chemistry

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Across
  1. 5. , symbol of iron
  2. 6. , heavier solids settle down at the bottom when mixture is left undisturbed for a while .
  3. 9. , fibres made from from chemical polymers in a laboratory
  4. 11. , a molecule of water can be broken down into hydrogen and oxygen by the process of electrolysis
  5. 13. , atomic number of oxygen
  6. 14. , atomic number of calcium
  7. 17. - also called semi-metals
  8. 18. , The number of protons in the nucleus of an atom
  9. 21. , exists as liquid
  10. 22. , atomic no of sulphur
  11. 25. , water in rivers and oceans provides a surface for ________ and shipping
  12. 27. , they include harmful and toxic chemicals , suspended wastes and heavy metals .these make the soil unfit to grow crops and are very harmful to animals .
  13. 29. , core of the pencil is made up of a non toxic mineral called _____ .
  14. 33. , carbon,oxygen
  15. 34. ,___ which has chemicals like magnesium , silicon and oxygen
  16. 35. , atomic number of sodium
  17. 36. , symbol of magnesium
  18. 37. , contains penicillin and tetracylin
  19. 38. , latin name of iron
Down
  1. 1. , the iron pillar of Qutub Minar is ______ and has not corroded because it is alloy made up of high quality of iron .
  2. 2. , molecules of compound can be broken down into their elements by a ___________________ only
  3. 3. , exists as solid
  4. 4. , _____ is a branch of science that deals with the study of composition properties and structure of substances .
  5. 6. , Mendeleev listed the ______ known elements and their properties on cards
  6. 7. - helium,neon,argon,krypton,redon,xenon
  7. 8. - full form of PET
  8. 10. , when is world water day celebrated ?
  9. 12. , latin name of potassium
  10. 15. , expansion of matter
  11. 16. , __ litre of water is used to produce one sheet of paper
  12. 19. , solids cannot be ______ because their molecules are closely packed and have negligible intermolecular spaces
  13. 20. , smallest unit of matter
  14. 23. , first synthetic fibre
  15. 24. , sodium,chloride
  16. 25. , atomic number of neon
  17. 26. , a solution is formed when a solute is _______ in water
  18. 28. , used to cutdown friction
  19. 30. , ___ is a complex substance made up of pigments, resins , dyes and other particulate material
  20. 31. , symbol of plumbum
  21. 32. , he is the symbol of ____