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
properties of acids
sour taste, corrosive, dissolves in water
properties of alkaline
bitter taste, corrosive, dissolves in water
examples of acids
hydrochloric acid, nitric acid, sulfuric acid, ethanoic acid
examples of alkaline
sodium hydroxide, potassium hydroxide, calcium hydroxide
