Online Quiz: British Curriculum Primary 5 Science Quiz: Reversible and Irreversible Changes

A rusting iron B melting chocolate and letting it set again C baking a cake D burning wood

A melting wax B freezing water C burning paper D evaporating water

A A new animal is made B The material becomes heavier only C The material disappears forever D The material can be changed back by a physical process

A a new substance is formed B the object moves position C the material is measured D the colour is liked

A moving a magnet near iron B gas bubbles from a reaction C cutting paper into pieces only D pouring water into a cup

A burning salt B cooking salt into bread C dissolving salt in water then evaporating the water D turning salt into smoke

A melting ice B freezing juice C condensing steam D frying an egg

A stretching a rubber band within its limit B rusting a nail C burning petrol D baking dough

A The nail melts B A new substance, rust, forms C The iron becomes water D Iron only changes position

A baking bread - reversible by freezing B rusting - reversible by cooling C melting wax - reversible D burning candle wick - reversible

A Irreversible because it burns B It forms metal C It makes a new gas D Mostly reversible in shape? No, but no new substance forms

A vinegar reacting with bicarbonate of soda B glass breaking C ice melting D water evaporating

A Ask if the material is useful B Try to recover the original material safely C Guess from colour only D Measure the table

A burned toast becoming bread B rust becoming iron by cooling C melted butter becoming solid again D cooked rice becoming raw grains

A rust becoming iron B ash becoming wood C fried egg becoming raw egg D ice becoming water

A temperature changes without external heating B shape changes after cutting C sand is poured D water changes container

A The water burns B Sand can be separated by filtering or settling C A new substance forms D Sand dissolves permanently

A It remains unchanged forever B It is just evaporation C It sets to form a hard new material D It turns into ice

A Every change is reversible B Only colour changes are reversible C No change is reversible D Some physical changes are reversible, but not all changes are easy to reverse

A Reversible changes recover original materials; irreversible changes often make new substances B Reversible changes always burn C All dissolving is irreversible D Irreversible changes always freeze