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Understanding chemical reactions - Coggle Diagram
Understanding chemical reactions
changes in matter
pysical changes
does not produce any new substance
chemical changes
produces new substances
a chemical reaction is a process in which atoms of one or more substances rearange to form one or more new substances
signs of chemical reactions
change in properties
formation of bubbles
change in oder
change in color
formation of precipate
change in energy
warming or cooling
release of light
what happens in a chemical reaction
atoms rearange and form new substances
substace are fixed arranged atoms
atoms of different elements and compounds make different substances
two types of subtances elements and compounds
bonds break and bonds form
atoms rearange when chemical bonds between atoms break
constantly moving particles make up all substances
particles collide with eachother
chemical equaitons
chemical formulas
ex: fe(iron)+ O(oxogen) = feO2(rust)
writing chemical eqautions
starting substances in a chemical reaction are reactents
substances produced by these reactions are products
element symbols
ex: carbon=c potassium=k
a chemical eqatuon is a descritpon using elemenst symbols and formulas
conservation of mass
in any closed system, mass is neither created nor destroyed by chemical reactions or physical transformations
a equation is balanced from both sides of an arrow
atoms are conserved
when the bonds break the atoms dont
when the atoms are conserved so is the mass
balancling chemcial equations
a coeiffcent is a number placed in front of and element symbol or chemical formula in a equation