QUESTION 1 The reaction Zn(s) + CuSO 4 (aq) ZnSO 4 (aq) + Cu(s) is run in a coff

Question

QUESTION 1

The reaction Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s) is run in a coffee cup calorimeter with the Zn as shown below. Which of the following is part of the short-term surroundings? (select all that apply)

Zn

ZnSO4

water

coffee cup

CuSO4

temperature probe

4 points   

QUESTION 2

Which of the chemical in this experiment is(are)an irritant? (select all that apply)

citric acid

hydrochloric acid

magnesium

sodium hydrogencarbonate

2 points   

QUESTION 3

How many moles of ethanol are in 25.0 mL of a 1.50 M solution?

4 points   

QUESTION 4

Which of the chemical in this experiment is(are) flammable? (select all that apply)

citric acid

hydrochloric acid

magnesium

sodium hydrogencarbonate

2 points   

QUESTION 5

The reaction Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s) is run with 25.0 mL of 0.50 M CuSO4 as the limiting reactant. If the temperature of the solution rose 25.0°C and the mass of the solution was 25.0 g, what is the H of the reaction, in kJ/mol? (assume the specific heat of the solution is 4.18 J/g°C)

8 points   

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Zn

ZnSO4

water

coffee cup

CuSO4

temperature probe

Explanation / Answer

Ans 1. Temperature probe is part of short term surrounding.

Ans 2. Citric acid and Hcl are both irritant. Citric acid is irritant to skin and eyes.

Ans 3. no. of moles of ethanol = molarity * volume(in L) = 1.5 * 0.025 = 0.0375 mole

Ans 4. Mg is flammable, Mg react with O2 and form MgO

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