General Questions and Answers

First Solution Second Solution Mixture Needed Doreen Schmidt is a chemist She needs to prepare 36 ounces of a 10 hydrochloric acid solution Find the amount of 18 solution and the amount of 9 solution she should mix to get this solution Concentration Ounces of Solution Ounces of Pure Acid rate 9 0 09x 18 0 18y 10 0 1 36 ounces X How many ounces of the 18 acid solution should be in the mixture y 36 ounces How many ounces of the 9 acid solution should be in the mixture Ws 10 point s possible This question 1 point s possible

Read the following quote and choose the correct answer Terry Brooks wrote Who would you be but who you are This quote can be best described as O Individualism O transcendentalism O romanticism Onaturalism

Metal chlorates MCIO3 decompose in metal chlorides and Select Metal carbonates MCO3 decompose into metal oxides and Select

In a Heating and Cooling Curve what is occurring during the flat portions of the curve when the temperature is constant and what is the energy being used to do Othere is no energy being added it is speeding up the particles it is changing the phase O it is increasing the kenetic energy it is decreasing the kinetic energy

Imagine a small amount of each compound in the table below is dissolved in water Pick the sketch that best shows what the solution would look like at the atomic level The large number of faint red and white molecules in the background of each sketch represent the water solvent Also the colors of the solute atoms may not mean the same element in each sketch For example solute oxygen atoms could be colored yellow in the first sketch but blue in the second Chlorine atoms could be colored blue in the first sketch but yellow in the second And so on Note for advanced students the sizes of the atoms and any bond angles may not be accurate compound NaNO3 CHC13 pick a sketch Drag the slider to choose an image 4 5 6 7 Drag the slider to choose an image 8 1 7 8 X

Homework Unit 7 MATH 0307 14 4 1 solving word problems u HW Score 83 33 5 of 6 points O Points 0 of 1 Gabe Amodeo a nuclear physicist needs 90 liters of a 50 acid solution He currently has a 30 solution and a 60 solution How many liters of each does he need to make the needed 90 liters of 50 acid solution Question 6 4 5 45 Part 1 of 2 Gabe needs liters of the 30 solution Sav

A Group 2 metal with an electron configuration of Ne 3s2 combines with fluorine F to produce a compound In g mol what is the molar mass of the product Round to the nearest tenth

Question 13 Points 1 What alias did Hester s husband take O Roger Prynne Roger Chillingworth O Roger Hamilton Roger Hester

Which of the following option best explains the struggle between human beings and nature Humans are powerless compared to the power of nature Humans have the power to control the entire world while nature cannot Humans can control the destructive power of nature by making effective use of technology None of the choices

8828 3 1 A mole of Pennies would fill up how muny FC41354TO000 0ded to come trurna mn Bierbilt ninw est do but did by 0 1 VALM Fa Cup 12 oz

Question 3 Points 3 Read the excerpt from The Scarlet Letter and answer the question that follows The narration is about Chillingworth the husband of Hester Prynne When he found the eyes of Hester Prynne fastened on his own and saw that she appeared to recognize him he slowly and calmly raised his finger made a gesture with it in the air and laid it on his lips What can be inferred from the given lines Hester Prynne and Chillingworth have legally separated O Chillingworth expresses his anger on Hester Prynne for her adultery Chillingworth gestures to a man in the crowd to punish Hester for her adultery Hester identifies Chillingworth in the crowd and abides by his command

Potential energy diagram Potential energy D A B Reaction coordinate Time Remaining 22 3 points Which letter represents the transition state activated complex 00000 23 4 points Which letter represents the activation energy 00000 EU D 24 DABEC 4 points Which letter represents the enthalpy Sub

Listen Rank the following ions in order of increasing nitrogen oxygen bond lengths NO NO NO3

Aqueous aluminum bromide and solid zinc are produced by the reaction of solid aluminum and aqueous zinc bromide Write a balanced chemical equation for this reaction AI s Zn Br aq Zn s AIBr 4

Listen Which diagram below shows the correct orientation of the dipole in sulfur dioxide 0 4 Onone of these

Classify each chemical reaction 2CH CH CH g 13O g 8CO g 10H O g KOH aq HCIO4 aq t reaction Ca s Cl g CaCl s KCIO4 aq H O 1 Na S aq FeCl aq 2NaCl aq FeS s type of reaction check all that apply combination O single replacement double replacement decomposition combination O single replacement Odouble replacement Odecomposition combination single replacement O double replacement Odecomposition combination single replacement double replacement decomposition Oprecipitation combustion acid base Oprecipitation combustion acid base Oprecipitation combustion acid base precipitation combustion acid base

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 e Text Part A According to the quantum mechanical model for the hydrogen atom which of the following electron transitions would produce light with the longer wavelength 3p2s or 4p2 Match the items in the left column to the appropriate blanks in the sentences on the right shorter 4p2s increases longer decreases According to the quantum mechanical model as the quantum number n increases the energy and the spacing between the energy levels Therefore the transion would have a greater energy difference than the transition Lower energy is associated with would produce a longer wavelength Reset Help wavelengths thus the transition

The truth was that the little Puritans being of the most intolerant brood that ever lived had got a vague idea of something outlandish unearthly or at variance with ordinary fashions in the mother and child and therefore scorned them in their hearts and not infrequently reviled them with their tongues What does the phrase being of the most intolerant brood that ever lived mean The phrase denotes Hester and her adultery Therefore society terms as the most intolerant brood O The phrase denotes Pearl as she is considered outlandish because of her mother s adultery The phrase denotes the Puritans who focus on the highly moral world which many people consider outlandish O The phrase denotes clergymen who were imposing strict rules an people in society

Use the distributive property to remove the parentheses 9 5w 3u 4

Potential energy diagram Potential energy A B E Reaction coordinate 20 3 points Which letter represents the reactant 00000 21 EUBAD 3 points Which letter represents the product 0000 A E B D

he would serve de god ground Cocper a foundies elec dentity of the Paredes of static lectricity 8 or current electricity C by arching the 388888 lightning strikes saran wrap on a bowl use of a battery clinging clothes in a dryer generator wall outlet List the 4 parts of a circuit Which one 1 LAC 2 Cuire 3 4 DC Switch provides the electrical energy Changes the electrical energy to other energy forms Starts stops the flow of electrons Provides a pathway for the electrons Which method of connection is used to connect What are the two methods of connecting up equipment in an electric circuit 1 2 i an ammeter ii a voltmeter

What phase transition is present at point B on the heating curve below OOO Temperature C 250 200 150 100 50 0 50 100 150 Sublimation Melting Vaporization Condensation Heating Curve A B Heating C D E

5 points Using this data 2NO g Cl g 2NOCI g 2NO2 g 2NO g O g Kc 16 3 9 Kc 3 63 x 10 3 calculate a value for Ke for the reaction NOCI g 1 2O g NO g Cl g Keep the answer with 2 decimal places

Which of the following evolves O An individual cell An individual organism O A population A single genotype

Pb Cr2O7 2 Spell out the full name of the compound TIN

During the Industrial Age what was the main method that businesses used to inform consumers about new inve they could purchase the multiplex the telephone the telegraph advertisements

20 After a project is complete and the notice of completion is issued how long do subcontractors suppliers and laborers have to pursue their lien rights a 4 years b 7 years c 90 days d 20 days

Write the electron configuration of an atom of the element highlighted in this outline of the Periodic Table 1 2 3 4 5 6 7 Hint you do not need to know the name or symbol of the highlighted element 0 222285 He Ne Ar Kr Xe Rn

632 8 nm wavelength of red light from a helium neon laser Express your answer using three significant figures VAE n Submit Part B Request Answer BRAC 12 24 cm wavelength of a microwave oven Express your answer using three significant figures 8 1

A circuit that has a green LED connected to pin PC7 and a red LED connected to pin PC6 of the AVR ATmega16 microcontroller Write a program to control the LEDs so that they will blink in sequence with a 300 ms total delay time for every blink Then they will blink at the same time on and off five times with one second total delay time for every blink Program port c in a way 4 bits are output and 4 bits are input

Read the following line from The Tell Tale Heart True nervous very very dreadfully nervous I had been and am but why will you say that I am mad Why does the narrator repeat the word nervous O To create tension O to prove the narrator is not mad O To compare two things O To go beyond the literal meaning of words

Section 2 2 You can click on the Review nk to access the section in your e Text The distance from the sun to Earth is 1 496 x 108 km Part A How long does it take light to travel from the sun to Earth Express your answer to three significant figures in seconds View Available Hint s Hint 1 Convert the distance to meters OF V AE

SiB6 Spell out the full name of the compound View Available Hint s

in the table below you will find three descriptions of scientists engaging in activities that are part of the scientific method What are the missing words description missing word Benjamin is supervising the boring of cannon in a foundry and makes the that the steady friction of the drill on the metal causes the metal to heat up He measures the temperature change with a thermometer James sets up an in which he will carefully stir the water in an insulated container keeping track of the force required to stir the water and then measure any temperature rise in the water He hopes to find out whether the energy of stirring can be transformed into heat Sadi proposes the that substances become hot when rubbed because the pressure of the rubbing squeezes out a fiery bright substance he calls caloric 0 1 X

BaBr2 Spell out the full name of the compound View Available Hint s

mechanism A reaction has the following proposed mechanism A g B s A B s fast A B s A g AB s slow AB s C g AC g B s fast A g C g AC g fast 1 4 points The species B is properly described as a heterogeneous catalyst 0000 homogeneous catalyst an intermediate an activated complex all genction

A chemist prepares a solution of zinc nitrate Zn NO3 2 by measuring out 2 1 10 mol of zinc nitrate into a 250 mL volumetric flask and filling the flask to the mark with water Calculate the concentration in mol L of the chemist s zinc nitrate solution Round your answer to 2 significant digits mol L O x10

How many valence electrons are in the bisulfate ion HSO4 1 6 C

337 1 nm wavelength of a nitrogen laser Express your answer using three significant figures E3 VAEO J

Ni CH3CO2 2 K S NIS KCH3CO2 1 The above reaction between nickel II acetate and potassium sulfide produces nickel II sulfide and potassium acetate Balance the reaction What is the coefficient in front of potassium acetate KCH3CO once balanced

0 9301 g sample of a compound known to contain C H and O was burned in oxygen to yield 1 729 g of CO and 0 3535 g c H O CxH O 0 CO 2 7707 H O 1 What is the empirical formula 2 What is the molecular formula of the compound if the molar mass of compound is 142 g mol

Here are four sketches of pure substances Each sketch is drawn as if a sample of the substance were under a microscope so powerful that individual atoms could be seen Decide whether each sketch shows a pure sample of an element or a pure sample of a compound Substance A element O compound Substance C O element Substance B O element O compound Substance D O element

Consider the reaction 2 A g B g K 2 70 x 10 5 at 500 K If a sample of A g at 4 90 atm is heated to 500 K what is the pressure of B g at equilibrium PB atm

Some substances have the same chemical composition but their atoms are arranged differently A classic example is carbon A pencil lead is made of graphite which contains only carbon atoms A diamond also contains only carbon atoms However the carbon atoms in a diamond are packed more closely together Would you expect the density of graphite and a diamond to be the same Explain your answer

7 How long must someone possess property in order to successfully claim adverse possession O a 4 years b 5 years c 7 years d 20 years

Give an example of a solid solid solution

Spell out the full name of the compound Submit Part E CsCl Spell out the full name of the compound Submit Request Answer Part F Request Answer

Weight of acetanilide used Weight of purified acetanilide obtained Melting point of purified acetanilide Your task 1 Calculate the yield 2 What does the recorded melting point tell you about the purity of the acetanilide 3 What is the melting point of the impure acetanilide expected to be 14 Does rate of cooling of the heated acetanilde solution affect the purity of the product obtain Explain why or why not 5 What properties are required of a good solvent for recrystallizing a compound 6 Could hexane a non polar solvent be used instead of water in this experiment Explain reason for your answer 7 The structure of acetanilde is shown below Use ARIO to Rank the relative acidities of three typ of Hydrogen consider all the Hs on aromatic ring to be same type and acidity Explain t reason s underling your ranking

Express your answer as a chemical formula View Available Hint s 0 Submit A O DA chemical reaction does not occur for this question Part D beryllium and iodine Express your answer as a chemical formula View Available Hint s

Spell out the full name of the compound View Available Hint s Submit Part B CrS Spell out the full name of the compound View Available Hint s Submit Part C