General Questions and Answers

1 1 point How many grams of H O are required to produce 250 0 g of PH3 in the reaction below Ca3P2 6H O 3 Ca OH 2 2 PH3 54 8 g 132 g 110 g 397 g

In the reaction below how many grams of phosphorus can be produced from 135 g of lithium phosphide 4 Li3P 3 02 6 Li O P4 81g 20 g 324 40 g

A pictorial representation of an electronic configuration is shown TL TL TL TJ TJ TL TJ TL TL TL TL TL TL TJ TL T T 3p 4s 10 28 3s 3d 4p Give the full electron configuration Do not use the noble gas electron configuration abbreviation Name the element assuming that the configuration describes a neutral atom

Use the bond energies given to calculate the enthalpy of this reaction 2 H C 0 H C O Bond Type O O C O C N HICIH O H C H Relevant Bond Energies Bond Energy kJ mol 743 498 358 305 467 413 20 c o H

POSSIBLE POINTS 9 Please fill in the blanks in the image below with the proper way of setting up a balancing problem if you follow my procedure there is only one correct way of setting up this type of problem You do not need to balance this problem Note that not all of the responses will be used at all while others may be used more than once C H O 0 H 0 C 1 0 2 3 4 5 CO 6 7 8 9 10 H O M N 53

5 What is the period for obtaining water rights by adverse use in Utah O a 20 years O b 5 years c Water cannot be obtained by adverse use in Utah d 7 years

1 Find the oxidation number of the indicated element in the following molecules and ions 6 pl Any work shown will be taken into consideration when assigning partial credit a Cr O7 Cr b C H6O C long the following half reaction in acidic solution and then classify as oxidation or reduction 8 pts

Property Atomic symbol Additional name s atomic composition most stable isotope Additional isotopes with nuclear composition and natural abundances by Molar mass State of matter at room temperature Color and texture Melting point Boiling point Density Classification on the periodic table Electron configuration full and noble gas configuration Atomic radius First ionization energy Common ions if appropriate Names and formulas of three compounds containing the element Other special properties

1 point O O O O The molar mass of an unknown compound is 560 g A sample of the compound consists of 0 900 g of carbon 0 0751 g of hydrogen 0 175 g of nitrogen and g of oxygen What is the the empirical formula of this compound C12H14N3O5 C H NO3 C24H24N4012 C24H28N6010

7 1 point Bacon cooks in a skillet Is this an endothermic or exothermic process Exothermic Endothermic O

The pressure 70 0 m under water is 788 kPa What is this pressure in atmospheres atm P What is this pressure in millimeters of mercury mmHg

Give the number of protons neutrons and electrons for 365 2 protons neutrons electrons

Complete the balanced neutralization equation for the reaction below H SO4 aq Ca OH aq

A chemist dissolves 558 mg of pure hydroiodic acid in enough water to make up 130 mL of solution Calculate the pH of the solution Round your answer to 3 significant decimal places 0 0 x10 X C do

Very Reactive Li K Bo Co Na Mg Al O PbPO3 O Pb4 PO3 2 C Fe Ni Sn Pb Hg Ag Au Very tinneactive Pt O Pb3 PO3 4 H Cu O No reaction occurs Lithium Potassium Barium Calcium Sodium Magnesium Aluminum Corban Zinc Iran Nickel Tin Leod Hydrogen Copper Mercury Silver Gold Platinum Reacts with Oxygen Reacts with Dilute Acids Carbon dreje tutore ched f r denneE Reacts with Water FOT Extraction by Electrolysis Expensive Extraction by fluorine chlorine Metal Oxide Reduction with Carbon or CO Inexpensive Nonmetal Activity Series Which of the following compounds could be produced if lead was combined with Cu3PO3 in a single replacement reaction oxygen or hydroxide bromine lodine POSSIBL

ball stick Submit Answer his case sensitive so capitalize only the D or L labels bail stick tabels Try Another Version 4 item attempts remaining propriate the configuration of the anomeric carbon

The reaction below is at equilibrium What would happen if more Na2O2 were added 2Na s O g Na O s A The equilibrium position would shift to produce more 02 B The equilibrium position would shift to produce more Na202 C The equilibrium position would shift to produce more Na2 and 02 D The equilibrium position would stay the same

3 Solid sodium carbonate Na CO3 reacts with according to the following equation Na CO3 s H SO4 aq CO g H O 0 Na SO4 aq During an experiment to produce carbon dic following data P CO 708 1 mm Hg V CO 29 65 mL T CO 25 5 C What mass of CO was produced

How many moles of C are in 1 0 x 1020 molecules of CsHs

4 1 point Light from the sun moving toward the Earth Does this have more kinetic or potential energy potential kinetic

3 1 point How many grams of C H6 would contain 3 53 1024 atoms 88 grams 176 grams 22 grams 44 grams Previous

1 point How many grams of Ca3P2 are required to produce 250 0 g of Ca OH 2 in the reaction below Ca3P2 6H O 3 Ca OH 2 2 PH3 205 g 103 g 410 g 307 g

Express your understanding of the conversions between particles moles and mass by completing the following table A B C E Formula Molar Mass g mol 46 0 NO NO H O D CaCl2 Tap on a table cell to enter or edit its value Tap on the CF Conversion Factor button for a Hint free of charge H O 46 0 18 0 111 0 18 0 of Particles 6 02 x 1023 6 02 x 1024 x10 x10 x10 CF CF CF CF CF of Moles 2 00 3 00 CF CF CF CF CF Mass grams 27 75 Student Name 14979 stu mps al org Level Apprentice Health 100 Tap for Question Specific Help

Neutral No answer text provided reduction Oxidation 2Br Br Above reaction is

A 25 0 mL solution of HNO is neutralized with 12 5 mL of 0 250 M Ba OH 2 What is the concentration of the original HNO3 solution

Calculate DU of a gas for a process in which the gas absorbs 22 J of heat and does 32 J of work by expanding YOU MUST WRITE ALL CALCULATIONS OTHERWISE YOU WILL NO BE GRANTED FULL CREDIT 54 J 10 J 54 J O 0 because DU is a state function 10 J

Using the balanced equation answer the following questions Show your work 3 Fe 2 78m01 1 How many moles of Fe are formed when 50 grams of Al react with iron II carbonate mass of Al mm of Al 2 Al 3 FeCO3Al2 CO3 3 50g Al mol of AG 1 25 98154 g mol 50g 600 g FeCO3 1 2 How many moles of Al react to completion with 600 grams of FeCO3 26 98154 g mol mol of A1 1 85312 mol 32x1 85312md 2 77368 1 mol Al gives 3 2 md Fe mol Fe 55 85 19 01 3 x 16 115 86 g mol mol 600g mol Al 3x5 173 96 4 115 86 g mol mol 5 179 mol 3 How many grams of Fe are formed when 200 g of FeCO3 react 200 g FeCO3 x1 7262 200 115 86 g mol 1 7262 mol 33x molar mass of Fe SS 85 g mo 4 How many grams of Al2 CO3 3 are formed when 300 g of Al react with iron II carbonate 7 How many grams of FeCO3 reacted to form 10 g Al2 CO3 3 10 g Al CO3 3 g Fe 5 How many moles of Al2 CO3 3 are formed when 300 g of Al react with iron II carbonate 8 How many grams of Fe are formed if 10 g Al CO3 3 are formed 31452667 6 How many moles of Fe will be formed if 200 moles of FeCO3 react with aluminum 200 mol FeCO3 Fe mol Fe SS SS X1 7 96 4043 g FeCO3

eaction Predict the formulae of the two products of the reaction ap to select or deselect answer K NO3 2 and Pbl2 OKPb and I NO3 2 O K Pb and INO3 O K NO3 2 and Pbl O KNO3 and Pbl2

The first ionzation energy generally increases from left to right across a period However there are some exceptions to this trend For example boron has a smaller ionization energy than beryllium even though it lies to the right of it in the same period Select the statement that explains this exception to the trend in ionization energy Boron has an electron in a 2p orbital which is higher in energy than the 2s orbital Consequently it is easier to remove an electron from the 2p orbital in boron than from the 2s orbital in beryllium Boron has an electron in a 2p orbital whereas beryllium only has electrons in the 2s orbital Both 2s electrons must be removed at the same time so it takes less energy to remove the one electron from the 2p orbital in boron than to remove both electrons from the 2s orbital in beryllium O Beryllium has a noble gas electron configuration whereas boron is one electron away from achieving a noble gas configuration Consequently it takes much less energy to remove one electron from boron and achieve a noble gast configuration than it does to remove an electron from beryllium which is already in a noble gas configuration The 2p electron in boron experience a greater effective nuclear charge than the 2s electrons in beryllium meaning it is easier to remove the 2p electron from boron than it is to remove a 2x electron from beryllium Another exception occurs between nitrogen and oxygen Oxygen has a smaller ionization energy than nitrogen even though it lies to the right of it in the same period Select the statement that explains this exception to the trend in ionization energy O Oxygen has one more electron than nitrogen in its outer shell This extra electron decreases the shielding of the other electrons in the outer shell and makes it easier to remove an electron from oxygen O An electron is removed from the 2s orbital in oxygen whereas an electron is removed from the 2p orbitals in nitrogen It is easier to remove a 2s electron than a 2p electron Nitrogen has three unpaired electrons in the 2p orbitals whereas oxygen has two unpaired electrons and two paired electrons in the 2p orbitals The repulsion between the paired 2p electrons in oxygen increases their energy making one of them easier to remove O Nitrogen has three unpaired electrons in the 2p orbitals whereas oxygen has two unpaired electrons and two paired electrons in the 2p orbitals When an electron is removed from nitrogen it causes the remaining two 2p electrons to pair The combined energy of these two processes is greater than the energy needed to remove a 2p electron from oxygen

Classify each element as a metal a semimetal or a nonmetal Metal Semimetal metalloid Nonmen

2 The doctor orders penicillin V potassium oral suspension 56 mg kg day in four divided doses for a patient who weighs 55 lb The suspension that is available is penicillin V potassium 125mg 5 ml What volume in ml should you administer for each dose Report answers with appropriate decimal places for professionals to dispense

ma What functional group is highlighted in this section of an unknown drug H The highlighted functional group is a ket

below the bala equation to fill in the blanks of the table A B CDE N 3H 2 NH3 Tap on a table cell to enter or edit its value moles of H moles of N 1 0 4 8 1 5 6 0 moles of grams of NH3 NH3 2 0 Color Coding Key 170 0

ow many grams of fluorine are required to produce 20 0 grams of FeF3 from the reaction show 2 Fe 3F 2 FeF3

If 84 5 mol of an ideal gas occupies 28 5 L at 79 00 C what is the pressure of the gas P atm

A sealed container holding 0 0255 L of an ideal gas at 0 987 atm and 65 C is placed into a refrigerator and cooled to 39 C with no change in volume Calculate the final pressure of the gas P

A chemist dissolves 701 mg of pure barium hydroxide in enough water to make up 150 mL of solution Calculate the pH of the solution The the solution is 25 C Round your answer to 3 significant decimal places 0 0x10 C

In covalent bonding the electrons are Oshared between all atoms in the substance O exchanged to form a bond between to ions O shared to form a bond between two atoms

The sentence below is a word equation that describes a chemical reaction Write the balanced chemical equation for this reaction Step 2 Nitrogen reacts with oxygen to form nitrogen dioxide Complete the skeleton equation Now identify the proper formulae of reactants and products Tap on the grey boxes to toggle through the options for the various formulae

NaOH aq CaCl aq Ca OH 2 s NaCl aq Which of the following show the above equation correctly balanced O NaOH aq CaCl2 aq Ca OH 2 s NaCl aq O 3 NaOH aq 2 CaCl2 aq 2 Ca OH 2 3 3 NaCl aq O 3 NaOH aq CaCl2 aq Ca OH 2 s 3 NaCl aq O 2 NaOH aq CaCl2 aq Ca OH 2 s 2 NaCl aq

Tap to select or deselect answer O Cu and Al2 SO4 3 Cu and Al4 SO 3 O Cu and Al2 SO4 3 Cu and AISO4 Al2Cu3 and SO2

ap to select or deselect answer KPb and I NO3 2 O K NO3 2 and Pbl K Pb and INO3 KNO3 and Pbl2 K NO3 2 and Pbl2

4 A propane tank inspector detected rust in a tank The empty cylinder valve was not closed and water vapor settled inside causing rust to form The cylinder is unusable Select the combination reaction for the formation of rust A Fe O3 2Fe O B 4Fe 30 2Fe O3 C FeCl H O FeO 2HCI D Fe O3 3CO 2Fe 3CO

The molar volume of any gas at conditions of standard temperature and pressure is 22 4 liters True False

3 Complete each ionization reaction and then identify the conjugate acid base pair from that ionization reaction Note that each ionization reaction contains two conjugate acid base pairs these drop downs are looking for the conjugate acid base pair that does not involve water a b C d Reactants HBr aq H O 1 HCIO4 aq H O 1 NH3 aq H O 1 H CO3 aq H O 1 Choose Choose Choose Choose Choose Choose Choose Choose Products Conjugate Acid Choose Choose Choose Choose Choose Choose Choose Choose 1 Table view Conjugate Base Choose Choose Choose Choose Choose Choose List view Choose Choose Y

A 3 05 g sample of a compound consisting of carbon hydrogen oxygen nitrogen and sulfur was combusted in excess oxygen This produced 3 30 g CO and 1 80 g H O A second sample of this compound with a mass of 5 49 g produced 3 60 g SO A third sample of this compound with a mass of 7 17 g produced 3 70 g HNO3 Determine the empirical formula of the compound Enter the correct subscripts on the given chemical formula empirical formula CHNSO

Classify the substances as a pure substance a heterogeneous mixture or a homogeneous Pure substance table salt tin silver Heterogeneous mixture soil oatmeal Homogeneous mixture balsamic vinaigrette seawater cranberry juice

eaction Tap to select or deselect answer O Cu Na and PO4OH O Cu3PO4 and Na OH 2 O CuNa2 and PO4 OH 3 O Cu PO4 and NaOH Cu3 PO4 2 and NaOH

What is the average bond order in the preferred Lewis structure of the polyatomic anion with a charge of 2 formed from a sulfur atom and three Say oxygen atoms Use a number for the bond order

e enantiomers optical isomers 4 What is the product of the following reduction reaction a d OH OH b H c H OH