Chemistry: Properties of Electrolytes
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Questions and Answers

What is a key property of electrolytes?

  • They are electrically neutral
  • They are poor conductors of electricity
  • They are always solids
  • They contain electric charges (correct)

    • Electrolytes are unable to conduct electricity.

    False

    What is the main property, besides containing electric charges, that electrolytes have due to those charges?

    Conduct electricity

    Electrolytes conduct ____ because they contain electric charges.

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

    Match the characteristic to the correct concept:

    <p>Contains electric charges = Electrolyte property Can conduct electricity = Electrolyte property</p> Signup and view all the answers

    What is the term for a pure substance that conducts electricity?

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

    Electrolytic dissociation is the process where molecules combine to create ions.

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

    What are the two types of ions produced during electrolytic dissociation?

    <p>positive and negative</p> Signup and view all the answers

    During electrolytic dissociation, NaCl separates into ____ and Cl-.

    <p>Na+</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Electrolyte = Pure substance that conducts electricity Electrolytic Dissociation = Process where molecules separate into ions Ions = Positively or negatively charged particles</p> Signup and view all the answers

    What does a coefficient in a molecular formula represent?

    <p>The number of molecules.</p> Signup and view all the answers

    In the molecule 3H2O, there are a total of 5 hydrogen atoms.

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

    How many oxygen atoms are present in the formula 4CO2?

    <p>8</p> Signup and view all the answers

    In the formula 5N2, the index number of nitrogen is ______.

    <p>2</p> Signup and view all the answers

    Match the terms with their meanings:

    <p>Compound = A molecule composed of different types of atoms. Coefficient = The number in front of the chemical formula, representing the number of molecules. Index = The small number after the element symbol, representing the number of atoms of that element within a molecule.</p> Signup and view all the answers

    What term describes an atom that has gained or lost electrons?

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

    An atom becomes a negative ion when it loses electrons.

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

    What rule states that atoms tend to gain, lose, or share electrons to achieve a full outermost electron shell?

    <p>octet rule</p> Signup and view all the answers

    A positive ion has more ______ than electrons.

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

    What do the charges listed next to the elements' symbols indicate?

    <p>The number of electrons lost or gained by an atom.</p> Signup and view all the answers

    Match the following ions with the number of electrons lost or gained:

    <p>Na⁺ = Lost one electron Mg²⁺ = Lost two electrons Cl⁻ = Gained one electron O²⁻ = Gained two electrons</p> Signup and view all the answers

    What does the pH scale measure?

    <p>The acidity or basicity of a solution</p> Signup and view all the answers

    Which of the following best describes the relationship between acids and electrical conductivity?

    <p>Acids are electrolytes and do conduct electricity.</p> Signup and view all the answers

    Elements in the same row of the periodic table are referred to as families.

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

    A solution with a pH of 3 is considered basic.

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

    What is the unique identifier used to order the elements in the periodic table?

    <p>atomic number</p> Signup and view all the answers

    Bases react with metals.

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

    What is the pH range of an acid?

    <p>0-6.9</p> Signup and view all the answers

    What pH value represents a neutral solution?

    <p>7</p> Signup and view all the answers

    Elements like Hydrogen, Lithium, Sodium, Beryllium and Magnesium tend to ______ electrons.

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

    A substance that turns litmus paper blue is a(n) _____.

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

    A pH value of 10 indicates a ______ solution.

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

    Match the following Families from the periodic table with their descriptions:

    <p>Family I = Elements that tend to lose one electron. Family IV = Elements that can either gain or lose 4 electrons. Family V-VII = Elements that tend to gain electrons.</p> Signup and view all the answers

    Match the pH value ranges with the correct description:

    <p>0-6 = Acidic 7 = Neutral 8-14 = Basic</p> Signup and view all the answers

    Match the following terms with their corresponding properties:

    <p>Acid = Sour taste and turns litmus paper red Base = Bitter taste and feels slippery Salt = Formed from the reaction of an acid and a base Non-electrolyte = Does not conduct electricity</p> Signup and view all the answers

    How many grams are in 1 kilogram (kg)?

    <p>1000</p> Signup and view all the answers

    1 milliliter (ml) is equal to 1 liter (L).

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

    How many milligrams (mg) are equal to 1 gram?

    <p>1000</p> Signup and view all the answers

    1 liter (L) is equal to ______ milliliters (ml).

    <p>1000</p> Signup and view all the answers

    Match the following units of measurement with their correct conversions:

    <p>1000 mg = 1 g 1 g = 0.001 Kg 1 ml = 0.001 L 1000 g = 1 Kg</p> Signup and view all the answers

    Which pH value indicates neutrality?

    <p>7</p> Signup and view all the answers

    A lower pH value indicates a higher acidity.

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

    What is the effect of a one-unit change in pH?

    <p>It represents a tenfold shift in concentration.</p> Signup and view all the answers

    The darkest gray on Scale 1 represents a pH of __________.

    <p>0</p> Signup and view all the answers

    Match the pH values with their corresponding descriptions:

    <p>0 = Strongly acidic 7 = Neutral 14 = Strongly basic 3 = Weakly acidic</p> Signup and view all the answers

    What is the primary goal of atoms according to the octet rule?

    <p>To achieve a stable electron configuration</p> Signup and view all the answers

    Sodium has 8 valence electrons in its outer shell.

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

    How many valence electrons does chlorine have?

    <p>7</p> Signup and view all the answers

    When sodium loses an electron, it becomes a ______ ion.

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

    Match the following elements with their respective electron configurations:

    <p>Sodium (Na) = 2, 8, 1 Chlorine (Cl) = 2, 8, 7 Argon (Ar) = 2, 8, 8 Potassium (K) = 2, 8, 8, 1</p> Signup and view all the answers

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