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6. A chemical symbol that represents a reversible reaction ?

  • ⇌
  • ←
  • →

7. Symbol for relative formula mass

  • Mr
  • RFM

8. In terms of electrons what do group 7 elements have in common ?

  • 20 electrons
  • 10-7=3 3 electrons in the outer shell
  • 7 electrons in the outer shell
  • 7 electrons in the neutron

9. State the effect of increasing the temperature on the rate of reaction

  • Increases
  • Decreases

10. atomic number ?

  • The number of protons in an atom(number of electrons is the same in a neutral atom )
  • The number of protons in an atom

11. What foluma relates to moles ,mass and Mr

  • Moles=mass/Mr
  • Moles=mass/RFM

12. Name KOH

  • Potassium hydroxide
  • kodium hydroxide

13. How are the subatomic particles arranged in an atom

  • Protons and neutron in the nucleus,electrons orbiting in shells
  • Nucleus and neutron in the nucleus,electrons orbiting in shells
  • Neutrons and neutron in the nucleus,electrons orbiting in shells
  • Electrons and neutron in the nucleus,electrons orbiting in shells

14. What is more reactive ,lithium or sodium?

  • Sodium
  • Lithium

15. What are the groups in the periodic table ?

  • The columns ,numbered 1,2,3,4,5,6,7,10
  • The columns ,numbered 1,2,3,4,5,6,7,0
  • The columns ,numbered 1,2,9,4,5,6,7,0
  • The columns ,numbered 1,2,3,4,5,6,7,8

16. What is the rate of a chemical reaction in terms of products ?

  • How quickly the products in the reaction are formed
  • How quickly the products are formed

17. Complete the sentence :In covalent bonds ,electrons are ________

  • Shared
  • shown

18. Define mixture

  • A substance
  • A substance made of more than one thing not chemically bonded together with heat
  • A substance made of more than one thing not chemically bonded together
  • A substance made of more than one thing chemically bonded together

19. metal oxide +acid

  • salt+water
  • salt+oxygen

20. Define molecule

  • A substance made of more than one atom chemically bonded together (can be atoms of the same type )
  • A substance made of more than one substance chemically bonded together (can be atoms of the same type )
  • A oil made of more than one atom chemically bonded together (can be atoms of the same type )
  • Element just different density