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

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?

Ecercises 4 ESO Forces

1. Graph and order these forces by thir magnitude(-3i, 4j), (2i,8j), (-7j), (5i), (8i, -6j)
2. A R=10m ferries turns at 0.25Hz. Determine the aparent weight of a 50kg teenager when:a) he is at its bottom b)he is at its top. Draw the forces diagram
3. A bicycle rider tries to make a 15m radious looping. Which is the minimal speed he must have at the top? Draw the forces diagram
4. A horizontal spring with k=5000N/m is lengthened 10cm and then attached to a 25kg stone. If the friction quotient is 0,4 What will be the total force over the stone and the acceleration?. Draw the forces diagram

History of simple machines

Take a look at the video about simple machines (s.m) and answer

• How many parts has a simple machine got?
• What have humans created with s.m?
• What do s.m do?
• List the 6 main s.m.
• Which is the oldest s.m?
• Which is the most simple s.m.?
• How long have s.m.been being used?
• Why are simple machines called so?
• Who made the first simple machine? How old are they?
• How do we define and measure Work?
• Which s.m. is easiest to build?

Simple machines

Watch this film and answer

What is a simple machine? What is it used for?
Explain these simple machines and tell examples of them:

• Lever
• Pulley
• Inclined plane
• Wedge 

Studying motion

Watch the film and answer the questions

• What different types of movement do they tell you about?
• How do we know we are moving?
• Why do things move?
• Explain the different type of forces they tell you about
• Do forces exist over an object which stands still? What happens to them?
• Why would a tiny force cause a card's house to collapse?
• What happens if forces are unbalanced?
• Explain the two ways they ecplain for winning a tug-of-war
• What other factors affect the balance?

Newton laws

The laws of Newton:

Watch the film and answer

• What do the Newton laws govern?
• Explain the 3 laws of Newton 
• Why doesn't earth notice forces created by people?
• Why doesn't earth move along a straight line?
• Why do bicycles stand still instead of falling?
• Why do helicopters have a tail rotor? 
• Why do planes fly?

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

Chemistry and the environment

Watch this video and answer:

What is the main cause for global warming?
Why does it affect climate?
What climatic effects  can it cause?
How does it affect ecosystems. Tell examples 
Why can it cause floodings?
What happens when CO2 solves into water?

Video 2:

What does this video tell us about?
Batteries?
Drinking?
Burning plastics?
Plastic foams?
Appliances?

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

Review 2 ESO periódic table

1. In this periódic table Mark out: a) Period 3; Alkali metals, transición metals, carbonoids, anfigens, noble gases
3. Locate in the table:a) Z=39; b) Fr; c) Au; d)Alkali Earth Metal period 3; e)Anfigens Period 3; f)Si; g) Ne.
4. When you Know all these elements, order them by their metallic character, atomic radious, ionization energy. 
5. Tell which kind of compound will form a-e; b-b

Using the periodic table: 3 and 3 Bilingual

When we locate an element in the periodic table, we inmediately know: 

1. Its atomic number
2. Its electronic configuration 

   

   fig 1: Periodic table trends

3. Its period and family
4. Its relative size
5. Its metallic character
6. Its relative electronegativity
7. The bondings with other elements: If the two are on the left side of the periodic table (except H): Metallic; If one is on the left and the other is on the rigth: ionic; If the two are on the rigth: covalent.

If we look at table position´s to find K and Cl (find them), we will see:

K Z=19; It is a metal: period 4, group I, [Àr] 4s1, alcali metal,
F Z=9; It is non metal. Halogen. [Ne] 3s2 3p5

We can order their properties by their  position: a) Atomic radius: K is on the left and in a bigger period: look at the trend in fig 1: K atom is much bigger than Cl; K is also much more metallic. The ionization energy is bigger for Cl, because it is on the rigth and in a lower period.
They will form an ionic bonding: a Crystal.

In the table, locate these elements: Rb, Ca, P, and O and:
a) Tell their atomic number, period, group, and if it is a metal; (3 ESO: electronic configuration)
b) Order them by its atomic radious, metallic character, ionization energy
c) (3 ESO): Tell the kind of bonding between: Rb and O; Ca and Ca, P and P 
Send the answers to the teacher using "Formulario de Contacto"
Wacth this video:

Properties of matter 2ESO

Watch this video about matter and answer in (formulario the contacto" to  these questions:

• Where can do we find matter?
• What do we understand about matter?
• What do we understand as propoerties?
• What properties do all matter have?
• Tell examples of properties we can use to different from one substance to another

Structure of Matter and the KMT hypothesis

Watch these videos and answer the questions

1.  What is the main idea of the KMT?
2. What are the two main parte of KMT
3.  How do partícles move in a)solid b)líquids c)gasses