Skip to main content
Chemistry LibreTexts

Descriptive Chemistry II (Worksheet)

  • Page ID
    14871
  • Name: ______________________________

    Section: _____________________________

    Student ID#:__________________________

    Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

    Q1

    Which of the following properties of the alkaline earth metals decreases with increasing atomic weight?

    1. ionic radii
    2. ionization energy
    3. atomic radii
    4. activity
    5. atomic number

    Q2

    In a surprisingly large number of their properties beryllium resembles aluminum, and boron resembles silicon. Such a relationship is called:

    1. amphoterism
    2. an allotropic relationship
    3. a diagonal relationship
    4. the periodic law
    5. an isoelectronic series

    Group 1

    1. What is origin of the name "alkali Metals"?
    2. Why are the alkali metals stored under oil?
    3. Give two properties of the alkali metals?
    4. Going down the Group, do the Alkali Metals become more reactive?
    5. Write the chemical equation for the reaction when Potassium burns in air.
    6. Write the Balanced Equation for the reaction between Sodium and Water.
    7. Which of the following is NOT true for the Group 1A elements?
      1. Most of them are soft, silvery corrosive metals.
      2. Their atomic radii increases with increasing molecular weight.
      3. They are named the alkaline earth metals.
      4. They are excellent conductors of heat and electricity.
      5. They exhibit a +1 oxidation state in compounds.
    8. When an alkali metal is exposed to water, a violent exothermic reaction occurs where a hydroxide and hydrogen gas are produced. What is the balanced chemical equation for the reaction of sodium with water?

    Group 2

    1. What is origin of the name "alkaline Earth Metals"?

    Group 13

    12. T/F In reality, aluminum forms a protective layer and does not react with water.

    13. Which statement about Gallium is false?

    1. It melts on contact with human hands
    2. It can combine with aluminum to reduce water
    3. It is mainly found in the oxidation state +1
    4. It can form a good source of hydrogen

    14. T/F Thallium is highly toxic and therefore it is commonly used for rat poisons and insecticides in the United States.

    15. Boron:

    1. has the electron configuration [Ne] 2s22p1
    2. is the first metal of Group 13.
    3. has an atomic number 6.
    4. is an important element that we use in our daily lives.
    5. All of the above is correct.

    16. Aluminum Oxide:

    1. has poor corrosion resistance
    2. is not a very good thermal insulator
    3. in its crystalline form it is called corondum
    4. is not a very reactive metal

    17. T/F Aluminum is amphoteric

    18. Which element is the only metalloid in the boron family?

    19. When beryllium reacts with a halide, which of the following is true?

    1. It acts as a Lewis base
    2. It forms a covalent bond
    3. It forms a Lewis acid
    4. It forms a neural molecule

    20. What is the electron configuration of thallium?

    21. Which statement is False?

    1. Thallium is the heaviest element.
    2. Boron has the highest melting point.
    3. Electron potential increases going down the group.
    4. Thallium has the lowest ionization energy.
    5. All of the above are correct.

    Group 14

    1. Recall the metallic properties. What makes tin and lead "poor" metals?
    2. What makes graphite such a good material for pencil lead?
    3. What makes diamonds so hard?
    4. Why is tin used to plate iron cans?
    5. Why are +2 and +4 the most common oxidation states of metals in this group?

    Group 15

    1. What kind of bond does N2 have?
    2. Which Group 15 element has a greatest atomic radius?
    3. Which Group 15 element is the strongest reducing agent?
    4. What is the common oxidation state of all Group 15 elements?

    Group 16

    1. What is the origin on the term Chalcogen?
    2. Which statement about the Group 16 elements is false?
      1. All have an outer electronic configuration of ns2 np4.
      2. The electronegativity of Group VIA elements decreases as one goes down the group.
      3. Most are found in sulfide deposits.
      4. Oxygen has the highest boiling point and melting point.
      5. Polonium has the smallest first ionization energy.
    3. Which of the following statements about sulfuric acid is false?
      1. It is a strong acid.
      2. One mole of sulfuric acid reacts completely with two moles of potassium hydroxide.
      3. It is often present in acid rain.
      4. During the dilution of sulfuric acid, the correct method is to add sulfuric acid to water.

    Group 17

    1. What is the origin of the name "Halogens"
    2. Going down Group 16, do the Halogens become more or less reactive?

    Group 18

    1. What is the origin of the name "Nobel Gases"
    2. What is the origin of the former name "Inert Gases" and why was it not used anymore?