"Specific Heat of Matter" PPT

Description

"Specific Heat of Matter" PPT

Part One: Thoughts and Activities

Thinking: When a small beaker containing hot water is placed into a large beaker containing cold water, what will happen to the temperature of the two glasses of water?

A large number of experiments have shown that when heat transfer occurs between two objects with different temperatures, heat will be transferred from the high-temperature object to the low-temperature object. High-temperature objects release heat and the temperature decreases; low-temperature objects absorb heat and the temperature increases.

Activity

heat transfer

Heat travels from an object with a higher temperature to an object with a lower temperature.

High-temperature objects: heat is released and the temperature decreases.

Low-temperature objects: absorb heat and increase their temperature.

Specific heat of matter PPT, part 2 content: Experience in life:

1. When a pot of 20 ℃ water is heated to 50 ℃ or heated to 100 ℃, which time absorbs more heat?

It takes more heat to heat a pot at 20°C to 100°C than to heat it to 50°C

The amount of heat absorbed by the same substance of equal mass is related to the increase in temperature. The more the temperature rises, the more heat is absorbed. On the contrary, the more the temperature decreases, the more heat is released

2. Boil a pot of water and a half pot of water (100 degrees Celsius). Which one absorbs more heat?

It takes more heat to boil a kettle of water than to boil half a kettle of water

When the same kind of object rises to a certain temperature, the heat absorbed is related to its mass. The greater the mass, the more heat it absorbs. On the contrary, when an object lowers its temperature by a certain amount, the greater its mass, the more heat it emits.

in conclusion:

For the same substance, the heat absorbed is related to the mass of the object and the rising temperature.

Specific heat of matter PPT, part 3 content: thinking and discussion

After mixing 10°C cold water and 90°C hot water, why is the temperature of the water higher than 10°C and lower than 90°C?

Some people think that after mixing 90℃ hot water and 10℃ cold water, the water temperature must be 50℃, right? Why?

question

For different substances, when the object's mass and elevated temperature are the same, is the amount of heat absorbed equal?

For example, if 100 grams of sand and 100 grams of water rise by 20 degrees Celsius, will they absorb the same amount of heat?

Specific heat of matter PPT, Part 4 content: Life·Physics·Society

The specific heat capacity of water is large. Under certain conditions of mass,

When water rises to the same temperature, it absorbs more heat, so using water as a coolant has a better effect.

The specific heat capacity of water is large. Under certain conditions of mass,

When water lowers to the same temperature, it releases more heat, and the heating effect is better with hot water.

1. Use cold water to cool objects (coolant)

2. Hot water heating?

3. Regulate climate effects

Because water has a large specific heat capacity,

During the day, after a certain amount of heat it absorbs, the temperature of the water does not rise much;

At night, after it releases a certain amount of heat, the temperature of the water does not drop much.

Specific heat of matter PPT, Part 5 content: Class summary

1. The amount of heat absorbed (or released) by an object is related to the mass of the object, the elevated temperature of the object, and the type of substance (specific heat of the substance)

2. Specific heat is a characteristic of matter

Different substances have different specific heats

3. The essence of specific heat capacity

(1) Reflects the ability of a substance to absorb and release heat;

The greater the specific heat capacity, the stronger the ability to absorb or release heat.

(2) The sensitivity of a substance to hot and cold reactions;

The smaller the specific heat capacity, the more sensitive it is to heat and cold.

Specific heat of matter PPT, Part 6: Feedback exercises

1. When water and dry sand with equal masses absorb equal amounts of heat, the temperature will increase ______. If the temperature is increased by the same amount, the heat absorbed will _______. This shows that the heat absorption capabilities of different substances with the same mass are _______ .In order to describe this property of matter, the physical quantity _______ was introduced in physics.

2. Regarding the specific heat capacity of substances, which of the following statements is correct ( )

A. The specific heat capacity is related to the mass of the object. The greater the mass, the smaller the specific heat capacity.

B. Specific heat capacity is related to the temperature of the object. The higher the temperature, the greater the specific heat capacity.

C. Specific heat capacity is related to the heat absorbed or released by an object

D. Specific heat capacity is a characteristic of the substance itself and has nothing to do with the temperature or mass of the object.

3. Regarding specific heat, which of the following statements is correct ( )

A. The specific heat capacity of an object is related to temperature

B. The specific heat capacity of an object is related to the heat absorbed and released by the object

C. The specific heat capacity of an object is a characteristic of the substance itself

D. The greater the mass of an object, the greater its specific heat capacity.

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Update Time: 2024-10-04

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