Electricity and Energy 1 Content Statements

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1 Keep this in good condition, it will help you pass your final exams. The school will only issue one paper copy per pupil. An e-copy will be placed on the school s web-site. Electricity and Energy 1 Content Statements

2 Deans Community High School Physics Electricity and Energy 3.3 Heat and Gas Laws Electricity and Energy 2 Content Statements

3 I have developed my understanding of the kinetic model of a gas. I can describe the qualitative relationships between pressure, volume and temperature of gases. SCN 4-05a I have researched new developments in science and can explain how their current or future applications might impact on modern life. SCN 4-20a Having selected scientific themes of topical interest, I can critically analyse the issues, and use relevant information to develop an informed argument. SCN 4-20b I have carried out research into novel materials and can begin to explain the scientific basis of their properties and discuss the possible impacts they may have on society. SCN 4-16a Through experimentation, I can explain floating and sinking in terms of the relative densities of different materials. SCN 4-08b Content National 3 Energy Transfer Conduction of heat Convection of heat Radiation of heat Electricity and Energy 3 Content Statements

4 Content National 4 Gas laws and the kinetic model Kinetic model of a gas. Applications of the kinetic model of a gas using knowledge of pressure, volume and temperature (for a fixed mass of gas). Content National 5 Specific heat capacity The same mass of different materials requires different quantities of heat to raise the temperature of unit mass by one degree Celsius. The temperature of a substance is a measure of the mean kinetic energy of its particles. Explain the connection between temperature and heat energy. Use appropriate relationships to carry out calculations involving mass, heat energy, temperature change and specific heat capacity. Conservation of energy to determine heat transfer. Gas laws and the kinetic model Pressure is the force per unit area exerted on a surface. Describe how the kinetic model accounts for the pressure of a gas. Use an appropriate relationship to calculate pressure, force and area. Explanation of the pressure-volume, pressure-temperature and volumetemperature laws qualitatively in terms of a kinetic model. Use of appropriate relationship to calculate the volume, pressure and temperature of a fixed mass of gas. The relationship between kelvin, degrees Celsius and absolute zero of temperature. Electricity and Energy 4 Content Statements

5 Learning Outcomes At National 5 level, by the end of this section you should be able to: Specific heat capacity 1. State that the same mass of different materials requires different quantities of heat to raise the temperature of unit mass by one degree Celsius. 2. State that the temperature of a substance is a measure of the mean kinetic energy of its particles. 3. Explain the connection between temperature and heat energy. 4. Use the appropriate relationship to carry out calculations involving mass, heat energy, temperature change and specific heat capacity. 5. Use conservation of energy to determine heat transfer Electricity and Energy 5 Learning Outcomes

6 Heat and Temperature Heat is a form of energy, measured in Joules (J). The particles that make up any object have kinetic energy. The greater the heat energy the greater the kinetic energy of the particles. Temperature is a measure of how hot or cold something is. We measure temperature using a thermometer. There is more than one temperature scale. The Celsius temperature scale is a very common scale where temperatures are given as degrees Celsius ( C) Common Temperatures Water boils at 100 C. Normal body temperature is 37 C. Water freezes at 0 C. Other temperature scales are the Kelvin scale (used when carrying out calculations with gases) and the Fahrenheit scale (an older scale sometimes used to describe weather temperature) We can describe temperature as a measure of the mean kinetic energy of the particles making up an object. Electricity and Energy 6 Specific Heat Capacity N5

7 Specific Heat Capacity The specific heat capacity is the amount of energy required to raise the temperature of 1kg of a material by 1 C. The symbol for specific heat capacity is c and the units are J kg -1 C -1. Measuring Specific Heat Capacity thermometer Power supply Joule Meter Metal heater block A heater is used to raise the temperature of a metal block. A joule meter measures how much energy is supplied, while a thermometer is used to measure the temperature rise. The mass of the metal block can be measured using a set of scales. The specific heat capacity can be calculated using c = Total energy added mass x change in temperature The value is inaccurate because heat energy is lost to the surroundings. The specific heat capacity of different metals can be calculated by repeating the experiment with a different type of metal block. SAFETY be careful with hot materials. Electricity and Energy 7 Specific Heat Capacity N5

8 Specific Heat Capacity E h = Heat energy (J) E h = mcδt m = mass (kg) c = specific heat capacity (Jkg -1 C -1 ) ΔT = change in temperature ( C) Example 1 A 2kg block of Copper is heated from 20 C to 50 C. How much energy is required? E h = mcδt = 2 x 386 x [50 20] = 23160J Example J of energy is supplied to 0.5kg of Aluminium. What is the change in temperature? E h = mcδt => ΔT = E h /mc = 6765/(902 x 0.5) = 15 C Example 3 The temperature of some water is raised 10 C when 12540J of energy is added. How much water was used? E h = mcδt => m = E h / cδt = /4180 x 10 = 0.3kg Example kg of oil at 20 C is heated in a pan J of energy is added. What is the final temperature? E h = mcδt => ΔT = E h / mc = / (1.5x2130) = 45 C Final temperature = = 65 C Specific Heat Capacity (Jkg -1 C -1 ) Copper 386, Aluminium 902 Water 4180 Oil Electricity and Energy 8 Specific Heat Capacity N5

9 Conservation of Energy In the experiment showing how to calculate specific heat capacity the energy change was electrical energy to heat energy. The electrical energy used was measured directly using a joulemeter. This could also have been calculated. Method 1 Use the power rating of the heater and the time it is switched on for. E = Pt Method 2 Measure the voltage across the heater and the current through it to calculate the power P = IV If we also know the time taken E = Pt = IVt Assumptions made when carrying out experiments 1. All the electrical energy is converted to heat energy. 2. All the heat energy is used to heat the metal block. The heat loss to the air and surroundings could be minimised by using insulation. Efficiency The efficiency of the heater could be calculated by using the temperature rise of the metal block as the output energy and the electrical energy supplied as the input energy. Electricity and Energy 9 Specific Heat Capacity N5

10 temperature States of Matter Solid heat in liquid heat in gas Solid heat out liquid heat out gas The particles in a solid are tightly packed and held together. If we add heat energy the particles vibrate more and the bonds begin to break. The solid changes in to a liquid (melts). The particles in a liquid are closely packed but can move around. If we add heat energy the particles move round more and the liquid begins to change into a gas. The particles in the gas move around quickly and are spaced far apart. Datalogger The solid material is heated until it is a liquid. The temperature is monitored while it cools and sets. Temperature constant Change in state Stearic acid 0 time When a material changes state the temperature remains constant Electricity and Energy 10 Specific Heat Capacity N5

11 Specific Latent Heat E h = ml E h = heat energy (Joules J) m = mass (kg) l = specific latent heat (J kg -1 ) When materials change state the temperature stays constant. There are two possible changes in state 1. Change between solid and liquid (or vice versa) specific latent heat of fusion 2. Change between liquid and gas (or vice versa) specific latent heat of vapourisation How much water would evaporate if you supplied 25000J of energy to water at 100 o C? Latent heat of vapourisation for water = 2.26 x 10 6 Jkg -1 E h = ml => m = E h = l 2.26 x kg How much energy does it take to melt 5kg of lead? Latent heat of fusion of lead = 0.25 x 10 5 Jkg -1 E h = ml = 5 x 0.25 x 10 5 = 1.25 x 10 5 J Electricity and Energy 11 Specific Heat Capacity N5

12 Learning Outcomes At National 4 level, by the end of this section you should be able to: Gas laws and the kinetic model 1. Describe the 3 states of matter in terms of the arrangement and movement of particles within them. 2. Describe the particles of a gas in terms of kinetic theory. 3. List applications of the kinetic model of a gas using knowledge of pressure, volume and temperature for a fixed mass of gas. At National 5 level, by the end of this section you should be able to: Gas laws and the kinetic model 1. State that pressure is the force per unit area exerted on a surface. 2. Carry out calculations involving the relationship between pressure, force and surface area. 3. State that pressure is measured in Pascals (Pa). 4. Carry out calculations involving the relationship between pressure, force and area. 5. Describe the relationship between the pressure and volume of a fixed mass of gas at constant temperature in terms of the kinetic theory of gases. 6. Describe the relationship between the pressure and temperature of a fixed mass of gas at constant volume in terms of the kinetic theory of gases. Electricity and Energy 12 Learning Outcomes

13 Pressure P = Pressure (Pascal Pa) P = F F = Force (Newton N) A A = Area (metres squared m 2 ) If you spread the weight (force) over a larger area the pressure goes down. Practical applications show shoes - wide tyres on tractors to stop them sinking in mud The mass of the box is 3kg. 0.4m 0.3m Calculate the pressure exerted on the surface when it is placed on each of the three different sides. 0.2m W = mg = 3 x 9.8 = 26.4N Area 1 = 0.2 x 0.3 = 0.06m 2 Area 2 = 0.2 x 0.4 = 0.08m 2 Area 3 = 0.3 x 0.4 = 0.12m 2 P 1 = F A = = 443 Pa P 2 = F A = = 330 Pa P 3 = F A = = 220 Pa How much pressure is exerted by a 50kg woman standing on your toe with the 1cm heel of a stiletto? P = F = 50 x 9.8 = 490 = 4,900,000 Pa A Electricity and Energy 13 Gas Laws and the Kinetic Model N5

14 Kinetic model of gases practical effects The air around you is made from atoms and molecules of gas. The molecules move in straight lines at constant velocity until they hit into another molecule or an obstacle. (Newton s first law) When they collide the molecules exert an equal and opposite force on one another (Newton s third law). At normal room temperature there are many collisions per second. Changing Temperature At room temperature the molecules move at a certain velocity. Each molecule has a certain amount of energy. If the temperature increases we add extra energy to the gas molecules. This means they move faster, causing more collisions with greater force. A balloon will increase in size if we heat the gas up because the gas particles can push the walls of the balloon out. On a warm day the tyres on a car heat up, this increases the pressure inside the tyre. Electricity and Energy 14 Gas Laws and the Kinetic Model N4

15 Changing Pressure Gas stored in an aerosol is stored under pressure. The molecues of gas collide frequently with the walls of the container. Gas Under Pressure If the gas is released from the aerosol the pressure goes down because the particles can spread out more. The temperature also falls when the pressure decreases and volume increases. The pressure in an aircraft is increased so that it is higher than the pressure outside the plane for the comfort of the passengers. Changing Volume When you use a bicycle pump to inflate a tyre you decrease the volume of the gas. This increases the pressure inside the tyre. If you feel the end of the pump you will also notice that the temperature of the gas has risen. Scuba divers take tanks of air underwater so they can breathe. The tanks are filled with a large volume of air squeezed into a small volume this means the air is under pressure. Electricity and Energy 15 Gas Laws and the Kinetic Model N4

16 Kinetic model theoretical explanation Pressure and Volume (constant Temperature) The molecules in a gas move around at random, hitting one another and the sides of the container with a certain force. Pressure = force/area If the size of the container is reduced the molecules hit into one another and the walls of the container more often per second. This increases the force. Since Pressure = Force/Area the pressure goes up. Pressure and Temperature (constant Volume) The molecues in a gas move at a certain velocity, due to their kinetic energy. When they collide with the walls of the container they exert a force, which causes a certain pressure. cold If the temperature of the gas increases the kinetic energy of the particles increases and they move with greater velocity. hot This causes them to collide with the walls of the container more often per second, which increases the pressure inside the container. Electricity and Energy 16 Gas Laws and the Kinetic Model N5

17 Kinetic model theoretical explanation Volume and Temperature (constant Pressure) The molecules in a gas move at a certain velocity, due to their kinetic energy. When they collide with the walls of the container they exert a force, which helps keep the volume of the container. If the temperature of the gas decreases the kinetic energy of the molecules decreases and they move with less velocity. The molecules collide with the walls of the container less often per second and the volume decreases. Temperature Scales The temperature scale often used is the Celsius scale. 0 C is the temperature where water freezes. The Kelvin temperature scale is often used when dealing with gases. 0K (note there is no symbol used) is called Absolute Zero. This is because the particles of all materials have no kinetic energy at this point. 0K is found at -273 C. The size of one degree Celsius is the same as one degree Kelvin. To convert between the two temperature scales Celsius to Kelvin Kelvin to Celsius Add 273 Subtract 273 Electricity and Energy 17 Gas Laws and the Kinetic Model N5

18 pressure pressure Boyle s Law Pressure and Volume of a gas Datalogger Pressure Sensor syringe The equipment above is connected together with the volume of the syringe set to 60ml. The pressure is increased by pushing on the end of the syringe. The volume is read from the scale on the side of the syringe and the pressure is read from the screen on the datalogger. As volume decreases the pressure increases. The results from the experiment are plotted in a graph. The graph of pressure against volume gives a curve. 0 volume When pressure is plotted against 1/volume you get a straight line graph which passes through the origin. 0 1/volume P V PV = constant P 1 V 1 = P 2 V 2 (provided temperature is constant) Electricity and Energy 18 Gas Laws and the Kinetic Model N5

19 pressure pressure pressure Pressure and Temperature The gas inside a flask is heated using a water bath. The pressure and temperature are recorded at regular intervals, then plotted on a graph. 0 temperature C temperature C P P/T = constant 0 temperature (K) P 1 /T 1 = P 2 /T 2 (provided volume is constant) Electricity and Energy 19 Gas Laws and the Kinetic Model N5

20 volume volume volume Charles Law Volume and Temperature Air is sealed in a capillary tube using a small bead of mercury. The fixed mass of gas is heated in a water bath, with the tube above the mercury left open to the atmosphere. This allows the pressure to remain constant on either side of the bead. The capillary tube has a constant cross sectional area, so we can use the length of the column of air as a measure of the volume. 0 temperature C temperature C V V/T = constant 0 temperature K V 1 /T 1 = V 2 /T 2 (provided pressure is constant) Temperature MUST be in KELVIN Electricity and Energy 20 Gas Laws and the Kinetic Model N5

21 Combined Gas Equation The three gas equations can be combined to give one equation. P 1 V 1 = P 2 V 2 P 1 = P 2 V 1 = V 2 P 1 V 1 = P 2 V 2 T 1 T 2 T 1 T 2 T 1 T 2 Where P 1 = Pressure 1 (Pascal Pa) P 2 = Pressure 2 (Pascal Pa) V 1 = Volume 1 (metres cubed m 3 ) V 2 = Volume 2 (metres cubed m 3 ) T 1 = Temperature 1 (degrees Kelvin K) T 2 = Temperature 2 (degrees Kelvin K) 100 cm 3 of oxygen is stored at a pressure of 40kPa. If the pressure is reduced to 20kPa what is the new volume? P 1 V 1 = P 2 V 2 Temperature is T 1 T 2 constant Equation becomes P 1 V 1 = P 2 V 2 40 x 10 3 x 100 = 20 x 10 3 x V 2 V 2 = 200cm cm 3 of air is stored at a temperature of 27 C. The temperature in the room rises to 57 C. What is the new volume? 27 C = 300K 20 C = 330K P 1 V 1 = P 2 V 2 Pressure is T 1 T 2 constant V 1 = V 2 => 100 = V 2 T 1 T V 2 = 110 cm 3 3 litres of hydrogen gas exert a pressure of 40kPa on a balloon at a temperature of 300K. If the temperature is reduced to 250K what is the new pressure? P 1 V 1 = P 2 V 2 Volume is P 1 = P 2 => 40 x 10 3 = P 2 = 33.3kPa T 1 T 2 constant T 1 T Electricity and Energy 21 Gas Laws and the Kinetic Model N5

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