chemistry

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Across
  1. 4. of conservation of mass/ in a chemical reaction, the mass of the products always equals the mass of reactants
  2. 7. phosphate/ Ca (PO )
  3. 9. elements with properties intermediate between the properties of metals and non-metals
  4. 11. /OH
  5. 12. ion/ a group of atoms, usually of different elements, that act as a single ion
  6. 14. that has a pH level less than 7
  7. 15. element/ an element that can form an ion in more than one way
  8. 19. bond/ a connection between the atoms of non-metals, in which two atoms share a pair of electrons
  9. 20. member of the family of elements composed of very reactive, coloured non-metals
Down
  1. 1. substance that cannot be broken down into any simpler substance by chemical means
  2. 2. compound /when atoms of two or more different non-metals combine, a pure substance known as a ..... is formed
  3. 3. ability to stretch without breaking
  4. 5. suspension of small, solid particles formed during a chemical reaction
  5. 6. substance that has a pH level more that 7
  6. 8. reaction /a process by which chemical change happens
  7. 10. / SO
  8. 13. Sulphate / Al (SO )
  9. 16. indicator/ a mixture of chemicals that changes colour through a wide range of pH values
  10. 17. NH
  11. 18. atom or group of atoms with a negative charge or a positive charge