Do Now On your Daily Organizer, answer the

following questions under Do Now. We defined temperature as “simply the

reading on a thermometer”. Based on the lesson Monday, what is one other good but not complete definition of temperature?

What is heat? Give an example of a transfer of energy

through heat.

Today’s Agenda5

min• Do Now

5 min

• Important Dates15 min

• Quantity of Heat25 min

• Specific Heat 5

min• Exit Ticket

Today’s Agenda5

min• Do Now

5 min

• Important Dates15 min

• Quantity of Heat25 min

• Specific Heat 5

min• Exit Ticket

Important Dates & Reminders Quiz Friday

5 multiple choice questions over temperature & heat

Homework Should Be In Bin Lab Notebooks Due Next Friday Homecoming Week

Today is CELEBRITY DAY!!! Also, come to the Teacher vs. Student

Game Teachers WILL win

Today’s Agenda5

min• Do Now

5 min

• Important Dates15 min

• Quantity of Heat25 min

• Specific Heat 5

min• Exit Ticket

What is Temperature? Temperature is simply the reading on a

thermometer. Other good but not complete definitions:

The degree of hotness or coldness of a body or environment.

A measure of the average kinetic energy of the particles in a sample of matter, expressed in terms of units or degrees designated on a standard scale.

What does temperature measure? Temperature is a measure of the

average kinetic energy of the particles within a sample of matter.

When the temperature of an object increases, the particles that compose the object begin to move faster. They either vibrate more rapidly, rotate

with greater frequency or move through space with a greater speed.

A thermometer is kind of like a speedometer!

Heat is the flow of energy

Temperature vs. Heat

Measure of the hotness/coldness and the kinetic energy

Transfer of energy from hot object to cold object

Temperature Heat

Closer Look at Heat What We Know

Heat is the transfer of energy from one thing to another because of a temperature difference (one is considered hot and one is considered cold)

Nothing actually HAS heat – everything has kinetic energy. Heat is the energy that is being transferred.

Heat never flows from cold to hot. It always flows from HOT TO COLD.

What We Need to Find Out How much heat is transferred

Depends on temperature difference and amount of material

The unit of heat is defined as the energy necessary to produce some standard change. The most commonly used unit for heat is the calorie.

Quantity of Heat

Calorie The calorie is defined as the amount of

heat required to change the temperature of 1 gram of water by 1 Celsius degree.

What you see on the ratings of food and at the gym is actually measured in kilocalories.

Since we know that heat is a form of energy, what is the unit we usually use to measure energy?

Calorie The calorie is defined as the amount of

heat required to change the temperature of 1 gram of water by 1 Celsius degree.

What you see on the ratings of food and at the gym is actually measured in kilocalories.

Since we know that heat is a form of energy, what is the unit we usually use to measure energy? Joules

1 calorie = 4.187 J

So what does heat do? Heat changes the temperature of

objects. If heat is transferred from an object to the

surroundings, then the object can cool down and the surroundings can warm up.

When heat is transferred to an object by its surroundings, then the object can warm up and the surroundings can cool down.

Heat affects the kinetic energy of the objects because it changes the temperature.

Today’s Agenda5

min• Do Now

5 min

• Important Dates15 min

• Quantity of Heat25 min

• Specific Heat 5

min• Exit Ticket

Before we go into what exactly the definition of specific heat is, I am going to perform a couple demonstrations for you to start the thinking process. Make your predictions of what you think will happen!

Specific Heat Demos

Specific Heat Have you ever noticed that some foods stay

hotter much longer than others? Different substances have different abilities

to store energy. The specific heat of a substance is defined as

the quantity of heat required to change the temperature of a unit of mass (like a gram or kilogram) of the substance by 1 degree. Metric Units: Joules/kilogram*Kelvin (J/kg*K). More commonly used units: J/g*°C.

Specific Heat Example The specific heat capacity of solid

aluminum (0.904 J/g/°C) is different than the specific heat capacity of solid iron (0.449 J/g/°C).

Which one has a greater specific heat capacity?

Specific Heat Example The specific heat capacity of solid aluminum

(0.904 J/g/°C) is different than the specific heat capacity of solid iron (0.449 J/g/°C).

Which one has a greater specific heat capacity? Aluminum This means that it would require more heat to

increase the temperature of a given mass of aluminum by 1°C compared to the amount of heat required to increase the temperature of the same mass of iron by 1°C.

Now that we know more about what specific heat is, we can explain why the dollar bill did not burn and why the balloon with air popped first.

Specific Heat Demo Analysis

Today’s Agenda5 min •Do Now

5 min •Important Dates

15 min •Quantity of Heat

25 min •Specific Heat

5 min •Exit Ticket

Exit Ticket Exit tickets are my daily way of seeing

whether or not you have understood the objectives we have gone over during class each day.

They are NOT be graded for accuracy but WILL be graded for completion so make sure you always try each and every question.

These exit tickets must be done silently and independently. If you violate this, you will lose your participation points for the day.