Grade 8 Science : Properties of Matter : Part 4

We have discussed about elements and compounds in the previous article. Today, we shall explore the physical properties inculcated in substances that help us to identify them properly. 

 

• Brittleness – This is the ability of a substance to break apart or shatter in to pieces easily, when a force is exerted.  Eg: Glass 
• Lustre – The ability of a substance to reflect light that falls on it. (The quality of shining). Eg: Gold 
• Hardness – A substance is embedded with hardness if it can resist to wearing, tearing and scratching.

This measures the resistance to external forces. Eg : Diamond

• Sonority – This is showcased by producing an acute sound/ noise when hit with an object. 

Eg: Aluminum

 

 

• Smell/ Odor – This is the scent of a particular substance. It is the sensation that results from the volatility of a substance.  Eg: Chlorine
• Thermal Conductivity - The ability of a substance to conduct heat. Eg: Copper
• Electrical Conductivity - This property portrays how well a substance allows electricity to travel through it. Eg: Iron, Aluminum 
• Color – The visual quality or the hue of a substance as recognized by humans .Eg:  Carbon (Black)
• Ductility – The ability of a substance to be stretched out in to a long wire without breaking. Eg: Copper, Gold
• Density –This measures the amount of mass per unit volume. This shows how closely the particles are packed. 
• Texture – This is the way the substance feels to the touch. It can be smooth, coarse, silky, rough and etc. 
• Malleability – The ability of a substance to be hammered in to a thin sheet without breaking in to pieces.  Eg: Gold, Aluminum
• Elasticity – The substances that have the ability to stretch when it’s pulled and return to its former shape when the force is released.
• Expansivity – This is measured by the ability of a substance to increase its volume, while not changing its mass when the temperature is increased.
• Melting Point / temperature – This is the temperature at which the state of a substance changes from solid state to liquid state.
• Boiling point / temperature – This is the temperature at which the state of a substance changes from liquid state to gaseous state / vapor.

 

 

 

 

 

 

 

 

 

by Mekhala Egodawele

Photo source : Internet