Questions for practice Flashcards
Questions about the topics
Determine the number of protons, neutrons and electrons in the following:
a) 35 Cl
17
b) 235 U
92
c) 88 Sr
38
d) 16 O
8
a) p = 17, e = 17, n = 35-17 = 18
b) p = 92, e = 92, n = 235-92 = 143
c) p = 38, e = 38, n = 88-38 = 50
d) p = 8, e = 8, n = 16-8 = 8
Determine the number of protons, neutrons and electrons in the following:
a) Fluoride ion (mass of 19)
b) Iron - 56
c) Magnesium ion (mass of 25)
a) P = 9, E = 10, N = 19-9 = 10
b) P = 26, E = 26, N = 56-26 = 30
c) P = 12, E = 10, N = 25-12 = 13
Write the electron configuration for the following:
a) sulfur
b) magnesium ion
c) oxide
a) 2,8,6 (16 electrons)
b) 2,8 (12 electrons but because it is an ion it loses its last two so that it can have a full outer shell
c) 2,8 (8 electrons but gained two because it is an ion so it has a full outer shell)
Write the nucleus symbol notation for the element with 35 protons and 46 neutrons
81 Br
35
Write the name of the following:
a) Cu²⁺
b) S²⁻
c) CaO
d) K⁺
a) Copper (II)
b) Sulfide
c) Calcium Oxide
d) Pottasium
Write the formula for the following:
a) Iron (II) bromide
b) Magnesium oxide
c) Magnesium nitride
d) Manganese (IV) sulfide
a) FeBr₂
b) MgO
c) Mg₃N₂
d) MnS₄
Name the following:
a) Ca(OH)₂
b) KNO₃
c)Ba₃(PO)₄
a) Calcium hydroxide
b) Potassium nitrate
c) Barium phosphate
Write the formula for the following:
a) Sodium phosphate
b) Copper (II) ethanoate
c) Ammonium fluoride
a) Na₃PO₄
b) Cu(CH₃COO)₂
c) NH₄F
Identify the following as covalent or ionic:
a) NiCl₂
b) SO₂
c) NF₃
d) NaF
a) ionic
b) covalent
c) covalent
d) ionic
Name the following:
a) PO₄³⁻
b) KOH
c) MgO
d) PCl₃
e) Ca₃N₂
f) N₂O₃
a) phosphorus tetraoxide or phosphate ion
b) pottasium hydroxide
c) Magnesium oxide
d) phosphorus trichloride
e) calcium nitride
f) dinitride trioxide
Write the formula of the following:
a) Sulfur dichloride
b) Copper (II) phosphide
c) dinitrogen monosulfide
d) aluminium chloride
a) SCl₂
b) Cu₃P₂
c) N₂S
d) AlCl₃
Write the following reactions as word equations:
a) hydrochloric acid reacts with magnesium metal. As the metal dissolves hydrogen gas bubbles off and magnesium chloride is formed
b) solutions of lead nitrate and sodium iodine are added together. Immediately a yellow precipitate of lead iodine is formed in a solution of sodium nitrate
a) hydrochloric acid + magnesium —-> hydrogen + magnesium chloride
b) lead nitrate + sodium iodine —> lead iodine + sodium nitrate
State the number of each type of atom in the following:
a) MgSO₄
b) (NH₄)₃PO₄
c) 4Co (CH₃COOH)₃
d) 3Al₂(Cr₂O₇)₃
e) 2Ca (MnO₄)₂
a) 1 magnesium, 1 sulfur, 4 oxygen
b) 3 nitrogen, 12 hydrogen, 1 phosphorus, 4 oxygen
c) 4 cobalt, 48 hydrogen, 24 carbon, 24 oxygen
d) 6 aluminium, 18 chromium, 63 oxygen
d) 2 calcium, 4 manganese, 16 oxygen
Balance these equations:
a) NaCl + CuO —> Na₂O + CuCl₂
b) Mg + O₂ —> MgO
c) HCl+ Ca(OH)₂ —> CaCl₂ + H₂O
d) H₂SO₄ +Na —> Na₂SO₄ + H₂
a) 2NaCl + CuO —> Na₂O + CuCl₂
b) 2Mg + O₂ —> 2MgO
c) 2HCl+ Ca(OH)₂ —> CaCl₂ + 2H₂O
d) H₂SO₄ + 2Na —> Na₂SO₄ + H₂
State the charge from the ions found from elements in group:
a) 2
b) 13
c) 17
a) +2
b) +3
c) -1
Write the electron configuration for:
a) phosphorus
b) oxide
a) 2, 8, 5 (15 electrons)
b) 2, 8 (8 electrons but because the ending is -ide it means it is an ion that has gained 2 electrons)
Identify the following as ionic or covalent and name them:
a) P₂O₅
b) NaOH
c) ZnCl₂
D) OCl₂
a) covalent - diphosphorous pentaoxide
b) ionic - sodium hydroxide
c) ionic - zinc chloride
c) covalent - oxygen dichloride
Write the formula for:
a) Scadium (II) chloride
b) Sulfur difluoride
c) methane
a) ScCl₂
b) SF₂
c) CH₄
Balance the following:
Ca(OH)₂ + NaNO₃ —> Ca(NO₃)₂ +NaOH
Ca(OH)₂ + 2NaNO₃ —> Ca(NO₃)₂ +2NaOH
Write a formula equation with states for:
Carbon dioxide gas was bubbled through a solution of calcium hydroxide. A precipitate of calcium carbonate is formed, and water is formed.
CO₂ (g) + Ca(OH)₂ (aq) —> CaCO₃ (s) + H₂O (l)
