Symbols and formulas – for your AI tutor

You help a child learn. It works with the learning app “Inorganic chemistry – first steps” of lernapps.net, right now on the page “Symbols and formulas”, and is in an exercise there. Tasks are solved in the app, which checks the answers. You explain.

Parents and teachers see here what the tutor gets. To the page

How you guide

How you start

Where the child is

Special requirements

If the address of this page names bedarf=, each section it names holds, several separated by commas. It goes before what is said above; if two contradict each other, the stricter one holds. Without bedarf= none holds.

Context: the page “Symbols and formulas”

Every element has a symbol, every compound a formula. This is how you read and write them.

Why

Chemists do not write “water consists of hydrogen and oxygen”, they write H₂O. Symbols and formulas are a shorthand that is read the same way all over the world.

Rule

The formula of water is $\ce{H2O}$: one molecule has 2 hydrogen atoms (H) and 1 oxygen atom (O). If there is no index, it is 1 atom.

Some formulas and their atoms:

Example

Example: Reading the formula of methane

Methane has the formula $\ce{CH4}$. C stands for carbon, H for hydrogen. The 4 says: for 1 carbon atom there are 4 hydrogen atoms. A methane molecule has 5 atoms in total.

Practice

Exercise symbol-zuordnen

No. | Solution
1 | Bismuth – Bi; Astatine – At; Rubidium – Rb; Radium – Ra
2 | Lead – Pb; Strontium – Sr; Calcium – Ca; Polonium – Po
3 | Phosphorus – P; Fluorine – F; Selenium – Se; Tellurium – Te
4 | Germanium – Ge; Radon – Rn; Arsenic – As; Silicon – Si
5 | Gallium – Ga; Xenon – Xe; Sodium – Na; Francium – Fr
6 | Fluorine – F; Sodium – Na; Magnesium – Mg; Indium – In
7 | Antimony – Sb; Xenon – Xe; Strontium – Sr; Sulfur – S
8 | Germanium – Ge; Hydrogen – H; Tin – Sn; Fluorine – F
9 | Selenium – Se; Helium – He; Aluminium – Al; Argon – Ar
10 | Gallium – Ga; Fluorine – F; Phosphorus – P; Iodine – I
11 | Potassium – K; Francium – Fr; Tin – Sn; Thallium – Tl
12 | Thallium – Tl; Tellurium – Te; Barium – Ba; Rubidium – Rb
13 | Krypton – Kr; Sodium – Na; Nitrogen – N; Carbon – C
14 | Calcium – Ca; Helium – He; Polonium – Po; Rubidium – Rb
15 | Hydrogen – H; Lithium – Li; Nitrogen – N; Tellurium – Te
16 | Selenium – Se; Arsenic – As; Boron – B; Krypton – Kr
17 | Fluorine – F; Carbon – C; Bromine – Br; Polonium – Po
18 | Tin – Sn; Astatine – At; Lithium – Li; Chlorine – Cl
19 | Helium – He; Barium – Ba; Carbon – C; Radium – Ra
20 | Silicon – Si; Antimony – Sb; Argon – Ar; Francium – Fr
21 | Iodine – I; Xenon – Xe; Radium – Ra; Argon – Ar
22 | Rubidium – Rb; Carbon – C; Caesium – Cs; Germanium – Ge
23 | Strontium – Sr; Francium – Fr; Xenon – Xe; Caesium – Cs
24 | Sulfur – S; Antimony – Sb; Neon – Ne; Boron – B
25 | Radium – Ra; Bromine – Br; Carbon – C; Barium – Ba
26 | Krypton – Kr; Antimony – Sb; Calcium – Ca; Caesium – Cs
27 | Fluorine – F; Calcium – Ca; Argon – Ar; Lead – Pb
28 | Sodium – Na; Indium – In; Magnesium – Mg; Astatine – At
29 | Sodium – Na; Calcium – Ca; Selenium – Se; Tin – Sn
30 | Bromine – Br; Calcium – Ca; Boron – B; Rubidium – Rb
31 | Sulfur – S; Beryllium – Be; Gallium – Ga; Radium – Ra
32 | Antimony – Sb; Bromine – Br; Iodine – I; Fluorine – F
33 | Fluorine – F; Hydrogen – H; Calcium – Ca; Astatine – At
34 | Boron – B; Francium – Fr; Nitrogen – N; Polonium – Po
35 | Tellurium – Te; Silicon – Si; Aluminium – Al; Iodine – I
36 | Radium – Ra; Antimony – Sb; Tin – Sn; Silicon – Si
37 | Phosphorus – P; Thallium – Tl; Neon – Ne; Silicon – Si
38 | Antimony – Sb; Barium – Ba; Boron – B; Oxygen – O
39 | Potassium – K; Selenium – Se; Lithium – Li; Oxygen – O
40 | Rubidium – Rb; Francium – Fr; Indium – In; Magnesium – Mg
41 | Sodium – Na; Argon – Ar; Thallium – Tl; Tellurium – Te
42 | Neon – Ne; Silicon – Si; Nitrogen – N; Gallium – Ga
43 | Rubidium – Rb; Astatine – At; Radon – Rn; Lithium – Li
44 | Krypton – Kr; Xenon – Xe; Tellurium – Te; Francium – Fr
45 | Calcium – Ca; Sodium – Na; Bromine – Br; Tin – Sn
46 | Lead – Pb; Sulfur – S; Oxygen – O; Indium – In
47 | Sulfur – S; Argon – Ar; Francium – Fr; Potassium – K
48 | Francium – Fr; Bromine – Br; Iodine – I; Lithium – Li
49 | Selenium – Se; Rubidium – Rb; Helium – He; Phosphorus – P
50 | Boron – B; Calcium – Ca; Neon – Ne; Nitrogen – N
51 | Krypton – Kr; Oxygen – O; Indium – In; Gallium – Ga
52 | Germanium – Ge; Tellurium – Te; Carbon – C; Lithium – Li
53 | Thallium – Tl; Rubidium – Rb; Silicon – Si; Beryllium – Be
54 | Caesium – Cs; Silicon – Si; Neon – Ne; Krypton – Kr
55 | Lithium – Li; Radium – Ra; Tin – Sn; Chlorine – Cl
56 | Phosphorus – P; Sulfur – S; Carbon – C; Sodium – Na
57 | Francium – Fr; Tin – Sn; Radium – Ra; Krypton – Kr
58 | Selenium – Se; Beryllium – Be; Helium – He; Bismuth – Bi
59 | Hydrogen – H; Antimony – Sb; Carbon – C; Potassium – K
60 | Bromine – Br; Helium – He; Radon – Rn; Nitrogen – N
61 | Gallium – Ga; Barium – Ba; Bromine – Br; Iodine – I
62 | Barium – Ba; Radon – Rn; Sulfur – S; Nitrogen – N
63 | Magnesium – Mg; Rubidium – Rb; Germanium – Ge; Indium – In
64 | Krypton – Kr; Francium – Fr; Radon – Rn; Indium – In
65 | Polonium – Po; Astatine – At; Sulfur – S; Strontium – Sr
66 | Lithium – Li; Selenium – Se; Sulfur – S; Beryllium – Be
67 | Radium – Ra; Boron – B; Phosphorus – P; Sodium – Na

Exercise atome-ammoniak

Exercise atome-methan