Chem 1311 exam 3 - Study guides, Class notes & Summaries

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...

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

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: ...

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

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

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is the general electron configuration for the outermost electrons of elements in the alkaline earth group? 1) A) ns2np5 B) ns2 C) ns1 D) ns2np6(n -1)d6 E) ns2np4 2) Which of the following is the electron configuration for the bromide ion? 2) A) [Kr]5s24d105p7 B) [Xe] C) [Kr] D) [Ar] E) [Ar]4s23d104p7 3) Valence electrons are electrons located 3) A) in the out...

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...

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...