General Questions and Answers

1 How many grams of potassium chloride are produced if 25 grams of potassium chlorate decompose KCIO3 KCI 0

18 2 points Which species have delocalized molecular orbitals select all that apply wrong choices will be penalized CC14 N 03

Match the following bonding with the correct description C H sigma bonding in C2H2 molecule C C sigma bonding in C2H4 molecule B CI sigma bonding in BC13 molecule C N sigma bonding in HCN molecule S F sigma bonding in SF6 molecule C C pi n bonding in C2H4 molecule 1 Overlap of sp hybrid orbitals on C with sp hybrid orbitals on N Overlap of 2p atomic orbitals on F with sp3d2 hybrid orbitals on S Overlap of unhybridized 2p orbitals on both Catoms Overlap of 1s atomic orbitals on H with sp hybrid orbitals on C Overlap of sp2 hybrid orbitals on C with sp2 hybrid orbitals on C Overlap of 3p atomic orbitals on Cl with sp2 hybrid orbitals on B

1 point English physicist discovered electrons from experiment using oil droplets charged by using X rays True False

6 How many moles of potassium nitrate are produced when 2 moles of potassium phosphate react with excess aluminum nitrate KNO3 AIPO4 K3PO4 AI NO3 3

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 N H bonds are polar and the molecule is polar The nitrogen atom is sp hybridized The H N H bond angles are less than 109 5 degrees The molecular geometry is tetrahedral The molecule has three T pi bonds The molecular geometry is trigonal pyramidal

4 What volume of hydrogen gas at STP is produced when 2 5 grams of zinc react with an excess of hydrochloric acid ZnCl H Zn HCI

AgNO3 is soluble in water Na3PO4 is soluble in water NaNO3 is soluble in water Ag3PO4 is NOT soluble in water When mixing AgNO3 and Na3PO4 in water what could be the solid compound forming AgNO3 Na3PO4 NaNO3

19 2 points For the given molecule determine the number of pi bonds O Eq H C C C C C C 3 HTCIH H H H

3 How many grams of silver chloride are produced from 5 0 grams of silver nitrate reacting with an excess of barium chloride AgNO3 AgCl Ba NO3 2 BaCl2

12 Consider the reaction and rate data in the table below The decomposition of HOF occurs at 25 C 2 HOF g 2 HF g O g Using the data in the table below determine the rate law and then calculate the rate constant HOF mol L 0 850 0 810 0 754 0 526 0 243 Time min 0 2 00 5 00 20 0 50 0 a Write the table needed and the axes to plot to determine whether this reaction is 1 order b Write the table needed and the axes to plot to determine whether this reaction is 2nd order

A molecule has a zero dipole moment If the formula is AX4 which of the following geometries are possible select all that apply wrong choices will be penalized Square Pyramidal T shaped Seesaw distorted tetrahedral bent Square Planar trigonal pyramidal Tetrahedral trigonal planar

5 points Which of the following statements are TRUE about SO2 molecule select all that apply wrong choices will be penalized Hint Draw Lewis structure The central atom is sulfur S The hybridization of the central atom is sp There are 3 total electron domains around the central atom The molecular geometry around the central atom is linear The molecule contains TT pi bonds The central atom is oxygen O The central atom contains one lone pair The molecule is nonpolar The angles between the bonding pairs are 180 The electron pair geometry around the central atom is trigonal planer The hybridization of the central atom is sp The electron pair geometry around the central atom is linear The angles between the bonding pairs are less than 120 The molecular geometry around the central atom is bent The molecule is polar

At an average speed of 25 miles hour how many hours will it take to travel 450 miles O 0 056 h O 450 h 25 h O 18 h

Predict the products of the reaction below That is complete the right hand side of the chemical equation Be sure your equation is balanced and contains stat symbols after every reactant and product HCl aq H O l

Ben and Jerry arch rivals decide to have a weight lifting contest during PE Ready set gol Ben and Jerry both lift a 250 kg barbell 10 times over their heads They are approximately the same height and lift the barbell the same distance in the air It takes Ben 5 seconds to complete 10 lifts it takes Jerry 25 seconds to complete his 10 lifts Which statement is MOST accurate regarding the weightlifting contest A B 9 D A B As a physical science demonstration Jack and Jill ran up the hill at the football stadium Jack is twice as massive as Jill but Jill runs the same distance in half the time 9 Compare the work done and power of Jack and Jill D Ben did more work than Jerry Ben has more power than Jerry A Ben and Jerry have the same power B Ben does more work and is more powerful than Jerry C Jack did more work than Jill but Jill has more power Jill did more work than Jack but Jack had more power Jack did more work than Jill but Jill has as much power as Jack Jack and Jill did the same amount of work but Jack had more power Students performed a stair climbing experiment to investigate the power output of the human body Each student climbed a set of stairs while another student used a stopwatch to time the climb The body mass time and vertical height reached by four students is given in the table Estimate g as 10 m s Which student generated the GREATEST amount of power in the experiment Armena Data Table 1 Power Student Mass kg Time s Vertical height m O Neill 16 6 0 12 6 0 17 6 0 13 6 0 Franklin 70 Mari 55 Franklin 80 Armena 65 Mari

Exactly 150 coins have a mass of 0 998 lb What is the mass of exactly 15 coins in grams Use 1 kg 2 20 lb 45 g 34 g 150 g

Students performed a stair climbing experiment to investigate the power output of the human body Each student climbed the stairs in a sports stadium to different heights while another student used a stopwatch to time the climb The body mass time and vertical height reached by four students is given in the table Estimate g as 10 m s Which two students generated the same amount of power A B C Toshiko and Gwynn Data Table 3 Power Student Mass kg Time s Vertical Height m Johanna 56 11 2 Gwyn 62 16 0 Rydell 74 22 2 Toshiko 58 14 5 Gwynn and Johanna Rydell and Toshiko 8 0 8 0 12 0 12 0

How many Al C and O atoms are there in 2 molecules of Al2 CO3 3 O4 Al atoms 6 Catoms 18 O atoms 2 Al atoms 3 Catoms 9 O atoms 2 Al atoms 3 Catoms 60 atoms 4 Al atoms 6 Catoms

Fill in the information missing from this table nuclide 65 29 Cu C protons 0 49 neutrons 2 66 0 0 0 A 16 32 20 x S

A bar of a mysterious element with a volume of 34 0 mL contains 2 31 mol of that element What is its density in g mL The molar mass of the element is believed to be 235 g mol 11 9 g mL 16 0 g mL O6 91 g mL 0 00679 g ml

Multiply and simplify Your answers must include a number unit and formula 3 mol O 5 1 g Al O3 1 mol Al O 102 g Al O 2 mol Al 0 0 075 0 075 mol O 0 075 mol 0 075 0

According to the following chemical equation how many Fe atoms are needed to form 4 particles of Fe O3 4 Fe 3 0 2 Fe O3 2 Fe atoms 1 Fe atom 8 Fe atoms 4 Fe atom

Write the standard formula for the following ion combinations unbalanced CrO2 K O CrO k OK CrO4 CrO4K

O will only occur if the collision has the correct amount of energy and impact is at the right angle and location Describe how collision theory helps predict how temperature pressure and concentration impact reaction rates Consider a reaction between two gaseous reactants 4 mol of A and 4 mol of B in the closed flasks shown below Assume that the two reactions are both at room temperature Which reaction will occur faster A 250 mL flask 54 F Cloudy 1 54 PM 5 3 2022

Burning ammonia can result in the formation of water and elemental nitrogen 4 NH3 3 O2 2 N 6H O How many moles of O2 must be used up if 20 0 mol N form O 10 moles 0 O20 moles 02 300 moles 0 30 moles 0

Which of the following ionic compounds is are soluble in water II K3PO4 III Fe NO3 3 1 NaCl All are soluble Only II Only I Only III

A 200 0 gram solution contains 4 0 grams of NaOH What is the percent NaOH in the solution 4 0 100 200

According to the following balanced reaction how many moles of O are needed to burn 5 0 moles of P4 P4 5O2 P4010 10 moles 02 20 moles O 25 moles O2 5 moles Ob

How many acidic hydrogens are there in this compound KHC8H4O4 04 None 5 01 Previous

Describe the following trends in the Periodic Table Be precise in your answer E g across can mean left to right or right to left Make sure that it is clear what you mean How does the atomic diameter change across a period from left to right

According to the following neutralization reaction how many mL of 0 050 M NaOH will neutralize 25 0 mL of 0 20 M HCI HCI NaOH NaCl H O 100 mL 50 0 mL 5 00 mL 10 0 mL

Quantum Numbers Identify the subshell in which electrons with the following quantum numbers are found n 2 1 1

Periodic Properties Which element has the greatest electron affinity

Rank the elements or compounds in the table below in decreasing order of their boiling points That is choose 1 next to the substance with the highest boiling point choose 2 next to the substance with the next highest boiling point and so on substance A B C D chemical symbol chemical formula or Lewis structure H 0 HIC H Co HIC H HIC H boiling point Choose one 1 highest 2 3 4 lowest Choose one O Choose one 8

e d 1 Calculate AH for the following reactions using the heats of formation remember all diatomics and single elements are 0 kJ mol a 8Al s 3Fe3O4 s 4Al2O3 s 9Fe s b CO g O2 g c C2H2 g H2 g C2H4 g CO2 g NH3 g O2 g NO g H O g KCl 0 KCIO

4 1 point Dutch scientist Johannes van der Waals improved the ideal law by account of real molecules have actual volume and attractions to each other True False

Simplify the following unit cal g C O cal cal 1 1 g 0 C C

Which air parcel will rise higher Explain what happens as it rises higher in the troposphere Use your key concepts Air Parcel 2 Surrounding Air 5 C 8 9 10 11 Air Parcel 1 Surrounding Air 5 C Air Parcel 40 C Air Parcel 1 Surrounding Air 15 Air Parcel 45 c Air Parcel 1 Surrounding Air 4 C Air Parcel 4 C Air Parcel 1 Surrounding Air 7 C Air Parcel 10 C Air Parcel 10 C Air Parcel 2 Surrounding Air 15 Air Parcel 15 C Air Parcel 2 Surrounding Air 4 C Air Parcel 35 C Air Parcel 2 Surrounding Air 7 C Air Parcel 30 C

2 The endocrine system is one of the two systems responsible for communicatio with the body and integration between various body tissues as well as the system A Digestive system B Muscular system C Nervous system D Skeletal system

One reason we cannot use pure ethanol in engines is its low vapor pressure Considering the reactants in the combustion reaction below why is this a problem 2CH3CH OH g 602 g 4CO2 g 6H O g

de whether each chemical reaction in the table below is an oxidation reduction redox reaction If the reaction is a redox reaction write down the formula he reducing agent and the formula of the oxidizing agent 30 g 4Fe s 2Fe O3 s 2N g 50 g 2N O5 8 2Fe s 3NiCL aq 2FeCl aq 3Ni s redox reaction yes reducing agent oxidizing agent redox reaction O yes reducing agent oxidizing agent O yes O no redox reaction reducing agent oxidizing agent O no O no X

What is the pH of an acidic solution that has a hydrogen ion concentration of 2 3 x 10 M 11 4 O 11 2 6 3

How many grams of NaOH are needed to make a 250 0 mL or a 4 2 M NaOH solution O 1050 grams NaOH 42 grams NaOH 1 05 grams NaOH 42 000 grams NaOH

How many moles of HCI are in 10 L of a 0 5 M solution

If the pressure is doubles and the temperature is held constant what will happen to the volume of a gas Reduced by a Fourth Doubled Quadrupled Reduced by Half

5 True or false When the thyroid levels are too high they suppress the secretion of TSH and THR consequently inhibiting their own production A True B False

1 4 points Recall the steps of the experimental procedure Classify the following processes as physical or chemical a Mashing strawberries breaking cell walls b Dissolving phospholipid layer of cell membrane with a dish detergent c Extracting DNA strands into the cold alcohol c Spooling DNA strands

0 75 moles of LiF are dissolved in 65mL of solution What is the molarity of the solution

5 Why do all cells have a cell membrane What are the functions of this membrane