File Name: materials non metals and metals 8th cbse science .zip
- Materials-metals and non-metals-NCERT Solutions
- Chapter 4 - Materials : Metals and Non Metals Class 8 questions
- CBSE Class 8 Science Chapter 4 Revision Notes
Science is a critical skill that inculcates logical reasoning and out-of-the-box analytical abilities. Studying Science will enable you to get much better at abstract reasoning. If you ever thought was difficult, you will find your perspective changing once you understand the concepts distilled in these Book PDF guides. The subjects that the students take in their class 12 is also the basis for their career choice they take up.
Materials-metals and non-metals-NCERT Solutions
These solutions for Metals And Nonmetals are extremely popular among Class 8 students for Science Metals And Nonmetals Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Basic Science Book of Class 8 Science Chapter 6 are provided here for you for free. Example: This property of metals is used to make steel cables for carrying heavy loads.
They break down on stretching. Hydrogen H , nitrogen N , oxygen O , chlorine Cl and argon Ar are five non-metals that are gaseous at room temperature. Potassium and sodium are two metals that react vigorously with cold water. Three uses of oxygen: a It is required in all combustion processes. Three uses of nitrogen: a It is used by plants for making proteins.
Five physical characteristics of metals are: a They have a high tensile strength; therefore, they cannot be broken down easily. Five physical characteristics of non-metals are: a They are brittle; i.
Carbon is a non-metal. When it is red-hot, it reacts with steam. This reaction forms a gaseous mixture of carbon monoxide and hydrogen, called water gas.
Three uses of metals are: a Iron is used for making tools, machines and agricultural equipment because it is very strong, tough and cheap. Thus, it is used in thermometers. Uses of carbon: a Graphite is used in making pencils. Thus, it is used as an electrode. Activity series is an ordered arrangement of metals and hydrogen non-metal with respect to their activities. The reactivity of a metal decreases down the activity series. Metals that are placed above hydrogen in the activity series can displace hydrogen from dilute hydrochloric acid and sulphuric acid.
Metals that are placed below hydrogen in the activity series cannot displace hydrogen from acids. Example: Sodium is placed above hydrogen; therefore, it can displace hydrogen from hydrochloric acid. Following activity shows that the lead of a pencil conducts electricity and sulphur does not. Take a pencil and sharpen both its ends. Connect the ends of the pencil to an electric circuit, formed by connecting a bulb to the cell.
The bulb glows when pencil is connected to it. This shows that the lead of a pencil conducts electricity. This occurs because lead contains graphite, which is a good conductor of electricity. Now, replace the pencil with a piece of sulphur. The bulb will stop glowing. This shows that sulphur does not conduct electricity. Graphite and iodine are lustrous non-metals. All metals are good conductors of heat and electricity.
The so-called lead black part of a pencil is made of clay and graphite. Though a metal, mercury is a liquid at ordinary temperatures. Argon is used for filling electrical bulbs.
Liquid nitrogen is used to preserve donated organs. Substance Property 1 Property 2 1. Neon A. Metal p. Ductile B, s B. Non-metal q. Malleable 2. Graphite C. Solid r. Kills germs B, C, u D. Liquid s. Non-reactive 3. Conducts electricity 4.
Answer: a We cannot draw wires from a piece of wood or coal because they are brittle. Answer: Hydrogen H , nitrogen N , oxygen O , chlorine Cl and argon Ar are five non-metals that are gaseous at room temperature. Answer: Potassium and sodium are two metals that react vigorously with cold water. Answer: Three uses of oxygen: a It is required in all combustion processes. Answer: Three uses of nitrogen: a It is used by plants for making proteins.
Answer: An alloy is a homogenous mixture of metals or metals and non-metals. Answer: Five physical characteristics of metals are: a They have a high tensile strength; therefore, they cannot be broken down easily. Answer: Five physical characteristics of non-metals are: a They are brittle; i. Answer: Carbon is a non-metal. Answer: Three uses of metals are: a Iron is used for making tools, machines and agricultural equipment because it is very strong, tough and cheap.
Answer: Uses of carbon: a Graphite is used in making pencils. Answer: Activity series is an ordered arrangement of metals and hydrogen non-metal with respect to their activities. Answer: Following activity shows that the lead of a pencil conducts electricity and sulphur does not. Answer: 1. Answer: d bromine Bromine is a non-metal that is liquid at ordinary temperatures.
Answer: d All of these All the given options are solid non-metals. Answer: a silver Silver is the best conductor of electricity. Answer: d all of these All the mentioned metals are placed above copper in the reactivity series and can replace copper from a solution of copper II sulphate.
Answer: d neon Neon is used in advertisement signs. Answer: Substance Property 1 Property 2 1.
Chapter 4 - Materials : Metals and Non Metals Class 8 questions
Question 1. Question 2. Question 3. Question 4. Question 5. Question 6.
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CBSE Class 8 Science Chapter 4 Revision Notes
Video Format solution is also available. Ask your doubts and answer the questions asked by your friends through Discussion Forum The first part of Class 8 Science Chapter 4 content focuses on the importance of metallurgy which is related to materials science and engineering that studies the physical and chemical behaviour of metallic elements, their inter-metallic compounds, and their mixtures.
Which of the following can be beaten into thin sheets? Which of the following statements is correct? Fill in the blanks.
Chemical Properties of Metals and Non-metals: Reaction with Oxygen: Both metals and non-metals when burnt in oxygen from their oxides. Oxides of metals are basic in nature while that of non-metals are generally acidic in nature e. Reaction with Water: Some metals react with water to produce metal hydroxide and hydrogen gas. Generally, non-metals do not react with water. Reaction with Acids: Metals react with dii.
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