"Utilization of Chemical Energy" Modern Life and Chemistry PPT Courseware 2

Description

"Utilization of Chemical Energy" Modern Life and Chemistry PPT Courseware 2

learning target

1. Understand the main energy sources used in today’s society;

2. Know that chemical energy can be converted into heat energy, electrical energy, etc., and understand the use of chemical energy.

1. Energy

Development of energy——①Firewood

Development of energy——②Coal

Development of energy - ③Thermal energy, water energy, solar energy, wind energy, nuclear energy

Main energy sources - fossil fuels

Fossil fuel resources are limited and will cause pollution to the natural environment. Therefore, clean and efficient new energy must be developed and utilized.

2. Utilization of chemical energy

When a chemical change occurs in a substance, it is often accompanied by a change in energy, which is chemical energy. Through chemical reactions, chemical energy can be converted into other energy, such as heat energy, electrical energy, etc.

1. Conversion of chemical energy into thermal energy

Combustion of coal, gasoline, diesel, natural gas, etc.

Disadvantages of Fossil Fuels:

(1) Non-renewable;

(2) Low energy conversion rate;

(3) Produce environmental pollution.

2. Conversion of chemical energy into electrical energy

Chemical battery: conversion of chemical energy into electrical energy

Primary battery: cannot be charged and used again, such as dry cell battery

Secondary battery: rechargeable and reusable, such as storage battery and lithium battery

Fuel cell: Chemical energy is directly converted into electrical energy, such as hydrogen-oxygen fuel cell

Hydrogen-oxygen fuel cell

(1) Composed of porous metal positive and negative electrodes and conductive liquid;

(2) Hydrogen enters the negative electrode and oxygen enters the positive electrode;

(3) The product after power generation is water;

(4) Spacecraft and other spacecraft have been used.

Classic examples

Knowledge point 1: Energy

1. Which of the following energy sources are “green” energy sources ( )

A. Natural gas b. coal

C． Petroleum D. solar energy

Knowledge point 2: Utilization of chemical energy

1. In the following energy development and utilization processes, chemical energy is converted into electrical energy ( )

A. Hydroelectric power b. wind power

C． Solar power generation D. Fuel cell power generation

Knowledge training

1. Human life requires energy. Among the following examples of energy conversion that are not produced by chemical changes are ( )

A. Light a campfire and bake food

B． Solar water heater boils water

C． Green plants convert solar energy into chemical energy

D． Coal burning to generate electricity

2. The heat required to maintain human life activities is mainly directly converted from what kind of energy ( )

A. Solar energy b. chemical energy

C． Kinetic energy D. Electric energy

3. At present, rural areas in my country still use a large amount of burning firewood to obtain energy. From the perspective of energy conversion, this is ( )

A. chemical energy converted into thermal energy

B． Convert solar energy into heat energy

C． chemical energy converted into kinetic energy

D． Convert solar energy into chemical energy

4. A fuel cell is a device that converts chemical energy into electrical energy. The cleanest fuel cell below is ( )

A. O2-CH4 fuel cell

B． O2—C2H5OH fuel cell

C． O2-H2 fuel cell

D． O2-CO fuel cell

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"Utilization of Chemical Energy" Modern Life and Chemistry PPT Courseware 3:

"Utilization of Chemical Energy" Modern Life and Chemistry PPT Courseware 3 Knowledge Review Knowledge Point 1 Energy 1. At present, the energy commonly used in society is mainly ________, in addition to ________, ________, _______ and _______, etc. Due to the exploitable ______..

"Utilization of Chemical Energy" Modern Life and Chemistry PPT Courseware:

"Utilization of Chemical Energy" Modern Life and Chemistry PPT Courseware New Knowledge Preview 1 Energy At present, the energy commonly used in society is mainly ________, in addition to ________, ________, _______ and _______, etc. Due to the exploitable ___________..

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Update Time: 2024-09-06

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 2 industry PPT template

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