http://www.ck12.org Chapter 2. Matter and Change
- Carbonated beverages contain carbon dioxide gas that is dissolved in solution. Do you think a carbonated
beverage is a mixture or a pure substance? Explain. - Classify each of the following as a chemical change or a physical change.
a. Sugar dissolves in water.
b. A peach rots.
c. Icicles melt in the warm sunlight.
d. A baking cake rises in the oven.
e. A leaf changes its color in the fall.
f. Food coloring is added to a glass of water. - TheFigure2.14 shows two different mixtures. The mixture on the left is comprised of muddy water, while
the mixture on the right is a mixture of sugar and water. Describe how you might go about separating out the
components of each of these mixtures.
FIGURE 2.14
(left) Muddy water. (right) Sugar water.Further Reading / Supplemental Links
- School Science Lessons: http://www.uq.edu.au/_School_Science_Lessons/topic10.html
- Examples of laboratory techniques used for separating mixtures at Science Park: http://sciencepark.etacude.c
om/projects/ - Ophardt, Charles E. 2011. Virtual Chembook. Elmhurst College 20032011. Available from: http://www.e
lmhurst.edu/~chm/vchembook/index.html
Points to Consider
- We have thus far assumed that elements cannot be broken down further into constituent parts. Is this com-
pletely true? - What do you suppose elements are comprised of and how might you be able to distinguish or measure the
components of an element?