Question 1
Permanently hard water may be softened by
◦ boiling for 8-10 minutes.
◦ precipitating sodium salts.
◦ exchanging sodium for calcium ions.
◦ adding a small amount of organic material.
Question 2
Plant sterols have been shown to
◦ lower blood cholesterol levels.
◦ increase blood cholesterol levels.
◦ have no effect on blood cholesterol levels.
◦ be easily absorbed from the human digestive track.