39 Answered Questions for the topic Heat


How many joules of heat must be transferred to a 420-g aluminum pizza pan to raise its temperature from 22°C to 232°C?

How many joules of heat must be transferred to a 420-g aluminum pizza pan to raise its temperature from 22°C to 232°C? The specific heat of aluminum in this temperature range is 0.90 J/g·°C. Show... more


Which of the following are identical amounts of energy?

1kJ and 1 kcal1kJ and 239 cal1kJ and 1 Cal4.184 J and 1 kcal

Use Hess's Law to calculate the heat of reaction for the following reaction :

A + 3B —> 3C + 2DA + 28 —> C+ D H= -20 kJ B —> 2C+ D H= -45 kJ (ANSWER CHOICE )a. -65 kJb. +65 kJc. -25 kJd. +25 kJ

A 1.7g potato chip is burned down to 0.2g in a calorimeter that contains 400.0 g of water

The temperature of the water rises from 21°C to 31°C. The specific heat of water is 1cal/g^ C . How much heat in cal was given off in the reaction?A. 2.7 calB. 4000 calC. 4 calD. 15 cal


Can heat be considered a force

Assume an ideal gas molecule being subjected to heat from the sun, it experiences a change in momentum, can we assume that the force supplying this form of energy is heat?
Heat Chemistry


How do I find the heat of combustion of the unknown hydrocarbon?

When 0.0801 mol of an unknown hydrocarbon is burned in a bomb calorimeter, the calorimeter increases in temperature by 2.19°C. If the heat capacity of the bomb calorimeter is 1.229 kJ/°C, what is... more


How much heat is involved in changing 88.2 g S from 111 degrees celsius to 119 degrees celsius?

10th grade heat/joules/chem problem. endothermic chemistry problem


How many calories are required to change 17.5 g H2O from 27 degrees celcius to ice at 0 degrees celsius?

Chemistry heat exothermic question. Calories/ water.

Ap Chem question

How many kilojoules of heat are absorbed when 1.25 mol  is converted from liquid at 15.0℃ at vapor at 25.0℃? The specific heat of  (l) is 4.18 J/g℃. The heat of vaporization of water is 44.0... more

When does the entropy usually increase?

Some of the answers are below, maybe you can help by answering which one's correct? A. Molecule broken into two or more. B. Reaction results in increasing in No. Of gas moles. C. solid changes... more


Specific Heat

When 23.6 g of calcium chloride were dissolved in 300 mL of water in a calorimeter, the temperature of the water rose from 25.0 degree celsius to 38.7 degree celsius. What is the heat energy change... more


Heat Equation

How much heat energy is required to completely change 25 grams of ice at 0 degree Celsius to water and raise the temperature to body temperature (37 degree Celsius)?


I need the answer to this problem and steps!

Sodium metal is sometimes used as a cooling agent in heat exchange units because of it's relatively high molar heat capacity of 28.2 J/mol C. what is the specific heat of sodium in J/g C? 


I need the answer to these three problems. I need the steps to these problems! Someone help please!

When 25mL of 1.0M H2SO4 is added to 50mL of 1.0M NaOH at 25c in a calorimeter, the temperature of the aqueous solution increases to 33.9C. Assuming that the specific heat of the solution is 4.18J/g... more


Recommended that temperature stay below 135F. Temperature (T) Minutes after begin operation (x) modeled by T = -0.005x^2 + 0.45x + 125

Tell whether the temperature of the part will ever reach or exceed 135F. Use discriminant of a quadratic equation to decide. Part 2: If machine is in operation for 90 minutes before turning off,... more

Calculating Enthalpy in a Calorimeter Experiment

When 25.0 mL of 1.0 M H2SO4 is added to 50.0mL of 1.0M of NaOH at 25.0 degrees C in a calorimeter, the temperature of the aqueous solution increases to 33.9 degrees C. Assuming that the specific... more


Do you think that potassium could be detected visually in the presence of sodium by heating this mixture in a flame?

In a flame test experiment, sodium gives the brightest and most persistent color in the flame. Do you think that potassium could be detected visually in the presence of sodium by heating this... more


Really need clarification for this.

in a thermal pot, there is a layer of vacuum in the outer wall, an inner pot lid and an outer pot lid.    Please help me to clarify these questions:     1. Does hot food radiate heat? Or does... more


State of Matter Change

State Change: Liquid to Solid. Name: Freezing. Energy: Less. Particle Motion: Slower. Heat: Released.   State Change: Gas to Liquid.    State Change: Gas to Solid.   State Change: Solid to... more

Heat needed? Energy needed?

a. Calculate the amount of heat needed to warm 24.6 kg of water from a room temperature of 20.0°C to 60.0°C for use in a dishwasher.b. If the water heater has an efficiency of 61%, how much energy... more


Heat transfer between metal and water, what amount of water is boiled?

You place a very hot piece of aluminum (T=120 degrees C, c=900 J/(kg*degrees C) into a 500ml beaker of water that is already at an initial temperature of 90.0 degrees C. The mass of this piece of... more


find the mass that was burned

C2H6 + O2→CO2 + H2O. The heat from this reaction vaporized 20 grams of water. What mass of C2H6 was burned?


find the final temperature

4 grams CaCl2 is dissolved in 40 grams of water at 1 degree C. Find the final temperature of the water. 


heat of formation

Write the heat of formation equation for: A) NaCl B) NaOH C) C2H6 D) NO2

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