How is heat generated? The Universe is made up of matter and energy. Matter is made up of atoms & molecules. Energy causes the atoms & molecules to always.

Slides:

Advertisements

Similar presentations

Physics 1025F Heat & Properties of Matter

Advertisements

1 Energy and Heat It Is All Around You…. 2 You have heard the word “ENERGY” before, but how is it defined by a scientist? Energy is defined as “the ability.

 Energy is transferred ◦ Exothermic – heat is released  Heat exits ◦ Endothermic – heat is required or absorbed by reaction  Measure energy in Joules.

Aim: What is thermochemistry?. Law of Conservation of Energy In any chemical or physical process, energy is neither created nor destroyed. There are different.

Cornell notes about heat and how heat transfers

Energy Energy is the ability to do work or transfer heat. Units of Energy: -Joule (J) 1 J = 1 kg-m 2 / s 2.

Food and Energy The Basics of Heat Transfer. The Flow of Energy Thermochemistry - concerned with heat changes that occur during chemical reactions.

Heat Thermal Energy Thermal Energy Thermal Energy.

Unit 1.  Energy is the ability to do work or produce heat  Thermodynamics is the production of heat.

U3g - L1 Copy these sentences in your notebook. Fill in the blanks using the terms below: 1._______ is the transfer of heat by movement of a fluid. 2._______.

Chapter 17 Energy in Thermal Processes: First Law of Thermodynamics.

Temperature & Heat. Kinetic Molecular Theory Matter is composed of tiny particles – Atoms – Molecules The particles of matter are in constant random motion.

Thermal Energy & Heat Physical Science Chapter 6.

You did work against friction, where did the energy go?

Thermal Energy Thermal Energy: The total internal Energy Internal Energy: The sum of the kinetic and potential energies of the internal motion of particles.

Physics 101: Lecture 25, Pg 1 Physics 101: Lecture 25 Heat Today’s lecture will cover Textbook Chapter Final.

Heat, Temperature, and Internal Energy

Unit 1.  Energy is the ability to do work or produce heat  Thermodynamics is the production of heat.

The higher the temperature of a substance, the faster is the motion of its molecules Temperature.

Investigation One.  The term used to describe the total of all the energy within a substance.  Heat is also known as thermal energy.  Includes both.

HEATHEAT TEMPERATURE. WHAT YOU SHOULD KNOW A WARMER OBJECT CAN WARM A COOLER OBJECT BY CONTACT OR FROM A DISTANCE.

Unit 3: Kinetics and Thermodynamics. The capacity to do work or produce heat Makes objects move Makes things stop Energy from sun plants foods we eat.

Lecture: Heat. What is heat? What is the unit for heat? Does the amount of energy of a heated steel nail equal the energy of a heated aluminum nail?

Heat, Temperature, Heat Transfer, Thermal Expansion & Thermodynamics.

Chapter 19 Heat and the First Law of Thermodynamics 19-1 Heat as Energy Transfer 19-2 Internal Energy 19-3 Specific Heat 19-4 Calorimetry 19-5 Latent Heat.

Lecture 24Purdue University, Physics 2201 Lecture 24 Heat PHYSICS 220.

Vocabulary thermal energy Heat calorie specific heat

CHAPTER 4 ENERGY Energy changes With all motion energy is required. When an object moves it has Kinetic energy (motion). When an object is standing still.

Matter in Motion The molecules that make up matter are in constant motion. These molecules have kinetic energy.

APHY201 10/1/ Heat as Energy Transfer   Energy transferred between objects due to a temperature difference Units: calorie, Calorie (food),

14 Heat, Specific heat, and Latent heat

Chapter 10 Heat 10-1 Temperature and Thermal Equilibrium.

Aim: What is thermochemistry?

Aim: What is thermochemistry?

DO NOW Get out Work and Machines handout (#2)

Chapter 5 “Energy & Energy Resources”

Energy Transformations

When an ice cube melts, it gains thermal energy.

Physics Unit 5: Heat and Temperature

Heat Transfer NOTES.

Temperature, Heat, Work Heat Engines

Lecture 2 Heat, Expansion

Physical Science Chapter 6

HT1 01 – Introduction to Energy, heat, and temperature

Chapter 5 “Energy & Energy Resources”

Prof. Marlon Flores Sacedon

Prof. Marlon Flores Sacedon

Chemistry – Oct 12, 2017 P3 Challenge – Do Now (on slips of paper today) 1. Convert 792 mmHg to kPa 2. Convert 287 K to C.

Changes in State (PHASE CHANGES)—Notes

Quantitative Energy Problems

Chapter 6: Thermal Energy

Heating and Cooling Curves

Practice Quiz Solutions

Unit 2 Heat and temperature.

Chemistry – Oct 18, 2018 P3 Challenge – Distinguish between a triple point and a critical point. Turn in States Phet Activity if not yet.

Chemistry – Oct 22, 2018 P3 Challenge – Distinguish between a triple point and a critical point. Turn in States Phet Activity if not yet Turn in PT Units.

Heat Chapter 6.

Heat and Heat Technology

All matter is made up of molecules and atoms

Warm up: copy this summary of yesterday’s lesson in your notes Thermal Energy vs. Temperature vs. Heat Thermal Energy Temperature Heat the total amount.

1.1.1 Thermodynamics Unit 1.

Energy 7a. Designing a diagram, model or analogy to show or describe the motion of molecules for a material in a warmer and cooler state. 7b. Explaining.

BY. LEAH LAWSON science 4.PERIOD

Unit 2 Heat and temperature.

What is the specific heat capacity of the metal?

When an ice cube melts it gains thermal energy

Presentation transcript:

How is heat generated? The Universe is made up of matter and energy. Matter is made up of atoms & molecules. Energy causes the atoms & molecules to always be in motion - either bumping into each other or vibrating back and forth. The motion of atoms and molecules creates a form of energy called heat or thermal energy which is present in all matter.

 It is the total energy of molecular motion in a substance. What is heat?  It is a form of energy transferred from one body to another body because of a temperature difference between bodies.  It is the total energy of molecular motion in a substance. Examples of Heat transfer a. If you touch a hot stove, heat energy enters your hand ( thus you feel hurt ) because the stove is warmer than your hand. b. If you touch a piece of ice, energy passes out of your hand and into the colder ice thus the ice melts.

What are the sources of Heat?  The Sun Most of our heat may be traced from the sun.  Earth’s Interior The earth’s interior is hotter than its surface.

Sources of Heat  Chemical Action Our food are cooked by the heat of burning wood or by LPG. The oxygen we breathe burns the food we eat. We get heat energy from the food we eat.

Sources of Heat Machines can be sources of heat  Mechanical energy Infrared image of a hair dryer Infrared image of light bulb  Electrical Energy

 Nuclear Energy Radioactive substances give off heat.  Friction When you rub your hands. When you use the brakes on your car.

What are the effects of Heat?  Change in temperature Heating water in the kettle http://images.search.yahoo.com/search/images?p=heat+transfer&ei=UTF-8&fr=yfp-t-500&b=21 Excessive heat in a feverish child

What are the effects of Heat?  Phase change Melting/Fusion – “heat releasing process” Vaporization – “heat absorbing process” Evaporation – “Cooling process” Condensation – “Warming process”  Expansion Change in Length or dimension Change in Volume

Amount of Heat (Q) to change the temperature Q = mct Where Q – heat to change temperature c – specific heat (constant)  t – change in temperature  t is in C c is in j/Kg C m is in kg Unit of heat: joules ( j ), calorie (cal) , British Thermal Unit ( BTU )

Specific Heat ( j/KgC ) Specific heat ( c ) of selected substances Substance Specific Heat ( j/KgC ) Aluminum 900 Silver 230 Water 4186 Zinc 388 Copper 390 Ice 2060 Lead 128 Iron 450 Steam 2020 Glass 837

Heat to change temperature Example 1: An 80-kg man has a fever of 2 C above the normal. Assuming that the human body is mostly water, how much heat must be removed from the body to eliminate the fever? Example 2:What is the heat required to raise the temperature of 0.5kg of ice from 0 C to 5 C?

Heat to change temperature Example 3: A 50g sample of copper is initially at 25 C. If 1200 joules of heat is added to the copper, then what is its final temperature? Example 4: A certain substance was heated from 50 C to 80 C. If 200joules of heat has been added to the substance that is 30g then what is its specific heat?

EXERCISE :Heat 1. A 80g piece of zinc is 35C. If 400joules of heat is added then what is its final temperature? 2. A certain substance was heated from 65 C to 90 C. If 110joules of heat has been added to the substance that is 50g then what is its specific heat? 3. How many joules of energy is required to raise the temperature of 300g of lead from 45 C to 120 C? 4. How many joules of energy is required to raise the temperature of 100g of iron from 20 C to 100 C? 5. A 50g piece of Aluminum is at 20 C. If 400joules of heat is added then what is its 6. A certain substance was heated from 65 C to 90 C. If 150joules of heat has been added to the substance that is 50g then what is its specific heat?