General Questions and Answers

12 Aqueous solutions of sodium phosphate and calcium nitrate are mixed together 2 pts What is the balanced equation for the reaction 6 pts Based on your balanced equation how many mL of 0 30 M sodium phosphate are required to react with 25 mL of 0 20 M calcium nitrate mL of sodium phosphate 10 pts Fill in the blanks to complete the recipe for making 25 g of the precipitate in the balanced equation you wrote above To make 25g of precipitate mix mL of 0 35 M calcium nitrate mL of 0 25 M sodium phosphate and

60 Select one 18 Dimensional Analysis 2 Molar Concepts Question 9 How many individual oxygen atoms would you find in 1 mole of O2 81 O 1 204 x 1024 oxygen atoms O O O 1 204 x 1023 oxygen atoms 6 022 x 1024 oxygen atoms 6 022 x 1023 oxygen atoms

6 A student has a 5 00 gram sample of calcium chloride CaCl2 solid How many moles of calcium chloride are contained in this sample A 378 moles of CaCl B C 555 moles of CaCl D OA 0 0662 moles of CaCl OB OC 0 0451 moles of CaCl

1 The colonizing council would like you to compare the characteristics of an earthquake produced tsunami wave and a wind generated surface wave They have decided to compare velocity wavelength frequency and period of the waves in open water before they reach land Use the data given to answer the following questions about the waves Calculate the missing values and drag them to the correct blanks Wave Type Velocity v m s Wavelength A m v fa Tsunami wind generated Calculator format v f A 12 5 222 0 083 f 160 000 12 150 0 00139 Frequency f Hz f OR f 1 T Calculator format f 1 T Calculator format f v A 137 5 115 000 Period T s T 1 720 Calculator format T 1 f

rrange the compounds by boiling point Highest boiling point Lowest boiling point pentane neopentane hexane H C CH CH CH CH CH3 H C C CH CH3 H3C CH CH2 CH CH CH

4 a Calculate the volume of 42 0g of tin density 7 29g cc b Calculate the volume of 48 0g of lead density 11 34g cc

n the dropdown boxes select the conversion factor that properly completes each problem 1 20 mol Cu x Select 7 22 1023 Cu atoms

3 Write the balanced chemical equation for each of the following descriptions Use Table F to determine the state of the reactants and products s or aq Write soluble or insoluble under each reactant and product Square off the precipitate a Solutions of sodium carbonate and silver nitrate are mixed to form sodium nitrate and silver carbonate NGCO3 AgNO3 NaNO3 AgCO3 Soluble insoluble b AgC H3O2 aq is mixed with NaCl aq to form AgCl and NaC H3O2 c Solutions of potassium sulfate and calcium chlorate are mixed to form potassium chlorate and calcium sulfate Kc10 Caso 4 Soluble KSO4 CaClO3 d CaCl aq and Na S aq are mixed to form CaS and NaCl CaCl Na S Cas Nac 2 soluble insoluble in soluble e What do all the above double replacement reactions have in common PUT CHUMBAS

3 To what volume should 25 mL of 15 M nitric acid by diluted to prepare a 3 0 M solution M M Show work 45 V 25 Equation 3 0 V2 Answer

What properties do acids have and what ion is associated with them

1 Point O Dense Air O Little or No Precipitation O Clear Skies

1 Video According to the video which of the following does not occur on Jupiter 1 Point Winds on the surface can reach 300 mph Diamonds form in the atmosphere Hundreds of jet stream currents circle the planet The Red Spot is an immense hurricane three times the size of the Earth

7 Suggest four ways to increase the concentration of SO in the following equilibrium 2SO g O g 2SO g 1923 kJ a b d

A person reacts 21 6mol of aluminum metal with excess oxygen gas according to the reaction below How many particles in moles of aluminum oxide Al2O3 will form Reaction 4Al s 302 g 2Al2O3 s

A particular reactant decomposes with a half life of 117 s when its initial concentration is 0 301 M The same reactant decomposes with a half life of 209 s when its initial concentration is 0 169 M Determine the reaction order 02 Oo What is the value and units of the rate constant for this reaction P 11 Units

A person dissolves 9 17g of sodium chloride in 302mL of water If the solution is diluted with an additional 364mL of water what mass in grams of sodium chloride will be in the solution Round to 2 decimal places

When an acid is combined with a base Which of the following is always included in the products O Water O Hydrogen lons Hydroxide lons O Metal O None of these Halogens

A scientist has an acidic solution What could they do to make the solution less dangerous and increase it s pH Add H SO4 to it Add more acid to it O Add hydrogen ions to it O Add NaOH to it O Add HBr to it

A person has 177mL of a 3 85M lithium bromide LiBr solution If they would like to dilute the solution to a concentration of 0 51M how much water would they need to add in liters Round to two decimal places

A scientist has a sample of hydrobromic acid HBr with an unknown concentration They titrate 60mL of it with 1 7M barium hydroxide Ba OH 2 and it requires 100 83mL of barium hydroxide to neutralize it What is the concentration molarity of the hydrobromic acid sample Reaction 2HBr aq Ba OH 2 aq 2H O 1 BaBr2 aq

How will the rates of the reaction catalyzed by pepsin Figure 19 7b compare at pH 2 and pH 4 EM 19 14

431 8mL of a 0 65M silver 1 nitrate AgNO3 solution is added to excess copper metal What mass in grams of copper II nitrate Cu NO3 2 would form Reaction 2AgNO3 aq Cu s Cu NO3 2 aq 2Ag aq

A student measures out 2 00L of a 2 10M sodium chloride solution How many moles of sodium chloride did the student measure out round to two decimal places

groups sites of enzymes Identify the acidic and basic amino acids in the active site in the diagram below Hint Consult Table 18 3 and Chapter 10 for the definition of acids and bases CH OH CH COO H N CH 2 C O NH CH 3 NH H N NH CH

19 50 Must the amino acid residues in the active site be near each other along the polypeptide chain Explain b stive site of enzyme is a small portion of the soon of the rest of the 162

45 2 points Hydrogen peroxide decomposes into water and oxygen when exposed to heat of light A tightly capped bottle of hydrogen peroxide is place on a balance and exposed to light for three weeks and the mass remains unchanged This is an example of The Law of Conservation of Mass The Law of Multiple Proportions The Law of Constant Composition The Law of Definite Proportions Previous Next

3 Amy shrieked when she saw a tiny mouse start to scurry across the floor It scampered past the chair and began to eat a bread crumb Amy screeched to her father to come downstairs to get rid of the creature Find 3 synonyms included in the following paragraph SYNONYMS 1 Type here SYNONYMS 2

sodium hydroxide NaOH solution What mass of solid sodium hydroxide would they need to create this solution Round answer to 2 decimal places

38 2 points Two molecules with the same formula but different structures are called isotonics isotopes isobars isomers

Which of the following is the best hypothesis O A Physical changes are much less interesting to watch than chemical changes B If sodium carbonate is added to vinegar the reaction will absorb heat C Tearing a piece of paper is an example of a physical change OD Some chemical reactions absorb heat and others release heat

Which of the following is the correct shorthand electronic configuration for Palladium Pd O kr 4d8 O kr 5s 4d8 O Ar 4d10 Kr 4d10

What can be inferred from the given lines After all the cries and series of mutual blames stillness cast over Everything was understood and everything was forgiven O Resolution O Mystery Suspense

In Common Sense by Thomas Paine what is considered as a great sin committed by the ancient Jew Worship of Idols Enslavement of people O Request for a king

1 Give at least two other examples of physical properties

score possible is 200 points You have 2 hours to Question 10 Write the Suffix that means disease

nswer the following short answer questions according to what is asked for in each 8 Determine how many moles of product are formed when 18 23g of K O reacts with excess water from the UNbalanced equation below 6 points K O H O KOH

How many grams of the oxygen gas product are prodced with 1 25 moles of water What is the yoeld if 18g of the oxygen gas product was actually obtained

Translate Each Word Equation Into a Balanced Chemical Equation A Combination Reactions 1 magnesium metal s oxygen g Amagnesium oxide s 2 zinc metal s sulfur s zinc sulfide s B Decomposition Reactions 1 copper II sulfate pentahydrate s copper II sulfate s water g 2 sodium hydrogen carbonate s C Replacement Reactions sodium carbonate s water e carbon dioxide g

Nuclear Change 1 Question 9 When carbon and helium atoms undergo fusion oxygen and one neutron are produced The total mass of the products is less than the total mass of the carbon and helium that combine Which statement BEST explains the decrease in the total mass ect one OTwo atoms are combined to form one atom O Some of the mass is lost as undetectable particles O Some of the mass was used up during the reaction O The difference in mass was transformed into energy

3 Why is density a physical property useful for identifying unknown

10 3 zero molanty a zero molarity a zero b less than 2 M A solution begins with molarity of 2 M More solute is added to the solution What is the new b less than 2 M c 2M d more than 2M A solution begins with molarity of 2 M More solvent is added to the solution What is the new b less than 2M c 2 M d more than 2M Some solvent evaporates from the solution What is the c 2 M d more than 2M B 11 A solution begins with molarity of 2 M Half of the solution is poured down the drain What is the new molarity of the remaining solution a zero b less than 2 M c 2 M d more than 2M Use these answer choices for the following questions 50 mL 50 mL 50 mL 25 mL Which solution has the greatest concentration m 25 mL 1pt each 25 mL Look at solution A above Which other solution has the same molarity as solution A

Write only one of the meanings of the suffix ptosis

Identify the chemical formula for each of the following substances Refer to your observations in the Data Table along with the corresponding word equations T a white smoke Procedure A 1 b colorless liquid Procedure B 1 c flame extinguishing gas Procedure B 2 d gray solid Procedure C 1 e colorless gas Procedure C 2 f Yellow ppt Procedure D 2 g White ppt Procedure D 4 h white ppt Procedure D 6 2 Change the following word equations to balanced chemical equations a copper metal oxygen copper II oxide silver

How many moles are in 7 5 x 1024 molecules of ammonia NH3

Calculate the mass of the following substances 1 43 moles of Sodium hydroxide NaOH 2 4 2 moles of Calcium Sulfate CaSO4 2012 3 50 moles of Potassium Permanganate KMnO4 4 25 moles of Copper Sulfate CuSO4 00

Potassium chloride and lead II nitrate undergo a double replacement eaction Predict the formulae of the two products of the reaction Tap to select or deselect answer OK Pb and CINO3 KNO3 and PbCl K NO3 2 and PbCl K NO3 2 and PbCl KPb and CI NO3 2

Predict the products for the following acid base reaction Balance the reaction Do NOT leave any box blank You need to put a 1 in the box if the coefficient is 1 HF aq Mg OH 2 aq 0 0

2 Na Cl 2 NaCl 15 mol Na reacts with 15 mol Cl to produce NaCl If a student carries out this procedure and obtains 12 mol NaCl what is his percent yield Enter your answer as a whole number

Q14 Which equation correctly represents the first ionization of copper A Cu g Cu g le B Cu g Cu g le C Cu s e Cu g 1e D Cu g Cu g le Q15 The correct order of increasing atomic radius A Mg Na K Rb B Na K Rb Mg C Mg Na Rb K D Mg Na

What masses of products are produced from the combustion of 88 grams propane gas in presence of excess oxygen gas 240 86 g CO and 123 89 g H O O 145 g CO and 270 g H O O 145 g CO and 143 90 g H O 263 46 g CO and 143 90 g H O