Chem 131 Study guides, Class notes & Summaries

CHEM 131 Introduction to Chemistry with Lab Test | Guide 2023. Suppose you were tasked with producing some nitrogen monoxide (a.k.a. nitric oxide). I'm sure this is often requested of you. You can do it by combusting ammonia (be careful!). The equation would be as follows: 4NH3 + 5O 2→ 4NO + 6H2O. If you form 3.50 mol of water, how much NO forms? A.2.33 mol. B.4.00 mol. C.4.50 mol. D.6.75 mol. E.none of the above Answer Key: A Feedback: Good. See section 8.6 Question 9 of 12 0.0/ ...

Propane (C₃H₈) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0g of Carbon Dioxide are produced from the reaction 22.05g of propane with excess oxygen. What is the % yield in this reaction? -94.5 -66.0 -86.4 -38.0 -57.6 correct answer: 57.6 Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00L of argon gas at standard conditions? -4.76x10²² -6.02x10²³ -3.43x10²⁵ -1.59...

Of the following only,_________ is an extensive property. -Temperature -Boiling point -Freezing point -Density -Volume correct answer: Volume In the following list, only __________ is not an example of a chemical reaction. -the production of hydrogen gas from water -chopping a log into sawdust -the tarnishing of a copper penny -burning a plastic water bottle -charging a cellular phone correct answer: chopping a log into sawdust In which of the following numbers ar...

A __________ ΔH corresponds to an __________ process. -zero, endothermic -positive, exothermic -negative, endothermic -zero, exothermic -positive, endothermic correct answer: positive, endothermic Which one of the following is NOT considered a fossil fuel? -natural gas -hydrogen -anthracite coal -petroleum -crude oil correct answer: hydrogen Which one of the following statements is FALSE? -The enthalpy change for a reaction is equal in magnitude, but opposite i...

According to VSEPR theory, if there are 2 electron domains on a central atom, they will be arranged such that the angles between the domains are __________. -120° -180° -90° -109.5° -360° correct answer: 180° An electron domain consists of __________. a) a nonbonding pair of electrons b) a single bond c) a multiple bond -a only -b only -c only -a, b, and c -b and c correct answer: a, b, and c The O-C-O bond angle in the CO₃²⁻ ion is approximately ______...

In which set of elements would all members be expected to have very similar chemical properties? -P, Se, I -Br, I, At -Ne, Na, Mg -Cl, Br, Na -Si, As, Te correct answer: Br, I, At Of the following elements, which have been shown to form compounds? helium neon argon krypton xenon -xenon, krypton, and argon -xenon only -xenon and krypton -xenon and argon -None of the above can form compounds correct answer: xenon, krypton, and argon Which of the following correctly re...

What is Planck's constant represented as? correct answer: h What is the value of Planck's constant? correct answer: 6.63 x 10^-34 Js How is the principal quantum number symbolized? correct answer: n How is angular momentum quantum number symbolized? correct answer: l How is magnetic quantum number symbolized? correct answer: m or mℓ How is spin quantum number symbolized? correct answer: s or ms In quantum mechanics, how many quantum numbers are needed to describe elec...

The Greeks correct answer: tried to explain chemical changes, proposed four fundamental substances (earth, fire, water, air), first proposed atoms as fundamental particles The Alchemists correct answer: "pseudoscience"/tried to change a base metal of lead into gold Robert Boyle correct answer: First "chemist"/quantitative measurements on gases/proposed the concept of elements Joseph Priestly correct answer: discovered oxygen/carefully studied chemical reactions Law of Mass Co...

CHEM 1311 Exam 1 Questions With Complete Solutions

Chapter 10: Chemical Bonding II: Molecular Geometry and Hybridization of Atomic Orbitals 1. Give the number of lone pairs around the central atom and the molecular geometry of CBr4. A) 0 lone pairs, square planar D) 1 lone pair, trigonal bipyramidal B) 0 lone pairs, tetahedral E) 2 lone pairs, square planar C) 1 lone pair, square pyramidal Ans: B Category: Medium Section: 10.1 2. Give the number of lone pairs around the central atom and the molecular geometry of SCl2. A) 0 lone pairs, ...