Chemical Reaction of Potassium Dichromate with Alcohol
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Questions and Answers

What is the colour of potassium dichromate?

  • Light orange
  • Clear
  • Blue-green
  • Dark orange (correct)

    • The amount of light that passes through the control vial affects the gauge in the breathalyzer.

    False

    What is the estimated cost of impairment-related driving deaths, injuries, and property damage-only crashes in Canada in 2009?

    $20.15 billion

    The greater the amount of __________ present, the more potassium dichromate is broken down.

    <p>alcohol</p> Signup and view all the answers

    Match the following colours with the level of alcohol present:

    <p>Dark orange = Low level of alcohol Light orange = Moderate level of alcohol Clear = Higher level of alcohol Blue-green = Highest level of alcohol</p> Signup and view all the answers

    What type of ions are produced due to the breakdown of potassium dichromate?

    <p>Chromium (III) ions</p> Signup and view all the answers

    The knob in the breathalyzer must be turned to bring the gauge to its resting place.

    <p>True</p> Signup and view all the answers

    What is the purpose of the control vial in the breathalyzer?

    <p>To compare with the test vial</p> Signup and view all the answers

    What is the purpose of the silver nitrate in the Breathalyzer reaction?

    <p>To act as a catalyst</p> Signup and view all the answers

    The Breathalyzer reaction takes approximately 10 seconds to complete.

    <p>False</p> Signup and view all the answers

    What is the colour of the potassium dichromate solution?

    <p>orange</p> Signup and view all the answers

    The reactant that breaks down to produce a colour change in the Breathalyzer reaction is ______________.

    <p>potassium dichromate</p> Signup and view all the answers

    What is the product of the oxidation of alcohol in the Breathalyzer reaction?

    <p>All of the above</p> Signup and view all the answers

    The Breathalyzer reaction involves the oxidation of ethanol.

    <p>True</p> Signup and view all the answers

    Match the following reactants with their corresponding formulas:

    <p>Potassium dichromate = 2K2Cr2O7 Sulfuric acid = 8H2SO4 Ethanol = 3CH3CH2OH Silver nitrate = AgNO3</p> Signup and view all the answers

    What is the result of the oxidation of alcohol in the Breathalyzer reaction?

    <p>Colour change from orange to blue-green</p> Signup and view all the answers

    What is the primary reason the Intoxilyzer was developed?

    <p>To lower the incidence of operator error and eliminate the need for chemical compounds</p> Signup and view all the answers

    A woman will have a lower blood alcohol concentration than a man with the same body weight and drinking the same amount of alcohol.

    <p>False</p> Signup and view all the answers

    What causes the chemical bonds within a molecule to bend or stretch?

    <p>Exposure to infrared light</p> Signup and view all the answers

    The Intoxilyzer measures the wavelengths of the chemical bonds in alcohol and the _____________ of infrared light absorbed.

    <p>amount</p> Signup and view all the answers

    Match the following principles of breathalyzer operation with their descriptions:

    <p>Infrared light absorption = Causes chemical bonds to bend or stretch Chemical bonds = Absorb infrared light at different wavelengths Molecule movement = Affected by exposure to infrared light</p> Signup and view all the answers

    Study Notes

    Potassium Dichromate Reaction

    • Potassium dichromate is dark orange, but when broken down, it fades to a lighter orange.
    • The greater the amount of alcohol present, the more potassium dichromate is broken down.
    • Increasingly larger amounts of alcohol cause the solution to progress from light orange, to clear, to blue-green due to the production of chromium (III) ions.

    Breathalyzer Test

    • A person suspected of having consumed alcohol blows into the mouthpiece of the Breathalyzer.
    • The breath sample goes through an open glass test vial containing a solution of potassium dichromate, sulfuric acid, water, and silver nitrate.
    • If alcohol is present, a chemical reaction occurs, producing a colour change.

    Chemical Reaction

    • The reactants involved in the oxidation of alcohol are potassium dichromate, sulfuric acid, ethanol, water, and silver nitrate.
    • The oxidation of alcohol produces chromium (III) sulfate, potassium sulfate, acetic acid, and water.
    • The reaction is complete in approximately 90 seconds.
    • Silver nitrate is a catalyst and does not change during the reaction.

    How Breathalyzer Determines BAC

    • When alcohol is oxidized, the reactant (potassium dichromate) breaks down to produce a colour change.
    • The test vial is compared to a control vial in a photocell system to quantify the amount of alcohol present.
    • The amount of light that passes through each vial produces an electric current, causing a gauge to move.
    • The level of alcohol is determined by the amount the gauge must be turned to return to rest.

    Did You Know?

    • In 2009, impairment-related driving deaths, injuries, and property damage-only crashes in Canada cost $20.15 billion.

    Intoxilyzer

    • The Intoxilyzer was developed to lower the incidence of operator error and eliminate the need for chemical compounds.
    • Molecules are constantly moving, and exposure to infrared light causes changes in this movement.
    • The chemical bonds within a molecule absorb infrared light at different wavelengths, which helps to identify the alcohol molecule.
    • The amount of infrared light absorbed determines the quantity of alcohol.

    Interesting Facts

    • Women have a higher blood alcohol concentration than men with the same body weight and drinking the same amount of alcohol due to their higher fat content and lower water content.

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    Description

    This quiz is about the reaction of potassium dichromate with alcohol, which causes a change in color from dark orange to light orange.

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