UNIT 2-ATOMS, MOLECULES AND STOICHIOMETRY🤎

Question 1

Define the unified atomic mass unit

Answer 1

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Question 2

Define relative atomic mass (Ar) and relative molecular mass (Mr) in terms of the unified atomic mass unit

Answer 2

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Question 3

Define relative isotopic mass and relative formula mass in terms of the unified atomic mass unit

Answer 3

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Question 4

define a mole and Avogadro’s constant

Answer 4

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Question 5

write the formulae for the following ions: nitrate, carbonate, sulphate, hydroxide, ammonium, zinc, silver, hydrogen carbonate and phosphate

Answer 5

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Question 6

Explain how to write a balanced ionic equation for this reaction: FeSO4(aq) + 2NaOH(aq)—> Fe(OH)2(s) + Na2SO4(aq)

Answer 6

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Question 7

define the empirical and molecular formula, calculate the empirical and molecular formula given data (3 questions in the book)

Answer 7

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Question 8

explain the meaning of the words: anhydrous, hydrated and water of crystallisation

Answer 8

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Question 9

give the formula triangle and units for number of moles, molar gas volume and concentration, perform calculations involving reacting masses (calculate 2 examples in the book)

Answer 9

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Question 10

perform calculations involving the limiting reactant and maximum mass (2 examples in the book)

Answer 10

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Question 11

perform calculations involving stoichiometry (1 example in the book)

Answer 11

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Question 12

perform calculations involving percentage composition and percentage yield (2 examples in the book)

Answer 12

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