gases
D. Short answer questions.
1. Copper is used for household wiring. Why?
2. Wooden log floats on water and does not sink. Why?
3. With respect to inter-particle spaces rate differentiate between liquid and
4. Solids have lowest diffusion rate. Why?
5. When salt dissolves in water, where does it go?
6. Why are handles of cooking vessels made of wood?
7. Name two substances which have a lusture.
8. What is diffusion?
9. Define density. How is the floating and sinking of a substance related to its densin
Answers
Q. 1 Answer:- The lower the level of resistivity, the more electrical conductivity a metal has. Copper has low resistivity, and therefore is an excellent conductor. Copper is also less oxidative than other metals.
Q. 2 Answer:- The answer depends on the type of wood and determines whether that wood would float or sink. This ratio between weight and volume is called density. An object that is less dense than water can be held up by water, and so it floats. ... The logs that float are less dense than the logs that sink.
Q. 3 Answer:- The inter particle space in liquids is more in caparison to solids. In gases the particles are far apart from each other. They move about freely in the total space available to them. The inter particle space in gases in the most as compared to solids and liquids.
Q.4 Answer:- Diffusion in solid: Diffusion takes place with slowest rate in the case of solids. ... Since the particles of solid have lowest kinetic energy so they do not move. Hence, diffusion takes a long time in the case of solid.
Q. 5 Answer:- Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Q. 6 Answer:- Cooking pots are provided with wooden or plastic handles because they are bad conductors of heat. This prevents the heat from the pan to transfer to our hand. Thus, we can hold the utensils comfortably by our hands.
Q. 7 Answer:- Any two substances that have lustre are iodine and silver.
Lustre is all about the way light and electrons interact with each other on a metal and reproduce a shiny glow.
Q. 8 Answer:- Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.
Q. 9 Answer:- Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.
Answer:
1)Because copper is a good conductor
2)wood has very low density.
3)question is not complete.
4)because they are usually smooth surfaces
5)it doesn't go anywhere...it mixes with water...
6)because wood is a insulator.
7)metals and diamond.
8) irregular reflection is called diffusion.
9)Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.
Explanation:
pls mark me brainliest....and be my follower...