General Questions and Answers

The hydronium ion concentration in an aqueous solution at 25 C is 1 3x10 2 M The hydroxide ion concentration is The pH of this solution is M

A student weighs out a 7 66 g sample of Cul transfers it to a 125 mL volumetric flask adds enough water to dissolve it and then adds water to th 125 ml tick mark What is the molarity of copper II iodide in the resulting solution Molarity M

5 Methanol CH OH can be produced through the reaction of CO and H in the presence of a catalyst If 75 0 g of CO is used and the typical yield is 79 8 what mass of methanol is likely to be produced

Post Lab Questions Show all your work Use proper units and significant figures 1 A solution weighs 44 g This sample contains 12 g of salt Calculate m m salt

Classify each of the following changes as chemical or physical ripening of bananas sweetening coffee with

What amino acid sequence is encoded by the codon sequence UUAGCCUUUAGCGGA Use the 3 letter amino acid abbreviations with hyphens and no spaces in between i e Ser Asn Tyr Leu Pro

many grams of AgCl are produced if 53 6 g of Ni NO 2 are also produced AgNO3 NICI AgCl Ni NO3 2

6 Write out the complete electron configuration notations for the following a O b 0 c As d Mg Which one of the two isoelectronic ions in question 6 above has the smallest radius 7 8 Use principles of atomic structure and the information in the table below to answer each of the following K Ca Ionization Energy kJ mol First 419 590 Second 3 050 1 140 a Explain the difference between Ca and K in regard to i their first ionization energies ii their second ionization energies b The first ionization energy of nitrogen is 1402 kJ mol and that of oxygen is 1314 kJ mol Account for this difference Hint write out the orbital notations for each element

8 82 Calculate the pH of a solution that has OH 6 7 x 10 M

each equation and then find the ending point s Be sure to list your equalities and utilize a IONS Please answer each of the following problems using unit analysis First balance grid Please include proper units and circle your final answers Please provide your answers in scientific notation and the correct number of significant figures TOICHIOMETRY 1 How many moles of Ag S could be produced by 4 90 mol of Ag Ag s H S g Ag S s H2 g PER FORM A

Oprotein complexes carry lipids in the bloodstream Which of the following lipoproteins carries cholesterol at least 25 cholesterol by weight elect all that apply Ochylomicrons Overy low density lipoprotein Ohigh density lipoprotein

Question 13 When salt dissolves in water the resulting intermolecular force between the salt and the water molecules is a n A B hydrogen bond D ion dipole C dipole dipole ion ion

ecide if each of the following molecules is chiral or achiral CH3 CH CHCH OCH3 CH CH3 CH CH CHCH OH SH CH CH CHCH3 CH3 CH3 CH3CCH CH3 CH3

5 The longest wavelength of light with enough energy to break the Br Br bond in Br g is 629 nm a Calculate the frequency in s of the light b Calculate the energy in Joules of a photon of the light c Calculate the minimum energy in kJ mol of the Br Br bond

Question 2 When a solid is converted directly to a gas the change of state is called A freezing B melting C boiling D condensation E sublimation

Match the Carter administration term with its description mujahideen Iran Hostage Crisis Camp David Accords stagflation Three Mile Island Organization of Petroleum Exporting Countries OPEC a b organization that controlled the world s market prices and supply of oil C d 52 Americans were held captive for 444 days e the combination of inflation and slow economic growth included the first peace treaty be tween Israel and an Arab country Islamic fighters who opposed the Soviet invasion of Afghanistan

What is the IUPAC name of the following CH CH CHCHCOCH CH3

Which of the following best describes the one document method used by President Carter Select all that apply A B C D a method to increase trust a method to reduce disagreements a method to enforce agreements a method to punish parties who disagree

the bond energy data in the table below and the enthalpy of reaction AHOns provided above calculate the approximate bond energy of the nitrogen hydrogen bond in ammonia A 0 5 atm B 1 0 atm C 2 5 atm D 4 0 atm Bonds N H H H N N Approximate Bond Energy kJ mol 430 960 13 When 4 0 L of He g 6 0 L of N g and 10 L of Ar g all at 0 C and 1 0 atm are pumped into an evacuated 8 0 L rigid container the final pressure in the container at 0 C is Hint 0 C 1 0 atm are STP conditions i e 22 4 L mol applies NO CALCULATORO

14 A 10 0 grams sample of CS D is put in an evacuated 5 0 L rigid container The container is sealed and heated to 325 K at which temperature all of the CS2 1 has vaporized The boiling point of CS is 319 K at 1 atm What is the pressure in the container when all of the CS has vaporized hade 15 A hydrocarbon gas with an empirical formula of CH has a density of 1 88 g L at 0 C and 1 00 atm a Calculate the molar mass of the drocarbon Hint PM dRT AND b Determine the molecular formula of the hydrocarbon 16 The ideal gas law best describes the properties of which of the following gases at 0 C and 1 atm A PH3 B HBr C SO D

Formula SO3 SC16 NH3 BC13 IC13 llowing molecular structures Draw the Lewis Structure Label the shape VSEPR of the molecule List the bond angle Label the molecule as polar having a dipole moment or nonpolar List the hybridization of the central atom Lewis Structure VSEPR Geometry Bond Polar or Angle s Nonpolar ni

A solution is labeled 3 5 NaCl If the total solution mass is 250 grams how many grams of NaCl are present O 8 75 g O 875 g O 0 014 g O 12 5 g

18 Account for each of the following obs answers use appropriate principles of chemical bonding and or intermolecular forces In each a Even though NH3 and CH4 have similar molecular masses NH3 has a much higher normal boiling point 33 C than CH4 164 C b At 25 C and 1 0 atm ethane C H6 is a gas and hexane C6H 4 is a liquid c Si melts at a much higher temperature 1 140 C than Cl 101 C Shiley3 d Men melts at a much higher temperature 2 852 C than NaF 993 C

Which of the following if any exhibits pure nonpolar covalent bonding Be sure to choose all correct answers a SF2 b Br2 c HBr d NaBr

What is the mass percent of copper II sulfate present if 69 9 g of copper II sulfate solute is mixed to form a solution with 0 2551 kg water solvent O 3 6 O 27 4 O 32 5 O 21 5

or a GAS dissolved in a liquid solution as the temperature increases the solubility of the gas This is a relationship

For this equation NH4 2 Cr2O7 8 Cr O3 s N g 4H O g an engineer has to calculate the volume of gases that are produced under standard temperature and pressure conditions given that 1 458 g of ammonium dichromate will decompose Select the three values that they need to solve this problem the molar mass of nitrogen gas Avogadro s number 6 02e23 particles mol the molar mass of water the molar mass of ammonium dichromate The molar ratio from the balanced equation STP molar gas volume 22 4 L mol

Note For the question below a complete ground state electron configuration of 1s22s1 would be typed as 1s22s1 do not include any spaces or commas when typing your configurati What is the complete ground state electron configuration of Ga How many unpaired electrons are in a Ga atom in its ground state enter only a number

True False According to the Heisenberg principle no two electrons in the same atom can have the same quantum numbers O True O False

Identify parts A E on the following energy diagram Energy Increasing 1 1 I 1 1 1 1

Which of the following is the appropriate equilibrium expression for this reaction H2 g Cl2 2HCl Select one O a PHC PH2 PC12 O b 2 PHCl PH2 PC12 O c PH2 PC12 PHC O d PH2 PC12 2 PHCl PH2 PC12 PHC e

a Which of these general types of substances would you expect to dissolve readily in water Select all that apply 0 salts 0 alcohols hydrocarbons nonpolar molecules polar molecules metals

4 You click on a news item and you hear a reporter say the recent hurricane was caused by climate change Which of the following would be most accurate O Many years of data show that climate change causes hurricanes O Data suggests that hurricanes are more likely to happen now that the climate is warming 5P O There is no data connecting climate change to the frequency or intensity of hurricanes OIt is more likely based on the data that the hurricanes are causing climate change

Which of the following molecules is an enantiomer of this molecule OA O 8 OC OD OE HO H HO HO HO HO HO HO H H H H HO HO HO H H HO H H CHO H OH H H CH OH CHO H H H H CH OH CHO OH OH OH OH CH OH CHO H H H OH CH OH CHO f OH H OH OH CH OH C H H C OH HO C H H C OH H C OH Question 5 of 36 HO C H H

hall metal bar whose initial temperature was 30 C is dropped into a large container of boiling water How long will it take the bar to reach 70 C if it is known that its temperature increases 2 during the first second The boiling temperature for water is 100 C Round your answer to e sec long will it take the bar to reach 95 C Round your answer to one decimal place

is a second ce of iFrame to whatever dimensions you onsider the reaction below Use the balanced chemical quation to fill in the blanks of the table A 4 NH3 6 NO B C DE Tap on a table cell to enter or edit its value moles of moles of moles of moles of NH3 NO N H O 4 0 5 0 6 8 Not checked 5 N 6 H O 12 0 Color Coding Key Incorrect Correct 3 0 9 0 Entering answer

Which of the following experimental plans will test the effects of pressure on a reaction with gases and what is the expected result Keep temperature constant and increase the pressure of the reaction reaction rate will increase Keep temperature constant and decrease the pressure of the reaction reaction rate will increase Keep pressure constant and increase the temperature of the reaction reaction rate will decrease Keep pressure constant and decrease the temperature of the reaction reaction rate will decrease

The gas tank of a 2014 Dodge Charger holds 19 1 gallons How many pounds of carbon dioxide are produced by burning an entire tank of gas Express your answer rounded to the nearest tenth of a pound lb of CO

A researcher wanted to observe what would occur if increasing amounts of energy were added in the lab Light the visible spectrum violet frequency 750 THz wavelength 400 nm photon 3 1 energy indigo blue green 675 630 590 445 475 510 2 8 2 6 2 4 yellow orange 525 510 570 590 2 2 2 1 red 460 650 1 9 PH 41 44012 380 780 1 6 Select the correct prediction and explanation of what would likely be seen from the absorption of 2 0 eV

5 Copper II sulfate reacts with aluminum to form aluminum sulfate and copper metal in the following reaction a How 3 CuSO 2 AI AL 50 3 Cu copper will be produced from 2 00 moles of aluminum many moles of b What is the mole ratio of aluminum to copper c What is the mole ratio of copper II sulfate to copper metal

Which of the following is incorrect about the compound shown below OA B O D H CH OH H Kevey OH H OH OH OH H It is carbohydrate CH OH H One of the products of its hydrolysis is It is a disaccharide H OH OH OH H CH OH H OH 0 H OH Time Remaining H OC Two monosaccharides in it are joined by an a glycosidic linkage bond OH

1 In equation 1 what do the numbers 238 and 92 written to the left of the symbol U represent 2 Explain how both mass number and atomic number have been conserved in equation 1

tion to form glucose and fractose Both products have the 11 Consider the reaction and rate data in the table below me formula CH 0 The rate of this reaction has been studied in acid solution and the data in the table were obtained Tima Be GHO aq H O C 2C H O aq 140 210 C 2011 mol L 0 316 0 274 0 238 0 190 0 146 a Write the table needed and the axes to plot to determine whether this reaction is 1 order b Write the table noodod and the axes to plot to determine whether this reaction is 2nd order

Which set of coefficients will correctly balance the following chemical equation H N NH3 O1 1 1 3 2 1 2 1 3

2 points Which of the following statements are TRUE about ammonia molecule NH3 molecule select all that apply wrong choices will be penalized Hint Draw Lewis structure The molecular geometry is tetrahedral The molecule has three T pi bonds The H N H bond angles are less than 109 5 degrees The molecular geometry is trigonal pyramidal The N H bonds are polar and the molecule is polar The nitrogen atom is sp hybridized

use that day had an activity of 4 52 x 10 6 Ci Part 1 Your answer is correct Choose the equations needed to calculate the activity Part 2 k t 2 ln2 k ln2 t 2 In A A kt In A A t kt eTextbook and Media Tagnosis in medicine A sample prepared in the early morning for Attempts 1 of 15 used

Ca n Ca 4 20 20 23 U n Ru 3 n 5 44 OH H H 6

Enter your answer in the provided box A 0 2879 g sample of a monoprotic acid neutralizes 29 6 mL of a 0 06503 M KOH solution Calcul the molar mass of the acid g mol

Use the cane is burned as a lighter fluid in disposable lighters te a balanced equation for the complete oxidation reaction that occurs when butane C4H10 burns i e the smallest possible integer coefficients

describes general equilibrium A At equilibrium the reaction has stopped B There is only one set of equilibrium concentrations that equals the Kc value C At equilibrium the rate of the forward reaction is the same as the rate of the reverse reaction D At equilibrium the total concentration of products equals the total concentration of reactants