Question

Clotting of blood using alum is a
1.physical change
2.chemical change
3.both 2 and 3
4.rancidity​

Answer 1

Option 2.

Hope it helped you.

Answer 2

Physical and chemical changes of blood clot

Explanation:

• It's both at the same time. Platelets expand their tentacles and latch on to the walls of the shattered vessel, forming a net to catch the red cells that are streaming through.
• The polymerization of fibrinogen to fibrin occurs, tightening the web and preventing plasma leakage. That's the chemical part, where 13 blood coagulation factors come together to form a clot.
• Thrombin turns fibrinogen, a blood clotting protein that is normally dissolved in blood, into long fibrin strands that radiate from the clumped platelets and form a net that entraps additional platelets and blood cells.  
• There are 13 blood variables that contribute to fibrin formation chemically (clot). Platelets are the physical part because platelets can stretch their legs out and contact another platelet leg to make a net to trap the blood cells which impedes blood loss.
• It Adds the fibrin glue to the platelet plug and you have made a good clot.