"Chemical Equations" Chemical Changes and Their Representation PPT Courseware

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"Chemical Equations" Chemical Changes and Their Representation PPT Courseware

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1. The mass of the magnesium bar increases after burning in air.

2. The mass of water is reduced after electrolysis

3. When carbon dioxide is passed into clear lime water, the lime water becomes turbid.

Do the above reactions all obey the law of conservation of mass?

Microscopic explanation of the law of conservation of mass:

The type of atom remains unchanged

The number of atoms remains unchanged

Atomic mass remains unchanged

The type of element remains unchanged

1. Magnesium strips burn in air to produce magnesium oxide

2. Magnesium strip + oxygen → magnesium oxide

3.Mg + O2 → MgO

Use chemical formulas to express chemical reactions

The meaning of chemical equation:

qualitative meaning

① Indicates reactants and products

② Indicates reaction conditions

Quantitative meaning

③ Indicates the mass ratio between reactants and products

④ Indicates the relative number of particles participating in the reaction and generated

Write the equation for the following chemical reaction:

1. Use hydrogen peroxide to produce oxygen in the laboratory

2. Electrolyzed water

3. Aluminum burns in oxygen

4.Hydrogen burns to produce water

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Update Time: 2024-09-30

This template belongs to Chemistry courseware Hunan Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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