"The Composition of Water" Water in Nature PPT Courseware 6

Description

"The Composition of Water" Water in Nature PPT Courseware 6

What is water?

Hydrogen combustion test

It is a colorless and odorless transparent liquid under normal temperature and pressure.

Boiling point: 100℃

Freezing point: 0℃

Density: 1kg/m3

1. Hydrogen - H2

physical properties

gas

Colorless, odorless

Hardly soluble in water

Less dense than air

chemical properties

When burning in air: light blue flame

When mixed with a certain amount of air or oxygen: it will explode when exposed to open flames

2. Inspection of hydrogen H2

When igniting hydrogen:

A sharp crackling sound indicates impure gas;

A low sound means the gas is pure.

3. Combustion of hydrogen H2

Literal expression of the reaction: Hydrogen + Oxygen — → Water

Q1: What kind of basic chemical reaction does hydrogen combustion belong to?

Q2: Will new substances be generated when hydrogen is burned?

Q3: What are the products of hydrogen combustion?

2. Water - H2O

Electrolysis experiment of water H2O

Device:

DC power supply

Inert electrode

Hoffman electrolyzer

water

Sulfuric acid or sodium hydroxide solution

Experiment summary

(1) In the experiment of electrolyzing water, water underwent a decomposition reaction and decomposed into two substances: hydrogen and oxygen.

(2) The gas produced by the positive electrode can re-ignite the wood strips with sparks, which is oxygen; the gas produced by the negative electrode can burn and produce a light blue flame, which is hydrogen.

(3) The volume ratio of gas generated by the positive and negative electrodes, that is, VO2:VH2=1:2.

water ≠ element

Water is composed of hydrogen and oxygen elements

A water molecule is composed of 2 hydrogen atoms and 1 oxygen atom.

3. Compounds and elements

pure substance compound oxide

Simple substance

mixture

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Update Time: 2024-08-30

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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