12 Questions
When burning magnesium in air, what color flame is produced?
White
Which litmus paper should be used to test the product formed on burning magnesium?
Both red and blue litmus paper
What type of oxides do most non-metals produce when dissolved in water?
Acidic oxides
Which metal mentioned is a liquid at room temperature?
Sodium
What property of metals allows them to be good conductors of heat?
High melting points
Why are silver and copper known as the best conductors of heat among the metals?
High melting points
Which statement about the physical properties of metals and non-metals is incorrect based on the text?
Alkali metals have high melting points compared to other metals.
In Activity 3.5, students observed that metals have high melting points except for:
Gallium
Diamond, an allotrope of carbon, is known for its:
High hardness
Why are school bells often made of metals according to the text?
Due to their sonorous nature
What is the purpose of coating electric wires with PVC or rubber-like material?
To protect against electric shocks
What can be inferred about the chemical properties of alkali metals based on the text?
They can be cut with a knife due to their softness.
Discuss the general physical properties of metals and non-metals based on observations recorded in Table 3.1. Understand how elements differ in terms of hardness, malleability, ductility, conductivity, sonority, heat, and electricity. Explore the exceptions to grouping elements solely based on physical properties.
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