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Froggy Jumps

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Chemistry reaction quiz

Ana Belén Jiménez

Spain

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Froggy Jumps Reaction RadarVersion en ligne Chemistry reaction quiz par Ana Belén Jiménez 1 What happens during a chemical reaction? a Things just melt or freeze b Substances change into brand new ones c The substances stay exactly the same 2 Left side of the arrow in 2H2(g) + 1O2(g) -> 2H2O(l): What are these starting substances called? a Products b Results c Reactants 3 Right side of the arrow in 2H2(g) + 1O2(g) -> 2H2O(l): What is the new substance formed? a The reactant b The product c The ingredient 4 What do the big numbers in front (like the 2 in 2H2) tell us? a How hot the liquid is b How many molecules of that substance are used c How fast the frog jumps 5 A glowstick starts to shine after you crack it. Why is this a sign of a reaction? a It is making bubbles b It is turning into a solid c It is giving off light 6 Two clear liquids mix and a solid powder appears at the bottom. This is called: a A precipitate b Boiling c Melting 7 Bubbles form in a liquid but it isn't boiling. What is being created? a A gas b Nothing new c A solid 8 Touch a beaker and it feels very cold. What happened? a The colour changed b A gas was made c The temperature changed 9 An iron nail turns from silver to orange-brown. This is a sign of: a A colour change b A loud noise c A flash of light