I'd like quick and simple answers to these 5 chemistry questions please. Read on...?

Question

1. Liquids generally have lower density compared to their solid state. Then why does ice float on water?

2. Why are we able to sip hot tea faster from a saucer than from a cup?

3. How does water kept in an earthen pot become cool during summer?

4. Why does a desert cooler cool better on a hot, dry day?

5. List all the difference between homogenous and heterogenous mixtures

I don't have bonding in my school textbook, though I do understand all about bonding due to external resources. I won't get full marks in an exam for the first question if I write about bonds. Is there a simpler answer? The first and fifth answerers are top contenders for the best answer.

I don't have bonding in my school textbook, though I do understand all about bonding due to external resources. I won't get full marks in an exam for the first question if I write about bonds. Is there a simpler answer? The first and fifth answerers are top contenders for the best answer.

Answer 1

1. Ice is one of the only known liquids that actually expands as it freezes. This is due to hydrogen bonds forming between the water molecules, which line up molecules less efficiently (in terms of volume) when water is frozen.

2. Tea in a saucer has much more surface area than tea in a cup, therefore it cools much faster.

3. These pots are made of a material with the property of insulating and protecting the water from infrared light. With less infrared light, the water is cooler.

4. Water is a green house gas, which means the more water there is in the air; the more infrared light reflecting off the ground (which initially comes from sunlight of the visible spectrum) will be reflected back to earth. On a dry day, with less clouds and moisture, infrared light is better able to escape into the atmosphere. Sand is no conductor, so it is constantly emitting infrared rays to cool down. The more heat, the more it cools.

5. Homogenous literally means "same throughout". It is a mixture that appears to be of a constant chemical makeup, such as salt dissolved in water. Heterogeneous means "made of different materials". An example of a heterogeneous mixture could be oil in water (the water is more dense, the oil floats on top).

Answer 2

1．the hydrogen-bonds have a little to do with it. When water freezes and becomes ice, they form bonds between the molecules which causes some space to form, making the ice crystal less dense than other liquids formed into solid states.
2. In a saucer, the area of tea exposed to cool air is larger than in a cup, so naturally the liquid itself cools faster, enabling us to drink it easier.
3. Heat has a tendency to go from warm to cold.(?) Water by itself never becomes warm. You have to have somekind of energy force to do that, and otherwise, it would just get cooler till it reaches a certain point (depending on surrounding temperature).

I hope the top three helped. At least thats what we learn here in Japan (I think/haha).

Answer 3

Chemistry is truly no longer all that puzzling. after all, even I managed to benefit it. one ingredient to save in thoughts (heavily): plus attracts minus. Reactions ensue at the same time as oppositely charged debris come jointly. That, as an party, is the reason that alkanes are so little reactive: tehere is ono center of constructive or detrimental fee on them that is also why halogenoalkanes are so reactive: there's a partial constructive fee on the C and a partial detrimental fee on the halogen. wish this permits (somewhat)

Answer 4

answr for first three is liquids have a larger surface area deserts are cool in the night because of temp diffrences homgenus mixtures are when the substances mix easily and become one heterogenous mixtures the substances do not mix readily

Answer 5

saucer is wider dan d cup.....

Answer 6

Sorry sir.,.,.,.,.,.,.,.,.,.,.
If it could be math then i'll try.,,.,.,.