Question: Name one metal and one none-metal which exist as liquids at room temperature.
Answer: Mercury and Bromine
Question: Name a metal which is soft and non-metal which is hard?
Answer: Sodium and diamond
Question: Name a non-metal which is a good conductor of electricity.
Question: Name a liquid which can be classifieds a pure substance and conducts electricity.
Question: Name a solid, a liquid and a gaseous non-metal.
Answer: Carbon, bromine and Hydrogen
Question: Which allows metals to be hammered in then sheets?
Question: Which enable metals to be drawn into wires?
Question: What is meant by saying that metals are malleable and ductile?
Answer: This means that metals can be hammered into thin sheets as well as drawn into thin a hammer.
Question: What is mean by saying that metals are sonorous?
Answer: This means that metal produce a ringing sound when struck
Question: What is meant by saying that metals are lustrous?
Answer: This means that has a shining surface.
Question: What are pure substances? Give eg of pure substances.
Answer: A substance which is made up of only one kind of particles is known as a pure substances. For Eg: Sugar and iron.
Question: State 3 reasons why you think air is a mixture and water is a compound.
Answer: They are:
- Water is made by the chemical bonding of Hydrogen and oxygen particles where as air is a simple mixture of diffused gases.
- The ratio of H and O2 in water is 2:1 where as in air there is no specific ration of its constituent gases.
- Water is made up of similar group of molecules where as the air have different concentration of different places.
Question: Name two solid, 2 liquid, 2 gaseous elements at room temperature.
Answer: Liquid = Bromine and mercury
Gas = Hydrogen, Nitrogen
Solid = Carbon, Sulfur
Question: Compare the properties of metal and non-metal on the basis of malleability ductility and electrical conductivity.