Chem 1311 exam 4 - Study guides, Class notes & Summaries

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...

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. ...

What is the molarity of a 250mL solution that contains 0.45 moles of LiCl? correct answers1.80 M If 1.3 moles of Mg are allowed to react with 2.1 moles of O2, how many moles of MgO will be produced? 2 Mg + O2 —> 2 MgO correct answers1.3 moles of MgO How many moles of NaCl are contained in 43.5mL of 0.85 M solution? correct answers0.037 moles A sample of orange juice has an H3O+ concentration of 3.55 x 10^-5 M. What is its pH? correct answers4.45 How much heat is required to war...

When a system _____________, change of E is always negative. correct answersGives 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 answersExothermic, released Which of the following is a statement of Hess's law? correct answersIf 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. For...

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 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...

This set of detailed notes provides the necessary information for the first 4 modules in chem 1311. The topics covered are, but not limited to: Molecules, laws, atomic rules, compounds, ionic compounds, terms, and element tables to specify ionic compound numbers & charges. I’ve provided charts, example problems, key words/definitions, and key side notes identified with ** that are summarized to help you memorize the most important parts. There are also a few mini pictures and silly phrases to ...