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POP QUIZ

POP QUIZ. Science Achievement Standard 1.5. Answer the following. Write the formulae for Aluminium sulfate Ammonium carbonate Calcium chloride Explain how sodium oxide has the balanced formula of Na 2 O Compare and contrast C12 and C14 Explain how the lithium atom is neutral

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POP QUIZ

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  1. POP QUIZ Science Achievement Standard 1.5

  2. Answer the following • Write the formulae for • Aluminium sulfate • Ammonium carbonate • Calcium chloride • Explain how sodium oxide has the balanced formula of Na2O • Compare and contrast C12 and C14 • Explain how the lithium atom is neutral • Compare and contrast the magnesium atom and ion

  3. Balancing formulae • Aluminium Sulfate • Al2(SO4)3 • Ammonium Carbonate • (NH4)2CO3 • Calcium Chloride • CaCl2

  4. Explain how sodium oxide has the balanced formula na2o • The sodium ion has a charge of +1 (because the atom has lost 1 valence electron to form the ion with a charge of +1) • And the oxide ion has a charge of -2 (because the atom has gained 2 electrons to form an oxide ion with a charge of -2). • The ionic compound sodium is neutral overall so for the charges to be balanced, there must be 2 positive sodium ions to 1 negative oxide ion.

  5. Compare and contrast c12 and c14 • Both C12 and C14 are the carbon element as they have the same atomic number. • They therefore have 6 protons and 6 electrons. • They both have the same electron configuration of 2,4 • However C12 has 6 neutrons in its nucleus so the atomic mass is 12, whereas C14 has 8 neutrons so its atomic mass is 14. • C12 and C14 are isotopes.

  6. EXPLAIN HOW THE LITHIUM ATOM IS NEUTRAL • For an atom to be neutral, it needs to have its positive and negative charges balanced • When elements are in their atomic form, they are neutral. • Lithium has an atomic number of 3 so it has 3 positive protons in its nucleus and 3 negative electrons in the shells. • The charges are balanced so the lithium atom is neutral

  7. Compare and contrast the magnesium atom and ion • Similarities: • Differences:

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