CHEM 103 Chemistry (CHEM103)

In the Boyle’s law experiment, how was the volume of gas at different pressures determined? 2. (2 points) 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. 2. increase...

What does it mean that the heat of a reaction is an extensive property? 2. (3 points) Does the following reaction give off heat or absorb heat? Explain briefly. C D H = +263Kcal/mol 3. (4 points) In one experiment in the video, room temperature water was mixed with water at about 38 degrees. To what temperature (about) did the mixture of the two water samples come to after setting for a few minutes? Answer: 1. The heat depends on the amount of substance. If the amount of substance is d...

Show the calculation of the heat of reaction (ΔHrxn) for the reaction: 2 C2H6 (g) + 5 O2 (g) → 4 CO (g) + 6 H2O (l) by using the following thermochemical data: ΔHf 0 C2H6 (g) = -84.0 kJ/mole, ΔHf 0 CO (g) = -110.5 kJ/mole, ΔHf 0 H2O (l) = -285.8 kJ/mole Your Answer: 2 C2H6 (g) + 5 O2 (g) → 4 CO (g) + 6 H2O (l) ΔHrxn = ∑ n ΔHf 0 (products) - ∑ m ΔHf 0 (reactants) ΔHrxn = 4 ΔHf 0 (CO) + 6 ΔHf 0 (H2O) - 2 ΔHf 0 (C2H6 ) - 5 ΔHf 0 (O2) ΔHrxn = 4 (-110.5 kJ/mole...

Classify each of the following as an element, compound, solution or heterogeneous mixture and explain your answer. 1. Barium chloride 2. Blood 3. Boron Answer: 1. Barium chloride - is not on periodic table (not element) - has two element names = Compound 2. Blood - is not on periodic table (not element) - no element names (not compound) appears to be one substance = Solution 3. Boron - is on periodic table = Element 7. Classify each of the following as a chemical change or a physical...

CHEM 103 experiment 6 :Lab report (Portage learning) 2023

CHEM 103 MODULE 2 EXAM 2022 Show the calculation of the molecular weight for the following compounds, reporting your answer to 2 places after the decimal. 1. Al2(CO3)3 2. C8H6NO4Cl 1. 2Al + 3C + 9O = 233.99 2. 8C + 6H + N + 4O + Cl = 215.59 Question 2 Click this link to access the Periodic Table. This may be helpful throughout the exam. Show the calculation of the number of moles in the given amount of the following substances. Report your answerto 3 significant figures.