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Engineering
A-Level Applied General Business
AQA
Chemistry
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A-Level Applied General Business
AQA
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38 Terms
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Elements
Substances that cannot be broken down into simpler substances
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Oxygen
Element used to build biological molecules and form storage compounds
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Carbon
Element used to build biological molecules and form storage compounds
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Hydrogen
Element used to build biological molecules and form storage compounds
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Nitrogen
Element used to build biological molecules and form storage compounds
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Trace elements
Elements required by an organism in very small quantities
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Iron
Trace element required by an organism in very small quantities
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Iodine
Trace element required by an organism in very small quantities
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Copper
Trace element required by an organism in very small quantities
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Subatomic particles
Protons, neutrons, and electrons that make up atoms
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Protons
Positively charged particles in an atom
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Neutrons
Uncharged particles in an atom
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Electrons
Negatively charged particles in an atom
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Isotopes
Atoms with the same number of protons but different number of neutrons
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Compounds
Consist of two or more elements held together by chemical bonds
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Ionic bond
Formed when one or more electrons are transferred between atoms
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Covalent bond
Formed when electrons are shared between atoms
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Non-polar covalent bond
Covalent bond where electrons are shared equally between atoms
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Polar covalent bond
Covalent bond where electrons are shared unequally between atoms
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Water
Versatile molecule with special properties like cohesion and adhesion
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Hydrogen bonds
Weak chemical bonds that hold water molecules together
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Cohesion
Tendency of water molecules to stick together
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Adhesion
Tendency of water molecules to stick to other substances
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Capillary action
Ability of water to rise up the roots, trunks, and branches of trees
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Surface tension
Property of water where the surface has tension and light things can sit atop
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Acids
Substances that release a lot of hydrogen ions in water
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Bases
Substances that release a lot of hydroxide ions in water
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pH scale
Scale used to measure the acidity or alkalinity of a solution
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Organic molecules
Molecules with carbon that are important for life
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Inorganic compounds
Molecules that do not contain carbon atoms
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Polymers
Chains of building blocks in macromolecules
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Monomers
Individual building blocks of a polymer
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Dehydration synthesis
Reaction where a water molecule is lost and a larger compound is formed
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Hydrolysis
Process of breaking down polymers into monomers using water
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Carbohydrates
Organic compounds central to life on Earth
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Proteins
Organic compounds central to life on Earth
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Lipids
Organic compounds central to life on Earth
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Nucleic acids
Organic compounds central to life on Earth