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"Water" Water and Air PPT Courseware 6
Which bag is the water in?
1. How can we identify them without opening the bag? Tell me how you identified it.
2. If there are still unidentified substances, how can we identify them? Tell me how you identified it.
friendly reminder:
1. Learn to cooperate, learn to listen, move in an orderly manner, have a low voice, fast speed and light movements.
2. Learn to use experimental supplies and do not let experimental supplies pollute the environment.
3. Develop good hygiene habits.
Substances are divided into three categories
Liquid: Like water, vinegar, milk...things that have no fixed shape are called liquids.
Solid: Like stone, wood, leaves... solids with fixed shapes.
Gas: Like air...something that also has no fixed shape is called a gas.
1. Fill in the blanks.
1. Water is a liquid without ( ), ( ), ( ).
2. Water is an important substance. It exists in ( ), ( ), ( ), and ( ). (Flexible question type)
3. Water has three states: solid ( ), liquid ( ), and gas ( ).
4. Objects can be divided into three categories: ( ), ( ), and ( ). The difference between them is that solids have fixed ( ), while liquids and gases do not have fixed ( ).
5. An object that has no fixed shape and can flow like water is called ( ).
6. Water is the source of life. ( ), ( ) and ( ) are all inseparable from water.
2. Choice.
1. The substance below that is liquid is ( ).
A.Stone B.Milk C.Chopsticks D.Sand
2. Because about 70% of the earth’s surface is covered by water, it can be said that the earth is actually ( ).
A. Balloon B. Water ball C. Stone ball D. Fire ball
3. Which of the following is a solid ( ) and which is a gas ( ).
A.Vinegar B.Carbon dioxide C.Wood D.Oil
4. Liquid water begins to solidify into ice when it reaches ( ).
A.0℃ B.-1℃ C.100℃
3. Judgment.
1. Water has no fixed shape. ( )
2. Water is a white liquid. ( )
3. Water is a liquid, and there are many liquids around us. ( )
4. Kerosene and water are both liquids. ( )
5. Solids are hard. ( )
6. Only aquatic plants and aquatic animals need water. ( )
7. Water only exists in rivers, rivers and oceans. ( )
8. The water we use is very cheap or free, so we can use it as we like. ( )
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