Hebden Unit VI - Chemical Reactions Flashcards
What is a SUBSCRIPT?
It is the small number below the Element
eg. CL2
What is the Law of Conservation of Mass?
The total mass in a closed system does not change during a chemical reaction.
What is a REACTANT?
A chemical which is present at the start of a chemical reaction.
What is a PRODUCT?
A chemical which is formed as a result of a chemical reaction.
What is a COEFFICIENT?
The number shown in front of each species involved in a chemical reaction
eg. 2NaCl
What is SYNTHESIS?
A reaction that involves the combination of two or more substances to form (synthesize) a compound.
eg. A + B -> AB
What is DECOMPOSITION?
A reaction that involves breaking down a molecule into simpler substances.
eg. AB -> A + B
What is SINGLE REPLACEMENT?
A reaction that involves replacing one atom in a compound by another atom.
eg. A + BX -> B + AX
What is DOUBLE REPLACEMENT?
A reaction which involves an exchange of atoms or groups between two different compounds.
eg. AB + XY -> AY + XB
What is NEUTRALIZATION?
A reaction between H in an acid and OH in a base to make H2O
eg. HCl + NaOH -> NaCl + H2O
What is an EXOTHERMIC REACTION?
A reaction which gives off heat to its surroundings.
What is an ENDOTHERMIC REACTION?
A reaction which absorbs heat from its surroundings.
What is CHANGE IN ENTHALPHY?
Enthalpy is the heat contained in a system.
What is a SOLUTION?
A homogeneous mixture of two or more substances.
What is a PRECIPITATE?
A solid formed when two or more liquids or aqueous solutions react.
