Chemical Energetics
False
During an endothermic reaction, the temperature rises. True/False
False
Exothermic reactions are always fast. True / False
False
Exothermic reactions only involve bond making. True/ False
Rise
An exothermic reaction is indicated by a RISE or a FALL in temperature
True
Condensation is exothermic. True/ False
True
During neutralization heat is lost to the surroundings. True/False
False
Endothermic reactions are always slow. True / False
False
Freezing is an endothermic process. True/False
Positive
In an endothermic process, is the enthalpy change (ΔH) positive or negative
Greater
In an endothermic reaction, is the enthalpy of the products greater or lower than the reactants
False
In an endothermic reaction, there are always more bonds broken than formed. True or False?
energy absorbed during bond breaking
In an endothermic reaction, which is greater - energy absorbed during bond breaking OR energy released during bond forming
False
In an exothermic process, heat enters the system. True/False
Negative
In an exothermic process, is the enthalpy change (ΔH) positive or negative
False
In an exothermic reaction, there are always more bonds formed than broken. True or False
Endothermic
In which type of process (exothermic OR endothermic), does heat enter the system
Exothermic
In which type of reaction (exothermic OR endothermic), is the enthalpy of the products lower than the reactants
Endothermic
Is bond breaking exothermic or endothermic?
Endothermic
Is photosynthesis exothermic OR endothermic
Exothermic
Is respiration exothermic OR endothermic
exothermic; all combustion reactions are exothermic
Is the combustion of ethanol an exothermic or endothermic process
endothermic; the process is photosynthesis
Is the formation of a carbohydrate and oxygen from carbon dioxide and water an endothermic or exothermic process?
exothermic; the process is combustion
Is the oxidation of carbon to carbon dioxide an endothermic or exothermic process
positive
When ammonium chloride is dissolved in water, the temperature of the solution falls. Hence is ΔH for the process positive OR negative?
False
When bonds are formed, energy is absorbed from the surroundings. True/ False
positive
When ice melts, is the enthalpy change (ΔH) positive OR negative
positive
When iodine sublimes, is the enthalpy change positive or negative
Endothermic
When steam is passed through white hot coke, the temperature of the coke falls. Is the reaction exothermic OR endothermic
True
ΔH for combustion reactions are negative. True/False
