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CHEMISTRY DEPARTMENT WAID ACADEMY

CHEMISTRY DEPARTMENT WAID ACADEMY. Unit 1 Susbstances. 12. Approximately how many elements are there?. About 50 About 80 About 100 About 125. 15. What is the symbol for the element sodium?. S Si Se Na. 15. What is the name of the element which has the symbol Ca?. Carbon Calcium

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CHEMISTRY DEPARTMENT WAID ACADEMY

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  1. CHEMISTRY DEPARTMENT WAID ACADEMY Unit 1 Susbstances

  2. 12 Approximately how many elements are there? • About 50 • About 80 • About 100 • About 125

  3. 15 What is the symbol for the element sodium? • S • Si • Se • Na

  4. 15 What is the name of the element which has the symbol Ca? • Carbon • Calcium • Copper • Caesium

  5. 12 Which of the elements shown is a liquid at room temperature? • Silicon • Oxygen • Magnesium • Bromine

  6. 15 Which line shows three substances, all of which are gases at room temperature? • Hydrogen, oxygen and helium. • Hydrogen, oxygen, and bromine. • Mercury, oxygen and sulphur. • Oxygen, nitrogen and bromine.

  7. 20 Which of the elements shown is a non-metal? • Potassium. • Cobalt. • Chromium. • Phosphorus.

  8. 20 Which line shows three elements which have been known for a very long time? • uranium, americium and radium. • gold, silver and plutonium. • copper, silver and gold. • americium, gold and lead.

  9. 12 Which line shows three elements which all belong to the Noble Gas group of elements? • lithium, sodium and potassium • fluorine, chlorine and bromine • hydrogen, oxygen and nitrogen • helium, neon and argon

  10. 12 Which compound contains three elements, one of which is oxygen? • sodium oxide • sodium carbonate • sodium nitride • sodium hydride

  11. 12 A gas relights a glowing splint.Which gas is this? • Oxygen • Hydrogen • Nitrogen • Carbon dioxide

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