Comprehensive Study Library: Click any card to reveal scientific facts.
Reactant
A starting substance in a chemical reaction.
Product
A new substance formed during a chemical reaction.
Physical Property
Features like color, state, or melting point. No new substance is formed.
Chemical Property
Features like pH or how it reacts with acids/water/oxygen.
Compound
Two or more elements chemically bonded together (e.g., Iron Sulfide).
Element
A pure substance made of only one type of atom (e.g., Magnesium).
Oxide
A compound formed when an element reacts with oxygen.
Malleable
A physical property of metals: can be hammered into shapes.
Sulfide
A compound formed when a metal reacts with sulfur.
Decay
A natural chemical reaction happening in plants as they rot.
Toxic
Hazard: A substance that can poison you. (Skull and Crossbones symbol).
Corrosive
Hazard: A substance that can dissolve skin or metal.
Physical vs Chemical Reveal (12 Examples)
1. Burning Wood
CHEMICAL - Heat creates new ash and smoke.
2. Sugar in Tea
PHYSICAL - Dissolving is a mixture, not a new substance.
3. Rusting Nail
CHEMICAL - Iron reacts with Oxygen to form Iron Oxide.
4. Chopping Veg
PHYSICAL - Shape changes, but molecules stay the same.
5. Baking Cake
CHEMICAL - Ingredients bond through heat.
6. Breaking Glass
PHYSICAL - Still glass, just in pieces.
7. Vinegar + Soda
CHEMICAL - React to produce CO2 gas bubbles.
8. Sour Milk
CHEMICAL - Bacteria produce new chemicals.
9. Melting Ice
PHYSICAL - State change: Solid to Liquid.
10. Digesting Food
CHEMICAL - Broken down by enzymes into energy.
11. Cutting Fruit
PHYSICAL - Only shape changes.
12. Rotting Banana
CHEMICAL - Decay changes the molecular structure.