Question

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Answer 1

Question 4:-

• Compressibility is the ability to be reduced to a lower volume when force is applied. Solids are incompressible as their particles are held together. So, we can tell that compressibility is negligible in solids.

Question 5 :-

• In general, the volume of liquid is more than the volume of solid as the particles of liquids are more free to move thereby more volume. But in case of ice, density of water is maximum at 4°C .The density of ice is less than that of water. Therefore it floats on water.

Question 8:-

• Ice has a lower density than water because of hydrogen bonding and cage-like structure of ice.
• Ice has hexagonal three-dimensional crystal structure (as per X-ray crystallographic data). This hexagonal crystal structure is formed due to intermolecular hydrogen bonding.
• When ice melts, some of hydrogen bonds break and some empty spaces are occupied by water molecules. Liquid water molecules are more closely packed than molecules in ice. Hence, ice has lower density than water

Question 9:-

• A substance may exist in any of the three states of matter (i.e. solid, liquid or gas) depending upon the conditions of temperature and pressure. By changing the conditions of temperature and pressure, a substance can be made to exist as solid, liquid or a gas.

Answer 2

Answer:

Question 4:-

• Compressibility is the ability to be reduced to a lower volume when force is applied. Solids are incompressible as their particles are held together. So, we can tell that compressibility is negligible in solids.

Question 5 :-

• In general, the volume of liquid is more than the volume of solid as the particles of liquids are more free to move thereby more volume. But in case of ice, density of water is maximum at 4°C .The density of ice is less than that of water. Therefore it floats on water.

Question 8:-

Ice has a lower density than water because of hydrogen bonding and cage-like structure of ice.

Ice has hexagonal three-dimensional crystal structure (as per X-ray crystallographic data). This hexagonal crystal structure is formed due to intermolecular hydrogen bonding.

• When ice melts, some of hydrogen bonds break and some empty spaces are occupied by water molecules. Liquid water molecules are more closely packed than molecules in ice. Hence, ice has lower density than water

Question 9:-

• A substance may exist in any of the three states of matter (i.e. solid, liquid or gas) depending upon the conditions of temperature and pressure. By changing the conditions of temperature and pressure, a substance can be made to exist as solid, liquid or a gas.