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, chemical formula or Lewis structure substance boiling point v (Choose one) 1 (highest) A HCI 2 H О — О —Н В 3 .. 4 (lowest) HgCl, |(Choose one) H, (Choose one) ♥ D ?

Which one of the following compounds has the highest boiling point? I II III IV V IV O H OH || V ||| OH

Based on the thermodynamic properties provided for water, determine the amount of energy needed for 2.00 kg of water to go from -16.0 °C to 69.0 °C. Property Melting point Boiling point AHfus AHvap Cp (s) Cp (1) Cp (8) kJ Value 0.0 100.0 6.01 40.67 37.1 75.3 33.6 Units °℃ °C kJ/mol kJ/mol J/mol. °C J/mol • °C J/mol. °C

Which diagram corresponds to pure methanol (CH3OH)? (The normal boiling point of methanol is 64.70°C.) O CH, но O CH, HO. O CH, он он

H2.

Which of the following compounds has the highest vapor pressure at 25°C? O acetic acid, boiling point- 118 C carbon tetrachloride, boiling point = 76.7 C Omethanol, boiling point- 65.0 C O pentane, boiling point = 36.1 C O ethanol, boiling point= 78.7 C

Consider the melting points of the substances below (see figures for two compounds). Explain the trend in melting point using your knowledge of intermolecular forces. (In the structures below, carbon is black, hydrogen is white, and oxygen is red.) Substance Melting Point (°C) Molar Mass (g/mol) Cl2 −102 71 Ethyl formate (CH3CH2OCHO) −80 74 Propionic acid (CH3CH2COOH) −20 74 Br2 −7.2 160

Calculate the amount of heat needed to raise the temperature of 55.0 g of liquid water from 25°C to 99°C. The specific heat of liquid water is 1.00 cal/g °C

Please don't provide handwritten solution ....

A pure sample of Substance S is put into an evacuated flask. The flask is then heated steadily and the temperature measured as time passes. The results are graphed below, in the middle (in green). Identical experiments are now run on Substance Y and Substance Z. Substance Y is just like S except that it has a higher heat capacity in the solid phase C₂ (s). Substance Z is just like S except that it has a lower enthalpy of vaporization H. Select the graphs below, on the left and right, that show the results you expect for these new experiments. Substance Y •C₁ (s)) (higher Cp (Drag the slider to choose an image) temperature (°C) Substance S added heat (kJ/mol) Substance Z (lower H₂) (Drag the slider to choose an image) ³ 5