Chem. 1A Midterm 1 Practice Test 2
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1 Chem. 1A Midterm 1 Practice Test 2 All work must be shown on the exam for partial credit. Points will be taken off for incorrect or missing units. Calculators are allowed. Cell phones may not be used as calculators. On fundamental and challenge problems you must show your work in order to receive credit for the problem. If your cell phone goes off during the exam, you will have your exam removed from you. Fundamentals (of 36 possible) Problem 1 (of 12 possible) Problem 2 (of 22 possible) Multiple Choice (of 30 possible) Midterm Total (of 100 possible) 1
2 Fundamental Questions Each of these fundamental chemistry questions is worth 6 points. You must show work to get credit. Little to no partial credit will be awarded. Make sure to include the correct units on your answers. 1b) 1 pts How many kilograms are in 3251 mg? 1b) 2 pts How many moles of Cu are in 3.20 g? 1c) 3 pts How many widgets are in moles? 2) 6 pts What ionic compound is formed between a) calcium and bromine and b) potassium and oxygen? 3a) 3 pts Convert the following into balanced equations When gallium metal is heated in oxygen gas, it melts and forms solid gallium(iii) oxide. 3b) 3 pts When crystalline potassium chlorate is heated to just above its melting point, it reacts to form two different crystalline compounds, potassium chloride and potassium perchlorate. 2
3 4) 6 pts Balance the following equations? a) MnO2(s)+ HCl(aq) Cl2(aq)+ MnCl2(aq)+ H2O(l) b) BCl3(g)+ H2O(l) B(OH)3(aq)+ HCl(aq) 5a) 3 pts What are the names of the following elements: Mo, Mg, and Sn? 5b) 3 pts What are the names of the following compounds: a) SF6 and b) AlF3? 6) 6 pts How many protons, neutrons, and electrons does a) neon-22 and b) 209 Bi 3+ have? 3
4 Challenge Problems Each of the following short answer questions are worth the noted points. Partial credit will be given. You must show your work to get credit. Make sure to include proper units on your answer. 1) 12 pts An iron bar weighed 664 g. After the bar had been standing in moist air for a month, exactly one-eighth of the iron turned to rust (Fe2O3). Calculate the final mass of the iron bar and rust. 4
5 2) A solid compound x contains 63.3% Mn and 36.7% O by mass. When X is heated, oxygen gas is evolved and a new solid compound Y containing 72.0% Mn and and 28.0% O is formed 2a) 9 pts Determine the empirical formula of X. 2b) 9 pts Determine the empirical formula of Y. 2c) 4 pts Write a balanced equation for the conversion of X to Y. 5
6 Multiple Choice Questions On the ParScore form, you need to fill in your answers, perm number, test version, and name. Failure to do any of these things will result in the loss of 1 point. Your perm number is placed and bubbled in under the ID number. Do not skip boxes or put in a hyphen; unused boxes should be left blank. Bubble in your test version (A) under the test form. Note: Your ParScore form will not be returned to you, therefore, for your records, you may want to mark your answers on this sheet. Each multiple-choice question is worth 5 points. 1. Compound X2Y is 60% X by mass. Calculate the percent Y by mass of the compound X2Y2. A) 50% B) 20% C) 30% D) 40% E) None of the above. 2. Which of the following is not the correct chemical formula for the compound named? A) All of the formulas are correct. B) Fe2O3 iron(iii) oxide C) PBr5 phosphorus pentabromide D) CoO cobalt(ii) oxide E) CaSO4 calcium sulfite 3. For a new element, 67.16% is an isotope with mass amu, 2.76% is an isotope with mass amu, and 30.08% is an isotope with mass amu. Calculate the average atomic mass of this new element. A) amu B) amu C) amu D) amu E) None of the above. 4. What is the correct formula for chromium(vi) oxide? A) CrO3 B) Cr2O3 C) Cr6O D) CrO6 E) None of the above. 6
7 5. Consider the following balanced equation: A(g) + 5B(g) 3C(g) + 4D(s) When equal masses of A and B are reacted, which is limiting? A) If the molar mass of A is less than the molar mass of B, then B must be limiting. B) More information is needed. C) If the molar mass of A is greater than the molar mass of B, then A must be limiting. D) If the molar mass of A is less than the molar mass of B, then A must be limiting. E) If the molar mass of A is greater than the molar mass of B, then B must be limiting. 6. How many of the following chemical formulas are written incorrectly? ClNa BaBr2 LaF2 ClRb A) All are written incorrectly. B) One is written incorrectly. C) Two are written incorrectly. D) All are written correctly. E) Three are written incorrectly. 7
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Unit 9: The Mole- Funsheets Part A: Molar Mass Write the formula AND determine the molar mass for each of the following. Be sure to include units and round you answer to 2 decimal places. 1) calcium carbonate
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2. The accepted density for copper is 8.96 g/ml. Calculate the percent error for a measurement of 8.86 g/ml.
Chem 250 2 nd Semester Exam Review Worksheet (answers and units are at the end of this worksheet, cross them off as you write down the answers to each question.) 1. Round to the correct number of significant
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