1) What CAN'T we see with our eyes? a) water b) a copper atom c) a desk d) a lump of silicon 2) Hydrogen atoms are found in which substances? (1 min 40 sec) a) glass and water b) wood and glass c) wood and water 3) An element is a substance made of _____ kind of atom? a) ONE b) TWO c) THREE d) MANY 4) Which substance on the desk was an element? a) wood b) glass c) water d) copper 5) If we pulled the Universe apart into atoms and put them in separate piles of the same kind, how many piles would we have? a) 0 b) 1 c) 92 d) trillions of trillions 6) Atoms are coloured. a) True b) False

4th Video A

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