Name: CHEMI211- Thermochemistry Project Worksheet S: Specific Heat The original

Question

Name: CHEMI211- Thermochemistry Project Worksheet S: Specific Heat The original unit for heat was the calorie. The calorie was defined as the quantity of heat This unit voa to raise the tem of the temperature of one gram of water by one Celsius degree. However, since 1960 with the a on the International System of Units (SI the unit for all forms of energy is the joule Joule an English physicist in the 1800's who made many quantitative is therefore measured in joules or in calories, 1 relationship of heat and mechanical work. Heat energy calorie- 4184 joules. with a capital C and energy although calories are The calorie that is commonly used to measure food energy is written correctly as Calorie is actually 1000 calories or a kilocalorie. Most modern work uses joules as the unit for somctimes seen. Of course, kilojoules (kJ) (one thousand joules) and kilocalories one another in the amount of heat needed to raise their temperature. The corresponding rise in temperature is called the heat capacity of the body. That is, tone thousand calories) are used for larger amounts of energy Substances differ From ratio of the heat required to its heat capacity for substance is heat about the ratio of the heat required per of heat of a substance is the heat required per energy change in temperature However, it is much more useful to talk a substance is the r gram of material to its corresponding rise in temperature. The specific heat for an eleram per degree. The units for specific heat are Joules/gram a compound is constant (for the same state) and is useful f the material. degree information when studying the bonding, structure, and uses o Specific Heat of Water 1.00 cal'e "C or 4.184 Jg'C Questions I. The standard unit for energy is the 2. is the amount of heat to warm one gram of a substance one Celsius degree 3. A container of low-fat yogurt contains about 150 Calories. What are the Calories really measuring? 4. How many joules are in I kilojoule? s. When you get into a parked car in the summer time, the metal clip on the seatbelt is often too hot to touch, while the seatbelt fabric is not. What has a higher specific heat, the metal clip or the seatbelt fabric? Explain your answer using the definition of specific heat 6. We could generalize the question above by saying that substances with a high specific heat get hot (faster/slower) than objects with a low specific heat. For simple calorimetry problems we use the formula: Heat = (mass of sample) X (specific heat of material (change in temperature) Using symbols we can write this: Usually books do not use signs for calculating whether the heat was absorbed or released but instead simply label the heat energy as joules absorbed or joules released depending upon whether the temperature went up or down. Esamplel #juules= 1001 x 41841 Calculate the number of joules ne led to warn 100 grams of water from 25.0'C to 80.0 c x (rar,-2sde " (100)(4. 184)(55.01-23,012 Jon(2.30 x 10. J needed

Explanation / Answer

Ans 1 : Joule

The SI unit of energy is joule

Ans 2 : Calorie

calorie is the amount of heat required to raise the temperature of 1 gram of water 1 degree celcius.

Ans 3 :

The calories of yoghurt measure the amount of food energy present in it.

Ans 4 : 1 kilo joules = 1000 joules

So there are 1000 joules in one 1 kilo joule

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