3.
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In chemical equations the atoms of each element are represented by what? |
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Numbers |
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Colours |
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Shapes |
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Symbols |
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4.
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Elements are listed on the periodic table and can be classified as metals and non-metals. Where are they found on the periodic table? |
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Metals on the right, non-metals on the left |
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Metals on the left, non-metals on the right |
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They are not arranged in any particular order |
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The non-metals are at the centre with metals around the outside |
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5.
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Which of the following is the correct definition of a compound? |
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A substance containing atoms of one element |
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A substance containing atoms of two elements |
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A substance containing atoms of two elements chemically bonded |
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A substance containing atoms of two or more elements chemically bonded |
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6.
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Which of the following lists contains only metallic elements? |
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Al, CO, Fe, Mg, Au |
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Na, Li, I, Zn, Fe |
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Fe, Al, Na, Mg, Zn |
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Cu, Pt, Fe, Ag, Br |
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7.
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Which of the following is a compound containing non-metals only? |
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Sodium carbonate |
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Methane |
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Calcium chloride |
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Iron fluoride |
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8.
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When atoms join together to form molecules what happens to their electrons? |
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A pair of electrons is transferred from one atom to the other |
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The atoms lose at least one pair of electrons |
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The atoms gain at least one pair of electrons |
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The atoms share at least one pair of electrons |
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9.
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Elements normally exist as atoms but they can form charged particles called ions. How do they do this? |
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It happens when the atoms are rubbed on a piece of fabric |
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They lose or gain at least one electron |
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It can only happen to them in a Van-der-Graaf machine |
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They are only formed in space where there are cosmic rays |
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10.
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Which of the following lists contains the missing words from the following passage in the right order?
There are over a __________ different types of atom, called __________. The atoms of a particular element are ___________ to each other. They cannot be changed ____________ into any different element. _________ are substances that contain atoms of at least two elements chemically combined. |
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hundred, elements, identical, chemically, compounds |
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lot, hundred, compounds, elements, joined |
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hundred, compounds, identical, chemically, elements |
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elements, hundred, compound, same, joined, ions |
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