Material Science and Technology Set 3

Making cement and glass ✘ Disinfecting water of ponds ✘ Cutting very hard substances ✘ Making casts for statues ✔

Silicon dioxide ✘ Germanium oxide ✘ A mixture of germanium oxide and silicon dioxide ✘ Sodium silicate ✔

Bitumen ✘ Anthracite ✘ Lignite ✘ Peat ✔

Oxygen and hydrogen ✘ Oxygen, hydrogen, acetylene and nitrogen ✘ Oxygen, acetylene and argon ✘ Oxygen and acetylene ✔

3 %

✘

3.5 %

✘

2.5 %

✘

2 %

✔

Transition metals ✘ Main group metals ✘ Alkali metals ✘ Rare metals ✔

Teflon ✘ PVC ✘ Black paint ✘ Polystyrene ✔

Sodium carbonate ✘ Alum ✘ Potassium permanganate ✘ Lime ✔

Krypton ✘ Xenon ✘ Neon ✘ Helium ✔

Iron, Zinc, Titanium ✘ Iron, tin ✘ Iron, Brass, Tin ✘ Copper, Tin ✔