91Ó°ÊÓ

Predict whether each substance listed will conduct electricity, dissolve in water, and/ or conduct electricity once it has dissolved. Explain your thinking in each case. \(\begin{array}{ll}{\text { a. } \mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}(l)} & {\text { acetone }} \\ {\text { b. } \operatorname{Ti}(s)} & {\text { titanium }} \\ {\text { c. } \operatorname{liNO}_{3}(s)} & {\text { lithium nitrate }} \\ {\text { d. } \operatorname{Cu} Z n(s)} & {\text { bronze }}\end{array}\)

If you measure the mass of the nickel strip before and at er plating copper, do you expect the mass to change? Explain your thinking.

Suppose you have a mixture of sodium chloride, \(\mathrm{NaCl}\) , and carbon, C. Explain how you can use water to separate the two substances.

Suppose that a classmate claimed that the nickel in the electroplating lab changed into copper. Provide an argument to prove that this is not true.

Explain why substances do not simply crumble into piles of atoms.

Explain why copper is used as wire, but copper chloride is not.

Determine the type of bonding in each substance. a. \(\operatorname{zin} c, Z n(s)\) b. propane, \(C_{3} H_{8}(l)\) c. calcium carbonate, \(\mathrm{CaCO}_{3}(s)\)

Will each of these substances dissolve in water? Explain your thinking. a. Ca \(\quad\) b. \(\operatorname{NaNO}_{3} \quad\) c. Si \(\quad\) d. \(\mathrm{CH}_{4} \quad\) e. CuSO \(_{4}\)

Based on physical properties, which of these substances is an ionic compound? Explain your reasoning. \(\begin{array}{llll}{\text { A. hair gel }} & {\text { B. silver bracelet }} & {\mathrm{C} \text { . motor oil }} & {\text { D. baking soda }}\end{array}\)

In the copper cycle from Lesson \(7,\) you saw that nitrogen dioxide, \(\mathrm{NO}_{2}(g),\) formed when copper, \(\mathrm{Cu}(s),\) was dissolved in nitric acid. How would you classify the bonding in \(\mathrm{NO}_{2}(g) ?\) Explain.