Temperature of an iron block decreases from 850C to 250C. Calculate the heat lost by the block with a mass of 1,200g. (heat capacity of iron=0.115cal/g. °C) O a 1,980 Calories 88,200 Calories 8,280 Calories 29,000 Calories Question 15 A cup of water will freeze at 0°C. Which statement best describes this phase change? O a Endothermic, energy is released. O b Exothermic, energy is released. Exothermic, energy is absorbed. Endothermic, energy is absorbed.

Q: A flask containing 43.21 mol of water is heated and the temperature of water increases from 25°C to…

A:

Q: 11. It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous…

A: Energy generated during one hour exercise = 5500kJ Heat of vaporization of water = 40.6kJ/mol Time…

Q: How much heat would need to be removed to cool 50.3 g of water from 25.6°C to -10.7°C? Csolid =…

A: Mass of water = 50.3 g In the conversion of water from 25.6 ◦C to – 10.7 ◦C there is following steps…

Q: Benzene has a boiling point of 80.1 °C, and a specific heat capacity of 1.8 J/g °C in the liquid…

A:

Q: you chop out a 500 g sample of ice out of the Red River when it –40°C outside, then you bring the…

A:

Q: 3. Is solid → liquid → gas an endothermic or exothermic process? Describe how this energy change…

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Q: Calculate the amount of energy given off when 13g of water at 51° C freezes to ice at 0°C. Did a…

A: At 51°C , water is in liquid phase, so first there would be cooling of water from 51°C to its…

Q: A 25.0 g sample of benzene at 19.9 °C was cooled to its melting point (5.5 °C). How much heat was…

A: Introduction: Specific heat capacity:                                It is the amount of heat energy…

Q: 4. What is the minimum amount of ice at 0°C that must be added to the contents of a can of diet cola…

A: Heat released by diet cola = heat absorbed by ice  Heat absorbed by ice = heat required to transform…

Q: For mercury m.p. -39 degrees C                         b.p. 357 degrees C Heat of fusion 11.6 J/g @…

A: The amount of heat released in conversion of 20.0g of mercury vapor at 387degrees Celsius to liquid…

Q: 2. Calculate the amount of energy absorbed when 75g ice @ -4°C melts to 31°C. Did a phase change…

A: The change from -4°C to 31°C will have three process involved :  a ) Heating of ice from -4°C to 0°C…

Q: 91. An 8.5-g ice cube is placed into 255 g of water. Calculate the temperature change in the water…

A: mass of ice cube = 8.5 gm Mass of water = 255 gm Formula used  q = mC∆T and q= mHf From standard…

Q: Calculate the energy (in kJ) required to heat 0.491 grams of water from -46.0 ℃ to 142.5 ℃.

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Q: Calculate the energy (in kj) required to heat 0.382 grams of water from -47.4 Celsius to 136.1…

A: The given data contains, mass of water = 0.382 g. Temperature T1 = -47.4°C Temperature T2 = 136.1°C…

Q: 13. How much heat is absorbed if 45 grams of sweat is evaporated from someone's skin? AHvap for…

A: Given,  The heat is absorbed for evaporation of 45 grams of sweat from skin is: The DHvap = 2.41…

Q: Explain why each of these properties is important to sustaining life. Please use your own words and…

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Q: A0 682 mol sample of liquid propanol (60.09 g/mol) is heated from 25.6°C to 322.7°C. The boiling…

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Q: If the heat of fusion for water is 80. cal/g, how many calories are needed to melt 4.65 g of ice at…

A: Amount of Heat required to melt a solid into liquid is known as the Heat of Fusion. Its Unit is…

Q: The evaporation of water is endothermic:         H2O(l)  + 44.01 kJ   -------->   H2O(g)       If…

A: To find mass of water that will evaporate.

Q: Given that a 10.0 g sample of ice melts and then the resultant water proceeds to warm to 20.0 C,…

A: Given mass of ice = 10g Process 1: conversion of ice at 0 degree tp water at 0 degree The total heat…

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: . How much heat must be removed from 15.5 g of water at 90.0°C to cool it to 43.2

A: q=m.c.∆T q= heat  m=mass C.=heat capacity ∆T= difference in temperature

Q: How much energy is needed to convert 64.0 grams of ice at 0.00°C to water at 75.0°C?  Specific heat…

A: Given, Specific heat (ice)= 2.10J/(g°C) Specific heat (water)=4.18J/(g°C) Heat of fusion= 333J/g…

Q: If 1820 J of energy are used to heat 20.0 grams of water at 0.0°C, what will be the final…

A:

Q: Calculate the energy (in kJ) required to heat 0.491 grams of water from -46.0 °C to 142.5 °C.…

A:

Q: How much heat is needed to convert 325 g of water at  -18.0 °C to water at 100.0 °C?

A: Thermodynamics is branch of chemistry in which we deal with amount of heat evolved or absorbed by…

Q: Calculate how much energy it will take to heat 100 g of water from -20.0°C to 120°C. Given: ice =…

A: To solve the above question, use formula which contain q,m,c and ∆T, ∆H in it for different changes.…

Q: You may want to reference Section 3.7 (Pages 80-87) while completing this problem. Using the values…

A: Condensation:- Condensation is a process of converting water vapor to water. This process is the…

Q: Use the following values to answer each part. The specifi c heat of water is 1.00 cal/(g · °C); the…

A: It is given that,Cp = 1.00 cal/g · °C  ΔHfus = 79.7 cal/g ΔHvap = 540 cal/g

Q: Benzene has a boiling point of 80.1 °C, and a specific heat capacity of 1.8 J/g °C in the liquid…

A: The heat released in the cooling of any substance in the same phase is given by the following…

Q: Calculate the heat released when 65.5g of water at 55.5 ° C cools to ice at 0.0 ° C. (Given that the…

A: Here we are required to find the heat energy released during freezing process

Q: Suppose you put four 150-mL bottles of water into an ice chest filled with crushed ice. If the…

A: Volume of 1 bottle = 150 mL Number of bottles = 4 Volume of water = 150 × 4…

Q: Question 8 of 28 Submit How much heat (in kJ) would need to be removed to cool 213.5 g of water from…

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Q: How much energy must be absorbed by 20.0 g of water to increase its temperature from 283.0 °C to…

A: The answer is given as follows

Q: Calculate the amount of heat needed to raise the temperature of 55.0 g of liquid water from 25°C to…

A: The mass of liquid water is = 55.0 g The initial temperature of the liquid water is = 25°C The final…

Q: Some physical properties of water are shown below. melting point 0.0°C boiling point 100.0°C…

A: Mass of water = 16.3 gWater temperature = 80 oCSpecific heat of water = 4.184 J/goCSpecific heat of…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.