Economic importance of vanadium and chromium
V
a small amount in steel gives a very hard, corrosion-resistant alloy (car springs); V2O5 is a colouring agent in ceramics and glass, a catalyst, and used in making strong magnets ('magnetic conductors' in the book).
The idea, in English
V
a small amount in steel gives a very hard, corrosion-resistant alloy (car springs); V2O5 is a colouring agent in ceramics and glass, a catalyst, and used in making strong magnets ('magnetic conductors' in the book).
Cr
metal plating and leather tanning; Cr2O3 for dyes; K2Cr2O7 as an oxidizing agent.
Explain in Egyptian Arabic
الـ V
كمية صغيرة منه في الـ steel بتدي alloy جامد جدًا ومقاوم للـ corrosion (بيتعمل منه الـ car springs). والـ V2O5 بيتستخدم كـ colouring agent في الـ ceramics والـ glass، وكـ catalyst، وفي صناعة الـ strong magnetic conductors (ده اسمها في الكتاب).
الـ Cr
بيتستخدم في الـ metal plating والـ leather tanning؛ والـ Cr2O3 للـ dyes؛ والـ K2Cr2O7 كـ oxidizing agent.
المطلوب
توصّل كل عنصر أو compound بالاستخدام بتاعه.
Common misconceptions
- V2O5 is only a dye.
It is also an important catalyst.
Explain in Egyptian Arabic
لأ، الـ V2O5 مش مجرد dye: ده كمان catalyst مهم.
- K2Cr2O7 is a reducing agent.
The opposite
potassium dichromate, K2Cr2O7, is used as an oxidizing agent, not a reducing agent.
Explain in Egyptian Arabic
بالعكس، الـ K2Cr2O7 هو oxidizing agent، مش reducing agent.
Builds on
- Catalyst
- Rusting and corrosion
- Oxidation and reduction by oxygen
- Elements of the first transition series