General Questions and Answers

1 In a brief paragraph summarize how the greenhouse gasses have affected earth s atmosphere during the Ice Age the year 1750 and Today

Question 11 Calculate the molar concentration of the following solutions 450 0 mL of a aqueous solution containing 66 5 g Ba OH 2 Question 12 wired to make the following aqueous solutic

For the following reaction 21 4 grams of sodium chloride are allowed to react with 53 2 grams of silver nitrate sodium chloride aq silver nitrate aq silver chloride s sodium nitrate aq What is the maximum amount of silver chloride that can be formed What is the FORMULA for the limiting reagent What amount of the excess reagent remains after the reaction is complete grams grams

8 How has the concentration of greenhouse gasses changed from the ice ages to the 1750 s How much has the average temperature risen as a result of these additional greenhouse gasses

Draw the Lewis structure of CH NH and then choose the appropriate pair of ybridization states for the two central atoms Your answer choice is independen of the orientation of your drawn structure 0 A sp sp B sp sp C sp sp D sp sp E sp sp

Question 2 Calculate the number of moles 7 94 grams of potassium bromide Question 3 Calculate the mass weight

Question 5 Calculate the mass weight 0 77 mol ammonium chloride Question 6

100 mL of a solution containing 23 0 g potassium sulfate in H O Question 20 anant Posted R 4449 quired to make the following aqueous solution

18 A helium balloon with a volume of 5 0 L and a pressure of 105 kPa at 25 C floats up high in the sky where the pressure is 850 mm Hg and the temperature is 15 C What is the new volume of the balloon OA 0 53 L OB 2 8 L O C 0 25 L OD 4 0 L

A Moving to the next question prevents changes to this answer Question 9 If you dissolve 84 9 g of CaBr2 in water to make a 2 10 1 solution what concentration of KBr will the produced solution have 1

The mercury 201 nuclide radioactively decays by electron capture Write a balanced nuclear chemical equation that describes this process 0 0 X 3 Y

How many grams of solute are in 2000 mL of a 5 00 ppm solution The concentration will always be the conversion factor Like m m ppm and related concentrations are in g ml 5 00 ppm means 5 00 g in a million mL or 5 00 g 106 mL or 5 00 g mL x 106 a 0 00 i 10 00 r 10 6 aa 20 0 b 1 00 J 2000 S 10 9 bb 40 0 mL c 2 00 k 10 t 10 12 d 3 00 I 10 u 108 CC 1 33 e 4 00 m 106 V 10 1 dd 0 267 g mL n 10 1 00 x f 5 00 w 101 0 10 2 x 30 0 g 6 00 P 10 y 0 100 h 8 00 9 10 3 z 0 200 g

How has the borrowing power of Congress led to more controversy in recent decades O The ability to borrow money has led to deficit spending The ability to borrow money has led to excessive Congressional spending on travel The ability to borrow has ruined the economy The ability to borrow has lowered the public debt

Two students plan and carry out an investigation to determine if ionic or covalent bonds have stronger intermolecular forces they use salt and sugar They collect the following data Sugar covalent white rough small grains Color soluble melts easily Which of the following tests will most help them to infer the strength of intermolecular forces between ionic and covalent compounds Texture grain size Melting point Solubility in water Sait lonic white rough very small grains soluble does not melt

How many equivalents in are in 2 00 1 of a 5 00 M solution of Na2SO4 First we need the equation for dissolving the salt Na2SO4 2 Na SO4 An equivalent is a mole of charges either or but not both they are not added the conversion factor is 1 mol First calculate the moles L Then convert into equivalents eq mol 1 00 x m

Al CUC a 1 pt Balance the equation above b 2 pts If the reaction starts with 2 1 moles of Al how many moles of CuCl will be produced show work using dimensional analysis Cu AICI

Write an equation for the reaction of HF with water Click in the answer box to activate the palette 0 ag aq

An atomic cation with a charge of 1 has the following electron configuration He 2s 2p5 What is the chemical symbol for the ion How many electrons does the lon have How many 2p electrons are in the ion 1 0 0 X 5

ne samarium 147 nuclide radioactively decays by alpha emission Write a balanced nuclear chemical equation that describes this process Y S C

According to the following reaction how many grams of water will be formed upon the complete reaction of 30 0 grams of oxygen gas with excess hydrogen sulfide 2H S g 30 9 2H 0 1 250 g grams water

which of the following boods is bond between a carbon and fluorice ata or k

Be sure to answer all parts Calculate both H O and OH for a solution for which pH 1 41 Enter your answers in scien notation H 0 OH x 10 select x 10 select M M

46 Balance the following equations and tell what type of reaction it is NaBr Ca OH CaBr NaOH NH H SO4 NH4 SO4 CsH10 0 Pb a b c d LiN H PO4 e NH NO3 f Al OH 3 Classify the following chemical reactions 1 C4H8 60 4CO 4H O 3 2KNO3 s 2KNO2 s O2 g 5 2Mg O 2MgO 7 MgCO3 s HBr CO H MgO s CO2 g H O Pb3 PO4 2 LINO3 H O NH 3N AlBr3 reaction type reaction type reaction type reaction type reaction type reaction type 2 HCI NaOH H O NaCl 4 AgNO3 NaC1 NaNO3 AgCl 6 2Ag S Ag S 8 Cl 2KBr 2KCl Br

Vocabulary absolute zero Boyle s law Charles s law Gay Lussac s law Kelvin scale pressure Prior Knowledge Question Do this BEFORE using the Gizmo A small helium tank measures about two feet 60 cm high Yet it can fill over 50 balloons How can such a small tank contain enough helium to fill so many balloons

Which metal does not dissolve in hydrochloric acid Au Ni Mn

Molecules of nicotine contain 10 carbon atoms 14 hydrogen atoms and 2 nitrogen atoms The molecular formula for nicotine is When an atom loses electrons it Ionic bonds involve of electrons and tend to form between Which is an example of a molecular compound Fill in the blanks by selecur one option from each menu aby Part 1 2 points Part 2 2 points aby Part 3 2 points Part 4 2 points Part 5 2 points 10 points

What is a fuel cell electric vehicle The fuel cells use the electron gaining tendency of oxygen and the electron losing tendency of hydrogen to force electrons to move through a wire creating the electricity that powers the car The fuel cells use the electron losing tendency of water and the electron gaining tendency of air to force electrons to move through a wire creating the electricity that powers the car The fuel cells use the electron losing tendency of oxygen and the electron gaining tendency of hydrogen to force electrons to move through a wire creating the electricity that powers the car The fuel cells use the electron gaining tendency of water and the electron losing tendency of air to force electrons to move through a wire creating the electricity that powers the car

3 attempts left Click in the answer box to activate the palette Write the formula of the conjugate acid of NO3

In Cairo Egypt elevation 75 feet your mass is 62 kg What is your mass in Quebec Canada elevation 322 feet A more than in Cairo B less than in Cairo C the same as in Cairo

5 1 point When the nucleus of an atom becomes unstable this causes the nucleus to Absorb energy React Oxidize Decay Release electrons DO

Write the formula of the conjugate base of CH COOH Click in the answer box to activate the palett

3 Collect data With the temperature held constant at 300 K use the Select mass slider to place weights on the lid Record the pressure and volume of the gas for each added mass Added mass on the lid 0 kg 10 kg 20 kg 30 kg Total mass lid added mass 10 kg 20 kg 30 kg 40 kg Pressure This model does not include atmospheric pressure which is 101 325 N m 4 Analyze As the pressure increases at constant temperature what happens to the volume of the gas This relationship is called Boyle s law 5 Calculate Compare the pressure and volume values in your data table A How did doubling the pressure change the gas volume B How did tripling the pressure change the gas volume Volume C How did quadrupling the pressure change the gas volume

Which metal cation has the greatest tendency to be reduced A Ni B K C Mn2 D Cu D A

As the population continues to age the demand for medical care will only increase Without the support of the federal government to supply health insurance for its citizens many people will suffer and die needlessly Can we let this happen to the people in this country O Question Strong statement

10 How much would 54 2 L of SF6 gas weigh in grams Show work and include proper significant figures

1 If you decompose 3 25 mol of Iron III Hydroxide how many moles of water will be produced Show your work and include proper number of significant figures 2Fe OH 3 Fe2O3 3H2O

A student is planning to determine the specific heat capacity of iron To do this the student will need to perform the following procedures experiment Step 1 2 3 4 5 Procedure Measure the mass of the iron sample Measure the initial temperature of a known volume of water Heat the iron sample Place the iron sample in the water What is Step 5 in the experiment 21 Measure the final mass of the iron sample Measure the final temperature of the iron sample Measure the final mass of the water Measure the final temperature of the water

b Calculate the value of K for both compounds K aniline K 3 bromoaniline

1 point What form of radiation is emitted when Np 239 decays to form the isotope Pu 239 23993 Np 23 94Pu Gamma Ray Positron Alpha particle Beta particle

Activity A Boyle s law Get the Gizmo ready Set the temperature T to 300 K Check that the mass m is set to 0 kg Question How does pressure affect the volume of a gas 1 Form hypothesis In this experiment you will pile weights on the lid of the container of gas What do you think will happen as more weight is added to the lid 2 Notice Look at the DESCRIPTION pane What is the mass of the lid How much pressure does the lid exert on the gas

Determine the moles of AICI produced when 4 75 grams of Cl reacts with Al according to the following reaction 2 Al s 3 Cl g 2 AICI s

An organic acid has pKa 4 20 Calculate its K value

3 Br 4 Ba2 6 Which of the following ions has the smallest radius 1 F 2 CI 1 2

2 Which of the following atoms has the greatest tendency to attract electrons 1 barium 3 boron 2 beryllium 4 bromine

7 Which list of elements is arranged in order of increasing atomic radi 3 Sc Ti V Cr 1 Li Be B C 2 Sr Ca Mg Be 4 F Cl Br I

Which of the following is an example of kinetic energy O O a book in a backpack a phase change chemicals sitting on a shelf particles of a gas moving about in random motion

276 mg of an unknown protein are dissolved in enough solvent to make 5 00 mL of solution The osmotic pressure of thi solution is measured to be 0 183 atm at 25 0 C Calculate the molar mass of the protein Be sure your answer has the correct number of significant digits 6 0 g

The hydronium ion concentration of a cyanoacetic acid solution is 0 047 M Calculate its pOH POH

What is the symbolic representation of a chemical reaction in the form of symbols and formulas chemical reaction chemical equation Law of Conservation of Mass chemical change

What was the original name of Lloyd s Ned O Ned Roberts O Colonel Lloyd O Aunt Hester O Captain Anthony