Energy and Matter. In which state of matter does conduction of heat occur? Why?

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Presentation transcript:

Energy and Matter

In which state of matter does conduction of heat occur? Why?

Solids – because thermal conduction requires the collisions between the molecules of a substance. Energy and Matter

Which are examples of good conductors of heat? a. metals b. non-metals c. water d. air Energy and Matter

Which are examples of good conductors of heat? a. metals b. non-metals c. water d. air Energy and Matter

Which are examples of poor conductors of heat? a. copper b. aluminum c. iron d. Styrofoam e. glass Energy and Matter

Which are examples of poor conductors of heat? a. copper b. aluminum c. iron d. Styrofoam e. glass Energy and Matter

Convection occurs in both _________ and ________ states of matter. Energy and Matter

Convection occurs in both liquid and gas states of matter. Collectively called “fluids” Energy and Matter

Which state of matter is completely compressed, retains its shape, and represents the lowest form of kinetic energy among its molecules? Energy and Matter

Which state of matter is completely compressed, retains its shape, and represents the lowest form of kinetic energy among its molecules? solids Energy and Matter

Which state of matter can be compressed further, its molecules completely dissociate to fill any container and represents one of the state with the highest kinetic energy. Energy and Matter

Which state of matter can be compressed further, its molecules completely dissociate to fill any container and represents one of the state with the highest kinetic energy. gas Energy and Matter

Which of the following statements is NOT true of liquids. a. its molecules are loosely associated b. particles have moderate kinetic energy c. easily compressed Energy and Matter

Which of the following statements is NOT true of liquids. a. its molecules are loosely associated b. particles have moderate kinetic energy c. easily compressed Energy and Matter

Which best describes a thermal insulator? a. impedes the flow of heat b. absorbs heat readily c. has low specific heat d. most metals are insulators Energy and Matter

Which best describes a thermal insulator? a. impedes the flow of heat b. absorbs heat readily c. has low specific heat d. most metals are insulators Energy and Matter

Thermal expansion occurs when a. water freezes b. materials are heated c. kinetic energy decreases d. potential energy increases Energy and Matter

Thermal expansion occurs when a. water freezes b. materials are heated c. kinetic energy decreases d. potential energy increases Energy and Matter

What is the boiling point of water in Celsius degrees? (Use proper units) Drop of a Bullet Energy and Matter

What is the boiling point of water in Celsius degrees? 100  C Energy and Matter

Convert 100  C to degrees Fahrenheit. Energy and Matter

Forces and Motion Convert 100  C to degrees Fahrenheit. F = (1.8  C)  F = (1.8  100  C) + 32 Drop of a Bullet

Convert 82  F to degrees Celsius.  C= (  F – 32)  C = (82 – 32) 1.8 Energy and Matter

What is the freezing point of water in Celsius degrees if it is 32 in  F? Energy and Matter

What is the freezing point of water in Celsius degrees if it is 32 in  F?  C= (  F – 32)  C = (32 – 32) 1.8 Energy and Matter

Which form of thermal heat transfer does NOT require matter? a. conduction b. convection c. radiation Energy and Matter

Which form of thermal heat transfer does NOT require matter? a. conduction b. convection c. radiation Energy and Matter

To change into thermal energy, radiant heat must be __________ by matter. a. absorbed b. converted c. diffracted d. reflected Energy and Matter

To change into thermal energy, radiant heat must be __________ by matter. a. absorbed b. converted c. diffracted d. reflected Energy and Matter

What is the equation for calculating kinetic energy? Energy and Matter

What is the equation for calculating kinetic energy? KE = ½ mv 2 But remember enter the numbers like mv 2 2

Kinetic energy is expressed in what units? Energy and Matter

Energy is measured in what units? Joules Drop of a Bullet Energy and Matter

What is the kinetic energy of a 5kg object traveling at 10m/s? Energy and Matter

What is the kinetic energy of a 5kg object traveling at 10m/s? KE = ½ mv 2 KE = 5kg x (10m/s) 2 2 = 250 J Energy and Matter

What is the equation for calculating potential energy? What do the letters stand for? Energy and Matter

Forces and Motion What is the equation for calculating potential energy? What do the letters stand for? PE = mgh m = mass g = gravity (9.8m/s 2 ) h = height of the object in m Drop of a Bullet

What is the gravitational potential energy of a 5 kg object 15 m above the ground? Energy and Matter

What is the gravitational potential energy of a 5 kg object 15 m above the ground? PE = mgh PE = 5 kg x 9.8 m/s 2 x 15 m 735 J Energy and Matter

What is the equation used to calculate thermal energy change?? Drop of a Bullet Energy and Matter

What is the equation used to calculate thermal energy change? What do the letters stand for? Q = cm  t Q thermal energy change c = specific heat m = mass  t = Final temp – initial temp Energy and Matter

Copper has a specific heat of 385 J/(kg K). How much thermal energy would be needed to heat it from 300K to 325K? Assume a mass of 1 kg. Energy and Matter

Copper has a specific heat of 385 J/(kg K). How much thermal energy would be needed to heat it from 300K to 325K? Q = cm  t Q = 385 x 1 kg x (325 K – 300K) 9625 J / kg assume one kg since mass isn’t given Energy and Matter

If the temperature in a room is 23 degrees Celcius, what is the room temperature in degrees Fahrenheit? Energy and Matter

If the temperature in a room is 23 degrees Celsius, what is the room temperature in degrees Fahrenheit? F = (1.8  C) + 32 F = (1.8 x 23  C) + 32 = 73.4  F Energy and Matter