"Metal Materials" PPT (first lesson)

Description

"Metal Materials" PPT (first lesson)

Part One: Teaching Objectives

1. Understand the physical characteristics of metals and the properties and applications of common metals;

2. Be able to distinguish between metals and non-metals.

Metal materials PPT, part 2 content: step-by-step learning

1. Development history of metal materials

During the Shang Dynasty, people began to use bronze vessels

During the Spring and Autumn Period, iron tools began to be used

The large-scale use of aluminum began 100 years ago

2. Metals and non-metals

1. Appearance and properties of metal

Copper purple solid

Density 8.92×103 kg/m3, good electrical conductivity, ductility and thermal conductivity.

Aluminum silvery white solid

Density 2.7×103 kg/m3, light weight, ductility (aluminum foil), good electrical conductivity and thermal conductivity

Iron silvery white solid

The density is 7.8×103 kg/m3, and it is ferromagnetic. Pure iron is soft and hard when containing impurities.

gold golden yellow solid

Good ductility (gold foil) and good conductivity. Not easy to react with other substances (stable)

Mercury silvery white liquid

It expands easily with heat and shrinks with cold, and is toxic. The only liquid metal at room temperature.

2. Appearance and properties of non-metals

Sulfur yellow solid

It burns in the air and emits a light blue flame (bright blue-purple in oxygen), producing pungent smelling gas.

Carbon black solid

Carbon will generate CO when it is incompletely burned, and CO2 will be generated when it is completely burned.

Phosphorus red solid (red phosphorus)

Common types of phosphorus include red phosphorus and white phosphorus. The ignition point of white phosphorus is only 40°C.

Bromine reddish brown liquid

Melting point -7.2℃, the only liquid non-metallic substance at room temperature.

Metal Materials PPT, Part 3: Thoughts and Discussions

There is a simple substance. What methods can you use to distinguish whether it is a metal or a non-metal?

1. Place it under light and you can distinguish it according to the color and gloss.

2. Hold the element in hand and bake it next to the fire. It can be distinguished according to the thermal conductivity.

3. Hit the element hard with a hard object and it can be distinguished according to its malleability.

4. Pull the simple substance hard and it can be distinguished according to its ductility.

5. Conduct conductivity experiments and distinguish based on conductivity

Metal Materials PPT, Part 4: Classroom Exercises

1. Among the following daily necessities, which ones are made of metal materials ( )

A. Plastic bag B. Glass cup C. Iron pot D. Magnetic bowl

2. A metal that is liquid at room temperature is --- ( )

A, Hg B, Ag C, Mg D, Ni

3. Which of the following descriptions of the physical properties of copper is incorrect----( )

A. The density of copper is 8.9×103 kg/m3

B. Elemental copper has a silvery white metallic luster

C. Copper’s electrical conductivity is quite good, and its electrical conductivity among metals is second only to silver.

D. Copper has good thermal conductivity

4. The petroleum products stored in the tanker will generate static electricity after oscillating, so there is an iron chain mopping the floor at the rear of the tanker, which takes advantage of the _____ property of iron.

5. The upper part of the steel spatula used for cooking is often added with a wooden handle and a plastic handle. This shows that the properties of iron are --- ( )

A. Iron is a conductor of heat B. Iron is a conductor of electricity

C. Iron rusts easily in the air. D. Iron is not resistant to acid and alkali corrosion.

6. The World Health Organization defines aluminum as one of the food contaminants. The following applications of aluminum must be controlled---()

A. Use aluminum alloy doors and windows

B. Use aluminum alloy as aircraft material

C. Carbonated drink cans made of metal aluminum

D. Use metal aluminum wires

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Update Time: 2024-11-19

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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