# Teaching STEM lessons with the objects and collections of Museums (2)

## Chemistry

• The Environment Museum of Stymphalia (Cont.)

Activity: How was the Stymfalia lake formed?

Questions:

The basic chemical compound which has contributed to the formation of the lake is:

A. Calcium carbonate (limestone)
B. Sodium chloride
C. Potassium nitrate
D. Hydrochloric acid

ii) Fill in the blanks with one of the words given in brackets on these proposals chemical reactions, which give the product as a compound that has contributed to the formation of the Lake:

Acid + base = …………………… + Water (acid – salt- base- Hydrogen chloride-calcium-Clay)

Carbonic acid + calcium oxide + water ……………………….

(Calcium carbonate oxide of calcium nitrate carbonate carbon-carbon acid clay)

iii) Based on the above chemical reactions proposals to fill the chemical elements that are missing from the following reaction:

iv) Fill the gaps on these proposals, which refer to the chemical properties of the salts:

• The salts are ……………………… substances widely distributed in nature.
• Most components of the ………………….. ………………. bark …… are salts.
• Calcium sulfate (CaSO4) is ……………………… salt, because in 100 g of water at 25o C can dissolve the very 0.21 g calcium sulfate

Activity: Mathematical calculations

Questions

i)

1. The values ​​of the amounts ‘kg olives’ collected from the olive grove and ‘kg oil’ produced at the mill is like figures.
2. If you increase the “kg olives ‘collected from the grove; then will double the” kg oil’ produced at the mill.
3. If you reduce the ‘kg olives’ collected from the grove ‘then it halved the “kg oil’ produced at the mill.

ii) You can help the grower, by completing the following table, based on your mathematical skills, calculate how many kilos of oil will produce, if transferred to the mill one ton Kalamata olives 25% yield;

## Geometrical calculations

• #### The Open Air Water-Power Museum

Activity: Geometrical calculations. Perimeters, Areas and volume of materials.

All educational scenarios, guides for teachers and worksheet for each museum are published in: http://www.piop.gr/el/Activities/Pafsanias.aspx

Article written by: Argyri Panagiota, STEM teacher, Greece. The second part of this article will be published next week.