Unit 1: Chemcial Reactions - Characteristics
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What are the characteristics to describe a Physical Change?
• No new substance forms • Changes are reversible or temporary • There is no change in mass (weight) • A small amount of heat / energy is required
What are the characteristics to describe a Chemical Change?
• A new substance is formed • Changes are irreversible or permanent • There is a change in mass (weight) • Energy / heat is taken in or given out
What happens to Iodine when heated?
Iodine, when heated, changes to a purple vapour, however changes back, when cooled, to shiny black crystals (Physical change)
What happens to Zinc Oxide when heated?
Zinc Oxide, when heated, changes from a white solid to a yellow solid, but changes back to a white solid when cooled (Physical change)
Describe the colour changes when Copper Sulfate is heated
When blue Copper Sulfate is heated, a new white substance is produced and steam is given off (Chemical change)
Describe the colour changes when Copper Carbonate is heated
When green Copper Carbonate is heated, a new black solid is produced (Chemical change)
What happens when Magnesium is heated?
When grey Magnesium is heated, a new white solid (ash) is formed (Chemical change)