Chemistry Is Everywhere I (Test 1.2)

Which of the following is NOT the general attribute of plastic material as a packaging material?

• light in weight with significant degrees of strength

• thermal and electrical conductors

• resistant to chemicals

• can be processed in various ways

For figure below, what type of polymer it is?

-(M1)-(M2)-(M1)-(M2)-(M1)-(M2)-(M1)

• Graft copolymer

• Random copolymer

• Block copolymer

• Alternating copolymer

Arrange the following based on the sequence of addition polymerization of poly(ethylacrylate):

I. Many monomer molecules are added rapidly and radical is regenerated after addition of each monomer.

II. Two free radicals are produced when benzoyl peroxide molecule is decomposed by heating.

III. Two free radicals react with each other and end the reaction.

IV. The free radical attacks the monomer, adds to it and regenerate free radical.

• II,IV,I,III

• III,I,IV,II

• IV,I,III,II

• III,IV,I,II

Which of the following is TRUE about condensation polymerization?

I. It is a fast process.

II. A byproduct such as water molecule is usually formed.

III. The polymerization process involves a radicals and monomers.

IV. Polyamide is formed when monomers of two functional groups react together and form covalent bonds.

• I,II

• I,III,IV

• II,III,IV

• II,IV

• II,III

What is the function of "plasticizer" when added as an additive in polymer production?

• to reduce the combustibility

• to increase flexibility and workability

• to strengthen a polymer

• to reduce polymer degradation

Which of the following is NOT a natural polymer?

• Protein

• Starch

• Monosaccharide

• Polyisoprene

Which of the following is TRUE about protein?

I. It is made up of monomers known as amino acids.

II. The monomers in protein are joined by peptone bonds.

III. Condensation reaction occurs in the formation of protein.

IV. Primary protein is the exact sequence of amino acids before folding.

V. The general molecular formula of amino acids is RCH(NH2)COOH

• I,II,III,IV

• I,III,IV,V

• I,II,IV,V

• II,III,IV,V

Which of the following is not true?

• The salt produced from neutralization of a strong acids and a strong base will generate an solution when it dissolves in water

• Acids are substances that produce hydrogen ions(H⁺)in water

• An alkaline buffer solution has a pH greater than 7

• At pH 7, the substance or solution is at neutral and means that the concentrations of H⁺ an ions are the same

Human blood is

• Acidic

• Alkaline

• A pH indicator

• Neutral

Which of the following is correct?

• Diet rich in magnesium, potassium and fiber is has negative impact on acid- base balance in our body

• The pH of an alkaline buffer solution will increase drastically above 7 when a small amount of base is added to it

• Frequent soft drink intake does not cause dental erosion

• Acidosis is a condition in which there is too much acid in the body fluids