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Mapa Mental por Kingfisher, actualizado hace más de 1 año
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Creado por Kingfisher
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Unit 1.1 - Chemical
Reactions
- Change
- Physical
- No new substances
are formed.
Examples boiling,
melting, freezing,
condensing,
dissolving
- No new substances
are formed.
Examples boiling,
melting, freezing,
condensing,
dissolving
- Chemical
- Atoms are arranged to
form new substances.
Examples: permanent
colour change, the
production of a new solid,
liquid or gas, or when
energy is produced or
absorbed energy is
produced or absorbed
- A permanent change in
colour—toast turning
brown and leaves
changing their colour in
autumn are signs that a
chemical reaction has
taken place.
- A new solid
(precipitate) forms
- Energy being absorbed
or produced—this change
will be accompanied by a
drop in temperature or the
release of heat and light.
- Atoms are arranged to
form new substances.
Examples: permanent
colour change, the
production of a new solid,
liquid or gas, or when
energy is produced or
absorbed energy is
produced or absorbed
- Physical
- Symbols & Formulae
- Element Symbols
- Basic building blocks.
118 basic types of
atom: 92 naturally
occurring & 26 are not
- Basic building blocks.
118 basic types of
atom: 92 naturally
occurring & 26 are not
- Chemical Formulae
- Molecules
- What type & how many
atoms. Eg H2O, C6H12O6
- What type & how many
atoms. Eg H2O, C6H12O6
- Lattices
- What type & proportion
of atoms. Eg NaCl
- Covalent Bonding: Only occur
between non-metal atoms
- Ionic bonding almost always involves
metals combined with non-metals
- What type & proportion
of atoms. Eg NaCl
- Molecules
- Element Symbols
- Chemical
Equations
- Can be written as a
word equation or a
formula equation
- Substances present at the start are
reactants and the new substances
formed are known as the products
- Can be written as a
word equation or a
formula equation
- Balanced chemical
equations
- How many reactant
molecules needed and
how many product
molecules are produced
- The Conservation of Mass =
Atoms cannot appear from
nowhere nor disappear into thin air.
- The Conservation of Mass =
Atoms cannot appear from
nowhere nor disappear into thin air.
- State of reactants and products
- How many reactant
molecules needed and
how many product
molecules are produced
- Controlling
Reaction Rates
- Changing the Temperature:
Faster - Increase temperature
- Concentration: The
concentration of reactants or
products determines the rate
of reaction. Faster - Increase
reactants or decrease
products
- Changing surface area: Faster -
More reactant surface area,
more molecules react
- Catalysts: Help the reactant
molecules to form the products,
but are not changed or used up
in the reaction. Eg UV used to
harden dental fillings
- Enzymes: Special types of
catalysts, like a pair of scissors.
Do not combine with other
atoms or molecules; Eg
Digestive Enzymes
- Changing the Temperature:
Faster - Increase temperature
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