Classification of Elements and Periodicity Questions and Answers

Which of the following has the greatest number of unpaired electrons in its ground electronic state A Ar B Na C S D Mg E P

What is the major product formed from the following reaction CH3CH CH OH CH3CH OH OCH CH COOH OCH3CH OCH CH3 CH3CH COCH CH3

The total number of molecular orbitals formed doesn t always equal the number of atomic orbitals in the set True False

Which reaction below represents the first ionization of O Oo g e 02 g OO g e O g Oo g O g O g e O g O g e OO g e O g

Place the following in order of decreasing metallic character P As K

Which statement below regarding electron affinity is FALSE Zeff has no impact on electron affinity values Electron affinity values are usually negative because the association of an electron w positive nucleus should produce an ion that is more stable Electron affinities become more positive as atomic size increases Electron pairing in orbitals can have an impact on electron affinity

Pick the larger species from each of the following pairs Match the words in the left column to the appropriate blanks in the sentences on the right Lit I Cs Mo Mo Between Li and Li the larger species is Li Between I and Cs the larger species is Between Mo and Mo the larger species is Between O and O the larger species is R

Calculate the wavelength in nm of the blue light emitted by a mercury lamp with a frequency of 4 25 x 1014 Hz 602 nm 466 nm O 706 nm O 526 nm 103 nm

Label all bonds on the sketch of the structure Drag the appropriate labels to their respective targets Labels can be used once more than once or not at all 7 N sp H s 7 N p H s N sp N sp o N p N p N sp N sp 7 T N p N p Lone pair in N sp H H Reset Help

Ammonium nitrate NH4NO3 can decompose to form gaseous water nitrogen and oxygen What is the sum of the coefficients in the balanced chemical equation 5 6 7 8

A reaction has a theoretical yield of 45 8 g When the reaction is carried out 27 2 g of the product forms What is the percent yield 35 1 168 44 8 81 2 50 1

The analysis of a chemical compound gives the percent composition by mass C 44 4 H 6 21 S 39 5 O 9 86 Calculate its molecular formula given that its molar mass is about 324 56 g mol C C 44 4 12 01 3 697 10 616 6 00 H 6 21 1 008 6 161 0 616 10 00 5 39 5 32 065 1 232 0 616 2 2 9 86 16 00 0 616 10 616 1

Chlorophyll the green pigment found in plants absorbs visible radiation best in the red region 675 nm and in the blue violent region 440 nm What is the energy of the photons collected by plant at 675 nm When submitting answers in scientific notation please use E to represent x10 An example would be 4 1 x 10 2 this would be counted correct as 4 1E 2

Classify each of the following changes as physical or chemical Drag the appropriate items to their respective bins The liquid propane in a gas grill burns in a flame Natural gas burns in a stove Physical change Reset Help A bicycle frame rusts on repeated exposure to air and water The liquid propane in a gas grill evaporates because the user left the valve open Chemical change

Part B Indicate the hybridization about each interior atom in N H whose skeletal structure is HNNH Match the items in the left column to the appropriate blanks in the sentences on the right sp sp sp trigonal planar tetrahedral The left interior N atom has hybridization The right interior Natom has hybridization electron geometry and Reset electron geometry and Help

Indicate the hybridization about each interior atom in N H4 whose skeletal structure is H NNH Match the items in the left column to the appropriate blanks in the sentences on the right trigonal planar tetrahedral trigonal bipyramidal sp sp The left interior N atom has The right interior N atom has electron geometry and electron geometry and Reset hybridization hybridization

Drag the appropriate items to their respective bins the tendency of ethyl alcohol to burn the odor of hydrogen disulfide Physical the flammability of methane gas the shine of silver Reset Chemical Help

Calculate the mass in grams of iodine that will react completely with 20 4 grams of aluminum to form aluminum iodide Hint You need to write and balance the chemical equation for this reaction 8 pts 2171 3I ZA113

Water can be separated into its elements according to the following equation by electrolysis If 20 0g of water is decomposed by this method how much oxygen gas is produced 2 H O g 2 H g O g 17 8 g 16 0 g 10 0 g 8 90 g 35 6 g

The concern about caramel is that it adds excess calories to cola beverages is that it raises blood glucose levels None of these responses is correct is that it is contaminated with the carcinogen 4 methylimidazole is that it is addictive and increases cola consumption O is that it is contaminated with the carcinogen acrylamide

MISSED THIS Watch IWE 4 15 Read Section 4 11 You can click on the Review link to access the section in your eText A 0 57 mg sample of nitrogen reacts with chlorine to form 4 897 mg of the chloride Part A What is the empirical formula of nitrogen chloride Express your answer as a chemical formula View Available Hint s AF 2

MISSED THIS Watch IWE 5 12 Read Section 5 9 You can lick on the Review link to access the section in your eText Molecular geometry Electron Bonding Lone Molecular groups groups pairs geometry 0 2 3 3 4 4 2 3 AN 2 4 3 0 1 0 1 Linear Trigonal planar Bent Tetrahedral Trigonal pyramidal Make a sketch of the following molecule C H4 skeletal structure H CCH Draw the molecule by placing atoms on the canvas and connecting them with bonds Include all hydrogen atoms and nonbonding electrons View Available Hint s O 8

Which ion below is linear O NO O SCN O SO3 2 O NH4

Determine the molecular geometry about each interior carbon atom of this molecule View Available Hint s bent linear trigonal pyramidal tetrahedral O trigonal planar

reaction Pb s Cl2 g PbCl2 s Trial 1 2 3 Or k pb Cl Or k Pb Cl Or k Pb Or Pb Cl 2 Initial Pb mmol L 0 45 0 45 0 90 Initial CI mmol L 0 15 0 30 0 15 Rate of Formation of PbCl2 mmol L s 0 08 0 16 0 32

Identify the compound with the largest dipole moment in the gas phase LiF F2 O Cl

List the following compounds in decreasing electronegativity difference Cl HCI HCI KCI

What is the formal charge of the nitrogen atom in hydrogen cyanide HCN Paragraph B I U A 8

4 The diameter of a bacterium is 1 um and the diameter of the Herpes Virus is 130 nm Approximately how much smaller is the Herpes Virus than the bacterium in um Show all your work

Determine the polarity of a sulfur hexafluoride SF6 b phosphorus pentachloride PC15 c bromine pentafluoride BrF5

Correctly balance the following redox reaction under acidic conditions 2 Cu s NO3 aq Cu aq NO2 g 2 Cu aq Cu s 2 NO3 aq Cuq 2 NO2 g 2 H O 1 2 Cu s 2 NO3 aq 2 H O 1 Cuq 2 NO2 g 4 H Cu aq aq O Cu s 2 NO3 aq 2 Haq Cu 2 NO2 g 2 H O 1 2 H Cu s 2 NO3 aq 4 H 2 Cuq 2 NO2 g 2 H O 1 aq

Convert 0 750 g to A gram is a unit of mass g g b

Cholesterol in the diet boosts trans fats in the blood Aspirin can be used to treat hemophilia Lignans have anti cancer effects O Grape seed extract increases the number of senescent cells in the body None of these statements is correct Resveratrol in wine is an antioxidant but is also a known carcinogen Question 14 1 point Changes in taste and smell can be caused by a deficiency in iron Tollowing is correct zinc selenium iodine calcium

You are using the specific heat formula Q mcAt to calculate the amount of heat released by an object What are the units of the specific heat constant if you want to communicate your answer in SI units J gK kJ kg C J g C J kg F

Sodium fluoride cannot be used to prevent tooth decay None of these statements is correct Calcium is needed most by elderly men as opposed to elderly women Mineral supplements are usually recommended for most of the population Many calcium pills are made of the same material as limestone O Salt substitutes are usually potassium iodide about salts in the diet is correct Question 4 1 point Which one of the following would be a component of innate immunity None of these options is correct SARS CoV 2 antibodies antigen histamine spike protein

The rate law equation for a first order reaction is a mathematical expression that states Or r k A Or k r k Or K A Or K A

Choose the half reaction that indicates that a reactant has been reduced OFe q 2 Fe 29 e HNO2 aq H O 1 NO3 aq 3 Ha 2 e aq O Ca 2 e Ca s aq O 2 Claq Cl2 g e

Which of the following is the correct NET ionic equation when zinc metal is added to aqueous lead II sulfate Pb s Znq Znaq Zn s Pb aq Zn s Pb aq 2 2 SO4 aq Pb s Zn SO4 q aq Zn s Pb Pb s Zn aq Zn s PbSO4 aq Pb s ZnSO4 aq

Pick the right MO molecular orbital energy diagram of the cyclooctatetraene A O A OB OC B C D

3 Convert 0 750 g to A gram is a unit of mass a ug b mg bacterium is 1 um and the diameter of 4 The diameter of a the Herpes Virus is 130 nm Approximately how much small in the Harnes Virus than the bacterium in um Show

Setting What makes Aven realize she might not fit in at her new school TYPE HERE 2 Explicit Details What does Aven do in the morning because she is nervous TYPE HERE 3 Plot What happens when Aven sits down in Science class How does the student next to her respond TYPE HERE 4 Inference Why do you think Aven s stomach cramps when she starts to eat her lunch TYPE HERE

Based on the positions of the atoms in the periodic table arrange the following bonds in order of increasing bond length CO SIO CIC

A laser pulse with a wavelength of 545 nm contains 4 85 mJ of energy How many photons are in the laser pulse Express the number of photons to three significant figures View Available Hint s N AEO photons

a Cd V b I Kr 5s 4d105p5 Kr 5s 4d10 c Ag Kr 5s 4d10 1 Cd 2 I 3 Ag

Substance X has a triple point of 5 2 atm and 57 C and a critical point of 72 8 atm and 31 1 C In what state will X exist at 20 0 C and 53 200 torr a solid Ob liquid Oc gas O d supercritical fluid

MISSED THIS Watch KCV 2 5 IWE 2 7 Read Section 2 5 You can click on the Review link to access the section in your eText Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions Part B n 5 n 1 Express the frequency in inverse seconds V A O

B H In which pure compound s will hydrogen bonds form between the molecules H4 H A H H Jx H H it H

options An acid that has a pH greater than 7 Impossible to tell with the information provided A solution that has a high concentration of hydroxide and hydronium ions An acid that completely dissociates when added to water An acid that partially dissociates when added to water Question 12 What is the concentration of a solution that is 0 25 moles of HCL added to 3 00L of water options 12 00 M HCL 12 00 moles HCL 0 75 M HCL 0 75 moles HCL Impossible to determine with the information provided 0 08 M HCL 0 08 moles HCL Question 13 What answer below best describes nuclear fusion options A nuclear reaction where two small atoms merge together to form a new atom and absorb a significant amount heat A nuclear reaction where two small atoms merge together to form a new atom and release a significant amount heat A nuclear reaction where one large atom breaks apart and releases significant amount of heat

A 1 L compressed tank is filled with Hydrogen gas and has a pressure of 100kPa If all of the Hydrogen gas is removed from the tank and pumped into a 250mL tank what happens to the pressure options The pressure in the 250 mL tank decreases The pressure in the 250mL tank increases The pressure in the 1 L tank increases All of the above None of the above Question 2 Use Charles s Law to interpret the following problem and then select the correct answer below A 250mL compressed tank is filled with Hydrogen gas and has a pressure of 100kPa If all of the Hydrogen gas is removed from the tank and pumped into a 1L tank what happens to the temperature of the gas options The temperature in the 250 mL tank decreases The temperature in the 250 mL tank increases The temperature in the 1 L tank increases All of the above

Calculate the wavelength in nm of the blue light emitted by a mercury lamp with a frequency of 6 32 x 1014 Hz Hint the speed of light 3 00 x 108 m s 190 nm 475 nm 385 nm 211 nm