Chem 1311 exam 1 - Study guides, Class notes & Summaries

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...

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...

the only type of movement particles in a solid do is _______ correct answersvibrational physical properties correct answersobserved or measured without changing the substance chemical properties correct answersonly observed by changing the substance intensive properties correct answersdo not depend on the amount of matter present extensive properties correct answersdepend on the amount of matter that is present physical change correct answersA change in a substance that does not c...

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...

CHEM 1311 - Exam 1 Questions With Complete Solutions

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...

Atom correct answer: Smallest quantity of matter that retains the properties of matter. Building blocks of all matter Element correct answer: A substance made up of a single type of atom. α Particle correct answer: A positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission. β Particle correct answer: High-speed electron, especially emitted in radioactive decay γ Rays correct answer: high-energy electromagnetic rad...

Atom correct answersSmallest quantity of matter that retains the properties of matter. Building blocks of all matter Element correct answersA substance made up of a single type of atom. α Particle correct answersA positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission. β Particle correct answersHigh-speed electron, especially emitted in radioactive decay γ Rays correct answershigh-energy electromagnetic radiation emi...

Which of the following best describes the principle quantum number (n)? correct answersThe principle quantum number (n) describes the orbital shell or level that an electron can be found in. It is always a positive integer, such as 1,2,3. What are the n and l values for an electron in the 4p? correct answersn = 4 l = 1 What are the n and l values that describe an electron in the 5s level? correct answersn = 5 l = 0 Which of the following represents the electron configuration of Si? corr...