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Ionic or Molecular? Table 1 provides data on the physical properties of seven compounds. Your task is to classify the compounds as either ionic or molecular. Purpose To use provided data to determine whether each of the listed compounds is ionic or molecular SKILLS Procedure A2.4 HANDBOOK 1. Copy Table 1 into your notebook. Examine the data. Analyze and Evaluate (a) Consider the differences in physical properties for ionic and molecular compounds, and predict which compounds are ionic and which are molecular. Complete the two right-hand columns of your table. Most of the substances have been discussed in this chapter. Table 1 Observations of Physical Properties of Seven Compounds, A to G Mixes or Conducts Appearance at room temperature dissolves in electricity in Compound water? water? A fine white powder only very no slightly B blue crystals yes yes C colourless liquid n/a n/a D colourless liquid no n/a E white crystals yes yes F white crystals yes no G colourless gas no n/a LL • Observing • Questioning • Researching • Planning • Controlling Variables • Analyzing • Evaluating • Hypothesizing • Predicting • Performing • Communicating (b) Which properties were the most useful in categorizing the compounds? (c) Which properties were the least useful in categorizing the compounds? ™ (d) Were there any observations that confused your decisions? Explain. Apply and Extend SKILLS B3 HANDBOOK (e) Compare and contrast the physical properties of ionic and molecular compounds. (f) Extend your table by adding three more rows. Add three more compounds of your choice. Research their properties and complete each column. (g) Suggest a use for each compound in your table. GO TO NELSON SCIENCE Melting point (°C) Boiling point (°C) Other distinguishing features Ionic or covalent? 825 (decomposes) 110 crystal structure (decomposes) pungent odour 801 186 100 96 -57