Give two reasons to justify ------- (a) water at room temperature is a liquid. (b) an iron almirah is a solid at room temperature.
Answers
Explanation:
Ans. (a) Water at room temperature exists as liquid because its melting point is below room temperature while boiling point (100º C) is above room temperature. Similarly, (i) A fixed mass of water occupies a fixed volume.
An iron almirah is a solid at room temperature because its melting point as well as boiling point is above room temperature. Similarly, (i) An iron almirah is rigid and has a fixed shape. (ii) The density of metal is quite high. Hence, iron almirah is a solid at room temperature
Explanation:
a) Water at room temperature is a liquid.
Water at room temperature is liquid due to the presence of hydrogen bond. These bonds hold water molecules together for small fractions of a second. Water molecules move continuously. In gaseous matter there is random movement. Because of the hydrogen bonds, the water molecules come together they stick to one another for a small, but significant amount of time. This reduces the motion of them and holds them closer to one another. This property makes the water liquid at room temperature
Characteristics of liquid
Liquid has the following characteristics:
At room temperature, water has no shape but has a fixed volume i.e., it occupies the shape of the container in which it is kept.
At room temperature, water flows easily.
b) An iron almirah is a solid at room temperature.
An iron almirah is a solid at room temperature (25°C) because:
It has a definite and rigid shape and
Fixed volume like a solid at room temperature.
On applying external force the shape does not get deformed