General Questions and Answers

What is the significance derived from last question a It relates to how big the molecule is b It relates to the orbital energy diagram c There is none d It relates to the octet rule

Calculate the mass required to make the following aqueous solution 101 mL of an 0 26 mol L sodium phosphate solution

In a redox reaction which of the following statements is true O Protons are transferred from the oxidizing to the reducing agent O Electrons are transferred from the oxidizing agent to the reducing agent O The oxidizing agent gains electrons and the reducing agent loses electrons O The oxidizing agent gets oxidized and the reducing agent gets reduced The oxidizing agent loses electrons and the reducing agent gains electrons

Which of the Models do you use to come up with the bonding structure of a molecule a Lewis Dot b Orbital Energy Diagram c Bohr d Electronic Configuration

C C5 C6 Methyl methacrylate C7 O f How many and bonds are there in methyl methacrylate bonds He Methyl methacrylate

What are the signs of AH AS for the deposition of CO CO2 g CO2 s O O

9 How much heat will be transferred when 14 9 g of ammonia reacts with excess oxygen according to the following equation Circle one Is this reaction endothermic or exothermic Additionally rewrite the thermochemical equation in the other format 4NH3 502 4NO 6H O AH 1170 kJ 10 How much heat will be absorbed when 38 2 g of bromine reacts with excess hydrogen according to the following equation Circle one Is this reaction endothermic or exothermic

The atomic weight melting point and boiling point of Li and K are listed in the table Lithium Sodium Potassium 6 9 39 1 180 63 4 1330 757 Atomic weight Melting point C Boiling point C Based on the observable trends in these values estimate the corresponding values for sodium Na atomic weight melting point boiling point

1 point In a covalent bond between C and O which atom carries the partial negative charge Catom O atom

7 2 points Which of these elements would be most likely to form 2 Charge when they become ions select all that apply wrong choices will be penalized 000000000 Ca Fe N F Mn O S Mg

Rank the following gases in order of increasing solubility in ammonia NH3 where 1 is the least soluble and 4 is the most soluble SO sulfur dioxide N nitrogen H O water H hydrogen 1 2 3 4 water sulfur dioxide hydrogen nitrogen

An electron in a hydrogen atom is excited from the n 1 ground state to the n 4 excited state Classify the statements abou this absorption and emission process as true or false True On average the electron is closer to the nucleus in the n 4 state than in the n 1 state Answer Bank The wavelength of light emitted when the electron falls from n 4 to n 2 is shorter than the wavelength of light emitted when the electron falls from n 4 ton 1 It takes less energy to ionize the electron from the n 4 state than from the ground state The a 4 excited state is the first possible excited state False The wavelength of light absorbed when the electron is excited from the ground state to n 4 is the same as the wavelength of light emitted when the folle 6

3 Which bones are that the responsible for protecting the heart A The sternum ribs and scapula B The tibia fibula and humerus C The vertebra radius and carpals The patella femur and phalanges D

10 0 points 015 A reaction between gaseous sulfur dioxide and oxygen gas to produce gaseous sulfur trioxide takes place at 600 C At that temperature the concentration of SO2 is found to be 1 89 mol L the concentration of O2 is 1 07 mol L and the concentration of SO3 is 3 75 mol L Using the balanced chemical equation find the equilibrium constant for this system

ts 1 Rank the compounds below from lowest to highest viscosity based on their structures OH CH ots A 1 2 3 propanetriol glycerol B 2 propanol H3C C 1 2 propanediol HO OH CH C H HO CH3 OH CH of CH3 C H OH

a b C 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 Reactant 2 Formula Product 1 Coefficient Product 1 Formula Product 2 Coefficient Product 2 Formula Reactant 1 Coefficient Choose Choose Choose Choose Choose Choose Y 4 Reactant 1 Formula HBr aq H SO4 aq HCN aq Reactant 2 Coefficient Choose Choose Choose Choose Choose Choose NaOH aq KOH aq Choose Choose Choose Choose Choose Ca OH 2 aq Choose Choose Choose T Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Choose Table view Choose Choose Choose Choose Choose Choose Y List v Salt Y

104 Which test will you run if you re looking to check whether or not a series of proposed proportions is accurate given a sample of observations a 1 proportion z test b 2 proportion z test C Chi Square test d Chi Square Goodness of Fit test 105 What type of test do you run to check for independence between two variables given a contingency table a t test b z test c Chi Square test d Chi Square Goodness of fit tast

1 What is the volume of 60 0 g of ether if the density of ether is 0 70 g mL 2 What is the density of 50 0 mL of a substance that has a mass of 25 g 3 List each as being a physical change or a chemical change butter melting butter burning sugar dissolving in water a sandwich getting digested 4 List each as being a physical or a chemical property copper sulfate is blue iron is a solid water melts at 0 C gasoline is flammable magnesium reacts with acid salt is soluble in water

Why do bonds form a To complete the valence shells b To become like noble gases c To increase energy d To decrease the potential energy

32 g of sodium reacts with 4 0mols of hydrogen chloride What volume of 4x8 314x273 4 2 hydrogen gas forms

5 Rank the compounds below from lowest to highest viscosity based on their structures Hint hydrogen bonds formed between molecules with N H groups are weaker than those formed between molecules with O H groups A 1 butanamine CH3CH CH CH NH B 1 hexanamine CH3CH CH CH CH CH NH C methanamine CH3NH D 1 propanamine CH3CH CH NH Normal BIU X 1 X fx lli Saved Tx

A chemistry student weighs out 0 128 g of hypochlorous acid HCIO into a 250 mL volumetric flask and dilutes to the mark with distilled water He plans to titrate the acid with 0 1600M NaOH solution Calculate the volume of NaOH solution the student will need to add to reach the equivalence point Round your answer to 3 significant digits mL x10

A semipermeable membrane allows only half the amount of a substance to pass through it True False

The equilibrium expression for the the reaction H g 1 g 2HI g would be OK H 12 2 HI O K H 12 HI OK 2 HI H 12 OK HI H 12

Consider the following reaction H H C C g Br g H H Br Br kJ mol H C C H g HH Estimate the carbon bromine bond energy given that the CC bond energy is 347 kJ mol the C C bond energy is 614 kJ mol and the Br Br bond energy is 1 kJ mol DcBr AH 92 kJ

ound composed of on carbon and hydrogen has a density of 5 55 g L at 40 0 C and 1 25 atm X Incorrect What is the formula mass of the compound formula mass Hint Correct 8 mol 1 What are the possible combinations of C and H that add up to that molar mass

The rate of a reaction is dependent upon the equilibrium constant O True O False

Methane burns according to the following equation CH4 g 202 g CO g 2H O g The combustion of 7 76 L of CH4 consumes how many liters of O2 both volumes measured at 25 C and 740 torr Volume of O2 i 10 6 L

8 What percentage of the muscular system make up the body s weight A 60 80 B 40 70 C 30 40 D 20 50

The smooth and maintains is an organ system consisting of skeletal muscle It permits and circulates of the body throughout the are controlled through system although some muscles can be completely body The muscular systems in the The system and the muscular system work together The skeletal muscle is involved in the body

11 If 60 grams of sodium chloride were added to 200 grams of water at 30 C would all of the sodium chloride dissolve Explain your answer

Methyl cyanoacrylate is the main component of many glues Below is the Lewis structure for this organic compound Determine the number of pi bonds in the molecule H CEN II HICIH H C C C O C H 0 Type numbers in the boxes 10 points

The molecular views of three gaseous mixtures of helium He A He B A Highest partial pressure of He B N Arrange the mixtures A B and C from the highest to the lowest partial pressure of He gas and from highest to lowest partia pressure of N in the mixtures Lowest partial pressure of He Answer Bank C nitrog pases B Highest partial pressure of N C A Lowest partial pressure of N Answer Bank

In the redox reaction MnO4 aq NO2 aq MnO2 s NO3 aq which element is oxidized and which is reduced O Mn is oxidized and O is reduced O Mn is reduced and O is oxidized Mn is oxidized and N is reduced O Mn is reduced and N is oxidized O is reduced and N is oxidized

Which of the following CANNOT be displayed in Fourier spectrum O phases of harmonic components O all three listed Oharmonic components amplitudes of harmonic components

A sample of an ideal gas has its absolute temperature doubled while its volume remains constant If the original pressure was 100 torr what is the new pressure O 10 psi O 25 mmHg 50 torr 0 132 atm O 200 mmHg

Which types of orbitals are able to do sigma bonding d

1 Reaction 1 H2 g C12 g 2HCI g AH 184 6 kJ Reaction 2 20F2 g 02 g 2 F2 g AH 49 4 kJ Reaction 3 N2 g 202 g 2NO2 g AH 66 4 kJ Use Reaction 2 How much energy in kJ is released when 49 0 g of oxygen difluoride decomposes 2 Reaction 1 H2 g C12 g 2HCI g AH 184 6 kJ Reaction 2 20F2 g 02 g 2 F2 g AH 49 4 kJ Reaction 3 N2 g 202 g 2NO2 g AH 66 4 kJ Use Reaction 3 How much energy in kJ is absorbed when 190 L of nitrogen dioxide is created at STP

12 Arrange the following acids according to their strength starting from the weakest to the strongest writing from left to right HCIO4 NH4 H2PO4 Ga H2O 6 HCI CH3COOH

chelating agents a Dimethylglyoxime b EDTA

8 Explain in details how can you prepare 5 L with the concentration of 50 mM copper sulfate solution from CuSO4 5 H2O Note what is the mol mass of CuSO4 5 H2O

13 True or False Muscles work and produce an important byproduct oxygen A True B False

Amelia tests several substances in her house to determine their pH values and records the results pH 2 3 6 7 12 3 11 7 Substance Lemon juice Tap water Bleach Soapy water Can of tomatoes 4 5 Dishwasher detergent 10 9 What do the basic substances have in common A B C D They are all used in cleaning products They are od in cooking i ney are all clear or transparent They are all sour tasting when eaten

1 Which of the following is a function of the skeletal system A To produce skin cells B To provide shape and structure C To give allow urine to pass D To create organs

5 What minerals are stored in the skeletal system A Vitamin A and D B Mineral Oil and Sodium C Calcium and Phosphorus D Potassium and Sulfur

12 Ammonia NH3 combines with oxygen according to the balanced equation below What is the limiting reactant if 2 75 moles of NH3 combines with 2 15 moles of O 4 NH3 3 0 2 N 6H O limiting reagent Choose

For a 25 0 m v MgCl solution 1 What is the molarity The GFW for magnesium chloride is 95 21 g hint find the g in 1000 ml then convert to moles there are 25 0 g in 100 mL so there are 250 g in 1000 mL 25 0 g 1000 mL g X mol g M

Potential Energy 400 300 200 100 O 400 kJ 100 kJ O 300 kJ Reactants 200 kJ Activated complex a Reaction Pathway What amount of energy is absorbed in the completion of the forward reaction b c Products

Consider the following elements as you construct your initial model The shape of Earth s orbit The tilt of Earth s axis Be sure to include labels to explain how both factors can lead to changes in global climate We will revise your model in different colors as we acquire You will either turn in a hardcopy of your model or you will take a picture of it and paste it here

Calculate the amount of solute necessary to prepare 500 ml of solution with molarity of 0 100 Use the value from the purple CONCENTRATION display Of cus04 Hint Volume needs to be changed to Liters In order to transition from of moles to grams you need to use MM molar mass Think about the chemical formula of the solute you used Periodic table will help you to determine molar masses of the solute Represent your answer with 2 SF AU