"The Composition of Water" Water in Nature PPT Courseware 9

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"The Composition of Water" Water in Nature PPT Courseware 9

Thinking: What phenomena occurred during the experiment?

1. Bubbles appear on both electrodes.

2. The volume ratio of the positive electrode gas to the negative electrode gas is 1:2

Thinking: What gas is in the two test tubes?

Positive electrode: It is oxygen that can rekindle wooden sticks with sparks.

Negative electrode: The gas can burn, the flame is light blue, it is hydrogen.

discuss:

1. In the electrolysis experiment of water, are any new substances generated? What happened to the water?

Water----Hydrogen + Oxygen

2. Are there any changes in the types of elements involved in the reaction before and after the above change?

In chemical changes, the types of elements involved in the reaction remain unchanged

Exercise: Classify the following substances:

①Iron (Fe), ②Potassium permanganate (KMnO4),

③Hydrogen peroxide (H2O2), ④Water (H2O),

⑤Manganese dioxide (MnO2), ⑥Phosphorus (P),

⑦Potassium chlorate (KClO3)

1. The simple substance is ____________.

2. The compound is ____________.

3. The oxide is ____________.

summary:

1. Electrolysis of water:

1. Two electrodes produce bubbles; the positive electrode is oxygen and the negative electrode is hydrogen.

2. Water----Hydrogen + Oxygen

3. Water is composed of hydrogen and oxygen elements.

2. Substance classification:

1. Compounds: pure substances composed of different elements

2. Element: a pure substance composed of the same element

3. Oxide: A compound composed of two elements, one of which is oxygen.

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Update Time: 2024-11-20

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