8969784
Descrição
FlashCards por Natalia Cliff, atualizado more than 1 year ago
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Criado por Natalia Cliff
mais de 7 anos atrás
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| Questão | Responda |
| What is limestone? | mainly composed of the compound calcium carbonate (CaC03). It is quarried and used as a building material |
| What is the first step of the limestone cycle? | Calcium carbonate thermally decomposes to make calcium oxide and carbon dioxide CaCO3 (s) -> CaO (s) + CO2 (g) |
| What is the second step of the limestone cycle? | Calcium oxide reacts with water to produce calcium hydroxide CaO (s) + H2O (l) -> Ca(OH)2 (s) |
| What is the third step of the limestone cycle? | Solution of calcium hydroxide (add a lot more water) reacts with Carbon dioxide to produce calcium carbonate Ca(OH)2 (aq) + CO2 (g) -> CaCO3 (s) |
| The carbonates of what metals react in a similar way to calcium when thermally decompose | Magnesium, zinc, sodium and copper specifically react to make a metal oxide and CO2, but all other alkali metals do as well. However, they won't all thermally decompose at temperatures reached by a bunsen burner |
| What is Calcium hydroxide used for? | Calcium hydroxide is alkaline and can therefore be used to neutralise acidic fields |
| What happens when carbonates react with acids | Carbonates react with acids to produce carbon dioxide, a salt and water. Hence limestone is damaged by acid rain |
| How do you make cement? | Limestone is heated with clay to make cement |
| How do you make mortar? | Cement is mixed with sand |
| How do you make concrete? | Cement is mixed with sand and aggregate (small rocks) |
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