1. Recall that soluble ionic compounds dissociate in water. As a review, write the equation for the
dissociated ions for the following compounds.
A. Ca(NO$_3$)$_2$
B. magnesium chloride
2. As a review, do insoluble ionic compounds dissociate in water?
3. Using information from the background, classify each of these as a pure substance, heterogeneous
mixture, or solution.
A. Windex window washing fluid
B. River water with dirt suspended in it
C. Poland Spring water
4. Circle any of the compounds below that are ionic based on their chemical formula.
A. sodium chloride
B. CH$_3$CH$_2$OH
C. MgCO$_3$
D. Na$_2$SO$_4$
6. For the compound methanol, CH$_3$OH, draw dashed lines to show how it hydrogen bonds with water.
Background
Mixtures contain two or more elements or compounds. A mixture that has distinct boundaries between
components is called a heterogeneous mixture. Homogeneous mixtures have a uniform composition, and
when they are clear they are called solutions.
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