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Chemistry 11
Canvas Module 3 Test review definitions
22
Chemistry
11th Grade
12/12/2023

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Term
Percent Yield
Definition
The ratio of the actual yield to theoretical yield expressed as a percent.
Term
Actual Yield
Definition
The amount of product produced or collected.
Term
Theoretical Yield
Definition
The amount of product calculated from a 100% complete reaction of the limiting reagent.
Term
Excess reagent
Definition
A substance that has leftovers when the chemical reaction is complete. The amount of product formed is not limited by excess reagents.
Term
System
Definition
A part of the universe being studied.
Term
Closed system
Definition
A system where energy can enter and leave but matter cannot.
Term
Open system
Definition
A system where energy and matter can enter and leave.
Term
Surroundings
Definition
Everything else
Term
Isolated system
Definition
A system where neither energy nor matter can enter or leave.
Term
Purity
Definition
The (mass) percentage of a specific substance in a sample.
Term
Limiting reagent
Definition
The substance that is totally consumed when the chemical reaction is complete. The amount of product formed is limited by this reagent, since the reaction cannot continue without it.
Term
Green chemistry
Definition
Chemistry with a focus on efficiency to reduce waste and being environmentally friendly which means to consider and reduce any long-term effects on the environment.
Term
Oxidations
Definition
Occurs when oxygen reacts with a substance to form an oxide and release heat.
Term
Enthalpy
Definition

Total amount of heat energy contained in a system.

Change in enthalpy = ΔH

Term
Transition state
Definition
The chemical arrangement with the highest potential energy for a reaction.
Term
Exothermic
Definition

Chemical reaction that releases heat 

ΔH<0(negative) for exothermic reactions 

Term
Bond dissociation energy (BDE)
Definition
The amount of energy required to break a bond(also known as bond strength)
Term
Endothermic
Definition

Chemical reaction that absorbs heat.

ΔH>0(positive) for endothermic reactions.  

Term
Crude product
Definition
Raw, unpurified products collected from a reaction.
Term
Potential energy
Definition
The stored energy of an object due to its position or state.
Term
Activation Energy (Ea)
Definition
The minimum amount of energy that the reacting species must have to undergo a specific reaction.
Term
Catalyst
Definition
A substance that speeds up a chemical reaction without itself being consumed.
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