3ESO Structure of Matter.

1. For the Species   
   
    indicate the number of electrons,
   
   neutron, protons.
2. We have 3 different atoms: a)Z=2; b)Z=7; c)Z=11. Write their electrónic configuration, period, Group, aggregation state, stable ions, stoichiometry of the compound b-c
3. Tell which type of radioactive emmission: a)is formed by electrons b)is most penetrating c)is formed by heaviest particles

4ESO Stoichiometry as a whole

1. When 200 g of NaHCO3 95% react with HCl 0.5M they produce Sodium chloride, water and a gas which provoques global warming  is released. a) Write the chemical equation  (balance it). b)Determine the volume of HCL 0.5M you need c)Determine the volume of gas measured at 20°C and 0.9 atm.
2. In a blast furnace, Iron is reduced from Fe2O3 to Fe (steel in fact) with graphite (C), which turns into CO2. Write the chemical equation. Determine the mass of graphite they need to get a kg of steel, and the volume of CO2 measured at 500°C and 2.5 atm.

Data: Pm Cl:35.5; Na 23; C 12; O 16; H 1 g/mol R=0.082 atm•l/Kmol

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