Energy sources

The role of energy in society

Watch the film about energies and answer

• What is a source of energy?
• Which are the main primary sources of energy? Tell what they consist of
• What is the difference between renewable and non renawable sources
• Tell which sources are renewable and which aren´t
• Tell at list three advices regarding the comsumption of energy

Electricity 3 ESO

Electricity and its applications

Watch these films and answer

•  What does a battery do?
• How can we visualise potential energy?
• What happens if we use several batteries in parallel?
• What happens if we use several batteries in series?

• Look at the initial circuit and tell what is represened as: a) red balls, b)a difference of heigth c)a yellow track.
• How do they define voltage. Who provides it?
• What happens when we open an interruptor? What happens when we close it?
• Hat determines the amount of current through an electric circuit?
• What is the meaning of no current passing through a ligth bulb?
• What is the function of a properly working battery?
• How much is the potential of all points connected by wires or metal switches?
• What is the total current in a parallel circuit? And in a series circuit?
• What does Kirchoff's law refer to?
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Energy and its applications

Energy as a physical magnitude:

Energy is a crucial physical magnitude which takes time to understand:

Watch this film and answer the questions:

• What is energy
• What forms of energy exist? List them?
• Tell examples of different usages of energy during the trip. (think of objects and persons involved)
• How do they define sources of energy?
• List examples of sources of energy you see  in the film and what this source of energy is used to
• According to the video, does energy dissapear? What happens to it?

Review exercises 2 ESO

• Balance these chemical equations:

1. Co + O2 => Co2O3
2. C4H8 + O2 =>  CO2 +  H2O
3. Fe + HCl =>  FeCl2 +  H2
4. Na + H2O => Na2O + H2

• Determine wheter these are chemical or physical:

1. Melting of ice
2. Oxidation of a wet screw
3. Solving salt into water
4. Drilling a wall
5. Photosynthesis

• Imagine this reaction of a fuel: CnH2n + O2 => CO2 + H2O. Tell if these factors will affect the reaction rate

1. The fuel is cooled to solid state
2. The fuel is vaporised
3. We control the temoperature reaction to 30ºC. 
4. We let the reaction temperature reach 1500ºC

• Tell if these proccess is biological or industrial:

1. Synthesis of a polymer
2. Human breathing
3. Mythosis
4. Cracking of oil

• Are these statements true or false. Tell why

1. The combustion of fuels affects the ozone layer.
2. CFCs provoque the ozone-s layer depletion
3. Global warming is only provoqued by the industrial activity
4. Atmospheric polution only provoques global warming
5. Soil polution has to do with waste dumping.
6. Only industries pollute water

Chemical reactions 2ESO

Watch these videos and answer the questions 

Video 1

• What is a chemical proccess
• What examples of chemical reactions do they give us?
• What type of properties change during a chemical reaction. Give examples of each type
• Explain, using the film's words, what a chemical equation stands for

Video 2:

Watch and apply to balance these equations:

• N2 + O2 -> N2O5
• CH4 + O2 -> CO2 + H2O
• Li + O2 -> Li2O

Formulation Practise

Write the formula of:

¨

¨Lithium nitride

¨Berylium hydroxide

¨Hydrogen

¨Lead dioxide

¨Tin tetrafluride

¨Calcium hydride

¨Gold (III) oxide

¨Rubidium selenide

¨Sulphur (IV) oxide

¨Silver

¨Alumnium oxide

Name

¨K2O

¨Cl2

¨NiBr3

¨Co

¨Fe(OH)2

¨CaH2

¨NiN

¨Cu2O

¨SeF6

¨BaO

¨Mg(OH)2

Organic formulation

Name

Write the formula of

1. 4 methyl 4 Chloro 1,3 hexanodiol
2. Buthenodioic acid
3. 1 Methyl 1,3 cyclobuthadiene
4. 2,2-dichloro 3-hidroxi-buthanoic acid

Last Review 3 ESO

1 How would you separate? A) A mixture of oil and water, b) a mixture of sand, water and iron c)a dissolution of water and alcohol.

2 List the basic and the derived magnitudes, indicating symbols and units

3 Convert these magnitudes to the IS units

813 mm                                                               12,5 mg

3,2 min                                                                234ºC(add 273,15K)

5,98 km²                                                             165 km/h

0.125 hm³                                                           77,7 h

23,14 ton                                                            25 L(dm³)

 4 Express into scientific notation with the number of digits between parenthesis:

0.00025698781 m (4)                                         235874 kg (3)

21.8754 l (2)                                                       0.012543 g/l (5)

5 When we measure the energy of an object against its speed, we get:

Speed m(s)	Energy (J)
2	8
4	32
5	50
6	72

Graph these results, determine the relationship and the equation for energy as a funcion of speed

Review 4 ESO L1 and L2

• Take the elements A)Z=12; B)Z=17 and C)Z=36. Write their electrónic configuration, their Group and period. Tell their aggregation state, their stable iones.  Order them by their increasing atómic radious, electronegativity, ionization potential. For the bonds A-A, B-B, A-B, Tell which Will be gaseous, which Will be a solid electrical conductor and which will be an electric conductor. 

• Summarise the 4 atomic models: author, experiment and what it consists of. 

• When we measure the kinetic energy against the speed, we get these data:

        v(m/s) 2; 4;  5;  6
        E (J) 8; 32; 50; 72
     Graph these data, determine the type of relationship and the equation E as a function of v.

Review 4 ESO L1 and L2

• Take the elements A)Z=12; B)Z=17 and C)Z=36. White their electrónic configuration, their Group and period. Tell their aggregation state, their stable iones.  Order them by their increasing atómic radious, electronegativity, ionization potential. For the bonds A-A, B-B, A-B, Tell which Will be gaseous, which Will be a solid electrical conductor and which will be antes electric conductor. 

• Summarize the 4 atomic models: author, experimentado and what it consists of. 

• When we measure the kinetic energy against the speed, we get these data:

v(m/s) 2; 4;  5;  6
E (J) 8; 32; 50; 72
     Graph these data, determine the type of relationship and the equation E as a function of v.