Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine Problem 1
A fruit-and-oatmeal bar contains 142 nutritional Calories. Convert this energy to calories.
Problem 2
An exothermic reaction releases 86.5 kJ. How many kilocalories of energy are released?
Problem 3
Challenge Define a new energy unit, named after yourself, with a magnitude of one-tenth of a calorie. What conversion factors relate this new unit to joules? To Calories?
Problem 4
If the temperature of 34.4 \({g}\) of ethanol increases from \(25.0^{\circ} {C}\) to \(78.8^{\circ} {C}\) how much heat has been absorbed by the ethanol? Refer to Table 15.2.
Problem 5
A 155-g sample of an unknown substance was heated from 25.0掳C to 40.0掳C. In the process, the substance absorbed 5696 J of energy. What is the specific heat of the substance? Identify the substance among those listed in Table 15.2.
Problem 6
Challenge A 4.50-g nugget of pure gold absorbed 276 J of heat. The initial temperature was 25.0掳C. What was the final temperature?
Problem 7
Explain how energy changes from one form to another in an exothermic reaction. In an endothermic reaction.
Problem 8
Distinguish between kinetic and potential energy in the following examples: two separated magnets; an avalanche of snow; books on library shelves; a mountain stream; a stock-car race; separation of charge in a battery
Problem 9
Explain how the light and heat of a burning candle are related to chemical potential energy.
Problem 10
Calculate the amount of heat absorbed when 5.50 g of aluminum is heated from 25.0潞C to 95.0潞C. The specific heat of aluminum is 0.897 J/(g?潞C)
