Oquizy

John is examining two unknown elements, A and B, from the same period. A has 2 valence electrons, while B has 6. Which statement best compares their chemical and physical properties?

A and B have the same number of electron shells. A forms basic oxides while B forms acidic oxides. A is likely to be a gas and B a solid at room temperature. A is more non-metallic than B.

John finds a glowing test tube containing iodine solution. A final screen pops up: "If bromine water is added to potassium iodide solution, what observable change happens?"

Effervescence observed Solution stays colourless Solution turns reddish-brown Yellow solid forms

Xinyi is arranging a set of unknown elements in a table. She notices their properties change gradually. To correctly arrange them like in the Periodic Table, how should she order them?

By increasing mass number By increasing neutron number By increasing number of isotopes By increasing proton number

In the final test, Xinyi gives John this puzzle: 10g of iron(III) oxide (Fe₂O₃) reacts with carbon monoxide in the blast furnace. How many grams of iron are produced? (Relative atomic masses: Fe=56, O=16)

10.0g 5.6g 7.0g 7.8g

Which element below would likely form a coloured ion with a +3 oxidation state?

Aluminium Iron Magnesium Sodium

During a school experiment, John burns magnesium in steam to show a reaction with water at high temperatures. What is the balanced equation for this reaction?

2Mg(s) + H₂O(g) → Mg(OH)₂(s) + H₂(g) Mg(s) + 2H₂O(l) → Mg(OH)₂(aq) + H₂(g) Mg(s) + H₂O(g) → MgO(s) + H₂(g) Mg(s) + O₂(g) → MgO(s)

Quiz: Chemistry - Patterns In The Periodic Table