(a) List in tabular form three chemical properties on the basis of which we can differentiate between a metal and a non-metal. (b) Give reasons for the following: (i) Most metals conduct electricity well. (ii) The reaction of iron (III) oxide with heated aluminium is used to join cracked machine parts.
(a) List in tabular form three chemical properties on the basis of which we can differentiate between a metal and a non-metal. (b) Give reasons for the following: (i) Most metals conduct electricity well. (ii) The reaction of iron (III) oxide with heated aluminium is used to join cracked machine parts.
(a) Here is the table listing three chemical properties to differentiate between a metal and a non-metal: | Property | Metal | Non-Metal | | --- | --- | --- | | Reaction with Oxygen | Reacts with oxygen to form basic oxides. | Reacts with oxygen to form acidic oxides. | | Reaction with Water | Does not react with cold water. | Does not react with cold water. | | Reaction with Acids | Does not react with dilute acids. | Does not react with dilute acids. | (b) (i) Most metals conduct electricity well because they have free electrons that can move freely within the metal lattice. These free electrons are responsible for the electrical conductivity of metals. (ii) The reaction of iron (III) oxide [Fe2O3] with heated aluminium is used to join cracked machine parts because it produces a large amount of heat, which helps to melt the metal and join the cracked parts together. This process is known as thermite welding.
Marking Scheme
- 1(a) 1 mark for each correct property listed in the table
- 2(b) 1 mark for each correct explanation given
Hint
Recall the chemical properties of metals and non-metals, and understand the reasons behind these properties. Apply this knowledge to explain why most metals conduct electricity well and how the reaction between iron (III) oxide and heated aluminium is used to join cracked machine parts.
Quick Oral Answer
To differentiate between a metal and a non-metal, we can look at their chemical properties. Metals typically react with oxygen to form basic oxides, while non-metals react with oxygen to form acidic oxides. Additionally, metals do not react with cold water, while non-metals also do not react with cold water. Finally, metals do not react with dilute acids, while non-metals also do not react with dilute acids. Most metals conduct electricity well because they have free electrons that can move freely within the metal lattice. The reaction between iron (III) oxide and heated aluminium is used to join cracked machine parts because it produces a large amount of heat, which helps to melt the metal and join the cracked parts together. This process is known as thermite welding.
Analysis & Explanation
This question requires the student to recall the chemical properties of metals and non-metals, as well as understand the reasons behind these properties. The student must also be able to apply this knowledge to explain why most metals conduct electricity well and how the reaction between iron (III) oxide and heated aluminium is used to join cracked machine parts.
Common Mistakes
- 1confusing the properties of metals and non-metals
- 2not understanding the reasons behind the properties of metals and non-metals
- 3not applying the knowledge to explain the given scenarios
Interesting Facts
Metals are typically shiny and malleable, while non-metals are dull and brittle.
The reaction between iron (III) oxide and heated aluminium is highly exothermic, producing a large amount of heat.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2019?
This question carries 5 marks in the CBSE Class 10 Science 2019 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Chemical Properties of Metals and Non-Metals" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2019 paper?
This is a Long Answer question from Section D in the CBSE Class 10 Science 2019 paper.