General Questions and Answers

10 3 Write balanced equations for the following neutralization reactions Ba OH 2 HNO3 Bon Jester Al OH 3 H3PO4 Sr OH 2 H3PO4 20

Will stronger intermolecular forces result in a higher viscosity or lower viscosity O higher O lower

If 28 0 grams of Pb NO3 2 react with 18 0 grams of Nal what mass of Pbl2 can be produced Pb NO3 2 Nal Pbl2 NaNO3 O 27 7 g Pbl O 39 0 g Pbl2 O 44 8 g Pbl2 O 56 1 g Pbl2

If 10 0 grams of lithium hydroxide reacts with excess hydrobromic acid how many grams of lithium bromide will be LiOH HBr Li Br H O produced

Multiple choice 1 AGO will always be spontaneous under what set of conditions AH AS AH AS AH AS d AH AS a b 2 Many molecular collisions do not result in chemical reaction W a The colliding molecules are not the reactive chemicals fficient energy 1 11 1

Lesson 1 Use the graph below to determine if the reaction of oxygen with ethanol is exothermic or endothermic potential energy Ethanol Oxygen exothermic because energy is released e fine O exothermic because energy is absorbed endothermic because energy is released O endothermic because energy is absorbed Carbon dioxide steam

Which of the following substances is most likely to have a pH of 10 O lemon juice O drinking water drain cleaner

Select the enantiomer of the following compound CH5 0

Based on general ranking of intermolecular forces what is the strongest intermolecular force between C3H7 and H O O a dispersion O b dipole induced dipole O c H bonding O d dipole dipole

If you test an unknown liquid and the litmus paper turns a shade of blue that tells you that the liquid is which of the following An acid Neutral O A base 1 poin

How many moles of oxygen are needed to produce 4 50 moles of water 2 H O 2 H O

The following data was collected when a reaction was performed experimentally in the laboratory Reaction Data Reactants AI NO3 3 NaCl Starting Amount in Reaction 4 moles 9 moles Products NaNO3 AICI 3 Determine the maximum amount of NaNO3 that was produced during the experiment Explain how you determined this amount

Which of the following is a valid mole ratio from the balanced equation 2Fe O3 3C 4Fe 3CO O 2 mol Fe O3 4 mol Fe O 4 mol C 3 mol Fe O 2 mol Fe O3 4 mol C O 3 mol C 4 mol CO

10 4 What is the formula for calculating the OH from the H3O Whough nonel

If magnesium metal reacts with 5 5 grams of sodium fluoride how many grams of magnesium fluoride will be produced Mg 2 Na F MgF 2Na Fz

The following compounds are dissolved in diethyl ether and then extracted with 0 1 M HCI pH 1 which will be in the aqueous layer CH3 NH NH OH I O I and IV O I II and III O I IV and V I and V II and III II III and IV E IV V OH

0 00 0 01 A C B Find the key to break the code Speed 1x Give up on the mission and go home

Use the dropdown to determine the oxidation state of the cation Ni CO3 2 is called nickel Select Select Question 8 Match each description w III IV VI V carbonate hetry All descriptions are

2 If 45 grams of C2H4 is combusted how many grams of carbon dioxide will be produced Cz Hy 30 2 CO 2H O 2

Carbon dioxide can be created by burning carbon in oxygen C 0 CO Approximately how many moles of carbon dioxide can be created from 24 0 g C and excess O O 12 0 mol O 44 0 mol O 2 00 mol O 0 200 mol O 0 500 mol O 22 0 mol O 24 0 mol

8 3 5 2 Select lanced th unh of mass states that matter cannot be created nor Select Li Select N Select Li3N in a chemical reaction

The law of Select of mass states that matter cannot be created nor Select Select energized transformed in a chemical reaction

Find the change in enthalpy AH for the reaction below Round your answer to the nearest 0 1 and include proper units XaZA QCB8 aq XaBg aq Q Z10 The following information is available XaZQ aq XaZQ s XaZQaq QB8 aq XaBg aq Q Z AH 19 3 kJ AH 19 9 kJ

The concentration of hydronium ions and hydroxide ions can vary widely in a solution easily from 1 M to 1 x 10 14 M This variation is too wide to fit on an analog readout In order to make this into a smaller scale suitable for an analog readout the log to the base 10 was used so that the read out is focused on powers of 10 Note that the log 1 0 and the log of 1 x 10 14 14 It was then decided that the numbers should be positive so the sign was changed The way to measure concentrations of both H and OH was thus defined as log This was then referred to as p Thus pH log H pOH log OH and pK log Kegl You need to figure out how to do this mathematical manipulation on your calculator The acid base reaction in pure water is H O H O H 0 OH and it was found that in pure water under standard conditions the H30 OH 1 x 107 M Neutral pH is defined as having a H or H30 of 1 x 107 M The pH of a neutral solution is thus pH log 1 x 107 The pOH of a neutral solution is thus pOH log 1 x 107 a 7 b 6 C 8 27

IS Watch IWE 16 7 Read Section 16 4 You can click on ink to access the section in your e Text reaction method to balance each redox reaction occurring Jeous solution Part B CIO3 aq SO g Cl aq SO aq Express your answer as a chemical equation Identify all of the phases in your answer CIO3 aq 3SO2 g 3H O 1 Cl aq 3SO aq 6H g Submit Part C Previous Answers All attempts used correct answer withheld by instructor After following the half reaction method you obtain the equation CIO3 aq 3SO2 g 3H O 1 Cl aq 6H aq 3SO aq NO aq Cr O7 aq Cr aq NO aq Express your answer as a chemical equation Identify all of the phases in your answer Submit A O aq 2NO g 2H O l 1 s S C 0 29 3NO 29 8H 29 2C g 3N0 2 41 0 A chemical reaction does not occur for this question Previous Answers Request Answer

A student Sam is helping a friend Devin solve a stoichiometry problem Devin needs to know how many liters of nitrogen monoxide NO gas are created at STP when 32 2 g of solid copper reacts with excess nitric acid 3Cu s 8HNO3 aq 3Cu NO3 2 aq 4H O 1 2NO g Devin knows they should put 32 2 g Cu down first and they also know they need to convert from grams to something else Sam provides a clue to Devin they will need 3 conversion factors which are empty below What does Devin need in order to complete the first conversion factor Below is what Devin has so far 32 2 g Cu X O The molar mass of nitrogen monoxide O The STP volume of gas 22 4 L mol Avogadro s number O The molar mass of copper O Coefficients from the balanced equation molar ratio

5 Write the empirical formula for each of the following compounds P4010 a b C12H22011 C H O

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Radiation intensity is expressed in different ways depending on how it is being measured Mechanical measurements use becquerels Bq or curies Ci Energy absorbed by tissue is expressed in grays Gy or rads rad Tissue damage is expressed in sieverts Sv or rem These units are related as follows 1 Bq 1 disintegration s dps 1 Ci 3 7 x 10 0 Bq 1 rad 0 01 Gy 1 Gy 1J kg tissue 1 rem 0 01 Sv 1 Sv 1J kg Part A If you purchased 1 01 Ci of sulfur 35 how many disintegrations per second does the sample undergo when it is brand new Express your answer numerically in disintegrations per second View Available Hint s VAX Submit Part B dps

3 What chemicals do you breathe in through your nose and breathe out through your mouth

2NaN3 s 3 N g 2Na s The equation above is part of the reaction that occurs when an airbag inflates during a collision The bag fills with nitrogen due to the decomposition of sodium azide If an airbag fills with 3 75 mol of nitrogen gas 1 how many moles of sodium azide decomposed Answer Select 2 what mass of pure sodium is also created Answer Select V Select Select

18 which one of the following catalysts is not a reforming catalyst Pt Ir Al O3 PH Al2 03 PJ Ah O Pt Re Al2O3 19 which one of the following supports may react with strong acids Cab o sil Al O3 ca activated carbon Flamed silica

The percent yield of this reaction is 77 0 2Al s 3 F g 2AIF3 s Determine the mass in grams of the actual experimental yield of the product if excess fluorine gas reacts with 134 0 g of aluminum Answer g round to nearest whole number

Consider the reaction 3X 2Y 5C 4D How many moles of C can be synthesized from 31 0 moles of Y and excess X

Up late a tired engineer calculated the molar mass of nitroglycerin C H5N30 to be 197 g mol but this in correct What is the percent error of this incorrect molar mass Answer 6 Round to the nearest tenth three sig figs

NH Cr O s Cr O3 s N 9 4H O g 1 What is the theoretical yield of water produced Select Select 2 Determine the percent yield for water I Select Question 20 57 8 g 23 2 g 334 7 g 81 2 g

15 Complete and balance the neutralization reaction and use it to answer 16 17 Sulfuric acid reacts with potassium hydroxide to produce Equation 16 What is the molarity of H SO4 if 125 mL is needed to neutralize 65 0 mL of 0 25 M KOH 17 What is the molarity of KOH if 50 0 mL is needed to neutralize 100 mL of 3 0 M H SO4 18 Complete and balance the neutralization reaction and use it to answer 19 20 Phosphoric acid reacts with barium hydroxide to produce Equation 19 What is the molarity of H3PO4 if 75 0 mL is needed to neutralize 60 0 mL of 0 60 M Ba OH 2 20 What is the molarity of Ba OH 2 if 15 0 mL is needed to neutralize 10 0 mL of 1 5 M H3PO4

How many fluoride atoms are in the formula unit for copper II fluorid

The substance being reduced is the oxidizing agent while the substance being oxidized is the reducing agent True False

Certain mole of charcoal 12C has to be completely converted to CO2 after reaction with the oxygen of air If double amount of air mole basis was supplied in the reactor then find the average molecular weight of the outlet gas mixture stream Note that carbon has no reaction with nitrogen in this case

When 1 390 grams of benzoic acid C6H5COOH is burned in a new bomb calorimeter the temperature increases from 26 41 C to 34 73 C If the burning of benzoic acid has a AH of 3 227kJ mol what is the heat capacity of the new calorimeter in J C

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 Tp2 X03Lb4 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 Tp Xo Lb Molar Mass of Compound

4 Using the periodic table determine the formula of the magnesium nitride byproduct formed in the combustion of air If this were not treated with water to convert it to magnesium ox ide how would the final results have been affected

PC15 s H O l POC13 1 2HCl aq When 58 75 g of phosphorus pentachloride reacts with excess water what mass of hydrogen chloride will be produced If needed enter scientific notation with the e For example 1 44 107 would be entere as 1 44e7 Answer HCL

Calculate the formula for the calcium hydroxide by using the molar mass and exact sample mass of calcium to determine the number of moles used in your titration Next calculate the moles of HCl that was used to titrate each sample Use this information to calculate the mole ratio between HCl and Ca for each sample Remember from Equation 4 4 that one mole of HCl reacts with one mole of hydroxide therefore how many moles of hydroxide must have been produced for every mole of calcium that reacted From your experimental result what must be the formula for the calcium hydroxide produced in the reaction of calcium with water Remember that the point is to find the experimental formula for the calcium hydroxide Your calculations must be done as if you don t know the actual formula

Determining the structure of benzene an important organic compound proved to be a difficult challenge for chemists in the 19th century A sample of benzene was analyzed and found to consist of 1 43 g of carbon and 0 119 g of hydrogen Given that the molar mass of benzene is 78 0 g determine both the empirical and molecular formulas for benzene

e 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 determine the molar mass of the compound Fp3 Gr2 2Tr5 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 Mass of All Atoms g mol Element Total of Atoms Fp Gr Tr Molar Mass of Compound

A sample of an unknown compound was analyzed and found to contain 0 642 g of Su 0 32 g of oxygen and 1 42 g of chlorine Determine the empirical formula of the compo

1 53 17 54 0 85 17 89 29 68 0 25 28 99 0 26 0 45 0 64 1 92 1 92 6 0 5 5 ppm 5 0 4 5 4 0 0 5 7 5 7 0 6 5 3 5 3 0 2 5 2 0 1 5 1 0 0 0 ut 7 52 7 51 7 47 7 45 7 43 7 00 6 98 6 96 6 94 6 86 3 90 2 60 2 58 0 01 0 01 JENNA 04 22 2022 17 54 17 89 29 68 28 99 7 8 ppm ppm 7 0 6 9 ppm 3 9 ppm 2 60 7 82 7 92 7 73 7 52 7 51 7 47 7 45 7 43 7 00 6 98 6 96 6 94 6 86 3 90 2 60 2 58

Use the dropdowns to create the proper name for the compound SeS is called Select Question 6 Match each mo linear trigonal planar Select monoselenium monosilicon monosilver silicon sodium selenium monosodium Select oximate bond angle Choose