C5- Chemicals of the Natural Environment 0.0 / 5 ? ChemistryOrganic and Green ChemistryGCSEOCR Created by: emily_andCreated on: 07-05-14 11:45 Q. Name a gas in dry air that is a compound? A. Carbon Dioxide 1 of 10 Q. Explain why most molecular substances are gases. A. Because they have a low melting point and boiling point. 2 of 10 Q. What is covalent bonding? A. When atoms share electrons. 3 of 10 Q. What is the Earth's hydrosphere? A. The oceans. 4 of 10 Q. Why do solid ionic compounds form crystals? A. Because lots of oppositely charged ions strongly attract to form a lattice of built up ions. 5 of 10 Q. Why does graphite conduct electricity? A. Because is is insoluble in water and has a high melting point. 6 of 10 Q. What is an ore? A. Rocks that contain varying amounts of minerals from which metal can be extracted. 7 of 10 Q. What is electrolysis? A. The decomposition of a substance using electricity. 8 of 10 Q. Why can a molton ionic crystal act as an electrolyte? A. Because they contain free ions. 9 of 10 Q. Why have metals got high melting points and boiling points? A. Because they have very strong metallic bonds. 10 of 10
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