12. Use the heating-cooling curve below to answer the following questions. a. What is the freezing point? b. What is the boiling point? c. Which is greater, the heat of fusion or the heat of vaporization? Explain each term and explain how the heating/cooling curve above helps you to answer the question. 140 120 boiling point 100 80 60 40 20 frecezing point Heat added at a constant rate Temperature (°C)

Q: What quantity of heat in kJ is required to melt 2kg of iron? The temperature increases from 1809°C…

A:

Q: How much heat is necessary to melt 12.8 g of solid gold? The heat of fusion of gold is 15.3 cal/g.

A: Given,mass of the solid gold = 12.8 gThe heat of fusion of gold = 15.3 cal/g

Q: A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady…

A: The temperature at which solid change into liquid is called melting pointThe temperature at which…

Q: How much heat is required to melt 23.9 g of solid diethylether (at its melting point)?

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Q: H,C CH H,CO. CH2 CH2 CH H2C FCH2 но H,C CH2 Compound A MM: 164.2 g/mol Compound B MM: 162.19 g/mol…

A: A question based on properties of liquid that is to be accomplished.

Q: observation question Which has a higher vapor pressure? At 1 atm pressure, Substance E Substance E…

A: The boiling point of a compound is the temperature at which vapor pressure of liquid equal to the…

Q: How much heat in kJ is required to convert 916 g of ice at-11.0°C to liquid water at 99.0°C? 706

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Q: Which of the following substances would have the lowest vapor pressure at 298K?   A. Acetone…

A:

Q: What amount of ice must be added to 540.0 g of water at 23 deg * C to cool the water to 0 deg * C…

A: Answer: This question is based on conservation of energy where heat lost by water will be equal to…

Q: Match process with the description A. change from a gaseous state to a liquid state v freezing v…

A: We have to match the processes with the described correct  description by the knowledge of phase…

Q: If water has the highest latent heat of vaporization, why does a drop of alcohol make my hand feel…

A: latent heat of vaporization is the heat required to convert the one mole of liquid at its boiling…

Q: Which substance is held by dipersion force? a. Cu wire  b. dry ice  c. ice  d. salt

A: Introduction :  Crystalline solids can be classified on the basis of nature of the intermolecular…

Q: Which liquid would have the highest vapor pressure at 25 degrees Celsius?  a. CH3-OH b. CH3-O-CH3…

A: Since, Vapour pressure calculate in terms of intermolecular forces. More the intermolecular forces,…

Q: What process is occurring betweenpoints C and D?

A: Below 00C,  exists in solid form (ice). At 00C, both solid form of water and its liquid form are in…

Q: how much heat you need to add to melt a block of 15.0 g of ice at 0 C? the heat of fusion of ice is…

A: Molar heat of fusion or enthalpy of fusion is defined as the amount of heat required to convert one…

Q: For numbers 7-8, refer to the figure below. 95 90 85 80 75 70 65 60 55 Region I Region II Region III…

A: Answer: This question is based on the cooling pattern of the substances. In region-I temperature of…

Q: how much heat does it take to melt 76.5 g, heat of fusion is 49.0 cal/g heat of vaporization is 1212…

A:

Q: Question attached

A: Boiling point = - 11◦C   In Kelvin = (- 11 + 273.15) K                 = 262.15 K

Q: If 8000 cal is needed to change the temperature of a certain amount of ice at -25°C to steam at…

A: Specific heat  of the substance of the  heat capacity of a sample of substance is divided by mass of…

Q: If we start with 10g of ice at -5°C and heat it until we have liquid water at 45°C, how much heat…

A: mass of ice = 10 g Initial temperature (Ti) = -5°C Final temperature (Tf) = 45°C Specific heat…

Q: Butane is a fuel that has a heat of vaporization of 24 kJ/mol. How much heat is needed to vaporize 5…

A: Given: The heat of vaporization of butane = 24 kJ/mol We have to calculate the amount of heat that…

Q: How much heat energy is required to melt 126.0 g of HBr? The molar heat of fusion of HBr is 2.41…

A: Given   mass of HBr = 126 gram  Molar Heat of Fusion    = 2.41 KJ/ mol  Energy required to melt 126…

Q: 3. Calculate the energy released when 10.g of water at 20.0°C are converted into ice at -10.0°C. You…

A: The energy required to change the temperature of a substance is given by the formula q = m × c × ΔT,…

Q: The graph represents the relationship between temperature and energy added to a substance. At point…

A: The question is based on the concept of chemical thermodynamics. we have been shown a heating curve…

Q: A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady…

A: the temperature versus the heat added curve is known as heating curve. from the curve we can…

Q: 5. The space-filling representation provided below is an example of a unit cell, which contains…

A: In primitive unit cell, the atoms are present on all the 8 corners of the cube. In body centered…

Q: observation question At any temperature where both substances are liquid, which has the higher vapor…

A: a) Given: enthalpy of vaporization of substance E is greater than that of substance F.

Q: Some chemistry students are trying to identify an unknown substance. They obtain the heating curve…

A: Heat versus temperature graph shows all states of any substance with all temperatures.

Q: The following information is for the substance carbon tetrachloride.  Heat of Fusion= 2.30 kJ/mol…

A:

Q: The heat of fusion for water is 80 calories / Gram in the heat of vaporization for water is 540…

A: Heat of fusion is the amount of energy which is required to convert ice into the water at the same…

Q: b. Using Excel or Google Sheets, graph In VP vs. 1/T. Let In VP be the ordinate (vertical axis).…

A:

Q: How much heat is necessary to melt 12.8 g of solid gold? The heat of fusion of gold is 15.3 cal/g.

A: The objective of the question is to calculate the amount of heat required to melt 12.8 g of solid…

Q: 150 100- D 50- -50 Time The heating curve shown above shows what happens as heat is added to a piece…

A: The heating curve describes the change in phase of a compound with respect to heat given to the…

Q: 3. Why does ice have a lower density than liquid water?

A: Ice has a lower density than liquid water due to the unique structure of water molecules and the way…

Q: The standard Enthalpy (AH•) of AgCl(s) is 296.0 J/mol . How much heat is needed to melt 18.3 g AgC?…

A: The given data: ΔH° (AgCl)  = 296.0 J/mol The mass of AgCl = 18.3 g To determine = The amount of…

Q: Use the observation in the first column to answer the question in the second column. observation…

A: Given the enthalpy of vaporization of substance C is higher than that of substance D.  Given…

Q: How much energy must be removed from 200 g of water beginning at 25 oC to convert it to ice cubes at…

A: Given : Mass of water = 200 g Initial temperature of water = 25 oC And final temperature of water =…

Q: G B A Energy 25. According to the heating curve above, what letter represents consensation? 26.…

A: Condensation is the process of transformation of physical state of matter from gas phase to the…

Q: How much heat must be added to a 2-kg block of ice at -5°C to change it to water at 10°C? C of ice =…

A: Specific heat capacity of water: 4.184 J/(g oC) Specific heat capacity of ice: 2100 J/(kg oC) Latent…

Q: How did you get the heat of vaporization ethanol & benzene?

A: •Here given:- 1) Solution of benzene 2) Solution of ethanol •Here both solution present at same…

Q: Mercury (Hg) has a heat of fusion of 23 kJ/mol. How much heat is needed to melt 4 mol of Hg?

A: we need to calculate the heat needed to melt 4 mol of Hg

Q: E D 40 20 100 80 60 A 40 6 8 10 12 14 16 18 20 22 Time onintes) 2.

A: The question involves  the concepts of heating curve. we have been Shown a heating curve of a…

Q: The boiling point of water at sea level is 100.00°C. calculate the amount of heat needed to vaporize…

A: Concept: q= m ×ΔH  where  q= heat (cal) m= mass (g) ΔH = enthalpy of vaporization in cal/g

Q: Draw the general shape of the temperature-energy graph for ethanol from: -200 oC to 100 oC. The…

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Q: Use the observation in the first column to answer the question in the second column. C J soft rosoft…

A: Enthalpy of vaporization also referred to as the (latent) heat of vaporization or heat of…

Q: How much heat is needed to melt 4.0 g of ice?

A: Asumming the ice is at 0°CThe latent heat of fusion if ice = 334 J/gMass of ice = 4g

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.