Oquizy

Back in the lab, John tries dropping a piece of zinc into copper(II) sulfate solution. Which observation and explanation is correct?

Blue color darkens as more copper ions form. Hydrogen gas evolves as zinc reacts with water in the solution. No reaction occurs because zinc is less reactive than copper. Zinc dissolves and brown copper forms because zinc is more reactive than copper.

At the scrapyard, Xinyi points at a rusted chain and says, 'That’s oxidation for you!' Which of the following is essential for the rusting of iron to occur?

Both water and oxygen Heat and oxygen Only oxygen Only water

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.

Xinyi challenges John to predict which carbonate decomposes most easily upon heating. Given: calcium carbonate, zinc carbonate, copper(II) carbonate, and silver carbonate. Which is the correct order from most stable to least stable?

Calcium carbonate > Zinc carbonate > Copper(II) carbonate > Silver carbonate Silver carbonate > Copper(II) carbonate > Zinc carbonate > Calcium carbonate Silver carbonate > Zinc carbonate > Copper(II) carbonate > Calcium carbonate Zinc carbonate > Calcium carbonate > Silver carbonate > Copper(II) carbonate

During a practical, Xinyi tests four elements for conductivity and lustre. Only one is shiny and conducts electricity well. Which is it?

Argon Chlorine Magnesium Sulfur

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

Quiz: Chemistry - Patterns In The Periodic Table