"Formation of Solution" Solution PPT Download (Lesson 2)

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"Formation of Solution" Solution PPT Download (Lesson 2), 16 pages in total.

New course introduction

Demonstrate an interesting experiment: Use a melted candle to stick a small piece of glass to the bottom of the beaker. After the candle cools, pour half a cup of water into the beaker, add an appropriate amount of NaOH solid, stir continuously, and observe the phenomenon.

Discussion and exchange: Why did the glass piece at the bottom of the beaker fall off? Guess the possible reasons.

New lesson explanation

Activities and Explorations (1): Endothermic or exothermic phenomena during dissolution

Student Activities:

1. Take three beakers, add 100mL of water to each, and measure the temperature of the water with a thermometer.

2. Add 3 spoons each of NaCl, NH4NO3, and NaOH into the above three beakers, stir until the solids are completely dissolved, and measure the temperature of the solution.

3. Calculate the change in liquid temperature before and after dissolution and fill in the table below.

The essence of the temperature change when a solute dissolves in water:

Diffusion process – absorbing heat;

Hydration Process – Release of Heat.

When Q absorbs > Q releases: the temperature of the aqueous solution decreases;

When Q absorbs < Q releases: the temperature of the aqueous solution increases;

When Q absorbs = Q releases: the temperature of the aqueous solution remains unchanged.

Summarize:

1. Emulsion: A mixture of small droplets dispersed into a liquid is called an emulsion.

2. Emulsification phenomenon: It can make vegetable oil disperse into countless small droplets in water without gathering into large oil beads, so that oil and water are no longer stratified, and the stability of the emulsion formed is enhanced. This phenomenon is called emulsification phenomenon.

Class summary

1. Endothermic or exothermic phenomena during dissolution

When Q absorbs > Q releases: the temperature of the aqueous solution decreases and heat is absorbed;

When Q absorbs < Q releases: the temperature of the aqueous solution increases and heat is released;

When Q absorbs = Q releases: the temperature of the aqueous solution remains unchanged and neither absorbs nor releases heat.

2. Emulsions and emulsification phenomena

(1) Emulsion: a mixture formed by small droplets dispersed into a liquid.

(2) Emulsification phenomenon: Emulsification will enhance the stability of the emulsion and make it less likely to stratify.

Class exercises

1. When one of the following substances is added to a beaker containing water to form a solution, the temperature drops. This substance may be ( )

A. Sodium chloride b. Ammonium nitrate

C. Sodium hydroxide D. sucrose

2. There is a canned beverage commonly known as "shake ice" on the market. A solid substance and water are placed in the interlayer of the beverage can. Shake them before drinking, and the temperature of the beverage in the can will decrease. This solid substance may be ( )

A. Quicklime B. caustic soda

C. Table saltD. Ammonium nitrate

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Update Time: 2024-09-30

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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