Understanding Natural Rubber and Latex Coagulation

What is the chemical formula of natural rubber?

• C7H12

• C4H6

• C6H10

• C5H8

What is the name of the monomer that forms natural rubber?

• Ethylene

• Styrene

• Isoprene

• Butadiene

What happens to latex when it is left under normal conditions for several hours?

• It coagulates

• It evaporates

• It dissolves

• It remains liquid

What charge do protein membranes have on their outer surface?

• Positive

• Neutral

• Variable

• Negative

Why do rubber particles in latex repel each other?

• They have the same charge

• They have different charges

• They are too small

• They are too large

What effect does adding acid have on latex?

• It has no effect

• It increases the negative charge

• It neutralizes the negative charge

• It makes the latex more viscous

What happens to rubber particles when the negative charge is neutralized?

• They repel each other

• They evaporate

• They dissolve

• They collide and coagulate

What role do bacteria play in the coagulation of latex?

• They decrease the pH

• They produce ammonia

• They produce lactic acid

• They increase the temperature

How does ammonia prevent the coagulation of latex?

• By dissolving the rubber particles

• By adding more negative charge

• By neutralizing the lactic acid

• By increasing the temperature

What is the effect of lactic acid on the protein membrane in latex?

• It dissolves the rubber particles

• It neutralizes the negative charge

• It increases the membrane's thickness

• It strengthens the membrane