Chemistry :lesson 3 quiz

When the scandium reacts with water, the number of produced hydrogen moles is….

• 1

• 2

• 3

• 4

To produce car springs, vanadium is added to iron in

• blast furnace or electric furnace

• oxygen converter or blast furnace

• medrix furnace or open furnace

• Electric furnace or open furnace

which of the following alloys results from replacing an atom with another one of the same size and chemical properties...

• Cu-Al / Ni –Al

• Ni –Cr /steel

• Al - Ni / Al –Cu

• Fe-Cr / Au -Cu

The diagram express the progress of chemical reaction without using catalyst.

By using catalyst ….

• The level of B and E rises

• The level of B decreases

• the level of A and D increases

• the level of B and D decreases.

If the most suitable particles size for reduction process is 40-100 mm³ so all the following is correct except…

• The reduction furnace may contains 15 mm³ particles

• The particles which are 15 mm³ so it needs to be sintering

• Crushing process produce 40 – 100 mm3 particles

• 30 mm³ particles need to be crushed

The …. Ionization energy is high for the non transition element which is used in duralumin alloy

• First

• second

• third

• forth

To plate an iron hand with brass alloy needs using container have…. Solution

• ZnSO₄ - FeSO₄

• Cu²⁺ - steel

• Al⁺³ –Ni ⁺²

• CuSO₄ - ZnSO₄

If the most abundant element in the earth crust combined with 3d elements so, ………are formed

• Alloys

• metal carbonate

• oxides

• interstitial alloy