Q.1
What is matter?
Ans:
Anything which has mass/weight and occupies space is called matter. Everything around us is made up of matter.
What are states of matter?
Ans:
Matter can exist as a Solid, a Liquid or a Gas. These three forms of matter are called the 'States of Matter'. For example water (liquid) can exist as ice (solid) or water vapors (gas).
Write the properties of three (03) states of matter?
Ans:
Everything around us is made up of matter. Matter can exist in three (03) different states. Below is the properties of these three (03) states of matter.
Solid:
Solids have fixed shape, fixed volume and cannot be compressed.
Liquid:
Liquids have not fixed shape but fixed volume and cannot be compressed.
Gas:
Gas have not fixed shape, not fixed volume and can be compressed.
Below is the list of four substances at 20 C
1) Mercury 2) Oil 3) Water Vapour 4) Common Salt
a)-
Which of the sudstances does not have fixed shape and volume, and can be compressed?
Ans:
Water vapour does not have fixed shape and volume, and can be compressed.
b)-
Which of the sudstances contains the most orderly arrangement of particles?
Ans:
Common salt contains the most orderly arrangement of particles
a)-
In which state of matter can the particles move most freely?
Ans:
In state of gas the particles can move most freely.
b)-
In which state of matter are the particles closest together?
Ans:
In state of solid the particles are closest together.
Using the kinetic particle theory,
a)-
Explain why liquids have fixed volumes but not fixed shapes.
Ans:
Liquid have fixed volumes but not fixed shapes because liquid particles are arranged disorderly and are less closely packed together.
b)-
Explain why ice has a higher density than water vapour.
Ans:
Ice has a higher density than water vapour because the particles of solid are arranged orderly and are closely packed together.
Q.8
What is melting point?
Ans:
The temperature at which a solid becomes a liquid is called its melting point.
What is freezing?
Ans:
When a substance changes from a liquid to a solid, we say that it is freezing.
What is freezing point?
Ans:
The temperature at which a liquid becomes a solid is called its freezing point. Heat energy is given out during the cooling process.
What is matter?
Ans:
Anything which has mass/weight and occupies space is called matter. Everything around us is made up of matter.
------------------------
Q.2What are states of matter?
Ans:
Matter can exist as a Solid, a Liquid or a Gas. These three forms of matter are called the 'States of Matter'. For example water (liquid) can exist as ice (solid) or water vapors (gas).
------------------------
Q.3Write the properties of three (03) states of matter?
Ans:
Everything around us is made up of matter. Matter can exist in three (03) different states. Below is the properties of these three (03) states of matter.
Solid:
Solids have fixed shape, fixed volume and cannot be compressed.
Liquid:
Liquids have not fixed shape but fixed volume and cannot be compressed.
Gas:
Gas have not fixed shape, not fixed volume and can be compressed.
-----------------------
Q.4Below is the list of four substances at 20 C
1) Mercury 2) Oil 3) Water Vapour 4) Common Salt
a)-
Which of the sudstances does not have fixed shape and volume, and can be compressed?
Ans:
Water vapour does not have fixed shape and volume, and can be compressed.
b)-
Which of the sudstances contains the most orderly arrangement of particles?
Ans:
Common salt contains the most orderly arrangement of particles
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Q.5 a)-
In which state of matter can the particles move most freely?
Ans:
In state of gas the particles can move most freely.
b)-
In which state of matter are the particles closest together?
Ans:
In state of solid the particles are closest together.
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Q.6Using the kinetic particle theory,
a)-
Explain why liquids have fixed volumes but not fixed shapes.
Ans:
Liquid have fixed volumes but not fixed shapes because liquid particles are arranged disorderly and are less closely packed together.
b)-
Explain why ice has a higher density than water vapour.
Ans:
Ice has a higher density than water vapour because the particles of solid are arranged orderly and are closely packed together.
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Q.7
What is melting?
Ans:
When a substance changes from a solid to liquid, we say that it is melting.
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What is melting point?
Ans:
The temperature at which a solid becomes a liquid is called its melting point.
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Q.9What is freezing?
Ans:
When a substance changes from a liquid to a solid, we say that it is freezing.
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Q.10What is freezing point?
Ans:
The temperature at which a liquid becomes a solid is called its freezing point. Heat energy is given out during the cooling process.
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