937159
| Pregunta | Respuesta |
| What is limestone's chemical name? | Calcium Carbonate |
| What is calcium carbonate's chemical formula? | CaCO3 |
| What does limestone break down into when heated? | Calcium oxide and carbon dioxide |
| When calcium oxide reacts with water, what is the product? | Calcium hydroxide |
| What are 3 of the uses of limestone? | Mortar, cement and concrete |
| Calcium carbonate breaks down when heated strongly. What is this reaction called? | Thermal decomposition |
| What are the equations for the thermal decomposition of calcium carbonate? | calcium carbonate --> (with heat) calcium oxide + carbon dioxide CaCO3 --> (with heat) CaO + CO2 |
| Calcium oxide reacts with water to form calcium hydroxide, which is an alkali. What are the equations for this reaction? | Calcium Oxide + H20 → Calcium Hydroxide CaO + H2O → Ca(OH)2 |
| (FILL IN THE GAP) Calcium oxide reacts with water to form calcium hydroxide. A lot of _______ is produced in this reaction. | Heat |
| How do we get limestone? | We quarry it. |
| (FILL IN THE GAP) Carbonates react with acids to form carbon dioxide, _______ and _________. | 1) a salt 2) water (H2O) e.g. calcium carbonate + hydrochloric acid → carbon dioxide + calcium chloride + water CaCO3 + 2HCl → CO2 + CaCl2 + H2O |
| What can carbon dioxide be detected by? | Limewater |
| Calcium hydroxide is used to neutralise excess acidity. Give examples. | In lakes and soils affected by acid rain |
| Cement is made by mixing powdered limestone with ______? | Clay |
| Mortar, used to join bricks together, is made by mixing ________ with _____ and _______? | Cement, sand, water |
| Concrete is made by mixing __________ with sand, ________ and _____________? | Cement, water, aggregate |
| Limestone, mortar and cement slowly react with carbon dioxide. This causes _________. | Erosion |
| What can we reinforce concrete with to make is stronger? | Steel |
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