1. Hardness is the resistance to what?
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2. Ceramics include clay, glass and what?
3. In the process of 'wet scrubbing,' waste gases are sprayed with water and what?
- Calcium oxide
- Calcium suplhate
- Calcium Carbonate
4. The Leblanc process produces this
- Sodium chloride
- Calcium carbonate
- Sodium carbonate
- Calcium sulphate
5. Thermoplastics like acrylic do what when heated?