"Law of Conservation of Mass" Chemical Changes and Their Representation PPT Courseware 3

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"Law of Conservation of Mass" Chemical Changes and Their Representation PPT Courseware 3

Experiment 1

Balance the scale before and after the reaction

Experiment 2

The balance is unbalanced after the reaction

Solve the problem

How to improve Experiment 3 so that the balance remains balanced after the reaction?

There is gas participation and gas generation reaction. The mass conservation experiment should be carried out in ( ) container!

Class exercises:

1. The following items must remain unchanged in chemical reactions ( ④ ⑤ ⑥ )

①Type of substance ②Type of molecule ③Number of molecules

④Type of atom ⑤Number of atoms ⑥Atomic mass

2. A certain substance X + O2→CO2 + H2O

The elements that X must contain are ( )

A. C and H elements

B． C,O elements

C. O, H elements

D． C, H, O elements

3. A pure substance decomposes into ammonia (NH3), carbon dioxide and water when heated slightly. Draw conclusions based on experimental facts ( )

A. It is composed of four elements B. it is an oxide

C. It has water D. it's very stable

4. Some people say that he can turn limestone into gold. Please use your chemical knowledge to explain why limestone (main component: CaCO3) cannot be turned into gold.

Answer: Limestone is composed of calcium, carbon, and oxygen elements, and gold is composed of gold elements.

The types of elements remain unchanged before and after the chemical reaction, so it is impossible for limestone to turn into gold.

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Update Time: 2024-10-20

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

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