Energetics Flashcards
(22 cards)
What reaction takes in heat and temperature goes down (energy is taken in from surroundings to reaction [products have more energy than reactants])
Endothermic
What reaction gives out heat and temperature goes up (energy released from reaction to surroundings [products have less energy than reactants])
Exothermic
A reaction between an acid and an alkali is called?
Neutralisation
An acid and a carbonate make?
CO2
In a … Reaction energy is released from the reaction to surroundings (the products therefore have less energy than reactants)
Exothermic
In a … Reaction energy is taken in from surroundings to the reaction (products therefore have more energy than reactants)
Endothermic
Combustion and neutralisation are?
Exothermic
… reactions have high energy in the reactants and low energy in the products
Exothermic
The symbols used for energy (enthalpy) and temperature change in a reaction are?
triangle D, and triangle T
… reactions have low energy in the reactants and high energy in the products
Endothermic
(S) - solid
(L) - liquid
(G) - gas
(Aq) - aqueous
Acids are an aqueous substance
Energy is needed to … Chemical bond
Break
Energy is given out when bonds are?
Made
Define bond energies
The energy needed to break a chemical bond
Bonds - Bonds
Broken Made
1370 - 1856
-486 KJ/mole (KJmol-1) = exothermic
Energy change =
Bonds broken - bonds made
X/y axis of an exo/endothermic reaction
Cause of reaction
Energy
Energy values have the units of
KJ/mole (KJmol-1)
Complete some exercises and questions on bond making, breaking and energy change calculations
Workbook
It takes … Kilo joules of energy to raise one … Of water by … Kelvin. One Kelvin is equal to … Degrees celsius.
One
Gram
One
One
Negative value =
Positive value =
Exothermic
Endothermic
Q = m x c x triangleT
Energy released= mass of water x specific heat capacity of water x change in temperature
(-ve = exothermic and vice versa)
