Flashcards
Grade 7 Science Unit C Review
Cards in this deck (68)
- 1Caloric Theoryheat was an invisible fluid (caloric) because it flowed from a hotter object to a cooler one
- 2What was heat thought of as in 1600it was thought of as a combination of fire and air
- 3Spoon experimentIf you put a spoon in a bowl of hot soup the entire spoon would eventually become hot
- 4chain reactionparticles do not move from one end to another but they bump each other transferring heat
- 5convectionflow of heat energy that involves moving liquid or gas particles
- 6Expansion jointsThey deal with expansion of bridges
- 7What does the speed of a substance depend on?The state of a substance
- 8What is the boiling and condensing point of water?100 degrees celcius
- 9What is the freezing and melting point of water?0 degrees celcius
- 10What is everything made of?tiny particles that are always moving
- 11conductiontransfer of heat energy between substances that are in contact with each other
- 12Thermal expansionexpansion of a substance caused by an increase of thermal energy
- 13contractionas the thermal energy of a solid decrease the volume decreses
- 14expansionas the thermal energy of a solid increases the volume increases
- 15volumethe amount of space matter occupies
- 16Who is Anders Celsius? What did he do? When did he do it?He is a swedish astronomer
He came up with a scale different from fahrenheit (Celsius)
He came up with the scale in 1742 - 17Who is Gabriel Daniel Fahrenheit? What did he do? When did he do this?He is a german physicist
He developed a more accurate means of measuring temperature (Fahrenheit scale)
He did this in 1700s - 18Who is Galileo Galilei? What did he do? When did he do it?He was and italian scientist
He produced the first device to measure heat
He did it in 1590 - 19Who was Jhon Locke? what did he do? When did he do it?He was a english scientist
He proved that our sense of touch id not a good way to measure temperature
He did this 300 years ago - 20Heatis the energy that transfers from one substance to another because of the difference of Kinetic energy
- 21Thermal energytotal Kinetic energy of all the particles the substance contains
- 22temperatureis a measure of the average Kinetic energy of the particles in a substance
- 23what do the particles in a liquid look like?
- 24how much kinetic energy does a liquid have?more energy than of a solid
- 25what is the shape and volume of a liquid?They take the shape of the container and have a definite volume
- 26How much movement is in a liquid?The particles loosely slip pst each other They have more movement then solids
- 27What do the particles in a gas look like?
- 28How much Kinetic energy does a gas have?More Kinetic energy than of solids and liquids
- 29What is the shape and volume of a gas?No definite shape or volume
- 30How much movement is in a gas?Lots of movement more than of solids and liquids
- 31What do the particles in a solid look like?
- 32How much Kinetic energy does a solid have?less Kinetic energy than a liquid or a gas
- 33What shape and volume is a solid?Definite shape and volume
- 34How much movement is in solids?Very limited movement
- 35hat does the particle model of matter consist of?1.All matter is made of extremely small always moving particles
2. Each particle has energy of movement
3. Adding heat to matter makes the particles move faster
4.There are spaces between particles - 36What does sustainable use of resources mean?It means that we are trying to use our resources wisely and do as little damage to the environment when we use them
- 37Sustainablesomething that can be maintained or continued indefinitily
- 38Wantsare aspects of our lives that we don't necessarily need to survive
- 39NeedsThey are the basics required conditions that we must meet in order to live
- 40What is the franklin stove?Invented by Benjamin Franklin. When the front is open it works as a fireplace and when it is closed it works as a cook top
- 41ExpansionAs thermal energy of a solid increases the volume increases
- 42why do we need heat?To maintain our basic needs
To store and prepare food - 43Standard of livingA measurement of how well we live
- 44What does energy come from?The movement of tiny particles that makes up all matter
- 45Heat is a form of what?Energy
- 46ConductorsA material that allows easy transfer of heat
- 47Heat travels in ONE DIRECTION from what to what?High thermal energy to low thermal energy
- 48Where is conduction most common?Solids
- 49InsulatorsMaterials that do not allow easy transfer of heat
- 50Examples of insulatorsCork, Plastic and Wood
- 51Examples of conductorsMetals
- 52Convection CurrentsWhen these particles move in a circular motion
- 53Convection can result in what?Heat loss
- 54Radiant energyEnergy transferred from it's source by radiaton
- 55RadiationTransfer of energy of invisible waves that can travel great distances
- 56what type of materials absorb heat?Dull or dark
- 57what materials reflect heat?Shiny and light coloured
- 58Solarenergy from the sun
- 59Geothermalenergy from deep inside earth
- 60Solar heating can be either what or what?Passive or active
- 61What is the basic approach of Passive solar heating?To reduce heat loss and increase heat gain from the sun
- 62How does a passive heating system reduce heat loss and increase heat gain?1. Insulating the building as much as possible
2. place most windows on the south side - 63What are the three components of a active solar heating system?1.A collector
2. Heat storage unit
3.Heat distribution system - 64How does the active solar heating system work?1. Water used in collector to trap solar energy
2. Copper tubing on a black surface is placed under a glass pane
3. Sun's rays pass through the glass and area become heated
4. Insulation assists in containing thermal energy
5. Water running through copper tubing becomes heated
6. Heated water is pumped to the heat storage unit by distribution unit - 65What can solar energy be converted to?Electricity
- 66Solar arraySolar cells arranged in panels and connected
- 67What are the benefits of solar energy?1. the suns energy is not limited
2. Available to everyone
3. Does not create pollution
4. Does not carry radiation risks - 68What are the costs for Solar energy?1. Setting up a solar system is usually more expensive than electrical or fossil fuel systems
2. A back up system is required
3. Solar cells are expensive
4. Disposal of used solar cells is an environmental concern
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- Flashcards on Grade 7 Science Unit C Review, created by Sanford Farley on 24/02/2015.
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- Sanford Farley
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