Right side of the periodic table represents non-metals which are less in numbers than metals. Metals and non-metals have different chemical properties. They both react with oxygen to give oxides, but they have distinguished properties.
A non-metal oxide is acidic in nature because when they react with water, they form acids. One such non-metal oxide is sulphur dioxide.
Sulphur oxide's acidic nature is justified when it is reacted with water. It gives sulphurous acid.
An acid when reacts with a base forms a salt. This is the another way to identify the acidic nature of a non-metallic oxide. These oxides when reacts with a base, acts as an acid to give salts.
- A triatomic gas is released during the fermentation of sugars in bread. It is also produced by combustion of wood, peat and other organic materials and fossil fuels such as coal, petroleum and natural gas. Name the gas formed and justify its acidic nature on the basis of above established methods.
Important Questions on Materials: Metals and Non-Metals
A brown shiny metal known as cuprum is used since ancient times. It easily gets corroded when exposed to air. The metal is used in buildings, usually for roofing, and oxidises to form a green verdigris like in the case of 'Statue of Liberty'. The Statue of Liberty is a colossal neoclassical sculpture on Liberty Island in New York Harbour in New York City, in the United States. The metal statue, a gift from the people of France to the people of the United States, was designed by French sculptor Frédéric Auguste Bartholdi and its metal framework was built by Gustave Eiffel. The statue was dedicated on October .
The image for then and now of the statue is shown below.
Identify the metal and mention its two uses. What is the green layer formed over the statue?
A class 8 student Rajesh accidentally touched a wire whose outer cover was damaged. He got a shock as the current was running through the wire, but fortunately no major mishap happened. What material do you think, are wires made of? And why do you think coated wire protect us from getting a shock?
Rahul is collecting some materials so that he can make a ringing bell for his school. The teacher informed Rahul that, it should produce a very good sound, and it should catch everyone's attention because of its shining surface. It should not break easily. Can you help Rahul to find desirable material for his work? Which property is responsible for producing sound?
A doctor diagnosed a patient with iron deficiency, and gave him tablets containing iron. But the tablets were not hard and did not look like iron at all.
What do you think the tablets contained?
Arun and his elder brother Ravi went to the hotel for lunch. After having little food, they felt full and thought to pack the remaining food, so they called a waiter and told him to pack the remaining food. After some time, the waiter came along with a silvery-white box and gave it to Ravi. After seeing the silvery-white box, Arun asked Ravi what kind of material was used to make this box. Then Ravi said that it is made up of aluminium, which is a metal, and he explained the physical properties of metals.
Now, can you give a reason why aluminium foil is used to wrap food items?
