sábado, 28 de enero de 2017

Radioactivity

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    lunes, 16 de enero de 2017

    A modern version of the gold foil experiment

    A modern version of one of the most important experiment in the history of science.


    Watch the video and answer the questions

    1.- Who made this experiment more than one hundred years ago?
    2.- Which kind of particles are used in this experiment?
    3.- Why some of the particles pass straight ahead but others are deflected?
    4.- What does 1.5 microns refers to?
    5.- What does the bell sound represent?
    6.- Mention two differences between the original experiment and the modern one.
    7.- How many particles per second are detected by each detector?
    8.- What conclusion can we make from the results of this experiment?
    a) J. J. Thomson was right.
    b) Atoms are mostly empty space.
    c) Atoms are rigid spheres.
    d) None of above.
     9.- What happen to the particles passing closer the nucleus?

    domingo, 15 de enero de 2017

    Chemical equations calculations. Exercise 6.


    Alba Muñoz 4º B

    Concentration. Exercise 8.

    We need to prepare 150 ml of a 20 g/L solution of iodine. How much iodine and water do we need? Explain how to prepare this solution in the lab.

    Enrique Borrego 3º A


    Concentration. Exercise 10.

    When 33g of sugar are dissolved in 198 g of water we get 0,22 liters of solution. Calculate the mass concentration (g/L) and the percent of mass of the solution.


    María Ordóñez 3º A

    Concentration. Exercise 6.

    A solution has been prepared with 30 g of sugar solved in water till we get 200 ml of solution. Which is its mass concentration of sugar in g/L?


    Mª Dolores Godino 3º A

    Concentration. Exercise 7.

    We weight 5 g of sodium chloride and water is added till we have 250 ml of solution. What mass concentration (g/L) of sodium chloride we get?

    María Benitez 3º A

    sábado, 14 de enero de 2017

    Concentration. Exercise 1.


    Ana Quiñones 3º B

    Concentration. Exercise 4


    Carmen Mirón 3º B

    Concentration. Exercise 9.

    We need to prepare 300 ml of a ferric sulfate solution for fertilizing plants with a 12 g/L mass concentration. How much ferric sulfate mass do we need? Explain how to prepare this solution in the lab.
    Ana Ordóñez 3º A

    Concentration. Exercise 3.

    María del Arco 3º A

    Concentration. Exercise 5.


    Pedro Suárez 3º B

    Chemical equations calculations. Exercise 9.

    What mass of sulfuric acid do we need to react with 10 g of aluminum? The unbalanced equation for this process is:  Aluminum + sulfuric acid → Aluminum sulfate + hydrogen (H2). How many moles of hydrogen are produced? What is its volume at 800 mmHg and 20 ºC?


    Gonzalo Rodero 4º B

    Chemical equations calculations. Exercise 5.

     If 8g of CO2 is produced by the combustion reaction of C5H12, calculate the number of grams of C5H12 which was burned.
    Carmen Maján 4º B


    Chemical equations calculations. Exercise 20.


    Jin Suk Oh 4º A

    viernes, 13 de enero de 2017

    Chemical equations calculations. Exercise 13

    .4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g). How many moles of each reactant were there if 13.7 moles of N2(g) is produced? What volume of nitrogen is produced at 1.3 atm and 27 ºC?

    Gabriel Ballesteros 4º A

    Chemical equations calculations. Exercise 10.


    Inés Cabello 4º B

    Chemical equations calculations. Exercise 2.

    In the combustion reaction C8 H18 + O2 → CO2 + H2 O,.
    a) What mass of water will be produced when 27.3 g of C8 H18?
    b) How many molecules of CO2 will be produced?
    c) How many atoms of H are in 2 mol of C8 H18?



    Julia Arroyo 4º A

    Chemical equations calculations. Exercise 8

    Photosynthesis is a chemical reaction in plants used to produce oxygen and glucose. If a plant uses 6.3 g CO2, how much water (in grams) is needed to complete the reaction? How much glucose will be formed?

    Marina Polo 4º B

    Chemical equations calculations. Exercise 12.

    .Given the reaction: Zn + CuCl2 → ZnCl2 + Cu. How many moles of copper will be produced by reacting 23.5 g of Zn? What mass of copper(II) Chloride is needed? 


    David Sánchez 4º B

    Chemical equations calculations. Exercise 4.

    Marta Thovar 4º B

    Chemical equations calculations. Exercise 18.

    Using the following equation: Pb(SO4)2 + LiNO3 → Pb(NO3)4 + Li2SO4. How many grams of lithium nitrate will be needed to make 250 grams of lithium sulphate, assuming that you have an adequate amount of lead (IV) sulphate to do the reaction?


    Andrés Meléndez 4ºA

    Concentration. Exercise 15

    Exercise 15. As we saw in the lab, a 330-milliliter Coca-Cola can contains 35 g of sugar. Knowing that the mass of 330 mL of Coca-Cola is 343.86 g, calculate the sugar concentration in Coca Cola in g/L and percentage by mass.

    Andrea Rey 3º B
      

    Concentration. Exercise 14

    A blood test finds that the cholesterol concentration in a person’s blood is 2.05 g/L. What mass of cholesterol does this person contains if he or she has five liters of blood? What mass of cholesterol did the lab actually find if the test mass made with 10 mL of blood?
     

    Carlota Cuellar 3º A

    Concentration. Exercise 12


    Chemical equations calculations. Exercise 7.

    If 33.6 liters of NO2 is decomposed, find the volumes of N2 and O2 produced at STP.


    Ángela Polo 4º B

    One comment. We don't need to use fractions to balance a chemical equation. This equation could be balanced also like this: 
    2 NO2 → N2 + 2 O2

    Concentration. Exercise 11

    Air is gaseous solution where the concentration of oxygen is 21 % by volume. How many liters of air are there in 25 liters of air? What volume of air contains 30 liters of oxygen?


    Chemical equations calculations. Exercise 16.


    Ángela Polo 4º B

    Chemical equations calculations. Exercise 14.


    Alberto Blanco 4º A

    Chemical equations calculations. Exercise 3.


    Rafael Tejada 4º B

    Chemical equations calculations. Exercise 1.


    Celia Álvarez 4º A

    Chemical equations calculations. Exercise 11.

    A common pollutant in atmosphere is the sulphur dioxide from the power stations. Sulphur dioxide can be treated by reaction with hydrogen sulphide which produce sulfur and water.
    a) Write and balance the chemical equation of this process.
    b) If a power station produces 500 kg of SO2 per day, how many liters of H2S will be needed to treat it? Suppose the process occur at STP conditions.


    Tomás Rodríguez 4º B

    Chemical equations calculations, Exercise 19.


    Ana Vila 4º B

    Chemical equations calculations. Exercise 15.


    Concentration. Exercise 13


    Alba Cruz 3º A

    Chemical equations calculations. Exercise 6.


    Ana Vázquez 4º B

    Concentration. Exercise 2.

    Exercise 2. A glucose solution is 30% mass. How much glucose and water has 100 g of solution?


    Pedro Pablo Álvarez 3º A

    Chemical equations calculations. Exercise 17.

    Using the equation: NaOH + H2SO4 → Na2SO4 + H2O. How many grams of sodium sulphate can be formed by reacting 200 g of sodium hydroxide with an excess of sulphuric acid?

     Álvaro Mejías 4º A

    miércoles, 11 de enero de 2017

    How big is a mole?

    Geometría molecular

    Magnífica simulación de la Universidad de Colorado para estudiar la forma de las moléculas mediante la TRPEV.

    Moléculas orgánicas 3D

    Magnifica aplicación web para visualizar moléculas orgánicas en 3D desarrollada por el profesor Paco Ginabel del IES Sierra de San Quílez de Binefar.


    Ejercicios:  http://iesbinef.educa.aragon.es/fiqui/jmol/testjsmol.htm

    http://iesbinef.educa.aragon.es/fiqui/jmol/testjsmol.htm

    Thomson experiment: the cathode ray tube