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eraser
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rocket
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gift
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baam
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15
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_____ reaction happens when energy is absorbed from the surroundings and the temperature of the surroundings decreases
Endothermic
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What is the reaction in which an acid reacts with a base or alkali to form a salt and water called?
neutralisation
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The breaking down of a compound by passing an electric current through it is called ________.
electrolysis
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The reactivity of group I elements ______ down the group.
increases
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What gas is given off when group I elements react with water?
hydrogen gas
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seesaw
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star
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fairy
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banana
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____________ reaction happens when energy is released to the surroundings and the temperature of the surroundings increases.
Exothermic
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baam
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fairy
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rocket
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baam
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When a group 1 element reacts with water, a hydroxide is formed. What colour could Universal Indicator turn in this solution?
blue or purple (alkaline)
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What is the transition metal used as a catalyst(to convert carbon monoxide to carbon dioxide) in the car exhaust?
platinum
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Halogens exist as ___________ molecules. It means that each molecule contains 2 atoms.
diatomic
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ÎH is negative for what type of reactions?
exothermic reactions
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What happens to the density of group 1 metals as you go down the group?
increases
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As you go down group 7, from fluorine to astatine, what happens to the reactivity of the elements?
reactivity decreases
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thief
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