a) How do you call the technique used to determine the heat gained or lost by a substance during a chemical or physical change that  is based on the law of conservation of energy in an isolated system at constant presure and/or volume? b) Heat is _____ (added or released) to/by the solid at the melting point and remains constant until all of the solid melts.

Q: How many kilojoules of heat energy are required to melt 200. g of ice at its freezing point?

A:

Q: What is a phase change? Construct a heating-cooling curve for a substance that freezes at –23.0°C…

A: Answers are explained below.

Q: How much heat is required to heat 59.3g of liquid ethanol from -7*C to the vapor state at 78*C

A: Given,  Mass of liquid ethanol = 59.3 g.  Initial temperature = - 7 °C Final temperature = 78 ° C…

Q: A pure .e of Substance S is put into an evacuated flask. The flask is then heated steadily and the…

A:

Q: .5000 moles of steam at 200 degrees celsius was chilled in a ultra low temperature freezer to -90…

A: Given, moles of steam = 0.50 mol

Q: A 34.30 g sample of solid lead is initially at 314.00°C. If the sample is heated at constant…

A: Heat flow from high temperature to low temperature. Use formula q= mc(T2-T1)

Q: Determine the amount of energy necessary to raise 489 g of beryllium by 513 degrees Celsius. Report…

A: Given data,Mass of Beryllium=489gTemperature change (∆T)=513oCStandard data taken from…

Q: Calculate the amount of heat required to raise the tempature of an 91 g sample of water from 39C to…

A: Given: Specific heat of water = 4.18 J/g⋅∘C. Mass of water = 91 g. Initial temperature (T1) = 39 ∘C…

Q: The specific heat capacity of liquid ammonia is 4700J/Kg.K and its latent heat of vaporization is…

A:

Q: How much heat is needed to melt 10.0 grams of ice at -10°C until it is water at 10°C?

A: Given, mass of ice = 10.0 g Initial temperature (Ti) = -10°C Final temperature (Tf) = 10°C Amount of…

Q: Which change happens when a substance melts? O The molecules of the substance move farther apart,…

A: The correct option is as follows:

Q: If an object has a high specific heat, would it be more like a conductor or an insulator? Explain.…

A: To explain: The relationship between the specific heat of the material and its conductivity.

Q: A sample of C₃H₄Br₂ has a normal boiling temperature of 131.5 °C. The enthalpy of vaporization for…

A:

Q: How many kilojoules of heat energy are absorbed by a 200. g block of ice from -10 C to 0 C?

A: Solution-  Given Temperature-  00C to - 100C heat energy are absorbed by block of ice =200. g…

Q: Suppsoe that 1.02g of rubbing alcohol evaporates from a 55.0g aluminum block. If the aluminum block…

A: Given data, The molar mass of rubbing alcohol is 60.0 g/mol.

Q: Dry ice (solid carbon dioxide) disappears when allowed to sit at room temperature. What is the…

A: The physical state of Dry ice ( solid carbon dioxide) is solid and when we kept it at room…

Q: Heat is added to ice water at 0.C, you can expect the temperature of the ice water to…

A: Given : The phase of water is solid i.e its ice. And the temperature of ice is 0.0 oC

Q: It is a quantity of heat need to convert  a mole of liquid into gas phase at a specified…

A: Given: It is a quantity of heat needed to convert a mole of liquid into a gas phase at a specified…

Q: If you place a container of a mixture of liquid water and water vapor (the system) on a hotplate:…

A: Solutions- The process is called Boiling point of water.