Reactivity series - hydrogen, carbon, carbonates

Carbon can displace tin from tin oxide, forming tin and

Metals, starting from ______________ and those below, can be extracted from their metal oxides by heating with hydrogen.

Thermal decomposition of CaCO₃ produces

• CO₂ and H₂O

• H₂O

• CaO and H₂O

• CaO and CO₂

Presence of carbon dioxide can be proved by bubbling the gas into

• Universal Indicator

• litmus solution

• limewater

• water

Potassium carbonate and sodium carbonate cannot be decomposed by heat because

• they have high thermal stability

• they decompose readily when heated

• potassium and sodium are unreactive metals

• these carbonates are unreactive carbonates

Heating copper(II) carbonate produces copper(II) oxide and carbon dioxide.

When silver carbonate is heated, the products are silver, oxygen and carbon dioxide.

Choose all that are correct:

• copper(II) oxide is thermally stable

• silver oxide decomposes readily when heated

• silver carbonate cannot be decomposed

• carbon dioxide is broken down by heat, forming oxygen

The ____________ the position of the metal is in the reactivity series, the more thermally stable its carbonate is.

Metal ores are metal compounds found naturally on Earth. Carbon can be used to extract (displace) pure metals from their ores. This only applies to metals _____ __________ than carbon.

Metals above carbon cannot be displaced from their compounds by carbon. Hence, extracting metals like calcium from calcium ore requires the passing of _____________ through it.

Silver and gold metals can be found naturally and uncombined with other elements. This is because they are relatively