"Crystals under a Magnifying Glass" Micro World PPT Teaching Courseware

"Crystals under a Magnifying Glass" Micro World PPT Teaching Courseware

Part One: Exploring New Knowledge

(1) Use a magnifying glass to observe beautiful crystals

Salt crystals under a magnifying glass Sugar crystals under a magnifying glass

They are all cubic

MSG crystals under a magnifying glass Alkaline crystals under a magnifying glass

Particles of salt, sugar, alkaline noodles, and MSG are all solids with regular geometric shapes. People call such solid substances crystals.

crystals in nature

Many rocks are made of collections of mineral crystals. This is the crystal of feldspar, mica, quartz and other minerals in granite under a microscope.

Most solid substances in nature are crystals or consist of crystals. Crystals come in many shapes, but they are all regular. Some are cubes, some are like pyramids, some are like clusters of needles... Some crystals are larger and visible to the naked eye, while some are smaller and can only be seen under a magnifying glass or microscope.

Because the crystals of various substances have basically the same properties, crystals are the basis for identifying minerals.

(2) Making crystals

Some crystals in nature are born from solutions, such as salt crystals obtained by evaporating seawater. Some crystals are formed under certain pressure and temperature, such as mineral crystals formed after volcanic eruptions and magma cool down.

Production Method

Reduce moisture: refers to air-drying a certain solution, causing the water to evaporate and allowing the substance to re-precipitate;

Lowering the temperature: First heating a solution of a certain substance to make it a saturated solution, and then cooling it to re-precipitate the substance.

Discovery: The first batch of crystals will first appear at the bottom of the glass. Filter out the remaining crystals in the solution. Continue to immerse the crystals hanging on the thin wire into the filtered solution. The crystals will grow slowly. If you continue to pour the salt solution into the cup, the growth of the crystals will continue for weeks or even months.

Crystal PPT under a magnifying glass, part 2: expansion and extension

Crystals have three characteristics:

1. The crystal has a neat and regular geometric shape; 2. The crystal has a fixed melting point; 3. The crystal has anisotropic characteristics.

The table salt we eat is the crystallization of sodium chloride; MSG is the crystallization of sodium glutamate; the ice flakes on the window glass and the snowflakes falling from the sky in winter are the crystallization of water. It can be said like this: "What sparkles is not necessarily a crystal, and what is simple and cannot sparkle is not necessarily a crystal."

Crystal PPT under a magnifying glass, part three: summary of this lesson

A crystal is a structure of many solid substances. Some crystals in nature are born from solutions, such as salt crystals obtained by evaporation of sea water, and some crystals are formed under a certain pressure and temperature, such as mineral crystals formed after volcanic eruptions and magma cools. Methods for making crystals include reducing moisture and lowering temperature.

Crystal PPT under a magnifying glass, Part 4: Classroom exercises

1. Fill in the blanks

1. Crystals are many solid substances ( ).

2. Salt is the crystal of ( ); MSG is ( )

The crystals of ( ); the ice flowers on the window glass and the snowflakes floating in the sky in winter are ( ) crystals.

2. Judgment questions

1. The shape of salt crystals is clusters. ( )

2. Crystal morphology is the basis for identifying minerals. ( )

3. There are three crystals of quartz, feldspar and mica in granite. ( )

4. Many rocks are composed of mineral crystals. ( )

Crystal PPT under a magnifying glass, Part 5: Homework

Make a large white sugar crystal.

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