(ii) Molecules: The smallest particle of a substance that has all of the physical and chemical properties of that substance. (i) Atoms: An atom is a particle of matter that uniquely defines a chemical element. (a) What do you understand by following terms? (vi) Au = Gold (b) Name the non-metals with following symbols: (a)Name the metals with following symbols: (b) Write the symbol of following non-metals They may be Solid, Liquid or Gases at the Room Temperature.They are generally bad conductors of Heat and Electricity.(a)State four important properties of non-metals.Īnswer: Four important properties of non-metals (b) Write the symbol of following metals: They are good conductors of heat electricity.(a) State four important properties of metals.Īnswer: Four important properties of metals. 1. The constituents of a compound :Īns: (c) can be separated by chemical means 2. The smallest independent unit of matter is :Īns: (c) atom 3. An element is made up of :Īns: (c) one kind of atoms 4. The symbol for one molecule of nitrogen is :Īns: (a) N 5. The formula of aluminum sulphate is :Ĭhemistry Solutions Chapter-2 unit-1 Question 1. Non-metals are generally bad conductor of electricity.2N2 represents four molecules of nitrogen.H2SO4 represents one molecule of sulphuric acid.All normal elements give harmful radiation.Noble gases react with each other to form compounds.Write ‘True’ or ‘False’ for the following statements : A non-metal which conducts heat and electricity.ĭ. A metal which is liquid at room temperature.ĥ. An acid containing nitrogen in its molecules.Ĥ. The smallest unit of matter which can exist independently.ģ. The elements which are generally good conductors of electricity.Ģ. Match the statement in Column A with those in Column B: Column Aġ. metals, non-metals and gases.Ĭorrect Statement: Elements can be divided into three classes i.e. 1. Noble gases can react chemically with each other.Ĭorrect Statement: Noble gases cannot react chemically with each other.Ģ. Non- metals are generally solids and good conductors of electricity.Ĭorrect Statement: Metals are generally solids and good conductors of electricity.ģ. The smallest unit of matter which may or may not have independent existence is called molecules.Ĭorrect Statement: The smallest unit of matter which always exists independently is called molecules.Ĥ. The molecules of a compound may contain atoms of different elements combined together in different ratio.Ĭorrect Statement: The molecules of a compound may contain atoms of different elements combined together in definite ratio.ĥ. Elements can be divided into three classes i.e.
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