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Chemistry 11 Exam
Exam definitions
84
Chemistry
11th Grade
01/20/2024

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Term
Quantum
Definition
The smallest unit of something that's possible.
Term
Atom
Definition
The smallest unit of an element with the properties of the element.
Term
Electron shell
Definition
The set of all orbitals having the same n-value.
Term
Electronegativity
Definition
The tendency of an atom to attract electrons from an atom it's bonded to.
Term
Sub-shell
Definition
A set of orbitals of the same type.
Term
Photon
Definition
A quantum of light.
Term
Solution
Definition
A homogeneous mixture where a solute has been dissolved in a solvent.
Term
Molecule
Definition
A particle containing two or more atoms bonded together .
Term
Anion
Definition
A negatively charged ion.
Term
Isotopes
Definition
Atomic species with the same atomic number but different atomic masses due to a different number of neutrons in the nucleus.
Term
Valence electrons
Definition
The electrons in the outermost shell of an atom.
Term
Density
Definition
The quantity of mass per volume.
Term
Meniscus
Definition
The curved surface of a liquid.
Term
Unit
Definition
A standard amount of a physical quantity.
Term
Base unit
Definition
The base units are the set of fundamental units from which all other units are based.
Term
Sig Figure
Definition
A meaningful digit in a value, consisting of all the certain digits in the measurement plus one uncertain digit (the last one)
Term
Conversion factor
Definition
A ratio (fraction) used to relate one set of unit to another.
Term
Accuracy
Definition
a measure of how close a value is to the true or accepted value.
Term
Burette
Definition
laboratory equipment used for dispensing and measuring the volume of a chemical solution.
Term
Molecular weight
Definition
The same of the atomic masses for the atoms in the compound.
Term
Presision
Definition
A measure of the reproducibility of a measurement.
Term
Experimental uncertainty
Definition
The estimated amount by which a measurement might be in error
Term
Concentration
Definition
The amount of solute in a given volume.
Term
Molar mass
Definition
The mass of one mole of particles
Term
Molar volume
Definition
The volume of one mole of particles
Term
Avogadro's constant
Definition
The number of things in one mole: 6.022  × 10 ^22 mol-1
Term
Mole
Definition
The quantity of atoms in an atomic mass of something
Term
Mole fraction
Definition
The number of moles of a compound in a mixture divided by the total number of moles in the mixture.
Term
Solution
Definition
A homogeneous mixture where a solute is dissolved in a solvent.
Term
Molecular Formula
Definition
The full chemical formula for a compound
Term
Percent Composition
Definition
The mass percentage of each element in a compound
Term
Empirical Formula
Definition
The simplified, lowest-common-denominator chemical formula showing the whole-number ratio of atoms in a compound.
Term
Partial pressure
Definition
the pressure exerted by an individual gas in a mixture, ignoring the other gases present.
Term
Stoichiometry
Definition
The relationship between the relative quantities of substances taking part in a reaction
Term
Molarity
Definition
Molar concentration; the number of moles of solute per litre of solution (mol/L;M)
Term
Theoretical yield
Definition
The amount of a product calculated form 100% complete reaction of the limiting reagent
Term
Surroundings
Definition
Everything in the universe except what is being studied
Term
Open system
Definition
A system where energy and matter can enter and leave.
Term
Limiting reagent
Definition
The substance that is totally consumed when the chemical reaction is complete.
Term
Closed system
Definition
A system where energy can enter and leave but matter cannot.
Term
Purity
Definition
The percentage of a specific substance inn a sample.
Term
System
Definition
A part of the universe being studied
Term
Actual yield
Definition
The amount of product produced or collected.
Term
Percent Yield
Definition
The ratio of actual yield to theoretical yield, expressed as a percentage.
Term
Excess reagent
Definition
A substance that has leftovers when the chemical reaction is complete.
Term
Isolated system
Definition
a system where energy not matter can enter or leave.
Term
Endothermic
Definition
The process of absorbing heat.
Term
Green chemistry
Definition
Chemistry with a focus on reducing waste and other negative effects on the environment.
Term
Oxidation
Definition
A reaction where oxygen reacts with a substance to form an oxide and release heat.
Term
Catalyst
Definition
A substance that speeds up a chemical reaction without itself being consumed.
Term
Enthalpy (H)
Definition
The total amount of heat energy contained in a system.
Term
Exothermic
Definition
A process of releasing heat.
Term
Activation energy (Ea)
Definition
The minimum amount of heat energy contained in a system.
Term
Transition state
Definition
The chemical arrangement with the highest potential energy for reaction.
Term
Potential energy
Definition
Stored energy (in chemical bonds for molecules)
Term
Crude product
Definition
Raw unpurified product collected from a reaction.
Term
Bond dissociation energy
Definition
Amount of energy required to break a bond.
Term
Solute
Definition
Term
Solute
Definition
A substance being dissolved
Term
Solvation
Definition
The interaction between a solute and solvent where solute particles become completely surrounded by solvent molecules.
Term
Soluble
Definition
The solute can be dissolved by the solvent to form a solution.
Term
Unsaturated
Definition
Able to contain more dissolved solute
Term
Saturated
Definition
Containing as much dissolved solute as possible.
Term
Solubility
Definition
The maximum amount of solute that can be dissolved in a given solvent at a given temperature.
Term
Solvent
Definition
The substance in which the solute is dissolved
Term
Immiscible
Definition
Insoluble in each other and separates into two phases or layers
Term
Supersaturated
Definition
Containing more of a solute than is stable.
Term
Dissociation
Definition
The separation of already existing ions from an ionic solid.
Term
Lewis Base
Definition
An electron donor
Term
Neutral
Definition
When a solution has an equal concentration of hydronium and hydroxide ions.
Term
Lewis acid
Definition
an electron acceptor
Term
Spectator ions
Definition
Ions that exist in the same form on both the reactants and products side of a chemical equation.
Term
Basic
Definition
When a solution has a greater concentration of hydroxide ions than hydronium ions.
Term
Acidic
Definition
When a solution has a greater concentration of hydronium ions than hydroxide ions.
Term
Ionization
Definition
The separation of a neutral, covalent molecule into ions through a reaction with the solvent.
Term
Empirical
Definition
Based on observation or experience rather than theory.
Term
Titration
Definition
A method of determining the exact concentration of a solution through known chemical reaction.
Term
Hormone
Definition
An organic molecule that travels in the blood to send a signal in the body.
Term
Synthetic
Definition
Means made by people through chemical synthesis; artificial
Term
Structural isomers
Definition
Compounds having the same atoms, but different connectivity and bonding between those atoms.
Term
Natural
Definition
Existing in or caused by nature (not people)
Term
Vitamin
Definition
An organic molecule that an organism requires in small amounts to function properly.
Term
Stereoisomers
Definition
Compounds having the same atoms and connectivity, but different 3D spatial arrangements.
Term
Organic Chemistry
Definition
The study of structures, properties, and behaviours or carbon-based molecules.
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