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Chemistry
10th
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88 Terms
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1
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Avogadro’s number
Number of atoms in 1 mol
Approximately 6.02 x 10^23
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Hydrocarbons
Substances that contain hydrogen and carbon
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Combustion
Exothermic reaction that occurs when oxygen reacts quickly with a substance to form a new substance
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Endothermic reaction
Chemical reaction that absorbs energy
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Exothermic reaction
Chemical reaction that releases energy
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Neutralization
Process in which acids and bases react with each other so that the H+ ion and OH- ion combine to make a single water molecule
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Diatomic molecule
Molecule composed of two atoms of the same element
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Covalent bond
Bond formed when non-metallic atoms share electrons
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Molecule
Group of non-metallic atoms bound together by covalent bonds
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Multivalent elements
Element with more than one stable ion
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Polyatomic ions
Charged particle made up of several non-metallic atoms joined together
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Law of conservation of mass
Total mass of the reactants in a chemical reaction equals the total mass of the products
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Salting
Method of drying food to preserve it, salt draws water out of food
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Fermentation
Biochemical preservation technique involving bacteria
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MSDS
Material safety data sheet
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WHMIS
Workplace hazardous materials information system
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Hydrated compounds
Compounds that contain water as a part of their structure
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Molar mass
Mass of 1 mole of a substance, sum of the atomic masses of all the pieces of the compound
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Mole
Specific group of objects
Atom, molecule, eggs
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Double replacement reaction
Compound + Compound > Compound + Compound
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Single replacement reaction
Compound + Element > Compound + Element
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Combustion reaction
Fuel + Oxygen > Carbon Dioxide + Water
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Decomposition reaction
Compound > Element + Element
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Formation reaction
Element + Element > Compound
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Non-Metal ion
Gains electrons, negative charge
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Metal ion
Lose electrons, positive charge
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Cation
Positive ion
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Anion
Negative ion
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Ionic compound
Metal + non-metal
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Formation of ionic compound
Some elements pick up an extra electron or two or three
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Valence shell
The outer shell
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Occurrence of chemical bonding
When two particles can exchange or combine their outer electrons in a way that is attractive
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Chemical bonding
The interaction of electrons from one atom with the electrons of another atom
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Mass number
Mass of the nucleus
\# of neutrons = atomic mass - atomic #
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Atomic number
Number of protons
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Isotope
Different format of the same element, have a different number of neutrons
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Noble gases
Group 18
Non-reactive
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Halogens
Reactive non-metals in group 17
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Transition metals
Group 3-12
Hardness, high density, high melting and boiling points
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Alkaline earth metals
Group 2
General white colour, malleable, extrudable, and machineable
Less reactive
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Alkali metals
Group 1
Soft and silvery
React vigorously with water and must be stored in oil
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Properties of metalloids
State may vary
Colour could vary
May conduct electricity but not well
Could be malleable or ductile
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Properties of non-metals
Gas, liquid, solid
Colour differs
Cannot conduct
Not malleable or ductile
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Properties of metals
Most solid at room temperature, except mercury
Silver or grey in colour, shiny
Good conductors of heat and electricity
Malleable and ductile
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Arrangement of groups
Elements in the same group all share similar physical and chemical characteristics
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Arrangement of periods
All elements in the same row have the same energy level
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Group
Vertical column
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Period
Horizontal row
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Demetri Mendeleev
Father of the modern periodic table
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Neutron
No charge
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Electron
Negative charge
Lightest subatomic particle
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Proton
Positive charge
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Most of the mass of an atom
The nucleus
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Makes up the nucleus
Protons and neutrons
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Neils Bohr
Proposed that electrons exist in energy levels
Move in electron shells
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Nucleus
Tiny dense center of the atom
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Ernest Rutherford
Discovered the nucleus and proposed that electrons move around the nucleus
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Hantaro Nagaoka
Suggested that the atom represents the solar system
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Raisin bun model
J.J. Thompson’s model
Atom is a positively charged sphere with small negative charges embedded
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J.J. Thompson
Atoms seemed to have either a positive or negative charge
Discovered the electron
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John Dalton
All matter is made up of small particles called atoms
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Aristotle
First ever talked about matter being made up of elements
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Atomists
They disagreed with the early Greek views
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Early Greeks
Believed that all matter was made of only four things, fire, water, earth and air
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Examples of chemical properties
Reaction with acid, ability to burn, behavior in air, reactions to heat, poisonous, toxic, explosive
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Examples of physical properties
Melting point, boiling point, hardness, state at room temperature, ductility, malleability
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Chemical property
Describes how a substance interacts with other substances such as acids
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Physical property
Describes the physical appearance and composition of a substance
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Properties
Characteristics that can be used to describe a substance
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Sublimation
Solid > Gas
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Deposition
Gas > Solid
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Gas
Particles are separated by large spaces and move quickly, take shape of the container
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Liquid
The particles are touching but can flow past each other, takes shape of the container
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Solid
Particles are packed so closely together that they can only vibrate in place
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Plasma
Results when a large amount of energy is added to a gas
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Determines the state
Temperature
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States of matter
Solid, liquid, gas, plasma
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Matter
Anything that has mass and takes up space
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Colloids
Cloudy mixture where the particles are so small that they cannot be easily separated, milk
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Suspensions
Cloudy mixture with tiny particles of one substance held within another, can be separated, tomato juice
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Aqueous solution
If dissolved in water
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Homogeneous mixture
One substance (solute) is dissolved into another (solvent) creating a substance that looks like one substance, sugar in hot coffee
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Heterogeneous mixture
All different parts of the substance are visible
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4 types of mixtures
Heterogeneous, homogeneous, suspension, colloid
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Mixture
A combination of pure substances that have not chemically combined to form a compound
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Compound
Created when 2 or more elements combine chemically in fixed proportions
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Elements
Cannot be broken down into any simpler substance, organized into the periodic table
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Pure substance
Mad up of only one kind of matter, has a unique set of properties