Chem 1311 exam 1 Study guides, Class notes & Summaries

CHEM 1311 Exam 1 Questions With Complete Solutions

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...

Chem 1311 Exam 1 Questions With Complete Solutions

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...

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...

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...

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...

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 ______...

1. Which of the following is an example of a quantitative observation? A) The piece of metal is longer than the piece of wood. B) Solution 1 is much darker than solution 2. C) The liquid in beaker A is blue. D) The temperature of the liquid is 60°C. E) At least two of the above (A-D) are quantitative observations. ____ 2. Which element does not exist naturally on earth? A) Bismuth B) Uranium C) Lanthanum D) Technium E) Protacinium ____ 3. 8.1 milligram(s) contains this many grams. ...

chemical property correct answer: the way substances may change/react to become another substance physical property correct answer: can be observed without any change to identification and/or composition matter correct answer: anything that has mass and occupies space reactivity, stability, flammability, toxicity, fermentation correct answer: examples of chemical properties malleability, ductility, conductivity, viscosity, boiling/melting point correct answer: examples of physic...