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Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. What is an element?

    • A substance made of different atoms joined together
    • Different substances mixed together
    • A substance made of only one type of atom
    • Any substance that is a solid

  2. Which of these is one of the ideas in Dalton’s model?

    • All the atoms of one element are identical
    • Atoms can be seen with a magnifying glass
    • The atoms of one element come in many sizes
    • Only metals are made of atoms

  3. What is the chemical symbol for copper?

    • CU
    • Cu
    • Co
    • C

  4. Which element has the symbol Na?

    • Potassium
    • Magnesium
    • Sodium
    • Nitrogen

  5. Sodium is a soft metal. Chlorine is a poisonous gas. What is the compound sodium chloride like?

    • A grey powder that a magnet picks up
    • A soft metal
    • White crystals that are used as table salt
    • A poisonous green gas

  6. Iron and sulfur are heated together until they react. Why can a magnet not pull the iron out afterwards?

    • The magnet only works on cold iron
    • The heat has used up all the iron atoms
    • The sulfur has melted over the iron
    • The iron atoms are now joined to sulfur atoms in a compound

  7. How many atoms are there in one molecule of water, H2O?

    • 4
    • 2
    • 3
    • 1

  8. Which elements are in calcium carbonate, CaCO3?

    • Carbon and oxygen only
    • Calcium, copper and oxygen
    • Calcium and cobalt
    • Calcium, carbon and oxygen

  9. What is the name of the compound MgO?

    • Magnesium dioxide
    • Magnesium oxygen
    • Magnesium oxide
    • Manganese oxide

  10. What does this particle diagram show?

    • A mixture of two elements
    • An element on its own
    • A compound on its own
    • A mixture of an element and a compound
Answers
  1. A substance made of only one type of atom. Gold is an element. Every atom in it is a gold atom.
  2. All the atoms of one element are identical. Dalton said the atoms of one element are all the same, and different from the atoms of every other element.
  3. Cu. Cu comes from cuprum, the Latin name for copper. The second letter is always small.
  4. Sodium. Na comes from natrium, the Latin name for sodium. Nitrogen is N.
  5. White crystals that are used as table salt. A compound has different properties from the elements in it. Sodium chloride is table salt.
  6. The iron atoms are now joined to sulfur atoms in a compound. The compound, iron sulfide, has its own properties. It is not magnetic.
  7. 3. Two hydrogen atoms and one oxygen atom make three.
  8. Calcium, carbon and oxygen. Ca is calcium, C is carbon and O is oxygen. Each capital letter starts a new symbol.
  9. Magnesium oxide. Mg is magnesium. When oxygen joins a metal, its name changes to oxide.
  10. A mixture of an element and a compound. There are two kinds of particle, so it is a mixture. The pairs of matching atoms are an element. The pairs of different atoms are a compound.