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Chemistry Test 69
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Chemistry Test 69
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  • Question 1/10
    1 / -0
    Which of the following fuels causes minimum environment pollution?
    Solutions
    The environmental and health benefits are even greater when hydrogen is produced from low- or zero-emission sources, such as solar, wind, and nuclear energy and fossil fuels with advanced emission controls and carbon sequestration.
  • Question 2/10
    1 / -0
    The term reactor referred to in waste water treatment is
    Solutions

    • The term reactor referred to in waste water treatment is Aeration tank.

    •  Aeration brings water and air in close contact in order to remove dissolved gases (such as carbon dioxide) and oxidizes dissolved metals such as iron, hydrogen sulfide, and volatile organic chemicals (VOCs).

    •  Aeration is often the first major process at the treatment plant.

  • Question 3/10
    1 / -0

    The most abundant element in-universe is _______.

    Solutions
    • Hydrogen is the most abundant element in the universe. 
    • Hydrogen is the third most abundant element on the Earth's surface.
  • Question 4/10
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    Nitric acid does not react with
    Solutions
    Nitric acid is made by reaction of nitrogen dioxide (NO2) with water. Normally, the nitric oxide produced by the reaction is reoxidized by the oxygen in air to produce additional nitrogen dioxide. Bubbling nitrogen dioxide through hydrogen peroxide can help to improve acid yield. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid, though pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid. The principal chemical produced from nitric acid is ammonium nitrate. Most of this is used in fertilizers, although a relatively small amount is used to make explosives. Some nitric acid is used as an intermediate in the polymer industry, notably in the manufacture of polyamides and polyurethanes.
  • Question 5/10
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    What is an Arrhenius acid?
    Solutions
    • An Arrhenius acid is a substance that, when added to water, increases the concentration of H+ ions in the water.
    • An Arrhenius base, on the other hand, is a substance which increases the concentration of hydroxide (OH−) ions when dissolved in water. This decreases the concentration of hydronium because the ions react to form H2O molecules:H3O+(aq) + OH−(aq) ⇌ H2O(l) + H2O(l)
  • Question 6/10
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    An alloy is a mixture of _____ or more elements in which the main component is a metal.
    Solutions
    An alloy is a mixture of two or more elements in which the main component is a metal. Most pure metals are either too soft, brittle or chemically reactive for practical use. Combining different ratios of metals as alloys modifies the properties of pure metals to produce desirable characteristics.
  • Question 7/10
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    An emulsion is a colloidal solution of
    Solutions
    An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids.
  • Question 8/10
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    Sodium nitrate is useful for the production of _______.
    Solutions
    Sodium nitrate is a white solid very soluble in water. It is a readily available source of the nitrate anion (NO3−), which is useful in several reactions carried out on industrial scales for the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives and solid rocket propellant.
  • Question 9/10
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    Which one of the following is commonly used for pulp bleaching in the paper industry?
    Solutions
    • Hydrogen peroxide is used in pulp bleaching in the paper industry.
    • It’s a colourless liquid and is slightly more viscous than water.
    • It is used as an oxidizer, bleaching agent and disinfectant.
  • Question 10/10
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    Natural rubber is a polymer of __________
    Solutions
    Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water. Malaysia and Indonesia are two of the leading rubber producers.
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