Physics problems in the second year of junior high school, the monthly exam is coming soon, everyone

1. Water vapor liquefaction and exothermy.

2 No, it is still 0 degrees Celsius (as long as the temperature of the ice-water mixture is 0 degrees Celsius, the water temperature will gradually increase when the ice melts into water).

3 C answer (because it's still an ice-water mixture).

4 A is wrong not to obey the law of conservation of energy (because the water freezes and has to be exothermic, so when the water in the cup freezes, it has to release heat on the ice-water mixture in the bucket to make the water in the bucket freeze because the water freezes and is heat-absorbing) I think you should be playing ((the water in the cup should freeze, the ice in the bucket will not melt)). BCD: The answer is all right, B should be the ice in the bucket starting to melt, your question is too wrong.

1. Liquefaction and exothermy.

2. No, yes.

3、c4、c

1: Water liquefaction releases heat.

2: It's not amorphous, it's not crystalline.

It is still 0 3:c The temperature of the ice-water mixture is definitely 0 4:a how can water melt.

Water vapor is exothermic, and the specific heat capacity of water is high, and the cost is low.

Liquefaction and vaporization do not need to be carried out at a certain temperature.

The temperature of the ice-water mixture is still 0 degrees Celsius.

c. The temperature of the ice-water mixture remains unchanged, and the endothermic temperature rises after purification into water.

c Since everyone's temperature is 0 degrees, there is no heat transfer, i.e. the amount of ice remains the same, and the total amount of water remains the same.

1. Liquefaction and exothermy.

2 No, gasification can be done at any temperature, liquefaction is watery vapor and cold Yes.

3 c 4 c

2.at room temperature ; It's still 0 degrees Celsius.

Liquefaction endothermy. It's 0 degrees Celsius. cc

1.The use of water vapor at higher temperatures in heating units is mainly due to water vapor (exothermic)2Are both liquefaction and vaporization carried out at a certain temperature? In a room with a temperature of 20 degrees Celsius, is the temperature of the ice-water mixture still 0 degrees Celsius? No.

3.Ice-water mixture in the process of heat absorption (d).

a.Ice warms up and turns into water, and the water temperature does not change bThe ice temperature does not change, and the water temperature increases.

c.The temperature of the ice-water mixture does not change dThe temperature of the ice-water mixture increases.

4.The following statement that water that has been placed at 0 degrees Celsius in a bucket with a mixture of ice water is incorrect (d).

a.The water in the ice should freeze, and the water in the bucket should not melt.

b.The water in the bucket begins to melt.

c.The water in the cup remains in its original state and temperature.

d.The water in the cup partially froze, and the ice in the bucket partially melted.

1.Water vapor liquefaction will exothermic.

2.It's still 0 degrees Celsius.

It cannot absorb heat and remains in its original state.

The temperature of the ice-water mixture will remain unchanged at 0 degrees Celsius, and the temperature will only increase from 0 degrees Celsius when it is known that the water will be fully transformed.

1 Water vapor has a lot of heat.

2 Liquefaction and vaporization are both carried out at room temperature, but there is a noticeable and non-noticeable difference, yes, but this ice-water mixture is definitely going to melt slowly, and then it will not.

3 c Remember that the ice-water mixture is 0 degrees to remember.

4 A b d does not exist the process of endothermic vs exothermic because the temperature is as high.