General Questions and Answers

The reducing agent is reduced during the feaction O True False

The diagram below represents the bright line spectra of four elements and a bright line spectrum produced by an unidentified elemena Bright Line Spectra 600 Element L Element M Element X Element Z Unidentified Element 500 L 500 What is the unidentified element 600 Wavelength nm 700 700

We breathe in air passes through a series of passages which are in correct order the bronchl nasal passages throat windpipe Onasal passages throat windpipe bronchl Onasal passages windpipe throat bronchl Othroat windpipe bronchi nasal passages

The rusting of iron is an example of the process known as corrosion True False

Decide whether each proposed multiplication or division of measurements is possible If it is possible write the result in the last column of the table proposed multiplication or division 2 540 mm 0 060 m 3 0 g 8 0 cm 1 0 9 0 5 Is this possible 00 yes no yes no yes result 0 0 U 0 x10 B 00 3

1 How many MOLECULES of boron trifluoride are present in 3 25 moles of this compound molecules 2 How many MOLES of boron trifluoride are present in 5 02 1022 molecules of this compound moles

Questions 1 If the Erlenmeyer flask is not dry before it is heated in the boiling water bath the amount of water drawn into the flask upon cooling will be substantially greater than it should be Explain why this is the case

Which of the following elements has the largest atomic size OS O Ca O Ba O Po Rn

he compound Ba3 PO4 2 Tap on table cells to enter or edit an answer And for best results avoid early rounding and enter mass values to at least three significant digits Mass of All Atoms g mol Element Total of Atoms Ba P O Molar Mass of Compound

In the 1960s Bob Dylan composed influential counterculture music was a student protester at the University of California at Berkeley wrote the book Slaughterhouse Five Oco founded the Students for a Democratic Society

Most acids dissolve metals by the oxidation of H ions to hydrogen gas O True False

Identify the type of argument based on the information below Premise 1 Girls love flowers Premise 2 Rita loves flowers Conclusion Rita is a girl O Valid O Invalid and unsound Invalid

For the following reaction at equilibrium H PO4 H30 1 H3PO4 H O H3PO4 is the H O is the H PO4 is the H30 is the a acid b base c conjugate acid e strong f moderately strong or weak It is not on the list of strong acids and so is a It is both a very It is not on the list of strong acids and so is a It is a d conjugate base 8 weak acid and a very acid base acid because it is on the list of strong acids bas

For the following reaction 23 8 grams of sulfur dioxide are allowed to react with 5 42 grams of water sulfur dioxide g water 1 sulfurous acid H SO3 g What is the maximum amount of sulfurous acid H SO3 that can be formed What is the FORMULA for the limiting reagent What amount of the exce romning after the roactic grams

a prerequisite skill to determining the molar mass Count e number of atoms of each element in NH4 2CO3 Tap in the fields to enter the answers directly OR tap on the Number Pad icon to use our built in Number Pad Nitrogen N Hydrogen H Carbon C Oxygen O 300 3003 140C 1300 13090 180C

Electrons added to atomic orbitals of the same energy will remain unpaired with parallel spins until the subshell is more than half filled is a statement of O the aufbau principle O Hund s rule O the Pauli exclusion principle the periodic law O the singularity rule

In each she fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 5 0 C and constant total pressure Ther she measures the reaction enthalpy AH and reaction entropy AS of the first reaction and the reaction enthalpy AH and reaction free energy AG of the second reaction The results of her measurements are shown in the table Complete the table That is calculate AG for the first reaction and AS for the second Round your answer to zero decimal places Then decide whether under the conditions the engineer has set up the reaction is spontaneous the reverse reaction is spontaneous or neither forward nor reverse reaction is spontaneous because the system is at equilibrium CC g C s 2C1 8 2CH OH g 30 g 2CO g 4H O g AH 107 kJ AS 385 J K AG KJ Which is spontaneous this reaction the reverse reaction Oneither AH 1353 kJ AS s 0 2 AG 11 kJ Which is spontaneous this reaction the reverse reaction neither X

Consider the perbromate BrO4 a anion What is the central atom Enter its chemical symbol How many lone pairs are around the central atom What is the ideal angle between the bromine oxygen bonds Compared to the ideal angle you would expect the actual angle between the bromine oxygen bonds to be 0 0 choose one about the same bigger smaller

Calculate the molarity of 0 450 mol of Na S in 1 55 L of solution molarity Calculate the molarity of 26 9 g of MgS in 967 mL of solution

Which of the following elements is the least electronegative O Si O Se OS O Sc

Select the most polar bond amongst the following O O O Si F O CI F O C F O C I

Answer each of the following as either true or false trus b falco An acid is a chemical that produces H 1 or its hydrated form H30 1 in wat An acid will have at least one H in the front of its formula When an acid is put into water it makes the water act as a base HCI H O CI H O

Write the complete and net lonic equation a MgCl AgNO3

Exercise 10 00 Chanced wiul recuvack MISSED THIS Watch IWE 16 7 Read Section 16 4 You can click on the Review link to access the section in your eText Use the half reaction method to balance each redox reaction occurring in acidic aqueous solution Part A I aq NO aq 12 s NO g Express your answer as a chemical equation Identify all of the phases in your answer TE AEO ya Xb a b 121 7 a X 1 HME O 0 0 Shang X Review Constants Peri 2000

Select the element whose Lewis symbol is correct a Ga O b O C O d O 3 b Al C Br d e Al

Stoichiometry Mole Ratios a 2H O 2H O Starting w 20 mols of H how much H 0 is produced b N 3H 2NH3 If 0 6 mols of NH3 were produced how man moles of H

Select the correct electron configuration for sulfur Z 16 O 1s 1p2s 2p6 O 15 2s22p 3s23p4 O 1s 2s 2p83523p O 1s22s22p 3s23p4 O 1s 2s 2p6352304

Limiting Reactant Reagent 2 mg 0 2MgO What is the greatest amt of Mg0 mn un that can be made w 7 8 mols Mg and 4 7 mols O Limiting reactant

Select the element with the highest electron affinity i e accepts an electron most readily OH O Li OC OF O No

MISSED THIS Watch WE 16 7 Read Section 16 4 You can click on the Review link to access the section in your e Text Use the half reaction method to balance each redox reaction occurring in acidic aqueous solution CIO3 aq SO2 g Cl aq SO4 aq Express your answer as a chemical equation Identify all of the phases in your answer Submit A O 2 CIO3 aq 3SO g 3H O l CI aq 3SO A chemical reaction does not occur for this question Part C Previous Answers Request Answer X Incorrect Try Again 3 attempts remaining NO aq Cr O7 aq Cr aq NO aq Express your answer as a chemical equation Identify all of the phases in your answer AX 3 g NO 4H O

For the molecular compound carbon monoxide what would you multiply moles of CO by to get the units molecules of CO moles CO molecules CO Drag and drop your selection from the following list to complete the answer 1 mole CO 6 02 1023 moloc 23

Which of the following is a covalent compound O Na O O CaCl O Cl 0 O CSCI O Al O3

2 Calculate the number of grams of chromium in solution which is 0 1M in 100 ml of a Cr H O 6 NO3 3 5

Which of the following ions will be most likely to form when selenium ionizes Se6 O Se4 Se O Se Se4

For each molecule or ion please draw its dot structure Be sure to include all unshared pairs of electrons and name its shape Formula PF4 N O Dot structure name of shape

Which of the following elements will form a cation with a 2 charge O Si C Sr Ga Cs

Electronegativity is a measure of the energy needed to remove an electron from an atom the energy released when an electron is added to an atom the magnitude of the negative charge on an electron O the attraction by an atom for electrons in a chemical bond the magnitude of the negative charge on a molecule

1 Use the equation for the next group of questions Zn 2 HCI ZnCl H How many moles of HCI would react with 7 moles of zinc 2 How many moles of Zn would react to produce 2 3 moles of zinc chloride If 2 6 moles of zinc react how many grams of

3 The percent composition of a compound was found to be 23 1 Al 15 4 C and 61 5 O What is the empirical formula of the compound

What is the molarity M of 49 9 grams of sodium hydroxide in 0 447 liters of sodium hydroxide solution Include the correct unit symbol with your answer choice

Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table cation 4 Pb 2 Pb K 2 anion empirical formula F F F Some ionic compounds FL 0 name of compound 0 X C

1 A substance is composed of one atom of copper Cu two atoms of chromium Cr and seven atoms of oxygen O What is the percent of chromium in the substance

Elements with the highest first ionization energies are found in the table O lower left O upper left O center O lower right O upper right region of the perioc

5 In the preparation of the unknown compound 1 g of powdered charcoal was used as a catalyst for the reaction What is the purpose of a catalyst in a chemical reaction

Select the correct formula for a compound formed from barium and nitrogen O BaN O B N O BagNa O Ba N O BagN

200 L sample of gas is collected at 50 0 kPa and a temperature of 271 K What volume would this gas occupy at 100 kPa and a temperature of 14 0K 5 17 L Sind the now volum

A chemist determines by measurements that 0 0400 moles of iodine solid participate in a chemical reaction Calculate the mass of iodine solid that participates Round your answer to 3 significant digits g 0 x10 C

S A balloon contains 7 2 L of He The pressure is reduced to 2 00 atm and the balloon expands to occupy a volume of 25 1 L What was the initial pressure exerted on the balloon

A cup of whole milk contains 10 57 grams of carbohydrate 3 19 grams of fat and 6 26 grams of protein How many kilojoules does 3 cups of whole milk contain Make sure to include the correct unit symbol with the answer

wt of CoCl2 6H2O 58 9 71 108 237 95 g mol Volume of H2O2 solution 29 82 ml Wt of ammonium chloride 14 1x4 35 5 53 5 Volume of concentrated ammonia 15M NH3 I Calculations Using the equation 2CoCl2 6H2O 10 NH4OH 2NH4Cl H2O2 2 Co NH3 6 Cl3 24H 1 Using the quantities of the initial reactants establish the limiting reagent