Chemist test help READ DESCRIPTION BEFORE BIDDING
Disclaimer: This is another set of practice problems, but it is not intended to cover every single type of question that will be on exam 2.
0
What is E for a system which releases 12.4 J of heat and does 4.2 J of work on the surroundings?
+16.6 J
+12.4 J
+4.2 J
-16.6 J
-8.2 J
+8.2 J
2
Correct choice: 4. -16.6 J
What volume of water must be added to 10.0 mL of 6.0 M NaOH to make a solution that is 0.30 M?
10 mL
190 mL
200 mL
210 mL
500 mL
3
What volume of 0.100 M HCl is required to completely react with 50.0 mL of 0.500 M NaOH? The reaction is: HCl + NaOH NaCl + H2O
50.0 mL
100. mL
200. mL
250. mL
500. mL
0
Given the thermochemical equation: 2 HI(g) H2(g) + I2(s) H = -52.96 kJ the heat of formation of HI(g) is
-52.96 kJ/mol
-26.48 kJ/mol
-105.92 kJ/mol
+26.48 kJ/mol
+52.96 kJ/mol
5
Correct choice: 4. +26.48 kJ/mol
Predict the products and write the molecular, total, and net ionic equation for: CaCl2(aq) + Na2CO3
Correct choice: 4. CaCO3
6
How many moles of sulfate ions are there in 0.10 L of 0.020 M Al2(SO4)3 ?
0.0020 mol
0.0040 mol
0.0060 mol
0.024 mol
0.060 mol
0
Classify the following reaction. 2 H2O2(aq) 2 H2O(l) + O2(g)
combination
decomposition
displacement
acid-base
8
Correct choice: 2. decomposition
0
What is the oxidation number of Cl in HClO2?
+3
+4
+5
+7
9
Correct choice: 1. +3
0
Stoichiometry of Acid-Base Reaction How many mL of 0.243 M NaOH(aq) are required to neutralize 15.00 mL of 0.0356 M H2SO4? H2SO4(aq) + 2 NaOH(aq) --> 2 H2O(l) + Na2SO4(aq)
10
4.40 mL NaOH needed
Identifying Oxidation/Reduction
What is the reducing agent?
MnO4–(aq) + HSO3–(aq) + 5H+(aq) Mn2+(aq) + SO42–(aq) + 3H2O(l)
Correct choice: 2. HSO3–(aq)
11
0
Calorimetry An unknown volume of water at 18.2C is added to 24.4 mL water at 35.0C. The final temperature is 23.5C. What is the unknown volume? Specific heat of water is 4.18 J/(g C) and assume density of water is 1.00 g/mL. (Assume no heat lost to surroundings.)
12
0
Stoichiometry using H How much heat is released when 100.0 g H2O(l) are formed in the following reaction? H2(g) + ½ O2(g) H2O(l) H = -285.8 kJ
13
1588 kJ