Year 9 Chemistry Test - Limestone
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Slaked lime is a common name for which one of the following?
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Calcium carbonate
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Calcium oxide
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Calcium hydroxide
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This Year 9 Chemistry Test on Limestone assesses knowledge on limestone's composition, its derivatives like calcium oxide and hydroxide, and uses in concrete. It evaluates understanding of limestone processing and benefits, crucial for foundational chemistry education.
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- 2.
How do you produce calcium oxide from calcium carbonate?
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By heating it
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By adding water to it
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By neutralising excess acidity
Correct Answer
A. By heating itExplanation
Calcium oxide is produced from calcium carbonate by heating it. When calcium carbonate is heated, it undergoes a chemical reaction called thermal decomposition, which breaks it down into calcium oxide and carbon dioxide. This process is commonly known as calcination. The heat causes the carbonate ions in calcium carbonate to break apart, resulting in the formation of calcium oxide.Rate this question:
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- 3.
Limestone is mostly made of what?
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Calcium oxide
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Calcium carbonate
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Calcium hydroxide
Correct Answer
A. Calcium carbonateExplanation
Limestone is mostly made of calcium carbonate. This is because limestone is a sedimentary rock that forms from the accumulation of the remains of marine organisms such as coral and shells, which are primarily composed of calcium carbonate. Over time, these remains are compressed and cemented together to form limestone. Calcium oxide and calcium hydroxide are both derived from calcium carbonate through chemical reactions, but they are not the primary components of limestone.Rate this question:
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- 4.
Water is one of the ingredients of concrete. What are the other ingredients?
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Clay, sand and crushed rock
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Soda, sand and crushed rock
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Cement, sand and crushed rock
Correct Answer
A. Cement, sand and crushed rockExplanation
The correct answer is cement, sand, and crushed rock. Water is indeed one of the ingredients of concrete, but it is not the only one. Concrete is made by mixing cement, sand, crushed rock, and water together. Cement acts as a binding agent, while sand and crushed rock provide the necessary strength and stability to the mixture.Rate this question:
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- 5.
What is an advantage of using concrete to make building foundations?
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It is strong when stretched.
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It is strong when squashed.
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It is worn away by acid rain.
Correct Answer
A. It is strong when squashed.Explanation
Concrete is a preferred material for building foundations because it has high compressive strength, meaning it can withstand a significant amount of force when squashed or compressed. This strength allows the foundation to support the weight of the structure above it and resist any potential settlement or movement. Additionally, concrete is also durable and resistant to many environmental factors, including acid rain, which means it can withstand long-term exposure without being worn away.Rate this question:
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- 6.
What is a benefit of a limestone quarry?
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There is a lot of dust and noise.
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There is employment for local people.
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It causes acid rain.
Correct Answer
A. There is employment for local people.Explanation
A benefit of a limestone quarry is that it provides employment opportunities for local people. Quarrying operations require a workforce to extract and process the limestone, creating jobs in the local community. This can contribute to economic growth and development by providing income and livelihoods for individuals and families. Additionally, the presence of a quarry can stimulate other businesses in the area, such as transportation and construction, further boosting employment opportunities.Rate this question:
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- 7.
Which of the following is a disadvantage of using glass for windows?
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It is transparent.
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It is tough and difficult to break.
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It can trap too much heat in a building in the summer.
Correct Answer
A. It can trap too much heat in a building in the summer.Explanation
Glass can trap too much heat in a building during the summer because it is a poor insulator. This means that it allows heat to pass through it easily, causing the interior of the building to become hot. This can result in the need for excessive air conditioning to cool down the space, leading to increased energy consumption and higher utility bills.Rate this question:
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- 8.
Why can gold be found in the Earth's crust in its native state?
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Gold is more reactive than silver.
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Gold is very unreactive.
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Gold is very rare.
Correct Answer
A. Gold is very unreactive.Explanation
Gold can be found in the Earth's crust in its native state because it is very unreactive. Unlike other metals, gold does not easily combine with other elements or form compounds. This makes it less likely to undergo chemical reactions and allows it to remain in its pure form for long periods of time. Additionally, gold's unreactivity also contributes to its durability and resistance to corrosion, making it highly valued and sought after for various purposes throughout history.Rate this question:
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- 9.
Why is aluminium extracted from aluminium ore by electrolysis?
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Aluminium is more reactive than carbon.
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Aluminium is less reactive than carbon.
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Aluminium is an expensive metal.
Correct Answer
A. Aluminium is more reactive than carbon.Explanation
Aluminium is extracted from its ore by electrolysis because it is more reactive than carbon. Electrolysis is a process that uses an electric current to separate elements from compounds. Since aluminium is more reactive than carbon, it cannot be extracted by carbon reduction, which is a common method for extracting less reactive metals. Instead, electrolysis is used to break down the aluminium ore into its pure form. This process involves passing an electric current through a molten mixture of aluminium oxide and cryolite, causing the aluminium ions to be reduced and deposited at the cathode.Rate this question:
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- 10.
Why is iron extracted from iron ore by reduction with carbon or carbon monoxide?
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Iron is more reactive than carbon.
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Iron is less reactive than carbon.
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Iron is a cheap metal.
Correct Answer
A. Iron is less reactive than carbon.Explanation
Iron is extracted from iron ore by reduction with carbon or carbon monoxide because iron is less reactive than carbon. This means that iron has a lower tendency to form compounds with other elements compared to carbon. By using carbon or carbon monoxide, the iron in the ore can be separated from the oxygen and other impurities, allowing for the extraction of pure iron. This method is cost-effective and widely used in the industry.Rate this question:
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- 11.
Which properties make aluminium suitable for overhead mains electricity cables?
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It has a low density and is a good conductor of electricity.
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It is shiny and is a good conductor of heat.
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It is a good conductor of electricity and heat.
Correct Answer
A. It has a low density and is a good conductor of electricity.Explanation
Aluminium is suitable for overhead mains electricity cables because it has a low density, which makes the cables lighter and easier to install. Additionally, aluminium is a good conductor of electricity, allowing for efficient transmission of electrical energy through the cables.Rate this question:
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- 12.
What happens to iron oxide in a blast furnace?
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It is oxidised to form iron.
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It is electrolysed to form iron.
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It is reduced to form iron.
Correct Answer
A. It is reduced to form iron.Explanation
In a blast furnace, iron oxide is reduced to form iron. Reduction is a chemical reaction in which oxygen is removed from a substance. In this case, the iron oxide is heated with a carbon source, such as coke, which acts as a reducing agent. The carbon reacts with the oxygen in the iron oxide, causing the oxygen to be removed and leaving behind pure iron. This reduction process is an important step in the production of iron in a blast furnace.Rate this question:
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- 13.
In comparison with steel, what is pure iron like?
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Harder
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Magnetic
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Softer
Correct Answer
A. SofterExplanation
Pure iron is softer compared to steel. This is because steel is an alloy made up of iron and other elements, such as carbon. The presence of these additional elements in steel strengthens its structure and makes it harder. In contrast, pure iron lacks these additional elements, making it softer and more malleable.Rate this question:
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- 14.
What is the percentage of iron in the iron from a blast furnace?
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100%
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96%
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4%
Correct Answer
A. 96%Explanation
The correct answer is 96%. In a blast furnace, iron is extracted from iron ore. The iron obtained from a blast furnace is not pure, as it contains impurities such as carbon, sulfur, and other elements. The percentage of iron in the iron obtained from a blast furnace is approximately 96%, with the remaining 4% being impurities.Rate this question:
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- 15.
Which type of steel is likely to be used for making cutlery?
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Low carbon steel
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High carbon steel
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Stainless steel
Correct Answer
A. Stainless steelExplanation
Stainless steel is likely to be used for making cutlery because it is a corrosion-resistant and durable material. It contains a high percentage of chromium, which forms a protective layer on the surface of the steel, preventing it from rusting or staining. This makes stainless steel ideal for cutlery as it can withstand frequent use, exposure to moisture, and contact with acidic foods without deteriorating. Additionally, stainless steel is easy to clean and maintain, making it a practical choice for cutlery items.Rate this question:
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- 16.
Why are alloys likely to be harder than pure metals?
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Because layers of atoms can slide over each other easily.
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Because layers of atoms cannot slide over each other easily.
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Because their atoms are denser and harder than those of pure metals.
Correct Answer
A. Because layers of atoms cannot slide over each other easily.Explanation
Alloys are likely to be harder than pure metals because the addition of different elements in alloys disrupts the regular arrangement of atoms, making it difficult for layers of atoms to slide over each other. This disruption creates a stronger and more rigid structure, resulting in increased hardness compared to pure metals.Rate this question:
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- 17.
Transition metals are like other metals in what ways?
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They are dull.
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They are good conductors of electricity.
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They are on the right hand side of the periodic table.
Correct Answer
A. They are good conductors of electricity.Explanation
Transition metals are like other metals in the way that they are good conductors of electricity. This is a characteristic shared by most metals, including transition metals. Being able to conduct electricity is a property of metals due to the presence of free electrons that can move freely within the metal's structure, allowing for the flow of electrical current.Rate this question:
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- 18.
What process is used to purify copper?
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Electrolysis
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Filtration
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Reduction in a blast furnace
Correct Answer
A. ElectrolysisExplanation
Electrolysis is the process used to purify copper. In this process, an electric current is passed through a copper sulfate solution, causing the copper ions to move towards the negative electrode (cathode) and deposit onto it, while impurities settle at the bottom as sludge. This method allows for the separation of pure copper from impurities, resulting in purified copper that can be used for various applications. Filtration is not the correct answer as it is a method used to separate solid particles from a liquid or gas. Reduction in a blast furnace is also not the correct answer as it is a method used to extract iron from its ore.Rate this question:
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- 19.
Why does aluminium not corrode quickly?
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It is an unreactive metal.
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It has a thin layer of aluminium oxide on its surface.
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It reacts with oxygen but not with water.
Correct Answer
A. It has a thin layer of aluminium oxide on its surface.Explanation
Aluminium does not corrode quickly because it has a thin layer of aluminium oxide on its surface. This oxide layer acts as a protective barrier, preventing further oxidation of the metal. It forms a tight and stable bond with the underlying aluminium, making it resistant to corrosion. This oxide layer also helps to prevent the metal from reacting with other substances, such as water or oxygen, further contributing to its low reactivity and slow corrosion rate.Rate this question:
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- 20.
Why is titanium expensive to extract from its ore?
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It resists corrosion.
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Several stages are involved.
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Its ore is rare.
Correct Answer
A. Several stages are involved.Explanation
Titanium is expensive to extract from its ore because the extraction process involves several stages. Each stage requires specific equipment, chemicals, and expertise, which adds to the overall cost. The extraction process includes crushing and grinding the ore, followed by chemical processing to remove impurities and separate titanium from other elements. Additionally, titanium ore is relatively rare, making it more difficult and costly to mine and extract compared to other metals. This scarcity further contributes to the high cost of extracting titanium from its ore.Rate this question:
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Oct 24, 2024Quiz Edited by
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Mar 23, 2011Quiz Created by
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