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ID number:524700
 
Author:
Evaluation:
Published: 11.04.2023.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Time period viewed: 2021 - 2025 years
Extract

1. uzdevums (3 punkti)
Latvijas derīgie izrakteņi ir: kaļķakmens, māls, ģipšakmens un smiltis u. c.
Aizpildi tabulu, ierakstot tā derīgā izrakteņa nosaukumu, kura sastāvā ir norādītie ķīmiskie elementi!
Ca Al un Si Si
Ģipšakmens (CaSO4 · 2H2O); kaļķakmens (CaCO3); dolomīts (CaCO3 · MgCO3) Māls (Al2O3; 2SiO2) Smiltis (SiO2)
2. uzdevums (3 punkti)
a) Pabeidz ķīmiskās reakcijas vienādojumu!
2 CuO + C → 2Cu + CO2…

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