Science North
Is it a Chemical ReactionGrade 5, Understanding Matter and EnergyHandout - Answer SheetWhat indicates a physical reaction?During a physical change, the substance has changed, such as chane in state of matter, but it has not become a new substance. What indicates a chemical reaction?During a chemical change, a new substance if formed.. Signs of a chemical change (that a new substance was formed) include:Formation of a gas - bubblesChange in colourChange in pHChange in temperature - either increase or decreaseFormation of new solid or liquidAppearance of lightFrom the list below, identify whether it is a physical or a chemical change.Activating a cold packChemicalBurning a log in a camp fireChemicalEvaporating alcoholPhysicalActivating a hot packChemicalIce meltingPhysicalDissolving sugar in waterPhysicalA rust spot on a carChemicalDropping a Mentos candy into a coke bottlePhysicalMixing baking soda and vinegarChemical ................
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