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Authoritative PPT Summary
"Elements Composing Matter" PPT Courseware
Part 1: Introduction to elements
What is the definition of element?
Atoms of the same type with the same nuclear charge (or number of protons) are collectively called elements.
1. The world is made of matter. From a microscopic perspective, what is matter made of?
Composed of particles such as molecules, atoms, and ions
2. From a macro analysis, what is matter composed of?
element
Elements that make up matter PPT, part 2: the difference and connection between elements and atoms
Do you know how to do it?
How to describe the composition and composition of water?
Macro
Water is composed of hydrogen and oxygen elements.
Water is composed of two hydrogen elements and one oxygen element
microscopic
Water is made up of (many, many) water molecules.
Each water molecule is made up of two hydrogen atoms and one oxygen atom.
A water molecule is made up of two hydrogen elements and one oxygen element.
Elements that make up matter PPT, part 3 content: Types of elements: more than 110 types in total
Element classification
Metal elements: use "钅" as the radical (except mercury)
non-metallic elements
Solid: use "stone" as the radical
Liquid: use "氵" as the radical
Gas: use "qi" as the radical
Pure substances composed of the same elements are called elements.
Pure substances composed of different elements are called compounds.
Elements that make up matter PPT, Part 4 content: Distribution of elements
1. Distribution of elements in the earth’s crust: oxygen silicon aluminum iron calcium sodium potassium magnesium
2. Distribution of elements in the human body: oxygen carbon hydrogen (O C H)
Effects of some elements on health
Calcium deficiency - osteoporosis, deformity, rickets;
Zinc deficiency--children's development will be stunted, mental retardation, and in severe cases, dwarfism;
Cobalt and iron deficiency - anemia;
Iodine deficiency - thyroid disease.
Excess calcium - cataracts, arteriosclerosis
Selenium (Se) - trace amounts can prevent cancer, but excessive amounts can cause cancer.
Elements that make up matter PPT, Part 5: Practice
1. Among the following substances, those containing oxygen molecules are ( ), and those containing oxygen atoms in their molecules are ( ),
The elements containing oxygen are ( ). Those that belong to elements are ( ), those that belong to compounds are ( ),
The mixture is ( ).
A． Water B. Oxygen C. Air D. Carbon dioxide E. Hydrogen F. Sodium chloride (salt) H. Copper
2. After analysis, it is found that a certain substance contains only one element, then the substance - ( )
A. It must be a simple substance B. It must be a pure substance
C. It cannot be a mixture D. It cannot be a compound.
3. The figure below is a schematic diagram representing gas molecules. In the figure, "____" and "____" respectively represent atoms with two different proton numbers.
(1) ______ represents a mixture (2) ______ represents an element.
(2) The compound is represented by _____ (4) The pure substance is represented by ______.
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"Elements Composing Matter" PPT download:
"Elements Composing Matter" PPT Download Part One: Review Introduction 1. The world is composed of matter. From a microscopic perspective, what is matter made of? It is composed of molecules, atoms, ions and other particles. 2. What is the definition of an element? Have the same nuclear charge..
"Elements Composing Matter" PPT:
"Elements Composing Matter" PPT Part One Content: New lesson introduction to compare the molecular structures of carbon monoxide and carbon dioxide. Conclusion: (1) Both molecules contain carbon atoms and oxygen atoms; (2) The number of oxygen atoms contained in a molecule is different; (3) Both are composed of two elements: carbon and oxygen..
"Elements Composing Matter" PPT courseware on the composition of matter:
"Elements Composing Matter" The composition of matter PPT courseware Broadening horizons: elements and atomic numbers 1. In chemistry, atoms of the same type with the same nuclear charge (i.e., the number of protons) are collectively called elements. For example: all atoms with a nuclear charge of 1 are collectively called hydrogen elements; all...