Classification of Elements and Periodicity Questions and Answers

The following set of data was obtained by the method of initial rates for the reaction H3C 3CBr OH H3C 3COH Br What is the value of the rate constant k H3C 3CBr M OH M Initial Rate M s 0 25 0 25 1 1 10 4 0 50 0 25 0 50 0 50 1 8 10 4 5 1 none of these 4 4 x 10 4 S 1 8 8 x 10 4 5 1 2 2 10 4 2 2 x 10 4

In which of the following series are the diatomic molecules arranged in the order of increasing bond length OF2 Cl ICI BrCl 12 OF2 Cl BrCl ICI 12 OF2 BrCl Cl I2 ICI OF2 Cl2 BrCl 12 ICI Fo IC BrCL Cla la

Each of the following pairs contains one strong acid and one weak acid except O HNO3 and H CO3 O HF and HOCI O H SO4 and H S O CH3COOH and HCI H PO and HRr

2 How is activation energy similar to an uphill climb in a ski slope 3 What type of biological molecules are enzymes

When lipid bilayers are disrupted they are able to spontaneously reseal Why

2 What effect does changing temperature and pH have on enzyme activity

What happens to the shape of an enzyme when it is exposed to unfavorable temperature and pH

A 2 5 L sample of unknown gas has a mass of 12 0 g and a pressure of 1 5 atm at 35 0 C What is the identity of the unknown gas Ohydrogen gas O hydrogen bromide O carbon monoxide Ochlorine gas

Explain how lipids make a cell membrane impenetrable to ionic and polar substances

10 Name the enzyme that catalyzes the following reaction LACTOSE 89 WATER 1 name of enzyme G G

8 Which gland secretes enzymes into small intestine 9 Give one example of commercial use of enzyme

Fill in the blank Ethanol can readily be prepared from a reaction between water and in the presence of a small amount of sulfuric acid Oglucose O sucrose O ethanal O ethane

What is the function of proteins in the cell membrane

160 5 mol of an ideal gas is at 1 47 atm at 47 70 C what is the volume of the ga

3 What would you expect to see if catalase that has been exposed to suboptimal conditions is placed with hydrogen peroxide

For each of the following statements determine if it describes nuclear fission nuclear fusion or both 15 takes place in stars 16 used for energy via nuclear power plants 17 unstable atomic nuclei become more stable via this reaction 18 involves a larger nuclei breaking into smaller particles A Fission O O O O B Fusion O O O C Both Fission Fusion O O O O

1 When you place catalase with hydrogen peroxide what do you expect to see

4 What is an enzyme substrate complex 5 In which system of our body do enzymes work outside cells

6 Two compounds of nitrogen nitrogen tetroxide N O and hydrazine N H4 are used as rocket fuels When the two compounds are mixed they ignite spontaneously and produce nitrogen gas and water Balance the following equation for the reaction III a N O4 1 N g H O g b If 8 00 g nitrogen tetroxide and 4 00 g hydrazine are mixed determine the following quantities 1 limiting reactant N H 1 2 mass of product N 3 mass of excess reactant

32 Identify the missing particle X in the following nuclear reaction 23994Pu 4 He X OA 235 6Cm B 24392 Cm C 24392U OD 23592U OE None of the above

How does increasing surface area of the reactants affect the rate of a reaction increases reaction rate O does not affect reaction rate decreases reaction rate not enough information provided to answer

Use the standard enthalpies of formation to calculate the AH in kJ mol of isopropanol combustion 2 C3H8O 1 9 O g 6 CO g 8 H O g AH kJ mol 318 1 Formula Bromine Br g Br HBr g Calcium Ca s CaO s CaCO3 s Carbon C s graphite C s diamond CO g CO g CH g CH OH C H g C H4 g C H6 g C H5OH C3H g C3H6O I acetone AH kJ mol 111 9 0 36 3 0 634 9 1207 6 0 1 88 110 5 393 5 74 6 238 6 227 4 52 4 84 68 277 6 103 85 248 4 Formula C3H8O I isopropanol C6H6 C6H12O6 s glucose C12H22011 s sucrose Chlorine Cl g Cl g HCI g Fluorine F g F g HF g Hydrogen H g H g Nitrogen N g NH3 g NH4NO3 s NO g N O g 49 1 1273 3 2226 1 121 3 0 92 3 79 38 0 273 3 218 0 0 0 45 9 365 6 91 3 81 6 Formula Oxygen O g 03 g H O g H O Silver Ag s AgCl s Sodium Na s Na g NaCl s Na CO3 s NaHCO3 s Sulfur Sg s rhombic Sg s monoclinic SO g SO g H SO4 1 AH kJ mol 0 142 7 241 8 285 8 127 0 0 107 5 411 2 1130 7 950 8 0 0 3 296 8 395 7 814 0

35 In what way is 14C nucleus changed to 14N nucleus by this decay 14Cle 14N A In the above reaction a proton is converted to a neutron B In the above reaction a neutron is converted to a proton O C In the above reaction a positron is converted to an alpha particle D There is no change in the nucleus because the mass remains 14 E None of the above is true

Water Which would be best for thermally insulating not transferring heat Glass Substance Elements Lead Gold Silver Copper Iron Aluminum Compounds Ethanol Water Materials Glass Pyrex Granite Sand At 298 K Specific Heat Capacity Cs J g C 0 128 0 128 0 235 0 385 0 449 0 903 2 42 4 18 0 75 0 79 0 84

Give the expression for the Ksp for the following Ksp O A Ca 2 CO32 CaCO3 B CaCO3 Ca CO3 O C CaCO3 OD Ca CO3 CaCO3 s Ca 2 CC

135 kJ of energy is applied to a 20 0 kg iron bar at 19 8 C What temperature in C will it heat to

le The density of aluminum 15 3 2 70 g cm what is mass of a piece of aluminum w volume of 1 50 cm 4 20 4 05 0 556 an

to acc ess important values if How many protons neutrons and electrons are there in a neutral atom of the isotope of gallium named gallium 65 protons neutrons electrons

For each bond show the direction of polarity by selecting the correct partial ch 8 Si s CI S Cl Si 8 O O The most polar bond is blome Varian ante remaining

How many moles of Mn are there in 107 grams of Mn moles

Answer the following questions Show your calculations clearly where applicable 1 Arrange the following substances in order of increasing boiling point bp 4 pts a CH3CH OH b SO2 c CH OH highest bp Lowest bp

Generally the higher degree of unsaturation of a fatty acid the lower the melting point Explain why this is the case

A gas occupies 25 7 L at 2 00 atm pressure and 27 C How many moles of gas are present in the sample O 23 2 mol O 1 04 mol O 2 09 mol O 3 59 mol O 4 49 mol

Is the change represented by the following illustration best categorized as a chemical change or a physical chang In the illustration H is color coded as white and O is color coded as red C 8 8

will take more energy to melt a gram of ice than to melt a gram of solid iodine O True O False Question 17 Which of the following has the lowest vapor pressure O H O NaCl O NH3 respectively It 1 pts

The total mass of a solution is 178 7 g The solvent mass is 125 2 g What is the mass percent of the solute O 70 1 O 40 9 O 29 9 O 20 1 O Not enough information is given

4 Both of the following reactions are saponifications Does that mean that the product in each case is soap Explain CH CH C OCH3 NaOH OCH O CH CH 16 C OCH NaOH CH CH C ONa CH OH ONa C ONa CH CH 6C ONa CH OH

7 Discuss the fluid mosaic model of membranes Explain why the percentages of protein lipid and carbohydrate vary depending upon the type of membrane

What does the term amphipathic mean Design some molecules that would act like soap but will not form insoluble salts in hard water

a catalyst support in acidi 22 which one of the following can not used as a medium Calcium carbonate Al2O3 Zedite Silica

Write an appropriate discussion for this experiment Include a discussion about the similari ties and differences between the reactions when early representative metals Group 1 Group 2 or zinc react with water and HCl How does the activity series for metals related to your results in this experiment Why is it possible to use the acid base titration to determine the chemical formula of the product formed when calcium reacts with water

for what value of 2 the Magnese Ion have value of magnetic moment UB is zero mot

Ice bag therapy is used by sports trainers to treat muscle injuries If 118 grams of ice are placed in an ice bag how much heat in kilojoules will be absorbed to melt all the ice at 0 Celsius Hint the answer choice is either positive or negative depending on if the energy is absorbed or released The heat of fusion for ice is 334 joules per gram O a 39 4 kJ O b 30 5 kJ O c 31 9 kJ O d 33 7 kJ O e 32 4 kJ

Explain why primary standard sodium carbonate should be weighed by difference from the weighing bottle

Two beakers are filled with different liquids A steel ball is dropped simultaneously into each beaker 1 1 I 1 I 1 C Drag the slider to see what happens The stopwatch shows the time since the balls were dropped Liquid A Liquid B Note the liquids have the same density What s different about liquids A and B Your answer should be the one or two word name of a physical property S

The end product of the humoral immune response is O Increased pathogen numbers Activated cytotoxic T cells O Antibody production

Sodium Hydroxide Solution NaOH www Metal Cation Ca Zn Pb Cu Cr3 Fe Fo3 Observation must include ionic equation that represents the observed reaction

On hot days you may have noticed that potato chip bags seem to inflate even though they have not been opened If I have a 450 mL bag at a temperature of 20 0 C and I leave it in my car which has a temperature of 50 0 C what will the new volume of the bag be

of the following describes the element He se all that apply reacts vigorously with alkali metals to form salts is one of the group of the least reactive elements consists of diatomic molecules in elemental form is very reactive as a metal forms a basic solution in water belongs to a group consisting entirely of gases mit Answer Retry Entire Group 6 more group attempts r

Erwin Schr dinger Orbitals which result from solving the Schr dinger wave equation can be represented by electro pictures Match the orbitals below with their kind and identify their shapes Put letters in alphabetical order If none are correct leave the box blank A 1 s orbital 2 p orbital 3 d orbital B s orbitals have a p orbitals have a d orbitals have a C shape shape shape D