Section 1
Chemical Names and Symbols
Describe the dif erence between an element and a compound.
What is meant by physical form?
How many elements are included in the chemical formula for sodium nitrate, $\mathrm{NaNO}_{3} ?$ Name them.
What is the difference between $\mathrm{NaOH}(s)$ and $\mathrm{NaOH}(a q) ?$
You see a ring with a stone that looks like a diamond but wonder why it’s so cheap. The jeweler says the stone is a type of diamond called cubic zirconia. How can chemical symbols show that cubic zirconia is not a diamond?
You find two containers on a chemical shelf, one labeled $\mathrm{Cu}_{2} \mathrm{O}(s)$ and a second labeled $\mathrm{CuO}(s) .$ Are these substances the same or different? Explain.