# The heat capacity of a substance is the heat required to raise the temperature a unit degree

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Specific heat capacity

specific heat Capacity

EQ: What is specific heat capacity?

• We will demonstrate understanding how to measure for specific heat.
• I will evaluate the relationship of the variables for the specific heat capacity equation by illustrating the equation

## Heat Capacity

The heat capacity of a substance is the heat required to raise the temperature a unit degree.

Glass

Al

Copper

Iron

Heat capacities based on time to heat from zero to 1000C. Which has the greatest heat capacity?

37 s

52 s

60 s

83 s

90 s

1000C

1000C

1000C

1000C

1000C

specific heat capacity

Glass

Al

Copper

Iron

Iron and copper balls melt all the way through; others have lesser heat capacities.

All at 1000C placed on Paraffin Slab

Glass

Al

Copper

Iron

specific heat capacity

## specific heat

• Some objects are easier to heat than others.
• When heat flows into an object, its thermal energy and temperature increase.
• The amount of the increase in temperature depends on the size of the object, and on the material from which the object is made.

## PHASE CHANGES

• The specific heat capacity will change depending on the state of matter.
• Temperature remains constant until the phase change is complete.

specific heat

Condensation

Vaporization

Freezing

Melting

Q

liquid

gas

solid

specific heat

 Quantity Variable Unit Heat energy absorbed/released Q Joules (J), KiloJoules (kJ), Calories (cal) Specific heat c J/kg*K, kJ/g*˚C, J/kg*˚C mass m kg temperature T K, ˚F, ˚C

## specific heat

• Liquid water has a high specific heat compared to the specific heat of other substances.

A mass of 1 kg of water requires 4180 J of energy to increase its temperature by 1 K. The same mass of copper requires only 385 J to increase its temperature by 1 K.

## What quantity of heat is required to raise the temperature of 450 grams of water from 15°C to 85°C? The specific heat capacity of water is 4.180 J/g/°C.

450 g

The heat required to do this job is:

specific heat example

## How much energy must be absorbed by 20.0 g of water to increase its temperature from 283.0 ⁰C to 303.0 ⁰C ? Use the specific heat of water in Joules.

• How much energy must be absorbed by 20.0 g of water to increase its temperature from 283.0 ⁰C to 303.0 ⁰C ? Use the specific heat of water in Joules.
• ## 2. If it takes 41.72 J to heat a piece of gold weighing 18.69 g from 10.0 ⁰C to 27.0 ⁰C. What is the specific heat of gold in J/kg. ⁰C?

specific heat example

• You are in charge of developing a tattoo to allow the world to know about “Specific Heat Capacity”
• The center of the tattoo must be the equation
• The surrounding artwork (minimum of 4 colors) must demonstrate the equation’s concept in a real-life situation.
• The artwork must be suitable for all ages and appropriate for viewing in all social situations
• A 5 sentence paragraph explainingg how the artwork represents the equation or “Specific Heat Capacity”

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