Chemical Kinetics Exam Name:______________________________ Part A: Multiple Choice Value: 42 marks Suggested Time: 60 minutes INSTRUCTIONS: For each question, select the best answer and record your choice on the Response Form provided. Using an HB pencil, completely fill in the circle that has the letter corresponding to your answer. 1. Consider the reaction: Ca(s) + 2H2O(l) ( Ca(OH)2(aq) + H2(g) At a certain temperature, 2.50 g Ca reacts completely in 30.0 seconds. The rate of consumption of Ca is A.
Show all work and label the two half-reactions by placing LEO and GER above the appropriate arrows: Answer the following questions that pertain to the reaction above and mark your answers on the Scantron ticket (questions 28 – 37): 28. Which element was reduced in the reaction above? A) S B) Cl C) O D) H 29. Which element was oxidized in the reaction above? A) S B) Cl C) O D) H 30.
B. How does the change in temperature affect the volume of the container? Get the Gizmo ready: Activity A: Boyle’s law Set the temperature (T) to 300 K. Check that the mass (m) is set to 0 kg. Question: How does pressure affect the volume of a gas? 1.
Using the G° data in your Appendix B, calculate the change in Gibbs free energy for each of the following reactions. In each case, indicate whether the reaction is spontaneous under standard conditions. a) H2 (g) + Cl2 (g) → 2HCl (g) b) MgCl2 (s) + H2O (l) → MgO (s) + 2 HCl (g) c) 2 NH3 (g) → N2H4 (g) + H2 (g) d) 2 NOCl (g) → 2 NO (g) + Cl2 (g) 4. From the values given for ΔH° and ΔS°, calculate ΔG° at 25°C for each of the following reactions. If the reaction is not spontaneous under standard conditions at 298K, at what temperature (if any) would the reaction become spontaneous?
20. mol H2 reacts with 8.0 mol O2 to produce H2O. Determine the number of grams reactant in excess and number of grams H2O produced. Identify the limiting reactant. 8.1 g H2 , 2.9 x 102 g H2O 17. How many litres of O2 gas are required to produce 100. g Al2O3?
Gas Laws A gas law is described as a mathematical generalization of the relationships among the amount, pressure, temperature, and volume of a gas (p 168). Boyle’s law p. 168 Of the several relationships that exist among gas law variables, the first to be discovered relates gas pressure to gas volume. It was formulated over 300 years ago, in 1662, by the British chemist an physicist Robert Boyle. Boyle’s law states that the volume of a fixed mount of a gas is inversely proportional to the pressure applied to the gas if the temperature is kept constant. This means that if the pressure on the gas increases, the volume decreases proportionally; conversely, if the pressure decreses, the volume increases.
Write all your answers on the test paper itself. After the section is over, you will be given ten minutes to transfer your answers to the given answer sheet. You are not permitted to take this exam booklet out of the examination room. There are 40 questions in this section. They are broken up into four parts as follows: Section 1 Questions 1-10 Section 2 Questions 11-20
1 q= Cs x g x T Q represents heat. Specific heat (Cs) is multiplied to the mass (g) and temperature change that occurred in the reaction. ( T). Specific heat is defined as the amount of energy required to raise the temperature of 1 g of a substance by 1 K, under a constant pressure. Considering the fact that substances have differences, the specific heat varies depending on what substance is being heated.
algreba |Name: Amanda McCutchan |Date: 4/12/13 | Graded Assignment Unit Test, Part 2: Counting and Probability Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. (10 points) |Score | | | 1. A container holds 15 pennies, 8 nickels, and 10 dimes. You will randomly select two coins without replacement.
We make 30,000 of these fire extinguishers per year. Each extinguisher requires one handle (assume a 300 day work year for daily usage rate purposes). Assume an annual carrying cost of $1.50 per handle; production setup cost of $150, and a daily production rate of 300. What is the optimal production order quantity? (4 points) Problem 4: We need 1,000 electric drills per year.