CHEM 103 Chemistry (CHEM103)

CHEM 103 Module 3 Exam with Answers – Portage Learning. The calorimeter and mixture of HCl + NaOH Your Answer: 1. The type of thermochemical process is an acid base reaction or neutralization reaction where heat is given off called a exothermic reaction. 2. The calorimeter and mixture of HCl + NaOH would be described as enthalpy or the total energy of the system. 1. Heat given off = Exothermic process 2. With lid = closed system Question 2 Not yet graded / 10 pts Click this link to a...

CHEM 103 Module 1 Exam Questions and Answers. Do the conversions shown below, showing all work: 1. 246oK = ? oC 2. 45oC = ? oF 3. 18oF = ? oK Answer: 1. 246oK - 273 = -27 oC oK → oC (make smaller) -273 2. 45oC x 1.8 + 32 = 113 oF oC → oF (make larger) x 1.8 + 32 3. 18oF - 32 ÷ 1.8 = -7.8 + 273 = 265.2 oK oF → oC → oK 4. Be sure to show the correct number of significant figures in each calculation. 1. Show the calculation of the mass of a 10.5 ml sample of mercury with densi...

CHEM 103 Lab Exam 8 – Portage Learning. Why was warming data used for estimating the freezing/melting point of the cyclohexane? 3. (3 points) How much of the cyclohexane solvent was placed in the test? 1.) molarity 2.) It is considered reliable. It is a dependable predicator of the freezing/melting point of a substnace. it can determine the temperatures when the change occurs.

CHEM 103 Lab Exam 6 – Portage Learning. Bonds within a molecule are called intra-molecular bonds. Non-polar (type) compounds are insoluble in water

CHEM 103 Lab Exam 3 – Portage Learning. A 1.1000 gram hydrate sample chosen from Na2CO3∙10H2O, AlCl3∙6H2O, MgCl2∙6H2O and BaCl2∙2H2O was heated and found to lose 0.5841 gram of H2O. (1) Show the calculation of the % H2O in the unknown hydrate sample. (2) Show the calculation of the % H2O in each of the hydrate compounds and identify the unknown hydrate from the list. Atomic weights: H = 1.008, O = 16.00. MWs: Na2CO3∙10H2O = 286.15, AlCl3∙6H2O = 241.43, MgCl2∙6H2O = 203.301 ...

CHEM 103 Lab Exam 2 – Portage Learning. A decomposition reaction has more products than reactants. exothermic Correct! decomposition

CHEM 103 Lab Exam 1 – Portage Learning. Which of the volume-measuring devices was determined to be least accurate in the volume measurement experiment? 2. What was the calculated volume for the pipet in the volume measurement experiment? 3. Water at 22.5oC has a density of 0.99766 g/ml. A 10.3 ml sample of water at 22.5oC, delivered from a buret had a mass of 10.1532 grams as measured on an analytical balance. (1) Show the calculation of the actual volume as determined from this mass. (...

CHEM 103 Lab Exam 5 – Portage Learning . According to Boyle’s law, as the volume of a gas decreases, the pressure _________. 3. (6 points) A sample of gas occupies a volume of 10.5 L when the pressure is 14.3 psi. Use Boyle’s Law to calculate the volume (L) when the pressure is decreased to 12.8psi. Show the calculation. Answer: 1. A syringe was used, and the volume was read from the graduation markings.

CHEM 103 Lab Exam 4 – Portage Learning. How much heat was gained by the tap water if the specific heat of water is 4.18 J/K-g? 2. (3 points) In one experiment in the video, HCl was mixed with another substance. What other substance was mixed with HCl? 3. (4 points) One student conducts an acid-base reaction where he finds the following results. What is the enthalpy of the reaction (in KJ/mol)? Heat gained by solution 3875 J

CHEM 103 Module 3 Exam Portage Learning 2023. NH4Cl is being dissolved in water and this process is being studied in a styrofoam coffee cup with a lid and the heat absorbed is measured by means of a thermometer immersed in the reaction mixture. Enter the correct thermochemistry term to describe the item listed. 1. The type of thermochemical process 2. The air above the cup Your Answer: 1) endothermic 2) Surroundings 1. Heat absorbed = Endothermic process 2. The air above the cup = Surro...