"Physical Properties and Chemical Properties" PPT

"Physical Properties and Chemical Properties" PPT

Part 1: Reading materials and answering questions:

What are the changes that describe the changes in natural gas?

Natural gas is the world's third largest energy source after coal and oil. It mainly exists in oil field gas, gas field gas, coal bed methane, mud volcano gas and biologically generated gas, and a small amount also comes from coal seams. The density is about 0.65g/L, lighter than air, colorless and odorless. It can become liquid under conditions of compression and cooling. It can burn because its main component is methane. When burned, it produces a bright light blue flame and produces carbon dioxide, water and other substances.

Is there a difference between these two changes?

Can become liquid under conditions of compression and cooling

physical changes

Combustion produces a bright light blue flame and produces substances such as carbon dioxide and water.

Chemical changes

Physical and chemical properties PPT, part 2 content: Examiner:

Group activities:

The reaction between sodium hydroxide and ferric chloride

Reaction of sodium hydroxide and colorless phenolphthalein

Please observe and analyze carefully:

The reaction between calcium carbonate and dilute hydrochloric acid

Group discussion: Is the change process described in the following poem a physical change or a chemical change:

The spring silkworm's silk will not be exhausted until it dies, and the candle's tears will not dry until it turns to ashes.

(Chemical changes are often accompanied by physical changes, such as luminescence, heat release, color change, etc.)

Physical properties and chemical properties PPT, the third part of the content: Summary:

1. Physical changes and chemical changes

1. Physical changes?

When matter changes, no new matter is produced. This change is called physical change.

2. Chemical changes?

The substance involved in the change becomes another new substance. This change is called a chemical change.

3. The fundamental difference between the two: is there any new substance generated during the change?

Connection: Chemical changes are often accompanied by physical changes, such as luminescence, heat release, color change and other phenomena. )

2. Physical and chemical properties

1. Physical properties: Properties that can be expressed without chemical changes.

Color, state, odor, melting point, boiling point, hardness, density

Solubility, ductility, electrical conductivity, thermal conductivity, etc.

2. Chemical properties Properties that are only expressed in chemical changes.

Flammability, acidity, alkali, corrosiveness, etc.

3. The essential difference between physical properties and chemical properties: whether they are manifested in chemical changes.

Physical properties and chemical properties PPT, part 4 content: exercises:

Classify the following statements:

A. Various furniture made from wood B. Ammonia has a pungent smell

C. Alcohol evaporates D. Kerosene burning

E. Magnesium oxide is a white powder F. Iron will rust in humid air

G. Kerosene can burn H. Alcohol is volatile

material:

Chlorine is a yellow-green gas under normal temperature and pressure. It can be liquefied into golden liquid chlorine after compression. Its density is 3.170g/L, which is denser than air. It is often used for tap water disinfection and manufacturing chemical products. It is a toxic gas that mainly invades the human body through the respiratory tract and dissolves in the water contained in the mucosa to generate hypochlorous acid and hydrochloric acid, causing harmful effects on the upper respiratory tract mucosa. The maximum allowed chlorine content in 1L of air is 0.001 mg. Exceeding this amount will cause human poisoning.

1) Please point out the sentence that describes the change of chlorine gas, and tell whether it is a physical change or a chemical change?

2) Please point out the sentence that describes the properties of chlorine, and tell whether it is a physical property or a chemical property?

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"Physical Properties and Chemical Properties" PPT download:

"Physical Properties and Chemical Properties" PPT Download Part One Content: Class Questions Question: There are two bottles of gas, one of which is oxygen (O2) and one of which is carbon dioxide (CO2). Is there any way you can distinguish them? (The more methods, the better) Oxygen (O2..

"Physical Properties and Chemical Properties" PPT courseware:

"Physical Properties and Chemical Properties" PPT courseware Part One: Story Introduction What did you see with Mr. Sleepwalker? Which of these substances have changed and how? Please record it on the activity sheet. Mr. Peter lights up the heart-shaped lanterns to celebrate his wife's birthday. Too bad...