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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

The next puzzle shows melting points of three metals from the same group: 181°C, 98°C, and 63°C. The metals are Lithium, Sodium, and Potassium. Which metal corresponds to the lowest melting point, and why?

Lithium, because it's the smallest atom Potassium, because melting point decreases down Group I Potassium, because metallic bonding gets stronger down the group Sodium, because it's in the middle

The room floods with bromine water! John panics, but Xinyi stays calm. A screen appears: "Predict what happens when chlorine gas is bubbled through this bromine water."

Bromine gas is released No reaction Solution turns colourless Solution turns reddish-brown

Just before exiting, the floor shakes. The final question flashes: "Xinyi finds a mystery metal. It forms green solutions, can exist as both 2+ and 3+ ions, and catalyses the Haber process. Which element is it likely to be?"

Copper Iron Magnesium Zinc

During a chemistry lab, Xinyi is asked to identify element sample using the following information: It forms coloured compounds with chloride ions. It catalyzes the decomposition of hydrogen peroxide. It has a high melting point. Which group of the Periodic Table is this element most likely from?

Group 1 Group 18 Group 2 Transition metals

Xinyi conducts two separate electrolysis reactions: one using molten sodium chloride, and another using copper(II) sulfate solution with copper electrodes. Despite copper being less reactive than sodium, she notices far more heat released in the sodium chloride setup. What explains the higher energy release?

Copper has a lower ionisation energy, so it forms bonds less exothermically. Extracting sodium involves breaking strong ionic bonds and a large energy drop upon reduction. Sodium gains electrons more easily, so the reaction is faster. Sodium is a group 1 metal, so its compounds release more energy.

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.

In an experiment, Xinyi heats lithium, sodium, and potassium in air. The observations are recorded: Lithium: slow burn, red flame; Sodium: moderate burn, yellow flame; Potassium: vigorous burn, lilac flame. Which trend is best illustrated?

Decreasing reactivity down the group Increasing flame temperature down the group Increasing metallic character down the group Increasing reactivity down the group

Quiz: Chemistry - Patterns In The Periodic Table