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34 Cards in this Set
- Front
- Back
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Acid
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a substance which can form hydrogen ions (H+) in solution
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alkali
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a base that is soluble in water
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atom
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particles too small to see, that make up all matter
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base
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a substance which can form hydroxide ions (OH-) in solution
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chemical bond
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an attractive force between atoms holding them together
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compound
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a pure substance that contains atoms of 2 or more elements combined in a fixed ratio
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electron
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a tiny negatively charged particle found in the space around a nucleus
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indicator
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a substance that turns different colours in acid and basic solutions
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ion
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an atom or group of atoms that has a positive or negative charge
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isotopes
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atoms of the same element that have different numbers of neutrons
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molecule
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a tiny particle containing 2 or more atoms in a fixed ratio and joined by chemical bonds
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neutralisation
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the react of acid and base to form salt and water
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neutron
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a neutral (uncharged) subatomic particle in the nucleus of an atom
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pH
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a scale from 0 to 14 that indicates how acidic or basic something is
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polymer
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a substance composed of giant molecules formed by linking smaller molecules together
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proton
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a positively charged subatomic particle in the nucleus of an atom
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radioactive decay
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the process by which an unstable nucleus loses energy by emitting radiation
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salt
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a compound formed when acid reacts with a base, a metal or a carbonate
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Chemical Reaction.....
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Reactants -------> Products
LHS RHS |
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Photosynthesis
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light + 6CO2 + 12H20 -----------> C6H12O6 + 6O2 + 6H20
LHS = Reactants RHS = Products |
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Particles
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Electron, Proton and Neutron
Negitive, Positive and Neutral Shells, Nucleous, Nucleous |
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Changes in.....
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Change in Electrons -----> ion
Change in Protons -------> element changes Change in neutrons ------> isotope |
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Neuclear Radiation
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Alpha - Least dangerous
Beta Gamma - Most dangerous |
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Half Life
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Half life is the time in which it takes for a radioactive material to decay.
Example- I 25 has a half life of 10 years. We have 2kg of I 25 How much after 40years? 10 Years ---- 1kg 20 Years ---- 500kg 30 Years ---- 250kg 40 Years ----125kg |
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An endothermic reaction is....
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when a reaction takes energy from your body generally in the form of heat.
Example: Urea in Water |
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An exothermic reaction is:
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when a reaction releases energy thus making it feal hot.
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Universal Indicator in Acid turns....
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RED
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Universal Indicator in Base turns....
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BLUE
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What is a variable in an experiment?
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A variable in an experiment is the reactant that can be changed.
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pH of acids
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0-6
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pH of bases
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8-14
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What is the law of conservation
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Mass in a reaction is always cconserved. The inital mass of the reactant is alwasy equal the final mass of the products.
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an acid concatins
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H-
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a base contains
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OH-
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