quiz #4 a solution of lead (ii) nitrate is added to aqueous potassium iodide and a precipitate of...
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Quiz #4
A solution of lead (II) nitrate is added to aqueous potassium iodide and a precipitate of lead (II) iodide and aqueous potassium nitrate is formed.
a) Write a word equation for the reactionb) Write a skeleton equatonc) Write a balanced chemical equationd) What type of chemical reaction is this?
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What is an Acid?
• A substance that produces H+ ions in solution• **an acid is only an ‘acid’ when dissolved in
solution (water) – must be aqueous.
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What is a Base?
Most bases are substances that produce hydroxide ions (OH-) when dissolved in water.
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What is an Indicator?
• Are chemicals that change colour in the presence of acids or bases.
• Many indicators will change one colour in an acid and another colour in a base.
• We can use the characteristic colour change of an indicator to identify a substance as being an acid or base.
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The pH scale
• pH = power of hydrogen• A scale that measures the concentration of
hydrogen ions in solution.
• 0 ---acidic--- 7 (neutral)--basic– 14 -the lower the pH, -the higher the pH,
the more H+ is the less H+ is present present (lower concentration)(higher concentration)
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Quiz #5
Hydrogen gas and oxygen gas are put under electrolysis to produce water.
1. Write the word equation2. Write the skeleton equation3. Write a balanced chemical equation4. What type of reaction is this?
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Fluorine gas reacts with hydrochloric acid to produce hydrofluoric acid and chlorine gas.
1. Word2. Skeleton3. Balanced4. Type of reaction