Ideal gases equation 4ESO

When we study reactions with gases at

condiciones which are noticias ideal, we must use the ideal gases equation:

PV=nRT

P=pressure in atm. 1atm=760mmHg

V=volume in L

n=n of moles, If we have mass n=m/Pm

R=0.082 atm•l/Kmol 

T=temperature in K (T°C+273.15)

Exercises:

1. Determine the volume of a)3 mol of gas at 1.5 atm and 30°C b)10 g of O2 at 500mmHg and 100°C c
2. Determine the number of moles of 5L of gas at 50°C and 1000mmHg. 
3. Determine the temperature of 56g of N2 at 380mmHg in a 20L recipient. b)2 mol of gas at 5atm in a 10L recipient
4. Determine the pressure of: 5 mol of gas at 25°C in 100L b) 1 g of H2 at 30°C in a 5L recipient.
5. A 5L bottle has H2 at 2.5 atm and 50°C. A spark makes it burn with air. How much air will we need at 30°C and 1atm How much water will we produce?

Data: Pm/ g/mol = H=1, O=16, N=14

Stoichiometry 4ESO

1. 250mL of hidrochloric acid 1 M react with a volume of calcium hydroxide 0.25M, so that the final products are all neutral. a) Write and balance the chemical equation. b) Calculate the volume of Ca (OH)2 solution, the mass of salt and the volume of water produced.
   
2. 450g of 95% Alluminum sample react With air. How much Alluminium(lll)oxide will we produce? How much air at 2atm and 100°C will we need. P (atm)V(L)=nRT(K) R=0.082
3. 11.2 L of propane  (C3H8) in NNCC  burn with oxígen. The gaseous products are collected in the same recipient (=V) at 50°C. What will be the new pressure? 
   
   

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

Chemical reactions 4 ESO

Watch this films and answer the questions
Send the answers With "Formulario de contacto"

1. What examples of chemical reactions do you see in the video?
2. How does the rust reaction take place as explain by the candle?

In the second video

1. What does the scientist do with iron?
2. What is the cause for breathing, rust and Blood being red?
3. What does the balloon explode?
4. List several plenomena which May happen during a chemical reaction

Atomic models

In this video they explain you the way to work out electronic configurations in an atom using the periodic table blocks and write down the electrionic configuarion of:
a) H, b)Li c)O, d)Be, e)F   f) Ne  g) Na  h)Cl i)Ar

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

Consejo seguridad nuclear

For this activity You must visit Visita Virtual CSN

• What does radioactivity consist of?
• What are the three main types of radioactive emmisions?
• Explain the interior of a nuclear reactor and the safety equipment. 
• What can they do With the nuclear waste?
  
  

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.

Problems Matter 3ESO

1. Explain what is and give examples of: a) homogeneus
   
   Mixture; b)element c)heterogeneus mixture d)compound
2.  How doesw KMT explain? a) we only know the taste of a soup if we take it, but we can smell it from far away b)Solids have a constant shape and volume c)gasses can be compressed, solids and liquids cannot d)A punctured tyre quickly desinflates, even if the hole is tiny
3. Which are the properties of the 3 aggregation states?
4. Supposse a gas at 26,85ºC  (convert to K). Its volume is 50 L and its pressure 2 atm. What will be its new volume if:   a) The new temperature is 600k at 2 atm. b)At 300 K, the new pressure is 4 atm c)At 600 K, the new pressure is 1 atm

Problems Matter 3ESO

Explain the meaning and give examples of
Mixture
Element
Heterogeneus mixture
Compound