Chem Final Correct answers (Final exam cumulative of all tests) PDF

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The final is over all the exams put together. I created a document over the right answers. Hope it helps...

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EXAM 1B Question 1 Using the mass spectrum below and the following data: 55.8 % C, 11.6% H and 32.6% N by mass Determine the molecular formula of the particles of the substance.

Question 1 (Attempt 2) Using the mass spectrum below and the following data: 48.6 % C, 8.1% H and 43.2% O by mass Determine the molecular formula of the particles of the substance.

Question 1 (Attempt 3) Using the mass spectrum below and the following data:47.4 % C, 10.5% H and 42.1% O by mass Determine the molecular formula of the particles of the substance.

Question 2 Rank the mass of a sample of 5.4 x 10^21 particles of BrF3, SOCl2 and NCl3:

Question 2 (Attempt 1) Rank the mass of a sample of 8.5 x 10^22 particles of B2O3, P2O5 and AsO2

Question 2 (Attempt 3) Rank the mass of a sample of 3.2 x 1022 particles of CBrF3, CHFCl2 and CF3Cl

Question 3 Calculate the number of moles in 34.7 grams of C2H4O2

Question 4 Calculate the number of grams in 5.8 x1024 particles of C2H6O

Question 5 Different substances have different boiling points because their particles

Question 5 (Attempt 2) Different substances have different melting points because their particles

Question 6 Select the correct analysis for the following process:

Question 6 (Attempt 2) Select the correct analysis for the following process:

Question 7 Use the mass spectrum shown below to estimate the molar mass of the analyzed substance:

Question 7 (Attempt 2) Use the mass spectrum shown below to estimate the molar mass of the analyzed substance:

Question 7 (Attempt 3) Use the mass spectrum shown below to estimate the molar mass of the analyzed substance:

Question 8 An isotope of element X has 14 protons and 16 neutrons, select the correct representation of this isotope:

Question 8 (Attempt 2) An isotope of element X has 15 protons and 16 neutrons, select the correct representation of this isotope:

Question 9 Select the change(s) in pressure or temperature that could lead to the process represented in this image:

Question 9 (Attempt 2) Select the change(s) in pressure or temperature that could lead to the process represented in this image:

Question 10 Select the correct answer based on the phase diagram and ΔE vs Pressure (P) graph shown below corresponding to a process at constant temperature T = 200 K.

Question 10 (Attempt 2) Select the correct answer based on the phase diagram and ΔE vs Pressure (P) graph shown below corresponding to a process at constant temperature T = 200 K.

Question 11 The following PEC diagram represent the mixing of two substances. Which of the following statements is true about the two states involved?

Question 11 (Attempt 2) The following PEC diagram represent the mixing of two substances. Which of the following statements is true about the two states involved?

Question 12 Given the data provided, select the temperature range for which a mixture of the four substances would have to be represented as shown below:

Question 12 (Attempt 2) Given the data provided, select the temperature range for which a mixture of the four substances would have to be represented as shown below:

Question 12 (Attempt 3) Given the data provided, select the temperature range for which a mixture of the four substances would have to be represented as shown below:

Question 13 Identify the empirical formula for the compound with the mass composition and mass spectrum shown below 40.7% C, 8.5% H, 23.7% N, and 27.1% O

Question 13 (Attempt 2) Identify the empirical formula for the compound with the mass composition and mass spectrum shown below 32.9% C, 6.8% H, 38.3% N, and 21.9% O

Question 14 How many elementary substances are represented in this mixture?

Question 14 (Attempt 2) How many chemical compounds are represented in the gas phase of this mixture?

Question 15 In the mixture of substances shown below, select the particles that are expected to have the lowest average speed at 273 K.

Question 15 (Attempt 2) In the mixture of substances shown below, select the particles that are expected to have the highest average speed at 300 K.

Question 15 (Attempt 3) In the mixture of substances shown below, select the particles that are expected to have the highest average speed at 300 K.

Question 16 For the following two possible states of a substance, identify the conditions of pressure and temperature that would most favor the formation of state A (HINT: Build the PEC diagram for these states and use it to make your decision)

Question 16 (Attempt 2) For the following two possible states of a substance, identify the conditions of pressure and temperature that would most favor the formation of state B (HINT: Build the PEC diagram for these states and use it to make your decision)

Question 17 Select the path(s) that lead to changes in BOTH the average kinetic and potential energies of the particles that make up this substance:

Question 17 (Attempt 3) Select the path(s) that lead to changes in BOTH the average kinetic and potential energies of the particles that make up this substance:

Question 17 (Attempt 3) Select the path(s) that lead to changes in BOTH the average kinetic and potential energies of the particles that make up this substance:

EXAM 2A Question 1 What is the likely molecular formula of the molecular compound formed by combining silicon (Si) and fluorine (F) atoms?

Question 3 What type of transition is induced by the electromagnetic radiation absorbed by these substances?

Question 4 The mass spectrum and infrared spectrum for a substance with the molecular formula C3H6O2 are shown below. What is the likely structure of the molecules that make up this substance?

Empirical (A)

Question 5

If the energy of the electrons in atoms and molecules WAS NOT quantized, what would be observed experimentally?

Question 6 The following diagrams show the variation in the total energy (E) of two atoms as a function of the distance (d) between them. Which diagram represents the strongest and shortest chemical bond?

Strongest & longest

Weakest & Longest

Weakest & Shortest

Question 7 Which statement best describes why atoms are rarely found in the unbonded state (i.e., not bonded to other atoms)?

Question 8 Use the following data to determine which vibrational transition requires radiation with the longest wavelength to be excited. Pay careful attention to the quantities and units used to represent the properties of the radiation. (D)

Shortest

Least

Question 9 A molecular compound with the empirical formula CH2O produces the mass spectrum and infrared spectrum shown below. Which is the likely structure of its molecules?

Question 11 Which of the electronic transitions represented in the energy level diagram below will produce a line at the longest wavelength in an absorption spectrum? (D)

shortest & absorption (A)

Shortest & Emission(B)

Question 12 What is true about the kinetic energy (KE), potential energy, and total energy (TE = KE + PE) of an electron as it undergoes the transition represented in the image below? (B)

(A)

Which statement best describes why atoms are rarely found in the unbounded state? (i.e., not bounded to another atom)

What is TRUE when electrons are delocalized between two atoms and a chemical bond is formed?

EXAM 2B When a bond between two atoms is formed

What is true about the kinetic energy (KE), potential energy, and total energy (TE = KE + PE) of an electron as it undergoes the transition represented in the image below?

The energy level diagram of different atoms are shown below. Which atom has the electron moving at the lowest average speed?

EXAM 3A (All wrong)

EXAM 3B...