For each problem describe how you would prepare it in the lab (you can use a flow chart to illustrate the steps to follow once you have made your calculations. 1. to perform a laboratory practice, the following reagents are required to be prepared.
a). 250 ml of KOH solution 30% mass (25 points)
b). 250 ml of a 0.25M Fe2O3 solution (25 points)

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

16

explanation:

the marks go by 4s

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.