chemical changes Flashcards
definitions
define what is a physical change
no new substance is formed, reversible, change is temporary, no chemical change is involved ONLY the change of state in matter
define what is a chemical change
New substance is made.
Difficult to reverse, change is permanent.
Process: chemical reaction. New substances = products.
Interactions with matter + energy takes place in:
Heat
Light
Oxygen
Electricity
Mixing of substances.
Changes involving heat:
Expansion + contraction
Changes of states
Combination
Thermal Decomposition
Combustion
Oxidation
what is combination
A chemical change involving heat in which 2 or more reactants are combined together to form one product.
what is Thermal Decomposition/Decay
A chemical change involving heat in which one reactant is broken down into simpler substances to form 2 or more products
what is combustion
A chemical change involving heat in which 1 reactant is BURNT in Oxygen.
Heat and light are usually given off.
what is oxidation
A chemical change when it REACTS with Oxygen.
what is photodecomposition
a chemical change in which Light can be used to break down certain compounds.
what are some Chemical changes involving LIGHT.
photosynthesis
photodecomposition
what is a chemical change involving electricity
electrolysis
what involves electrolysis
electroplating
what are some chemical changes involving mixing
dissolving
which part of the ph scale is acidic
1-6
which part of the ph scale is alkaline
8-14
