Applying the Law of Conservation of Energy Mrs. Paparella

Slides:

Advertisements

Similar presentations

What is the relationship between heat and temperature?

Advertisements

Energy in Chemical & Physical Changes

Part One Heat and Temperature.

Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state.

Heat of Fusion Hf Energy needed to melt a gram of solid. Fusion = Melting Table B – Reference Tables ◦ 1g ice needs 334J of energy to turn to 1g liquid.

Heat and Temperature. The difference Heat – the energy that flows from hot to cold. Measured in Joules (J) or calories (cal). Temperature – measure of.

Heat: Lesson 4 Heat vs. Temperature. What happens to the movement of molecules as they’re heated? /energy-forms-and-changeshttp://phet.colorado.edu/en/simulation.

Heat, Temperature, and Internal Energy

CH. 12 Thermal Energy Sec. 12.1: Temperature & Thermal Energy.

What’s the MATTER: Specific Heat of Matter. Matter, Specific Heat of Matter At the conclusion of our time together, you should be able to: 1. Define specific.

Measurement of Heat Energy. The amount of heat given off or absorbed in a reaction can be calculated by a) q=mc∆T(Table T) q= heat (in joules or calories)

Unit: ENERGY Topic 1: Types of Energy Energy = The ability to do work or produce heat Unit of energy = the Joule = J Two types: Potential Kinetic Lord.

Types of energy POTENTIAL ENERGY : STORED ENERGY. The energy inside the substance. KINETIC ENERGY : Associated with motion. Average KE = TEMPERATURE.

Thermochemistry: Energy and Heat The Nature of Energy u Energy is the ability to do work or produce heat. u It exists in two basic forms, potential energy.

ENERGY n The ability to do work n remains constant in amount during a chemical or physical change n energy changes occur between the system and the surrounding.

Phases of Matter, Bonding and Intermolecular Forces

Phases of Matter, Energy and Phase Changes

Unit 13 Thermochemistry.

Thermochemistry CHAPTER 17.

Topic: Matter & Energy Aim: How can the amount of energy gained or lost by a system be calculated? Do Now: What Celsius temperature is the equivalent of.

Aim: What is thermochemistry?

What’s the MATTER!?!.

Thermochemistry.

Heat and Temperature.

Discovery Lab - Energy.

Bellringer 11/30 Determine the Kelvin temperature required for mole of gas to fill a balloon to 1.20 L under atm pressure.

Thermochemistry The study of the changes in heat energy that accompany chemical reactions and physical changes.

Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state.

Internal Energy (also known as Heat).

Liquids and Solids.

UNIT 3: ENERGY.

Welcome to the MATH.

HW # 7: Heat and Its Measurement

Unit 6: Physical Behavior of matter

Do now Turn in Chillin’ Out lab.

Energy & Calorimetry THERMOCHEMISTRY.

Energy EQ: What is the relationship between heat energy and temperature?

Heat Exchange During Physical Changes

Quantitative Energy Problems

Heat, Temperature, Heat Transfer, Thermal Expansion & Thermodynamics

Do Now & Announcements Work on Phase diagram practice

THERMOCHEMISTRY Thermochemistry is the study of the motion of heat energy as it is transferred from the system to the surrounding or from the surrounding.

Adv: Do Now & Announcements

How are various forms of energy different?

Do Now & Announcements Work on Phase diagram practice

Calculating Energy Changes at Phase Changes

HEATING CURVES.

Thermochemistry.

Conservation of Mass/Energy and Specific Heat

Heating & Cooling Curves

Warm-up What is the final temperature of a 25.0 g piece of metal if it absorbs 1122 joules of heat and its specific heat capacity is J/g°C? The.

Calculating Energy Changes at Phase Changes

Calculating Energy Changes at Phase Changes

Chem Get Phase Diagram WS stamped off from last class

Calculating Energy Changes at Phase Changes

What is energy? Two types: Potential and Kinetic Page 2

Heat Calculations Q = mHv & Q = mHf

Phases of Matter, Energy and Phase Changes

Thermochemistry: The study of heat changes that occur during chemical reactions and physical changes of state.

Thermochemistry The study of the changes in heat energy that accompany chemical reactions and physical changes.

Calculating Energy Changes at Phase Changes

Do Now & Announcements Work on Phase diagram practice

Heat and Temperature.

Do Now: Just to review before we start…

Calculating Energy Changes at Phase Changes

Heat and Temperature.

Heat, Temperature, Heat Transfer, Thermal Expansion & Thermodynamics

Presentation transcript:

Applying the Law of Conservation of Energy Mrs. Paparella Calorimetry Applying the Law of Conservation of Energy Mrs. Paparella

Law of Conservation of Energy Energy can be neither created nor destroyed. Heat naturally moves from warmer to colder objects or areas. Energy is released by warmer objects and absorbed by colder objects. Energy is measured in Joules (J) or Calories (Cal).

Temperature Heat and Temperature are NOT the same Temperature is a measure of the average kinetic energy of molecules. (KE) Temperature is measured in Celsius (oC) or Kelvin (K) Cold objects have molecules with very little KE while hot objects have molecules moving much faster and have more KE.

Heat of Fusion Fusion means to melt. Hf is the symbol for Heat of Fusion. Ice has a specific heat of fusion: 334J/g See Reference Table B. The formula for calculating the amount of heat needed to melt ice is on Table T. q=m Hf

How much heat is needed to melt 20 kg of ice? Change 20kg to g. 20kg x 1000g = 2 x 104 g Kg Find the formula q = m Hf q= 2 x 104 g x 334 J/g q = 6.68 x 106 J

Is there a Change In Temperature? When you have a temperature changed involved in a problem you have to use the formula: q=mcDT See Table T (Heat)

How much heat is needed to heat water up to 100oC for a mug of cocoa using 250 ml of water that comes out of the tap at 20oC? Need to use q=mcDT Mass of water = 250 g since 1ml of water = 1 gram of water since density of water is 1 g/ml. q = 250 g x 4.18 J/goC x (100oC-20oC) q=?

How much heat is needed to boil a 4. 0 liter pot of water for pasta How much heat is needed to boil a 4.0 liter pot of water for pasta? The water is at 30 oC already. This is a 3 step problem. First you need to bring the water up to the boiling point. So use the formula: q=mcDT. Then use the formula q= mHv Hv stands for Heat of Vaporization and it means to boil the liquid at the boiling point. Finally add the two answers together.