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7.1 Introduction and key concepts

Chemical bonding

Textbook Exercise 6.6

Explain the meaning of each of the following terms

  1. ionic bond
  2. covalent bond
Solution not yet available.

Which ONE of the following best describes the bond formed between carbon and hydrogen?

  1. metallic bond
  2. covalent bond
  3. ionic bond
Solution not yet available.

Which of the following reactions will not take place? Explain your answer.

  1. \(\text{H} + \text{H} \rightarrow \text{H}_{2}\)

  2. \(\text{Ne} + \text{Ne} \rightarrow \text{Ne}_{2}\)

  3. \(\text{Cl} + \text{Cl} \rightarrow \text{Cl}_{2}\)

Solution not yet available.

Draw the Lewis structure for each of the following:

  1. calcium

  2. iodine

  3. hydrogen bromide \((\text{HBr})\)

  4. nitrogen dioxide \((\text{NO}_{2})\)

Solution not yet available.

Given the following Lewis structure, where X and Y each represent a different element:

7c199db46063cc417c5501d6d4cad73f.png

  1. What is the valency of X?

  2. What is the valency of Y?

  3. Which elements could X and Y represent?

Solution not yet available.

Complete the following table:

\(\text{K}^{+}\)

\(\text{Ca}^{2+}\)

\(\text{NH}_{4}^{+}\)

\(\text{OH}^{-}\)

\(\text{O}^{2-}\)

\(\text{NO}_{3}^{-}\)

\(\text{PO}_{4}^{3-}\)

\(\text{K}^{+}\)\(\text{Ca}^{2+}\)\(\text{NH}_{4}^{+}\)
\(\text{OH}^{-}\)\(\text{KOH}\)\(\text{Ca}(\text{OH})_{2}\)\(\text{NH}_{4}\text{OH}\)
\(\text{O}^{2-}\)\(\text{K}_{2}\text{O}\)\(\text{CaO}\)\((\text{NH}_{4})_{2}\text{O}\)
\(\text{NO}_{3}^{-}\)\(\text{KNO}_{3}\)\(\text{Ca}(\text{NO}_{3})_{2}\)\(\text{NH}_{4}\text{NO}_{3}\)
\(\text{PO}_{4}^{3-}\)\(\text{K}_{3}\text{PO}_{4}\)\(\text{Ca}_{3}(\text{PO}_{4})_{2}\)\((\text{NH}_{4})_{3}\text{PO}_{4}\)

Potassium dichromate is dissolved in water.

  1. Give the name and chemical formula for each of the ions in solution.

  2. What is the chemical formula for potassium dichromate?

  1. Potassium ion: \(\text{K}^{+}\)

    Dichromate ion: \(\text{Cr}_{2}\text{O}_{7}^{2-}\)

  2. \(\text{K}_{2}\text{Cr}_{2}\text{O}_{7}\)

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7.1 Introduction and key concepts