writing chemical equation
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_______ change involves a change in the phases of matter, whereas_________change involves a change in chemical bonds ,a change in the chemical composition of matter.
A physical , a chemical
When writing chemical equations, there are two main areas of interest :
Reactant product
Reactant
a substance that changes in a chemical reaction starting materials and are written on the left-hand side of the equation
Product
the end result of the reaction and are written on the right-hand side of the equation
The “+” sign indicates that there are __________________
used to separate multiple reactants or products
• The “→” symbol is the reaction arrow and indicates the
yield sign; separates reactants from products
reactant or product in the solid state
(s)
reactant or product in the liquid state
(l)
reactant or product in the gas state
(g)
reactant or product in an aqueous solution (dissolved in water)
(aq)
the _________ used to balance the given chemical reaction
coefficient
If there are no visible coefficients in front of a compound, then it is understood that a _____is in front.
1
A coefficient is :
is a number placed in front of a chemical symbol or formula
represent the number of atoms, ions, or molecules involved in the reaction or it can represent the number of moles of these substances involved in the reaction
coaffecient
the product in complete Combustion
CO2+H2O
the product in incomplete Combustion
CO+H2O or C +H2O