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Chemical Reactions
Term | Definition |
---|---|
Physical Change | Its any change that alters the form or appearance of a substance but does not change it into another substance. |
Chemical Change | A change in matter that produces new substances, the atoms rearrange to form new substances. |
Reactants | Substances that undergo a chemical change. Examples are burning and rusting. |
Products | The new substances that form from a chemical change are called products. |
Precipitate | This is a solid that forms from liquids during a chemical reaction. Milk + lemon juice = curdled milk |
Exothermic Reaction | The energy released as the products form is greater than the energy required to break the bonds of the reactants. The energy is released as heat and light. |
Endothermic Reaction | More energy is required to break the bonds of the reactants than is released by the formation of the products. The energy can be absorbed by nearby matter. |
Chemical Equation | This is a way to show a chemical reaction using symbols instead of words. |
Law Of Conservation of Mass | States that during a chemical reaction matter is not created or destroyed. |
Closed System | Matter does not enter or leave. A chemical reaction occurs inside a sealed airtight container. Does not allow any mass to enter or escape. |
Open System | Matter can enter from or escape to the surroundings. EX. Fisn Bowl |