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    oxygen primary 6 2011

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    atwa
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    تاريخ التسجيل : 22/04/2009
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    oxygen primary 6 2011

    مُساهمة من طرف atwa في الإثنين نوفمبر 22, 2010 6:34 am

    Oxygen
    The burning (combustion).الاحتراق : It is a rapid combination between oxygen and element and produces heat and light
    The oxidation: الأكسدة It is a slow combination between oxygen and element in the presence of moisture (water).
    Catalyst. العامل الحفاز:It is a chemical substance that remains without a change in its quantity and properties during the chemical reaction.
    * disadvantages of Rusting iron.
    causes erosion of ironware such as bridges pillars that causes their damage
    * Oxygen cylinder is used when a person climbs a mountain.
    Because oxygen becomes lighter when we rise above the Earths surface.
    **Oxygen is collected by downward displacement of water.
    Because oxygen scarcely dissolves شحيح الذوبان in water.
    **The percentage of oxygen remains constant in the atmosphere.
    Because green plants produce oxygen gas during photosynthesis process
    **. The atmosphere is importance for the life on the Earth.
    Because the atmosphere:
    - absorbs ultraviolet radiation coming from outer space.
    - adjusts the temperature of the Earths surface.
    . Choose the correct answer:
    1. The precentage of oxygen gas in the atmosphere is
    a. 0.03% b. 78% c. 21% d. 1%
    2. The most abundent gas in the atmosphere is gas.
    a. oxygen b. nitrogen c. carbon dioxide d. water vapor
    3. Ozone molecule is composed of oxygen atom.
    a.1 b.2 c.3 d.4
    4. The gas that doesn’t burn but helps in buring is
    a. nitrogen. b. oxygen. c. hydrogen. d. carbon dioxide.
    5. Nitrogen gas forms of the volume of atmosphere.
    a. 21% b. 87% c. 78% d. 1%
    6. The temperature of the oxyacetylene reaches
    a. 35 °c. b. 350 °c. c. 3500 °c d. 200 °c.
    Write the scientific term for each of the following:
    1. A mixture of different gases that surrounds the Earth’s surface.
    2. A gas that scarcely dissolves in water.
    Give reason for each of the following
    1. The percentage of oxygen remains constant in the atmosphere.
    2. Oxygen is collected by downward displacement of water.
    3. The atmosphere has a great importance for the continuity of life on the planet Earth.
    What is meant by each of the following:
    1. The atmosphere.
    *2. The burning (combustion).
    *3. The oxidation.
    4. Catalyst.
    Write scientific term :
    *1. It is a rapid combination between oxygen and element and produces heat and light
    *2. It is a slow combination between oxygen and element in the presence of moisture (water).
    3. It is a chemical substance that remains without a change in its quantity and properties during the chemical reaction.

      الوقت/التاريخ الآن هو الأربعاء ديسمبر 13, 2017 3:41 am