What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called? A. Paint B. GlassC. Gun Powder D. Cement

Covalent network crystals have_____________? A. higher melting point then molecular crystals B. lower melting point then molecular crystals C. discrete molecules linked by Van der waals forces D. hydrogen bonding

All of the following substances are crystalline except_____________? A. Ice B. Diamond C. Sucrose D. Plastic

Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________? A. ionic substances B. metallic substances C. molecular solids D. covalent network solids

Which of the following is a substance? A. Sea water B. Brass C. Tape water D. Graphite E. Sand In chemistry, a substance refers to a matter which has specific composition and specific properties which do not change. A substance…

Sodium carbonate is produced by____________? A. haber process B. Amonia solvay process C. decons process D. lead chamber process  

Electron was discovered by? A. Michael Faraday B. James Maxwell C. Yuri Gagarin D. J.J Thomson