generate barcode c#.net AP Chemistry Practice Exam 1 321 in Visual C#.NET

Recognizing ECC200 in Visual C#.NET AP Chemistry Practice Exam 1 321

AP Chemistry Practice Exam 1 321
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Question 3 (a)
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43 C
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43 C
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Time
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You get 1 point for the first plot You get 1 point for the second plot only if the level region is definitely below 43 C (b) The difference in the temperatures of the two level regions ( T ) is needed You get 1 point for this answer (c) The mass (in grams) of the unknown solid and the mass (in kilograms) of the phenol are required You get 1 point for each of these answers (d) The required equation is: T = K f m Calculate the molality of the solution by dividing the change in temperature ( T ) by the freezingpoint depression constant (Kf ) Calculate the moles of the unknown by multiplying the molality of the solution by the kilograms of phenol Calculate the molar mass by dividing the grams of the unknown by the moles of the unknown You get 1 point for each correct calculation you listed Total your points There are 8 possible points Question 4 (a) 6 CN (aq ) + Fe 3+ (aq ) [Fe(CN)6 ]3 (aq )
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3+ The cyanide ion is donating a pair of electrons to Fe Thus, the cyanide ion is a Lewis base You get 1 point for the correct formulas for the reactants and products, and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
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Cl 2 + 2 I 2 Cl + I2 The reducing agent is the iodide ion and the oxidizing agent is chlorine gas You get 1 point for the correct formulas for the reactants and products, and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
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Fe 3+ + 3 OH Fe(OH)3 The nitrate and potassium ions are spectator ions in this reaction You get 1 point for the correct formulas for the reactants and products, and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
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322 U STEP 5 Build Your Test-Taking Confidence
Question 5 (a) *analytical balance desiccator pH meter wash bottle *buret drying oven pipet clamp *Erlenmeyer flask support stand
You get 1 point if you have ALL the starred items You get 1 point for the other items There is a maximum of 2 points If you have only some of the starred items, your maximum is 1 point (b)
pH > 1
Volume Added Equivalence point at pH > 7
You get 1 point for this graph You get 1 point for noting that the equivalence point is greater than 7 (c)
You get 1 point for this graph You must show two regions (d) 1 Weigh a sample of HA 2 Titrate HA versus standard NaOH to find the volume of NaOH solution required to neutralize the acid 3 Multiply the concentration of the NaOH solution times the volume used to get the moles of NaOH 4 The moles of HA is the same as the moles of NaOH 5 Divide the mass of HA by the moles of HA You get 2 points if you list all five steps If you miss one or more steps you get only 1 point You get 0 points if you get none of the steps correct There are no bonus points for more steps or more details (e) If the KHP contained an inert impurity, the concentration of the NaOH solution would be too low If the concentration of the NaOH solution were too low, then more solution would be needed for the titration of HA This would yield a lower number of moles of HA, giving a higher molar mass
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