OCHEM Lab report 1

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40L31-22SP / Week 8: Experiment 8- Designing Hot and Cold Packs/ Experiment Fill in the blank with the correct words: Energy is to break a bond and when a bond forms. required released

need help finding the kj

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, substance chemical formula boiling point or Lewis structure H H H A H – C C - C -0 H (Choose one) ▼ | H H Ag (Choose one) В Ar |(Choose one) - H :0: H Н— С — С С — Н (Choose one) v H. ? :0 : I - O - T

What is the energy of one mole of photons having a wavelength of 550 nm and also find 2.045 g of a new compound with formula C9H8O2 is burned in a bomb calorimeter.  During the combustion, the temperature of the calorimeter increases from 21.811 °C to 29.551 °C. [During calibration, the heat capacity of the calorimeter was found to be 11.75 kJ·°C-1.]  What is ΔUcomb for this compound in kJ/mol?

Why is kinetic information, in addition to the thermodynamic information provided by enthalpy and entropy, needed to complete our understanding of atmospheric chemistry? Gibbs free energy involves both enthalpy and entropy. Briefly describe the relative roles of the change in enthalpy and entropy in affecting the equilibrium state of a chemical system.

A model for the compound 2,2- dimethylbutane is shown. Write a balanced chemical equation that shows the formation of 2,2-dimethylbutane from the elements carbon (C) and hydrogen). (Use the smallest integer coefficients possible and do not include states.) A model for the compound 2,2-dimethylbutane is shown Write a balanced chemical equation that shows the formation of 2,2-dimethylbutane from the elements carbon (C) and hydrogen (H₂) (Use the smallest integer coefficients possible ond do not include states.)

Consider the table. Metal Tm (K) AĦfus (kJ/mol) |Tp (K) AH vap (kJ/mol) Li 454 2.99 1615 134.7 Na 371 2.60 1156 89.6 K 336 2.33 1033 77.1 Rb 312 2.34 956 69 Cs 302 2.10 942 66 Using the data, calculate ASfus and ASvap for K. AS vap J 77.51 K-mol Incorrect J AS fus = 7.0080 %3D K-mol

When a hot block is placed next to a cold block the two blocks end up at the same temperature. Explain how both this happens (what molecular motion is happening and the direction and flow of energy) and why this happens (what is driving this and why it will not reverse)  *****talk about quanta

The bond dissociation energy to break 4 C-H bond(s) in 1 mole of ethanol (CH₃CH₂OH) molecules is

The bond dissociation energy to break 5 C-H bond(s) in 1 mole of glycerol (HOCH₂CH(OH)CH₂OH, see image below) molecules is N O Single Bond H H 432 411 386 459 O NO I C Multiple Bonds с 346 305 167 358 201 142 C=N 615 C=N 887 **All values in kJ/mol** C=C 602 C=O 799 C=C 835 C=O 1072 0=0 494 N=N 942

please do a,c,d. and a ,  about the Br-Br bond it should have a total of 5 bonds on the reactant side.  For C, look at the number of polar/nonpolar bonds to decide enthalpy. For D, use the total number of molecules on each side.

Consider a system of two atoms with a stable interaction between them (the atoms are stuck in the bottom of the potential energy well). The potential energy curve for this system is shown to the right. What would happen to the system for the potential energy to change from Y to Z? th Z PE I.A third atom from the surroundings would collide with the system. II.Energy would transfer from the surroundings to the system. III.Energy would transfer from the system to the surroundings. IV.The interaction between the atoms in the system would be formed. V.The interaction between the atoms in the system would be overcome. O ll only O I, III, and V O V only O I, II, and V O I, II, and IV

The heating of CuSO4. 5H2O(S) yields several transitions as a function of temperature. The table below gives the percentage of original mass lost as a function of the approximate temperature. Use these percentages to determine the sequence of decompositions and write chemical equations for each transition. percentage of original mass lost 14.5 29.0 36.0 51.5 67.0 70.5 approximate temperature (Degree C) 100 130 220 800 910 1020

Use average bond energies to compare the stabilities of allyl alcohol, CH2CHCH2OH, and acetone, (CH3)2CO, both of which have the same formula, C3H6O. What is the difference in stabilities of the two compounds? Give the absolute value of the difference (positive value). kJ eTextbook and Media Select all that apply to the stability of allyl alcohol and acetone. O Allyl alcohol is more stable than acetone. Acetone is more stable than allyl alcohol. Allyl alcohol is more stable due to difference in stabilities. O Acetone is more stable due to difference in stabilities.

A heating curve for methanol is shown in the attached image. The horizontal lines are areas where: Choose ONE: the student fell asleep the experiment is paused the system reaches equilibrium sublimation occurs all added energy disrupts IMF

A microwave using 18.99cm IR radiation is used to heat 18.2g water from 18.8C to 71.2C.   Find the number of MOLES of photons required to accomplish this task.

please solve 74

What is the symbol for energy/heat flow in the field of thermochemistry?

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