CHEM 1110 Midterm: Chemistry 1110 2004 Spring Test 3

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31 Jan 2019

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Instructions: you have 75 minutes to complete this 100-point exam. No calculators allowed: multiple choice: (30 pts, 3 points each) carefully and clearly circle the best answer. Short answer and calculations (80 pts): clearly indicate your answer in the space provided. Partial credit will be given for correct work. If i cannot read the work, it will not be graded: (10 pts) please indicate whether or not the following orbitals can exist. (y or n, 3s. _______________: (5pts) what two properties of electrons make it impossible to pinpoint their exact location? (the. Heisenberg uncertainty principle: ________________________________________, ________________________________________, (10 pts) write the noble gas electron configurations for the following atoms or ions and determine whether they are diamagnetic or paramagnetic, sc, cr. Polar or nonpolar: ___________________ (5 pts) describe the bonding in the following molecule and indicate whether it is cis or trans. 4: (10 pts) in chapter 6, we discussed how radiation interacts with the earth"s atmosphere.

Related Questions

A--Galena (also known as lead (II) sulfide) is the ore from which elemental lead is extracted. In the first step of the extraction process, galena is heated in oxygen to form lead (II) oxide and sulfur dioxide.

--Write a balanced equation for the reaction. (2 points)
--What mass of galena is converted to lead (II) oxide if 975 kJ of heat is produced? (3 points)

B--Tungsten(VI) oxide reacts with hydrogen gas (H₂) to produce tungsten metal and water vapor. The equations below represent the enthalpy change for the formation of the two compounds from their elements.

2 W (s) + 3 O₂ (g) ---> 2 WO₃ (s) ÎH = -1685.4 kJ

2 H₂ (g) + O₂ (g)---> 2 H₂O (g) ÎH = -477.84 kJ

--Write a balanced equation for the reaction. (1 point)

--What is the enthalpy change for the overall reaction written in (a)? (4 points)

C---An important step in the synthesis of nitric acid is the reaction of ammonia (NH₃) and molecular oxygen to form nitrogen monoxide gas and water vapor.

--Write a balanced equation for this reaction. (2 points)

--Calculate DH^o for this reaction, using standard heat of formation values from Appendix G in the Open Stax Chemistry text. (3 points)

D----When an electron in a 2p orbital of a particular atom makes a transition to the 2s orbital, a photon of approximate wavelength 629.1 nm is emitted. What is the energy difference between these 2p and 2s orbitals?

E---Provide a numerical value (whole number) for each of the following questions. Briefly explain your reasoning (1 point each).

How many electrons can be contained in all of the orbitals with n = 4?

Among the orbitals with n = 4 (see part a), which one has the highest energy and how do you know this?

What is the l quantum number for a 4s orbital?

How many electrons can be described by the quantum numbers n = 3, l = 3, m_l = 1?

l = 3, how many electrons can be contained in all the possible orbitals of a given principal quantum number?

CHEM 1110 Midterm: Chemistry 1110 2004 Spring Test 3

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