Chem 1311 Study guides, Class notes & Summaries

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? A)Cs, Ba B)H, Li C) Ga, Ge D)Ca, Sr E)C, O correct answersD) Ca, Sr What is the correct answer (reported to the proper number of significant figrues) to the following? 6.3x3.25 = A)20.5 B)20 C)20.48 D)20.475 E)21 correct answersB) 20 If matter is uniform throughout and cannot be separated into other substances by physical means, it is ________. A) An elem...

Chem 1311 Exam 1 - Ch1, 2, 3 (In addition to memorizing polyatomic and monoatomic ions)

CHEM 1311 Exam Questions and Answers All Correct A tentative explanation for a set of observations that can be tested by further experimentation is referred to as - Answer-a hypothesis Identify which of the following are examples of physical properties - Answer--The boiling point of ethanol -The Density of Neon gas -The melting point of gold -The condensation of Steam Give the number of significant figures in each of the following numbers. a. 0. b. 1000. - Answer-6 and 4 The high...

How many lone pairs of electrons are on the central element in CCI4? correct answer: 0 Use the VSEPR theory to predict the molecular geometry of nitrogen tribromide, NBr3 correct answer: Trigonal Pyramidal ________hybrid orbitals are used for bonding by Xe in the XeF4 molecule. correct answer: sp^3d^2 Which set of ions are isoelectronic in their ground state electron configuration? correct answer: N^3-, o^2-, Mg^2+, Al^3+ The familiar phenomenon of a rainbow results from the diff...

Hydrogen Bonds correct answer: - Specific type of dipole-dipole interaction - MUST have a H covalently bonded to F O or N Dipole-Dipole correct answer: - Attractions between polar molecules - Weaker than covalent bonds - Stronger the dipole moment, the boiling point gets larger Dispersion Forces correct answer: - Everything has these - Attractions arise from movement - Short-lived interaction; Very weak - Contribute to ALL intermolecular forces London Forces depend on: ...

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 answers57.6 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 -1.59x1...

CHEM 1311 Exam Questions with All Correct Answers How many significant figures should be retained in the result of the following calculation 12.00000 x 0.9893 + 13.00335 + 0.0107 - Answer-3 of the following, only ________ is an extensive property. - Answer-Volume Iron has a density of 7.9 g/cm3. What is the mass of a cube of iron with the length of one side equal to 55.0 mm? - Answer-1.3 x 10^3 In the following list, only ______ is not an example of a chemical reaction. - Answer-cho...

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

When a system _____________, change of E is always negative. correct answer: Gives off heat and does work The reaction 4Al(s) + 3O2(g) --> 2Al2O3(s) Delta H = -3351 kJ is ___________, and therefore heat is ___________ by the reaction. correct answer: Exothermic, released Which of the following is a statement of Hess's law? correct answer: If a reaction is carried out in a series of steps, the H∆ for the reaction will equal the sum of the enthalpy changes for the individual steps. ...

CHEM 1311 Test 2 Questions with Correct Answers Propane (C3H8) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen. What is the % yield in this reaction? - Answer-57.6 Gaseous argon has a density of 1.40g/L at standard conditions. How many argon atoms are in 1.00L of argon gas at standard conditions? - Answer-2.11 x 10^22 How many Carbon Atom...