textile chemistry 2.1 Flashcards
1
Q
Why do polypropylene products float on water?
A
Because of the density
2
Q
Indicate which carbon water leads to a strong polymer?
A
Aromatic rings
3
Q
- How do you know the atomic number of the atom?
A
By the number of protons in an atom
4
Q
- How many valence electrons are there in 02 oxygen ion?
A
8
5
Q
- How many valence electrons are there in o?
A
2
6
Q
- What is the commercial name of polyamide?
A
nylon
7
Q
What is the byproduct of polycompensation polymerization reactions?
A
water
8
Q
- How many hydrogen atoms are in ‘H’ in a butyne alkyne molecule?
A
6
9
Q
- How many valence electrons are there in atom of phosphorus P?
A
5
10
Q
- Which type of hydrocarbon is essential to initiate a polyaddition polymerization?
A
- Alkenes
11
Q
- Calculate the number of neutrons in sodium (Nh3) 12
A
12
12
Q
Which material has a higher strength when wet than when dry?
A
cotton
13
Q
- What elements does hydrocarbon mainly consist of?
A
- Hydrogen and carbon
14
Q
- What is a property of a covalent bond?
A
- 2 electrons are shared between 2 atoms
15
Q
What curve does an elastomer present?
A
C, from bottom left to righT
16
Q
- Which step of the polyaddition polymerization reaction is shown here?
A
Initiation
17
Q
- What is the structural formula of propane?
A
C3H8
18
Q
- What is the property of kevlar?
A
- Very strong
19
Q
- Which property is influenced by the fact that the polymer has a jumping shape structure?
A
- His good stretch
20
Q
- Which hydrocarbon is this c7 and h16?
A
- Heptane
21
Q
- What type of bond does water h20 form?
A
- Polar covalent bond
22
Q
- What is the correct sequence of a polyaddition polymerization process?
A
- Initiation, propagation, termination
23
Q
- Which of the polymers below is made by addition polymerization product method?
A
Polveurethene, PE
24
Q
How are copolymers constructed?
A
With 2 different types of monomers
25
25. Which of the following options is correct in terms of strength?
London < dipole < h-bond
26
26. Describe the alkane below?
3 ethyl octaan
27
27. Why should you be careful with cellulose after washing, even though it is not does this apply to polyamide?
The wet strength of cellulose is much lower than the dry strength
28
28. Calculate the electronegativity of the 'OH' group
1.24
29
29. What is a property of nomex?
- Flame retardant
30
30. What does an atom contain more of if it is positively charged?
Protons then electrons
31
31. Name the line graph below.
Hexa-1-ene
32
Derive from the electron gavage below the type of bonding of sodium
A ionbinding
33
33. How many valence electrons does agron have?
8
34
34. How does the outer ring of the atom relate to the atomic nucleus?
- Electrons move around the atomic nucleus
35
35. Which functional groups are present in polyester?
Esther
36
36. Which material is most suitable for recycling?
A thermoplastic
37
37. What is an example of an elastomer?
Spandex
38
38. Name which of the following diode gases is a noble gas?
?Helium
39
39. What is an octet rule?
- The tendency to fill the outer ring
