of N in water when the partial pressure of N gas above water is 5 00 atm KH 6 40 10 4 M atm for N

Write the chemical equation for the formation of HBr from the single isolated H and Br atoms equation Using the table of bond energies determine AH for the reaction Think about the sign of the energy value in this reaction AH Bond H H H F H C H Br H I Bond dissociation energies Energy kJ mol 436 569 410 366 298 kJ mol

Directions Complete the following reactions that are happening in to tell the states of matter for all compounds involved If the reaction is not possible state that 3 2 HCI 2 Na 4 I Pb NO3 2 2 KOH 5 2 A1 NO3 3 3 Zn 6 2NaOH 1 K S LICILO NaCl 2 NaCl H 2KNO Pb OH 2A1 32m NO 2KOH Na S

A 2 50 L vessel contains 15 75 g of a gas at 5 00 atm and 37 0 C What is the molar mass of the gas

What is the outcome of the following argument Premise 1 Boys love to eat cereals Premise 2 Jayden loves to eat cereals Conclusion Jayden is a boy O Valid and sound O Invalid O Invalid and sound

Draw the starting monomeric structure that would lead to this addition polymer Select to Draw BuLi

3 Hydropat 3 0 O 130 50 0 3 100 130 Hydrophobic Hydrophilic 50 Residue number How many transmembrane helices does this protein have O None 100 130 estion will save this response

the surroundi shown in Figure 5 12 The metal and water come to the same temperature at 24 6 C How much heat did the metal 22 A 70 0 g piece of metal at 80 0 C is placed in 100 g of water at 22 0 C contained in a calorimeter like that give up to the water What is the specific heat of the metal J g C

6 Write the molecular equation and then net ionic equation for the reaction of sodium carbonate and hydrochloric acid in aqueous solution

1 Write the reaction for H S dissolving into water 2 Write the expression for the Ka Ka a acetic g sulfurous n HPO3 u H O aa 2 6990 88 5 000 x 10 12 mm conjugate acid b hydrochloric h hydrosulfuric 0 H PO3 p CO3 W 0 02500 v 0 1000 bb 1 000 x 10 1 hh 11 3010 00 base c phosphoric i OH C d perchloric J H30 k SO4 q HCO3 r H S x 1 000 x 10 3 CC 11 0000 ii 0 01250 pp conjugate base dd 2 jj 0 22100 e hydrofluoric 1 Mg2 S HS 1 y 3 0000 t 5 z 1x 10 14 ff 2 000 x 103 kk 0 05656 II acid ee 1 f sulfuric m cr

Which of the following are the conditions known as standard temperature and pressure STP 0 C and 1 00 atm 0 C and 100 atm O100 C and 1 00 atm 25 C and 10 0 atm

Given the reaction N g 3 H g 2 NH3 g If the system is at equilibrium what will happen is pressure is added O Nothing Pressure does not affect equilibrium position The reaction will shift to the right to produce more product O All of the above The reaction will shift to the left to produce more reactants

04 O where appropriate spoguts are really pre of his as fontos sno nbe iseq ui 0 u xo so n barem dinheir jo fortepixo a los contra la parte a fi

Given the reaction A B C D The concentrations at equilibrium are A 1 M B 1 M C 2 M and D 2 M What is the value of the equilibrium constant K O 4 0 1 0 O 2 0 O 0 25

An equilibrium constant of 900 indicates O There are more reactants than products at equilibrium The reaction is not at equilibrium There are the same amount of reactants and products at equilibrium O There are more products than reactants at equilibrium

The standard concentration of nitroglycerin is 25 mg 250 ml A patient receives 300 mcg min as an IV infusion How many ml of the nitroglycerin solution has the patien received in 1 5 hours

Analysis 5 pts each 35 pts total 1 If an object has a high specific heat would it be more like a conductor or an insulator Explain 2 If an object has a low specific heat would it be more like a conductor or an insulator Explain 3 Would you want to use a material with a high or low specific heat to make a lunch box that will keep food cold until lunchtime Explain your reasoning 4 Would you want to use a material with a high or low specific heat to make a pan to cook food quickly Justify your answer

Current Attempt in Progress A mixture of N2 O2 and CO2 has a total pressure of 739 torr In this mixture the partial pressure of N is 11 8 cm Hg and the partial pressure of O2 is 3 60 dm Hg What is the partial pressure of the CO in torr Pco2 i torr

What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100 g of the substance increases in temperature from 10 C to 70 C 32 67 g of water is heated from 4 0 C until its temperature is 37 C If the specific heat of water is 4 18 J g C calculate the amount of heat energy needed to cause this rise in temperature

1 Propane C3H8 is burned in the presence of oxygen Write the balanced equation 2 C3Hs 302 3CO 2H8 a What volume of water vapor measured at 250 C and 1 00 atm is produced when 3 0 L of propane at STP is burned PV nRT RT RT 2C3Hs 302 3CO 2H8 B 0699 XS O O C 0699 2 1049 1049 0699 a P 1 v 3 n X R 0821 T 523 n 1 3 0821 523 n 3 42 94

Answer the following questions using the reaction of ammonia with oxygen 4NH3 g 50 g 4 NO g 6 H O 1 a With 6 moles of ammonia and excess oxygen how many moles of water are produced 2marks b Given 10 moles of ammonia and 14 moles of oxygen how many moles of excess reactant would remain after the reaction was complete 3 marks c If 1 35g of oxygen gas were reacted in sufficient ammonia what mass of nitrogen monoxide would be produced 3 marks

The reactants shown on the left represent iron oxide Fe2O3 and carbon monoxide CO Which of the following is the chemical equation depicted A Fe302 3 CO 3 Fe 2 CO B C Fe302 3 CO 2 Fe 3 CO Fe2O3 3 CO 3 Fe 2 CO2 Fe2O3 3 CO 2 Fe 3 CO Key oxygen carbon iron

A 1 628g sample of a hydrate of Magnesium iodide Mgl xH2O was heated strongly for five minutes The mass of the anhydrous left had a mass of 0 712g It was then heated for al further 3 minutes and the mass remained at 0 712g a Find the mass of water driven off 1 mark b Find the moles of anhydrous magnesium iodide and moles of water 3 marks c Find the name and formula of the hydrate 2 marks d Why was the compound heated twice 1

Question 24 AH Product 4 BE fet reversible E B C D slow A 25 24 26 Livr None of these bstance E in the mechanism is a termediate Rxn Coordinate Time

A 15 9 L sample of neon at 25 0 C and a pressure of 774 torr is kept at 25 0 C as it is allowed to expand to a final volume of 20 3 L What is its final pressure i torr torr

2 why dont you need to add zinc if you see red after adding nitrate reagents Aand B

3 a What are the characteristics of a chelating agent

expression for the following a BaSO4 Ba2 SO42 b NH3 H2O NH4 OH c 2H2O H3O OH

for the following a H2O b NH3 c CH3COOH d CH3 OH

Choose the substance with the greatest surface tension O C6H14 O C12H26 O C20H42

SCH3U In Class Assignment What s in the Vial Use the unit cancellation method Show all your work Use correct number of S D or number of decimal places Part B Molecular Compounds Name of compound 6 Calculate the mass of the sample present in the vial 1 mark Item empty vial vial sample sample AND 0 1500 O ON OH 7 Calculate the amount of the sample present in your vial in moles 2 marks STABLE NET ZERO empty vial 10 2 Max 1500g Name g ded lg B Mass g Formula of compound 1 mark Molar Mass Calculation 1 mark

Refer to graph below to determine whether each of the given amounts of solid will completely dissolve in the given amount of water at the indicated temperature A BU C Solubility g solute in 100 g H O 100 8 22 8 8 3 3 2 90 O Conly 90 B and C 60 50 B and C A and C 40 30 20 10 NaNO CaCl NaCl Pb NO3 SONX 30 0 g KClO3 in 85 0 g of water at 35 C 32 0 g KCl in 70 0 g of water at 82 C 65 0 g NaNO3 in 125 g of water at 15 C KCI KCIO K Cr O7 10 20 30 40 50 60 70 80 90 100 Temperature C

Consider this graph Free Energy Reactants Progress of Reaction Products Choose all options that apply to the above graph Gibb s Free Energy is decreasing This graph shows a reaction that would be spontaneous at this temperatur This graph shows an endergonic reaction

Choose the packing scheme that gives the highest density of spheres O Simple cubic packing O Hexagonal close packing O Four square packing O Body centered cubic packing

a Choose Lewis structure of SeF6 F F F T T Se Submit F Se LL F F F F LL Se F F T Se F T1

Given that AH AE PAV under what conditions would the difference in the values for AH and AE be the greatest When the process involves only solids O The process involves only liquids O When the process involves no change in the amount of gas O When the process involves a change in the amount of gas

What must be true about the work associated with a system in which the internal energy change is 200 kJ as 180kJ of heat is lost to the surroundings O 380 kJ of work is done on the surroundings 220 kJ of work is done on the surroundings O 20 kJ of work is added to the system O 20 kJ of work is done on the surroundings

A mixture of argon and neon has a measured gas density of 1 329 g L at STP Assuming ideal gas behavior what is the average molar mass of the mixture average molar mass of the mixture g mol

Question 9 What is the molarity of a solution made by dissolving 3 090 moles of NaCl in 1500 mL of solution O2 1 M NaCl O9 673 M NaCl O 4 85 M NaCl O4 64 M NaCl

Mrs Allison is being treated with olanzapine Zyprexa 7 5 mg daily orally for her schizophrenia The pharmacy dispenses Zyprexa 2 5 mg tablets How many tablets do you give Mrs Allison daily Report answers with appropriate decimal places for professionals to dispense

Write the first product How many Lithium atoms are on the product side What is coefficient for lithium chloride Type of reaction 39 Find the density of the following objects showing your work Mass Volume Density 5 ml Object Large cylinder 28 g Small cylinder 15 g Small cube Na K Ca C N Mg S Mg Al 27 g Al Ca 40 Which two samples of the three types of items above do you think is made of the same material Why 41 What is the difference between an ionic compound and a covalent compound 42 What is a valence electron 43 What is an oxidation number 44 What is the difference between a cation and an anion 45 Fill in the missing information Ionic Covalent 1st element w charge if ionic CH S CI O O 3 ml 0 O P O 6 cm3 2nd element Chemical formula Chemical Name w charge if ionic CI O NaCl How many carbons on the reactant side How many hydrogens on the product side What is the coefficient for carbon dioxide Type of reaction N O5 CC14 DO Sodium Chloride Carbon dioxide Magnesium oxide Sulfur trioxide in16 Oxygen triflouride

MISSED THIS Watch KCV 11 4 IWE 11 4 Read Section 11 6 You can click on the Review link to access the section in your e Text A bag of potato chips contains 595 mL of air at 25 0 C and a pressure of 765 mmHg Part A Assuming the bag does not break what will be its volume at the top of a mountain where the pressure is 433 mmHg and the temperature is 7 0 C V VAE mL

1 What does the loan qualifying process NOT include O a credit b capacity to repay c capital d commission

Balance the equation for a half reaction that occurs in acidic solution Use e as the symbol for an electron equation S 0 HSO A

8 Kinatics a If a tree dies and the trunk remains undisturbed for 13847 years what percentage of 14 original C is still present half life of C 5730 years Show your work a 81 3 b 18 7 c 37 5 d 28 1

STP standard temperature and pressure is used as a reference point for the molar volume of an ideal gas In the USA most chemists most general chemistry texts and OWL use STP 0 C 1 atm where the molar volume 22 4 L mol If the reference pressure is chosen to be 1 bar the molar volume is 22 7 L mol Do not confuse the two A 0 80 mol sample of xenon gas occupies a volume of Visited L at STP

of the statements related to chemical ction rates are A Chemical reaction rates are most commonly described in terms of changes in concentration over time B Chemical reaction rates are most commonly described in terms of changes in temperature over time C During a chemical reaction reactant concentrations increase with time because reactants are consumed D During a chemical reaction reactant concentrations decrease with time because reactants are consumed E Product concentrations increase with time because products are formed F Product concentrations decrease with time because products are formed A In order to form new reaction products reacting particles must have enough kinetic energy and collide with one another at the right orientation Which of the reaction collisions results in the formation of new reaction products A Collision 1 B Collision 2 C Collision 3 D Both collisions 1 2 Collision 1 Collision 2 Collision 3