NCERT / CBSE Class 10 Science Chapter 3 Metals and Non-metals Notes and Best Solutions, Video Classes, Live Problem Classes, Worksheet, Test Exam Paper
Melting and Boiling Point
Most of the metals are hard, except alkali metals, such as sodium, potassium, lithium, etc. are very soft metals. These can be cut by using a knife.
Most of the metals are strong and have high tensile strength. Because of this, big structures are made using metals, such as copper (Cu) and iron (Fe). (Except Sodium (Na) and potassium (K) which are soft metals).
Metals are solid at room temperature except for mercury (Hg).
Metals produce ringing sound, so, metals are called Sonorous. Sound of metals is also known as Metallic sound. This is the cause that metal wires are used in making musical instruments.
Metals are malleable. This means metals can be beaten into a thin sheet. Because of this property, iron is used in making big ships.
Metals are ductile. This means metals can be drawn into thin wire. Because of this property, a wire is made of metals.
Metals have generally high melting and boiling points. (Except sodium and potassium metals which have low melting and boiling point.)
Most of the metals have a high density.
Most of the metals are grey in colour. But gold and copper are exceptions.
Class 10th Science Other Chapter Solutions
- Chapter 1: Chemical Reactions and Equations
- Chapter 2: Acids, Bases, and Salts
- Chapter 3: Metals and Non-Metals
- Chapter 4: Carbon and its Compounds
- Chapter 5: Periodic Classification of Elements
- Chapter 6: Life Processes
- Chapter 7: Control and Coordination
- Chapter 8: How do Organisms Reproduce?
- Chapter 9: Heredity and Evolution
- Chapter 10: Light – Reflection and Refraction
- Chapter 11: Human Eye and Colourful World
- Chapter 12: Electricity
- Chapter 13: Magnetic Effects of Electric Current
- Chapter 14: Sources of Energy
- Chapter 15: Our Environment
- Chapter 16: Management of Natural Resources
Frequently asked questions
- Is a liquid at room temperature?
Mercury is the metal which is liquid at room temperature
- Can be easily cut with a knife?
Sodium and potassium are the metals which can be cut with a knife
- Is the best conductor of heat?
Silver is the best conductor of heat
- Is a poor conductor of heat?
Mercury is poor conductor of heat.
- Explain the meanings of malleable and ductile.
Metals which can be beaten to sheets are said to be malleable.
Metals which can be drawn into thin wires are said to be ductile.
- Why is sodium kept immersed in kerosene oil?
Sodium is a reactive metals, if kept open it will react with oxygen to explore and catch fire. Sodium metal is kept immersed in kerosene to prevent their reaction with oxygen, moisture and carbon dioxide of air.