Read 10.1 to 10.3 After reading each section write one sentence summarizing the section. This will be turned in!

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Presentation transcript:

Read 10.1 to 10.3 After reading each section write one sentence summarizing the section. This will be turned in!

Energy and Specific Heat Date:

What is the symbol for heat? q

Heat flows from a _____ object to a _____ object. Warmer; cooler

Heat is a form of… ENERGY

What is energy? The ability to do work.

Can energy be destroyed? NO! It is transferred! From high to low.

How do we calculate energy? Energy = mass * specific heat * temperature change q = m*s*  T  T = T f – T i

Chemical Potential Energy Energy stored in chemical bonds.

Specific Heat The amount of heat necessary to raise the temperature of one gram of a substance one degree Celsius. (Water’s specific heat is one cal). J/g o C cal/g o C Constants to know –Specific heat of water is 1 cal/g o C or 4.184J/g o C –1000 cal = 1 Cal (box top calorie)

Low specific heats will heat up and cool down FAST. High specific heats will take longer to heat up and longer to cool down.

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How much work do you have to do to work off a can of pop?? First figure Joules in can of pop. Then relate to Nm Calories in = calories.| J= | 1 calorie

Finding work 1 Joule = 1 Newton*meter Newton = mass * acceleration Acceleration due to gravity 9.8 m/s 2 1 Newton = X kg * 9.8 m/s 2 X = kg Lift 102 g 1 meter to expend 1 Joule of energy.

Since J of heat were used to raise the temperature of 160 g of wood to 150 o C, what was the original temperature of the wood? Specific heat of wood 1.8 J/g o C.

If -180 J of heat were released when the temperature of grain alcohol was lowered by 5 o C, how many grams of grain alcohol were present? (2 SF) Specific heat of grain alcohol 2.4 J/g o C.

How much heat in calories is necessary to raise the temperature of 163 g of silver 106 o C? Specific heat of silver 0.24 J/g o C (3 SF)

If 960 J of heat are added to 10 g of chloroform, what is the temperature change that will result? Specific heat of chloroform 0.96 J/g o C

If 1920 J of heat are used to heat 200g of silver to a temperature of 75 o C, what was the initial temperature of the silver? Specific heat of silver 0.24 J/g o C

If 4232 J of heat is used to heat 230 g of iron originally at 13 o C, what is the final temperature of the iron? Specific heat of iron 0.46 J/g o C

Beach check

Homework Solve equations using specific heat formula.