General Questions and Answers

How many moles of Zn NO3 2 are produced from 49 20 grams of AgNO3 and excess Zn Round your answer to three digits after the decimal point Zn 2 AgNO3 2 Ag Zn NO3 2 Your Answer Answer

A researcher is using 2 63 x 1023 molecules of chlorine gas Cl in an experiment How many grams of chlorine is the researcher using Remember to include units abbreviated appropriately and the substance in your answer Round your answer to the nearest 0 01 Your Answer

A solution containing 1 252 g of an unknown molecular compound dissolved in 99 04 g of benzene is found to have a boiling point of 80 31 C Data for boiling point K C m freezing point K C m benzene CH 80 10 C 2 53 5 5 C 5 12 Type numbers in the boxes 10 points Use this data and the appropriate values in the table above to determine the molar mass of the unknown compound g mol

Concentration M OH 4 pH 7 6 pH 10 pH Choose the molecule that is most concentrated at each pH 2 CO3 co 8 CO3 10 H CO3 H CO3 H CO3 H CO3 HCO3 CO3 HCO3 HCO3 HCO3 Ocean Carbon Cycle Solubility Reaction Rates Le Chatelier s Principle pH and Equilibrium Review

What is the pH of a solution with H 7 0 10 12 OA 11 15 OB 12 85 O C 12 00 OD 11 15

Enter your answer in the provided box Using the balanced equation for fermentation answer the following question C6H12O6 aq 2 C H6O aq 2 CO g glucose ethanol How many grams of CO are formed from 0 20 mol of glucose g CO

Be sure to answer all parts Write ionic and net ionic equations for the following reactions Be sure to include the states for each species a Na S aq ZnCl aq Total ionic Net ionic b Mg NO3 aq 2 NaOH aq Total ionic Net ionic 1

6 0 17 moles of hydrogen gas and 0 33 moles of nitrogen gas are created from the eaction 2NH g 3H g N g The final total pressure in the reaction vessel is 75 atm Calculate the partial pressure of the hydrogen gas at the end of the reaction ssume the number of moles of NH3 g left after the reaction occurs is negligible a 0 26 atm b 0 13 atm c 0 5 atm d 0 75 atm

7 Balance the following equation C H4O 0 CO H C

How many grams of solute are contained in each solution a 270 mL of a 0 46 M NaNO3 solution b 71 mL of a 4 1 M HNO3 solution c 1 5 L of a 3 7 M HCl solution g NaNO3 g HNO3 g HCI

5 What is the volume in liters of 8 34 moles of hydrogen gas at STP

How will the equilibrium change if the ocean is more acidic More HCO3 is made More CO3 is made

9 10 points The concentration of hydrogen peroxide H O2 in a solution is determined by titrating a 10 0 mL sample of the H O2 solution with permanganate ion MnO4 according to the equation below 2MnO4 aq 5H O2 aq 6H aq 502 g 2Mn aq 8H O 1 If it requires 15 2 mL of 0 103 M of MnO solution to reach the end point what is the molarity of the hydrogen peroxide H O2 solution

When 9 8 g of aluminum oxide decomposes how many g of aluminum metal are produced 2 Al2O3 HAI 30 HA 4 89 A1 03 1MP3 4 mol All MATT 101 9592 mol 9 A1203 A1203

Experiment 4 Does Lead reduce Zinc Reactants 1 g Pb s 150 mL Zn aq Reactants Mass of solids Zn2 Pb s Products Zn Pb s aq aq Zn s 1 g Mass of solids 1g 5 22018e 25 g Explain the results Molarity of metal aq 0 1 M Molarity of metal ag 0 1 M I Observations Clear Liquid Observations Clear

Be sure to answer all parts How many molecules of butane C4H10 are contained in 7 70 105 mol The answer should i provided in scientific notation x 10 select molecules

1 What does molarity mean Li NO3 2 What is the molarity of a solution that contains 4 53 moles of lithium nitrate in 2 85 liters of solution 03 F3 3 A beaker contains 214 2 grams osmium III fluoride in 0 0673 liters of solution What is the molarity

Jrea process plant UFFL 01 jpg 2020 September 25 Wikimedia Commons the free media repository Retrieved May 3 2021 process plant UFFL 01 jpg oldid 470991524 from https commons wikimedia org w index php title File Urea At the factory a new engineer combines of 1500 L of carbon dioxide and 1500 g of ammonia NH3 His goal was to have no excess reagent left over To his surprise he miscalculated One of the reagents ran out first Help him determine which one ran out first and also calculate the amount of urea produced 1 Convert both initial reactant values into moles 2 pts 2 Which reagent is the limiting reagent 2 pts 3 What mass of urea CO NHal is produced Urea has a molar mass of 60 1 g mol 2 ptr

Points 2 Question 13 When Paine talks about monarchy and hereditary succession in his essay Common Sense what point does he make Kings are the means of happiness to mankind How such a race came into the world should be enquired of Distinction of men into kings and subject has a religious reason

Be sure to answer all parts Calculate the formula weight and molar mass of the following biologically active compound C16H16CINO S Plavix a drug used to treat coronary artery disease amu g mol

understanding the way that our world works One area where this is particularly important is in the realm of where we get the energy to power our world daily These energy sources come from coal wind solar tidal nuclear and many more Our focus will be on nuclear energy especially since the United States is the largest producer of nuclear energy in the world After watching the TED Talk in class and reading through the Pro Con List for Nuclear Energy we want you to start to form an opinion on if Nuclear Energy should be an energy source worth pursuing either as a primary energy source a secondary energy source or to not pursue at all Assignment Parameters This assignment must be typed preferred and needs to be a minimum of 4 paragraphs 5 8 sentences each paragraph Add as much as you need to cover the items listed below You need to find information from two 2 additional sources beyond what we used covered in class

1 008 2 A A compound has the percent composition 47 40 Pd 28 50 O 21 40 C and 2 69 H Based on this information which molecular formula could represent the compound PdO C H3 Pd 0 CCH3 2 Pd 0 C H3 3 PdO4C Hg n Pd C8H1208

5 Find the number of moles of H O produced when 2 65 moles of NH3 is consumed according to the following equation 4 NH3 5 0 4 NO 6 H 0

Which of the following pairs of compounds form a solution a KCI and CC14 select b 1 propanol C3HgO and H O select c cyclodecanone C10H1sO and H O select d pentane C H12 and hexane C6H14 select

Be sure to answer all parts What is the molar mass of each ionic compound a CuSO4 a common copper supplement g mol b KI the essential nutrient added to NaCl to make iodized salt g mol

Enter your answer in the provided box Use the balanced equation for the conversion of salicylic acid and acetic acid to aspirin to answ following questions C H5O3 s C H O 1 C HgO s H O 0 salicylic acid acetic acid aspirin How many grams of acetic acid are needed to react with 88 1 g of salicylic acid C H O

Click in the answer box to activate the palette Enter a net ionic equation for the reaction of Mg s with CuSO4 aq

following excuse for being late to school My dog drank up my alarm clock According to the article which type of clock is this student most likely using OA sandglass O A calibrated candle O A clepsydra OA shadow clock

1 How many moles are in 92 3 grams of Mg CN 2

1 Na is smaller than Na atom 2 S2 is smaller than S atom 3 Bonding radius is larger than nonbonding radius 4 Second ionization energy is larger than the first ionization energy 5 The mean free path for air molecules at sea level is longer than at the top of the mountain 6 A polar liquid is soluble in a non polar liquid 7 According to kinetic molecular theory of gases at constant temperature the average kinetic energy of molecules changes 8 The melting and freezing temperature of water is same

Our stomach juice is very acidic because relatively high concentration acid is needed to digest food True False Question 8 The following are all strong bases LIOH NaOH KOH Cu OH 2 Al OH 3 O True

11 The energy required to separate 1 mole of a solid ionic compound into its gaseous ions is called a ionization potential electron affinity 14 c electronegativity energy 12 In the molecule below which atom has the largest partial negative charge Element Electronegativity Cl I F C Br I I a F c Br 13 Given the electronegativities below which covalent bond is most polar pressure b Cl d I HCN 0 2 1 2 5 3 0 H Resistance of a liquid to flow is called a C H c N H a surface tension C viscosity b d lattice 3 5 b O N d O b vapor d capillary

5 A sample of a gas 3 0 mol at 6 0 atmosphere is expanded at constant temperature from 10 L to 15 L The final pressure is 5 Marks a 4 b 8 c 3 d none of these 7 A sample of gas originally at 20 C and 2 0 atm pressure in 2 5 L container is subject to a pressure of 1 0 atm and a temperature of 15 C The final volume of the gas is b 4 9 L a 2 9 L Marks c 6 0 L d none of these 3 A cylinder whose volume is 150 cm and contains 64 gm of O gas What is the pressure inside the cylinder at 20 2 C 5 Marks a 100 atm c 150 atm 5 b 321atm d none of these

in portrait mode and has your name on it and submit it by selecting the Part B test heading above You will only be allowed one submission Problem 1 It is estimated that the volume of water contained in the all the oceans on earth is 3 21 x 108 cubic miles How many megaliters would this be if 1 cubic mile 4 17 x 1012 liters Problem 2 A 38 lb child is prescribed acyclovir for chicken pox in an amount of 80 mg kg body weight per day to be divided in four doses Each tablet contains 700 mg of the medicine How many tablets shoud be given per day Per dose Problem 3 A turkey and cheese sandwich is found to contain 15 grams of fat 33 grams of carbohydrate and 21 grams of protein Calculate the percent fat carbohydrates and protein for this sandwich Do not have to use dimensional analysis Problem 4 What mass of magnesium nitrate Mg NO3 2 would contain 0 345 moles

reaction type Double 2 HCI NaOH H O NaCl 4 AgNO3 NaCl NaNO3 AgCl 6 2Ag S Ag S 8 Cl 2KBr 2KCl Br Classify the following chemical reactions 1 C H 60 4CO 4H O 3 2KNO3 s 2KNO2 s O2 g 5 2Mg O 2MgO 7 MgCO3 s MgO s CO2 g 47 In the following examples identify the solute and the solvent a Sugar dissolved in water solute b Salt dissolved in water solute c Carbon dioxide in soda solute solvent solvent solvent 11 10 Replacement

concave mirror has a 20 cm radius of curvature Find the image of an bject located 15 cm from the mirror Draw a ray diagram nt of the alismi edt brila d

I point What happened in the 4 00 g Na trial What possible reason explains why only 6 50 g of sodium chloride were produced Na g Cl g Reaction Data Mass Na g Mass NaCl g 1 2 2 5 4 2 5 5 6 5 6 5 there was too much sodium chlorine was the limiting reactant sodium was the limiting reactant there was too much chlorine

At 570 mmHg and 25 C a gas sample has a volume of 2270 mL What is the final pressure in mmHg at a volume of 1250 mL and a temperature of 175 C 1560 mmHg 210 mmHg 7000 mmHg 690 mmHg 470 mmHg

How many moles of KOH are there in 42 1 grams of KOH

What is the IUPAC name for a eight carbon continuous chain alkane hexane heptane octane nonane

What is the concentration in mass percent m m of a solution prepared from 50 0 g NaCl and 150 0 g of water

You can taste basic or acidic chemical substances in laboratory O True O False Question 7 Our stomach juice is very acidic because relatively high concentration acid is needed to digest food True

1 point You are a chemical engineer as a manufacturing plant One day the air conditioning breaks and the air inside the plant becomes very humid The percent yield for your products drops significantly that day What could be the possible cause for the drop in percent yield the excess water vapor in the air is creating an unintended side reaction the drop in percent yield is due to slower electrical currents in the plan machines due to the humidity the excess carbon dioxide in the air is creating an unintended side reaction DAU

D What happens when we dissolve HCI in water Ono ions form It releases OH ions OIt is ionized into H and Cl O only a few ions will form Question 10 The name of H3O is Hydrogen hydroxide O Hydrowater Hydroxide ion

What is the theoretical pH of a 0 00001 M HC H5O solution 07 09 0 5 03 0 12 05 0 3 O The pH can not be determined

3 points The combustion of ethene is shown by the following chemical equation C H4 g 302 g 2 CO g 2 H O g If 2 70 mol of C H4 reacts with 6 30 mol O ROUND calculation answers to 2 decimal places 1 How many moles of oxygen is required to react 2 70 mol C H4 2 Which is the limiting reactant 3 Calculate the moles of water produced To react 2 70 mol of ethene you need type your answer type your answer mol of water will be produced mol of oxygen choose your answer V is the limiting reactant A

What is the theoretical pH of a 0 0001 M LiOH solution 012 can not be determined 02 O 0 0001 0 4

2 points A chemist was mixing varying amounts of sodium metal with a fixed mass of chlorine gas The following graph shows the masses of sodium used with the amount sodium chloride produced Identify the limiting and excess reagents 7 Mass of NaCl g 6 5 1 09 1 2 3 Mass of Na g 4 The limiting reagent is choose your answer sodium chloride sodium chlorine V and the excess reagent is Answer

Acids are compounds that release H into aqueous solutions O True False Question 2 Acidic food tastes sour True

Tin II chloride reacts with oxygen gas to produce tin II oxide and chlorine dioxide If 0 750 moles of oxygen were consumed using this chemical reaction what mass of tin II oxide would be produced Balanced Equation Before Change After Reactant 1 Reactant 2 Product 1 Product 2