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ACIDS, BASES, SALTS and H Scale
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Four types of Chemical Equations
Synthesis two or more elements or compounds may combine to form a more complex compound. Basic form: A + X → AX EX. 2Mg(s) + O2(g) → 2MgO(s) Decomposition A single compound breaks down into its component parts or simpler compounds. Basic form: AX → A + X Ex. CaCO3(s) → CaO(s) + CO2(g)
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Four types of Chemical Equations
Single Replacement: a more active element takes the place of another element in a compound and sets the less active one free Basic form: A + BX → AX + B EX. Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) Double Replacement: parts of two compounds switch places to form two new compounds. Two reactants yield two new products EX. AB + XY ---> AY + XB EX. NaCl + H2SO4 ---> Na2SO4 + HCl
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Acids HCl or H2SO4 H+1 + H2O H3O+1
Acids are chemicals in which the positive ion is a hydrogen atom. HCl or H2SO4 When mixed with water they produce a free hydrogen ion that combines with a water molecule to produce a hydronium ion (H3O) H+1 + H2O H3O+1 An acid is a substance that releases hydrogen ions when it breaks apart in water.
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Physical Properties of Acids
Taste sour React with metals to produce hydrogen 2HCl + 2Na 2NaCl + H2 Conduct electricity.
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Bases Bases are substances in which the negative ion is an ion called hydroxide (OH)-1 For example; NaOH, or KOH used to make soap, household cleaners, fertilizers, and explosives.
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Physical Properties of Bases
Taste bitter Feel slippery Conduct electricity Sometimes Caustic. That is they eat away at certain substances and they are irritating or damaging to skin.
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Salts A salt is a compound formed from the positive metal ions of a base and a negative nonmetal ion of an acid. NaCl, K2SO4 Are the product of a reaction between an acid and a base, along with water.
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Physical Properties of Salts
They form crystals when in solid form They usually have a higher hardness because of their ionic bonding. An acid plus a base yields a salt and water. HCl + NaOH NaCl + HOH HCl + NaOH NaCl + H2O
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Neutralization A reaction between an acid and base.
The products of a neutralization reaction are a salt and water.
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The pH Scale The pH scale gives a measure of the concentration of positive hydrogen ions in a solution. a way of describing the acidic or basic strength of a solution. the acidity of a solution can be expressed by using the pH scale
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The pH Scale the scale ranges from 0 to 14
acids range from 0 to 6, with 0 being the strongest acid bases range from 8 to 14, with 14 being the strongest base. pure water, which is neither acid nor base, has a pH level of 7 or is neutral
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Indicators Indicators are substances that visibly show a change in the nature of a chemical system. Universal indicator- an acid/base indicator that shows, by color, the pH of a substance.
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Indicators 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ACIDIC NEUTRAL BASIC
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