"Quantities represented by element symbols" PPT courseware

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"Quantities represented by element symbols" PPT courseware

Part One: Relative Atomic Mass

International regulations: relative atomic mass is used to express the mass relationship of atoms.

Taking 1/12 of the atomic mass of carbon-12 as a standard, the value obtained by comparing the masses of other atoms with it is the relative atomic mass of the atom.

Can it be represented by a formula?

relative atomic mass of an atom

=actual mass of an atom/atomic mass of C-12×1/12

=Mass of a certain atom×12/Atomic mass of C-12

1. If the mass of C-12 is a and the mass of A atom is b, then the relative mass of A atom is _______

2. It is known that the relative mass of A atom is 16, and 1/12 of the mass of C-12 is 1.661×10-27 kg. Find the mass of A atom.

3. It is known that the relative atomic masses of iron and carbon are 56 and 12 respectively. Do iron and carbon with the same mass contain the same number of atoms? Please explain why.

Quantity represented by element symbol PPT, part 2 content: relative molecular mass

The sum of the relative atomic masses of the atoms in a molecule is the relative molecular mass of the molecule

Find the relative molecular mass of carbon dioxide

step:

1. Write the correct chemical formula

2. Find out the relative atomic mass of each element

3. Relative molecular mass = the sum of the relative atomic masses of each atom

Can you find the relative molecular mass of sulfuric acid?

Please calculate the relative molecular mass of urea

CO2

1. Represents carbon dioxide

2. Indicates that carbon dioxide is composed of two elements: carbon and oxygen.

3. Represents a carbon dioxide molecule

4. Indicates that a carbon dioxide molecule consists of one carbon atom and two oxygen atoms

5. Indicates that the relative molecular mass of carbon dioxide is 44

Quantities represented by element symbols PPT, Part 3 content: Classroom exercises

Exercise: Given that the chemical formula of ammonium sulfate is (NH4)2SO4, find

(1) Relative molecular mass of ammonium sulfate.

(2) Mass fraction of hydrogen element in ammonium sulfate

(3) The mass of nitrogen elements in 66 grams of ammonium sulfate

(4) How many grams of ammonium sulfate contain 28 grams of nitrogen?

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume is free to download, quantities represented by element symbols PPT download, .PPT format;

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"Quantities Represented by Element Symbols" PPT:

"Quantity Represented by Element Symbols" PPT Part One Content: Talk about the meaning of the following symbols C 1. Represents the carbon element 2. Represents a carbon atom 3. Represents the carbon substance CO2 1. Represents the carbon dioxide substance 2. Represents that carbon dioxide is composed of oxygen element and carbon Element composition 3. Table...

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Update Time: 2024-06-29

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