General Questions and Answers

A solution is made by mixing 100 mL of water and 23 8 g of glucose powder What is the concentration of glucose powder in units of mass volume percent O 23 8 m v O 19 2 v v O 4 2 v v O 0 192 v v

The amino acid glutamine is of type O nonpolar polar O acidic basic

Determine the partial pressures and the total pressure in a 2 50 L vessel containing the following mixture of gases at 17 8 C 0 0274 mol He 0 0571 mol H and 0 149 mol Ne PHe PH PNe P Total atm atm atm atm

replacement reaction 1 2 3 4 2Al s 3Cl g 2AlCl3 s 2Al s 6HCl aq 2AlCl3 aq 3H g 2AICI3 s 2Al s Cl g AICI3 aq 3KOH aq Al OH 3 s 3KCl aq

A sample of H gas 12 28 g occupies 100 0 L at 400 0 K and 2 00 atm A sample weighing 9 49 g occupies Lat 353 K and 2 00 atm

Listen A mixture of He and Ne at a total pressure of 0 95 atm is found to contain 0 32 of He and 0 56 mol of Ne The partial pressure of Ne is atm

Question 15 What volume of concentrated 1 5M is required to prepare 25 mL of a 7 0M solution O 117L O 117mL O 5 36L O 5 36mL

pH below 7 pH of 7 taste sour pure water bleach produces OH produces H pH above 7 taste bitter feels slippery lemon juice hydrogen acceptor hydrogen donor equal of H and OH Lithium Phosphorous Lithium Phosphorous Nitrogen Chlorine Aluminum Give oxidation number charge for Nitrogen Chlorine Aluminum Calcium Selenium Calcium Selenium

Which statement below is false The large electronegativity difference between hydrogen and an F O or N atom is essential for the formation of a hydrogen bond A hydrogen atom must be bonded directly to fluorine oxygen or nitrogen to exhibit hydrogen bonding A hydrogen bond is only 2 5 the strength of a typical covalent bond A hydrogen bond is the strongest of the intermolecular forces

Problem 5 Determine the overall cell reaction and Ecell at 25 C of the following galvanic cells a Fe s Fe2 aq Agt aq Ag s O Fe Fe 2 aq R Ag Y e 99 eu 0 440 d Ag s x2 0 800 0 36 V b Pt s H2 g H aq Br20 Br aq Pt s

1 If 1 00 mol of nitrogen gas and 1 50 mol of oxygen gas react what is the limiting reactant and how many moles of NO are produced from the reaction N O 2 NO 2 If 1 00 mol of nitrogen gas and 0 500 mol of oxygen gas react what is the limiting reactant and how many moles of NO are produced use the equation in 1 3 If 1 00 mol of nitrogen monoxide gas and 1 00 mol of oxygen gas react what is the limiting reactant and how many moles of NO are produced from the reaction 2 NO 0 2 NO 4 If 1 00 mol of nitrogen monoxide gas and 0 250 mol of oxygen gas react what is the limiting reactant and how many moles of NO are produced from the reaction use the equation in 3

Points 3 A student takes a 4 0 kg rock 5 6 m straight up to the third floor and drops it to the ground Calculate how fast the rock will be moving a half way down and b just before it hits the ground 7 4 m s 10 47 m s 5 2 m s 8 3 m s O4 3 m s 7 6 m s 3 7 m s 6 4 m s

Given the enthalpies of reaction S s O g SO2 g AH 297kJ 2S s 30 g 2SO3 g AH 791kJ Calculate the enthalpy change AH for the reaction 2SO2 g O2 g 2SO3 g

Combining His and Trp into the dipeptide His Trp will release a molecule of water True False

ball stick labels How many carbons are in cholesterol Of these how many are not contained in the

Which of the following are metabolites of the steroid progesterone cortisol 4 androstene 3 17 dione testosterone aldosterone estradiol None of the above

or each entry on he left hydrogenation saturated fatty acid glycerol tristearate Clear All containing only single C C bonds a triester found in animal fats a carboxylic acid with a long chain hydrocarbon group increases the degree of saturation in an oil

Draw an electron configuration for an element with 51 electrons How many of this elements electrons fall into s orbitals Your Answer

Points 2 Question 10 Which of the following is a central idea expressed in the essay On Pockets and Things by A G Gardiner O Social benefits for women O Safety of women in society O Prejudice against women in society O Respect toward men

Determine the number of states for a system containing 1 x 10 16 mol of molecules at a low temperature when only 3 quantum states are equally populated

41 Listen How much heat in joules must be added to a 75 0 g iron block with a specific heat of 0 449 J g C to increase its temperature from 25 C to its melting temperature of

Calculate AH for the process N g 202 g 2NO g from the following information N g O g 2NO g AH 180 5kJ NO g O g NO g AH 57 06kJ

Listen When the electron in a hydrogen atom moves from n 6 to n 2 light with a wavelength of nm is emitted

A gas mixture of Ne and Ar has a total pressure of 4 00 atm and contains 16 0 mol of gas If the partial pressure of Ne is 2 75 atm how many moles of Ar are in the mixture O a 11 0 Ob 5 00

4 The Earth s atmosphere is approximately 78 1 N2 20 9 O2 and 1 00 H O If the air pressure on a given day is 1 25 atm calculate the partial pressure of each gas Equation

What is the specific heat capacity of a substance if it takes 2 0 kJ of heat to warm 481 5 g by 34 9 C Your Answer

Problem E Determine the molarity of Argon gas at 0 00 C and 760 00 torr

9 500 mL Calculate the new temperature of a gas when 1500 mL at 25 C is suddenly compressed to Equation

Determine the standard molar entropy of CO a linear triatomic molecule at P 1 00 atm and T 298 K For this molecule B 0 390 cm and 1333 cm 2 667 cm doubly degenerate and 3 2349 c Express your answer in joules per mole kelvin AEO

6 Calculate the new pressure on a container when a gas at 23 1 kPa and 0 C is suddenly heated to 50 0 C Equation

If 2 56 g of CUNO3 is dissolved in water to make a 0 120 M solution what is the volume of the solution in milliliters volume m

in the left side of this equilibrium constant equation for the reaction of hypochlorous acid HCIO with water K a X 00 S 010 C

3 In the following reactions identify which of the elements are oxidized and which are reduced and enter the name of the element on the line 10 points a Si s 2F2 g SiF4 is oxidized is reduced 2013 3 Cr2 SO4 3 aq Al s Cr s Al2 SO4 3 aq is oxidized is reduced c Cl2 g 2 NaBr aq 2NaCl aq Br2 Here Cl is chlorine is oxidized is reduced

A chemist determines by measurements that 0 080 moles of chlorine gas participate in a chemical reaction Calculate the mass of chlorine gas that participates Be sure your answer has the correct number of significant digits

Complete the following table Some polyatomic ions name 0 11 0 phosphate anion chemical formula 2 Cro 2 so 0 NHA 39 X P

1 Mute Ajen developed survival curves for yeast in the presence and absence of sunscreen SPF30 Note that there are TWO experiments presented in the table below Time UV light sec colonies colonies SPF30 0 100 103 15 89 101 30 49 99 45 35 89 60 0 81 180 0 48 What is the independent variable time of incubation number colonies Otime of UV exposure amount of yeast added

Complete the following table which lists information about the measured acid dissociation constants of three unknown weak acids Note be sure each number you put in the table has the correct number of significant digits acid A B C Ka 5 96 x 10 11 6 5 4 10 0 pK a 0 7 7 5 relative strength Choose one 3 Choose one O Choose one O x10 X C

Which among the following lines phrase that Hester speaks to convey a subtle message to Dimmesdale O Speak thou for mer cried she Thou knowest for thou hast sympathles which these men lack O Thou knowest what is in my heart

Which of the reagents would oxidize I to I2 but not CI to Cl O Ca O Ca O Co Br Co Br

Twenty microliters of iodine was added to 1 ml of a series of starch of known concentrations the absorbances were read and a standard curve was prepared What goes on the Y axis of the graph Starch Concentration lodine concentration the absorbance value here isn t any this is just a standard curve not an experiment

Be sure to answer all parts The illustrations below depict differences in orbital hybridization of some tellurium Te fluorid A C 00 A B C and D and B D a Which depicts the difference if any between TeF and TeFs and and

A chemist measures the amount of iodine solid produced during an experiment He finds that 262 g of iodine solid is produced Calculate the number of moles of iodine solid produced Be sure your answer has the correct number of significant digits mol

A 3 kg box is on a rough horizontal surface An external force F is applied horizontally to the box When force F equals 3 0 N the box is in motion at constant velocity The box slows down when force F is removed The magnitude of the acceleration of the box when force F is removed is closest to 0 1 m s 1 m s 0 m s 0 3 m s

15 If 40 0 mL of a 1 00 M solution of CaCl2 Solution A is mixed with 85 0 mL of pure water solution B and then 37 5 mL of solution B is mixed with 34 0 mL of solution A what is the molarity of the final solution Solution C Moles of CaCl2

38 Dry air is primarily made up of nitrogen 78 09 and oxygen 20 95 Which of these is the solvent and which is the solute Nitrogen Oxygen Classification of Matter Know definition of Matter Be able to give examples of and tell difference between Mixtures and substances non mixtures Homogenous and heterogeneous mixtures Elements vs Compounds Label as Mixture or Pure Substance 1 Pure substance Salt Water Chicken Soup a Made up of two types of matter that can be physically separated 2 Water Salt 3 Mixture Heterogeneous Mixture Two samples might not be the same Silver Chex mix Two samples will have the same makeup Has only one kind of atom in the sample Contains two kinds of atoms that cannot be physically separated Label as Homogenous or Heterogeneous Sugar Water Vegetable Soup Chex Mix Jello w fruit Cannot be separated by physical means A classification of anything that has mass and takes up space Milk Plain Jello 4 Matter 5 Element 6 Homogeneous Mixture 7 Compound b c d C f g

8 Complete and balance the neutralization reactions Choose a coefficient for every species even if the coefficient is 1 Then identify the salt in each reaction a b C Reactant 1 Coefficient Choose Choose Choose Choose Choose Choose T T Reactant 1 Formula HBr aq H SO4 aq HCN aq Reactant 2 Coefficient Choose Choose Choose Choose Choose Choose Reactant 2 Formula Product 1 Coefficient Choose NaOH aq Choose Choose KOH aq Choose Choose Ca OH 2 aq Choose T 4 Product 1 Formula Choose Choose Choose Choose Choose Choose Y Product 2 Coefficient Choose Choose Choose Choose Choose Choose T Table View Product 2 Formula Choose Choose Choose Choose Choose Choose T S Choose Choose Choose Choose List view Choose Choose Salt

Indicate with yes or no to answer the question below Note x means the concentration of x Which of the following will result in an increase in CO CO H O HCO3 H O H O H CO

4 How will you synthesize cyclohexanecarboxaldehyde cyclohexylmethanal from the following reagents There are no restrictions on the reagents or the number of steps a Cyclohexanone b Ethynylcyclohexane c Methyl cyclohexylformate Remember Formic acid is the IUPAC recognized name for Methanoic acid d Cyclohexanecarboxylic acid Cyclohexylmethanoic acid e Vinylcyclohexane

Consider the reaction Cl O g 3 2 O g 2C1O g Given the following data AH reaction 126 4 kJ mol AS reaction 74 9 J mol K Assuming that enthalpy and entropy are largely temperature independent determine AG in kJ at 381K Do not report units in your answer Report your answer as a whole number no places past the decimal point

Consider the following reaction H 8 12 8 2H1 g Given the following data H AH 0 kJ mol S 131 J molk 12 AH 0 kJ mol S 118 J mol K HI AH 23 kJ mol S 200 J mol K Determine the AG in kJ for this reaction at 298K Do not put units in your answer Report your answer with two places past the decimal point