Chapter 8
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FlashcardsReactants
A chemical substance entering into a reaction
Law of conservation of mass
No change is observed in the toal mass of substances involved in a chemical reaction; that is the mass of the products equals the mass of the reactants.
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13 Terms
Reactants
A chemical substance entering into a reaction
Law of conservation of mass
No change is observed in the toal mass of substances involved in a chemical reaction; that is the mass of the products equals the mass of the reactants.
Avogadro’s number
6.022 ×1023
Driving Forces
Formation of a solid, Formation of a gas, Formation of water, Transfer of electrons
Combustion Reaction
A reaction in which a substance reacts with oxygen to form oxides.
Combination/ Synthesis
Two reactants combine to give one product.
A +B → AB
Decomposition Reactions
A single substnace is decomposed or broken down to give two or more different substances.
AB → A + B
Single Displacement Reactions
One element reacts with a compounds to replace one of the elements of the compound, yielding a different element and a different compound.
A + BC → B + AC or A + BC → C + BA
Exothermic reactions
A chemical reaction in which heat is released as a product
H2 (g) + Cl2 (g) → 2 HCl (g) + 185 kJ
Endothermic Reactions
A chemical reactios that absorbs heat.
6 CO2(g) + 6 H2O (l) + 2519 kJ → C6H12O6 + 6 O2 (g)
Photosynthesis
To store the energy from the sun in the plant.
Activation Energy
The amount of energy needed to start a chemical reactions