Changes and Reactions
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name the 2 types of changes
physical and chemical
what is physical change
the one that occurs when the nature or characteristic properties of matter are not affected
name different categories of physical changes
change of state, dissolution and deformation
change of state explication
are usually reversible, when a phase change occurs the properties of the substance are not actually changing
dissolution explication
act of making a solution by adding a solute to a solvent
what are some cases where dissolution is not reversible
depends on the solute, some substances rerelease energy when they are dissolved and some absorb energy in order to dissolve
example of dissolution
sugar dissolves in water, the sugar molecules break apart until they are evenly distributed
deformation explication
act of changing the physical appearance of an object, the objects is permanently deformed but the nature and properties of the objects do not change
examples of deformation
ripping paper, breaking plate etc
what is chemical change
occurs in which the nature and properties of the substance are changed, it must occur to result in a chemical change, the bonds between atoms in the reactants are rearranged to produce new substances
name clues to indicate that a chemical change is occurring
-emission of light -temperature change (NOT with intention) -gas production( smoke or bubbles) -color change (NOT if your intention is to dye something) -formation of precipitate (solid) -production of odor
what is reactant
everything on the left side of arrow, they are substances that come together and react during chemical reaction.
what is product
everything on right side of arrow, substance that are produces after a chemical reaction
what is coefficient go in notes for visuals
the larger number present in front of a substance, no coefficient=1 corresponds with how many times you have the same atom or molecule.
what is subscript
the smaller umber after element, the number cannot be changed only meant for the element directly in front of it no subscript=1
name types of chemical reactions
synthesis, photosynthesis, decomposition, oxidation and combustion (i think)
synthesis explication (check notes for image)
when smaller and simpler reactants are combined to build a more complex product.
type of synthesis
synthesis of water and photosynthesis
decomposition explication
opposite of synthesis, breaking down complex molecule into simpler substances
types of decomposition
decomposition of water and cellular respiration
oxidation explication
when oxygen gas is always a reactant, often involved in corrosion reactions can be a synthesis or decomposition reaction
type of oxidation
fromation of rust, combustion
combustion explication
type of oxidation reaction, releases high amount of energy and results of a fire-explosion. always have a substance reaction with O2 to produce CO2 and H2O