How to improve the science innovation experiment in primary school

Tell you a simple science experiment.

Materials: candles, baking soda, white vinegar, cups (preferably transparent), glass lids (or others are fine, as long as the cup is covered).

Procedure: 1 Fill a cup with some white vinegar.

2Put baking soda in a cup.

3. This step is best done at the same time as the second step (two people, one puts soda, one person covers the lid), and the lid is pressed gently.

4. After a while, the vinegar will bubble up in white, and when it calms down, open the lid and pour the gas inside over the candle. (Do not pour out the vinegar).

5 Magical things happened ......The candle went out.

Principle: Quite simply, vinegar reacts chemically with baking soda to produce carbon dioxide. The fire is extinguished when the carbon dioxide is heavier (the fire is only burned in the presence of oxygen).

Experiment with materials commonly used in everyday life.

Hold the raw egg in your hand, hold it firmly, and see what happens?

Answer: Hold the unbroken raw egg in your hand. Good trembling Kai.

This question is simply divided into the following points:

1: Since the egg is subjected to force in all directions, the force on the entire egg surface is very small.

2: Due to the shape of the egg, it is an arc surface, and this structure makes it very compressive and tensile resistant. Because eggs are rounded.

The principle is similar to that of an arch bridge. The curved shape also increases the mechanical strength, just as some buildings use curved cavated roofs to resist earthquakes, such as the Sydney Opera House.

To add to that, if you apply force from the inside of the egg, the egg can easily break! That's how chicks come out.

I did an experiment with the ups and downs of an object: put four oranges in a sink. (Four of them are bought at the same time and are of the same size).

Phenomenon: Three float up, bend and one sink.

Conclusion: There is air in the three buried void states, and there is no air in the sinking ones.

Continue the experiment: cut the sinking one and put it in the sink.

Phenomenon: Both pieces are sinking.

Conclusion: The sinking orange, the tissue begins to deteriorate. (There is no floating freshness) reputation skin.

Gas Lifts.

However, if I tell you a simple way, the exhaled breath can lift a weight of 10 kilograms, and you can do it yourself, believe it or not, try it yourself.

Preparation: Place a sturdy rectangular paper bag or a plastic bag on the table, the size of which can fit two thick books. Put a whole bunch of books on top of it – take the thickest, heaviest book you can find. At this point, you can start blowing into the bag.

Note: The blow opening should be small, so that it is easier to blow and does not require a lot of effort.

Blow slower and more evenly. You'll notice that the air you blow out, when you get into the bag, slowly puffs up as the bag slowly expands, and you can easily lift up a lot of books on it. At this point, you'll get excited – the breath I exhale has such a magical effect!

In fact, as long as the size of the paper or plastic bag is 10 cm to 20 cm (200 square centimeters), you only need to blow a little more air than one atmosphere to make the bag get a force of 20 kg. Therefore, it is easy to lift a weight of 10 kg.

You can do an oxygen experiment, first collect a full bottle of oxygen in a plastic bottle, and then put in a substance that can consume oxygen, and you can see the bottle automatically shrink in a state of uncompressed state. This is like magic for children, I believe children should like it! This is the chemistry knowledge of the third year of junior high school, and I have forgotten a little about the specific oxyme-consuming substance.

The reason why science experiment teaching in primary schools is not valued is that examination-oriented education is the mainstay, and quality education is not paid attention to, so as to cultivate students' innovation ability.

More hands-on operation, so that students know how to apply more! Innovation is not a change of teaching, good teaching is to let students feel the existence of what they are learning and its application in society!

I did an experiment with the ups and downs of an object: I put four oranges in a sink. (Four at the same time bought the size of the buried state is the same).

Phenomenon: The skin of the three reputations floats and sinks.

Conclusion: There is air in the three, and there is no air in the sinking one.

Continue the experiment: cut the sinking one and put it in the sink.

Phenomenon: Both pieces are sinking.

Conclusion: The sinking orange, the tissue begins to deteriorate. (there is no freshness that floats).

Innovative Experiment Title: Weathering of Rocks. Because experiments with pebbles are difficult to complete in one lesson, you can change to experiments with smashed small bricks.

Equipment: small bricks, tweezers, beakers, water, alcohol lamps, matches. The small bricks should be baked on the outer flame of the wine lamp for 3 minutes, and then put them in cold water, repeatedly, and the small bricks will break in one class. Satisfied.