1. Matter and Energy Chapter 4

2. Make sure you have everything you need to go home Make sure your phone is turned off Get out your bell work make sure your name is on it, I am going to collect it in a minute

3. Bell Work Complete the front side of the sheet by the sinks.

4. Bell Work Please show all your work! This means write down the formula, write down the numbers you are using, then solve the problem. Mass = 15 gvolume = 5 mL What is the density? 2. Length = 3 cmWidth = 5 cmHeight = 4cm What is the volume?

5. 4.1 Vocab Kinetic theory of matter – states that all of the particles that make up matter are constantly in motion

6. 4.1 Vocab temperature – a measure of the average kinetic energy of all the particles in an object

7. 4.1 Vocab thermometer – a device for measuring temperature degrees – evenly divided units of a temperature scale

8. Thermal Expansion All gases, many liquids, and most solids expand when their temperature increases.

9. Bell Work For each description write which temperature scale it matches (Fahrenheit or Celsius) 1.Freezing point of water is 0 degrees 2.Freezing point of water is 32 degrees 3.Used by scientists and most countries 4.100 units between freezing and boiling points of water

10. Bell Work 1.Can an oxygen canister ever be half empty? Explain. 2.How does tea flavor spread from a tea bag throughout a cup of hot water? 3.What instrument is used to measure temperature?

11. 4.2 Vocab Heat – a flow of energy from an object at a higher temperature to an object at a lower temperature

12. 4.2 Vocab thermal energy – the total amount of kinetic energy of particles in an object

13. 4.2 Vocab calorie – the amount of energy needed to raise the temperature of 1 gram of water by 1 degree C joule – scientific unit for measuring energy (1 calorie = 4.18 joules)

14. Food Calorie One Calorie is actually one kilocalorie or 1000 calories One Calorie in food contains enough energy to raise the temperature of 1 kilogram of water by 1 degree C

15. 4.2 Vocab specific heat – the amount of energy required to raise the temperature of one gram of a substance by one degree Celsius

16. Bell Work Write the definition and correct term for each. 1.The flow of energy from a warmer object to a cooler object. 2.The average kinetic energy of particles in an object. 3.The total kinetic energy of particles in an object. 4.The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree Celcuis.

17. Bell Work 1.How many calories are needed to raise the temperature of 75 grams of water from 5 degrees Celsius to boiling? 2.How many calories are needed to raise the temperature of 50 grams of water from 30 degrees Celsius to boiling?

18. Energy moves as heat in three ways Conduction – moves energy from one object to another when they are physically touching Convection – energy is transferred in gases and liquids. Occurs when a warmer, less dense area of gas or liquid is pushed up by a cooler, more dense area of the gas or liquid. Radiation – energy travels across distances in the form of electromagnetic waves

20. Conduction Occurs any time that objects at different temperatures come in contact with each other Can also occur within a single object (spoon) Some materials transfer kinetic energy of particles better than others

21. Conductors – materials that transfer energy easily Insulators – materials that do not transfer energy easily or are poor conductors

22. Convection A cycle in nature responsible for most winds and ocean currents 1. cooler, denser air flows in underneath the warmer, less dense air, and pushes the warmer air upward 2. When this air cools, it becomes more dense than the warmer air beneath it 3. The cooled air sinks and moves under the warmer air

23. Radiation Energy that travels as electromagnetic waves Includes visible light, microwaves, and infrared light. Sun is the most significant source All objects, even humans, emit radiation and release energy to their surroundings Can move through empty space (Sun to Earth)

24. Bell Work Answer the following questions imagining that a person is sitting in a chair in front of a fireplace. 1.What are two ways in which the person is warmed by the fire? 2.If a dog is sitting in between the person and the fireplace why might it be warmer where the dog is sitting? 3.Where in the room would conduction be most noticeable?

25. Bell Work Please complete #1- 5 on page 95 then get out your study guide and review for the test.

26. Bell Work 11/18/10 Please answer #1-5 on page 37. These will be taken for a grade so make sure you do your best.