Final M.3 second semester
Compared to HDPE,LDPE has...
A
B
C
D
Two types of polymer are shown below. Which of the following statements concerning these polymers is correct?
X is thermosetting whereas Y is thermoplastic
Both are thermoplastic
X is thermoplastic whereas Y is thermosetting
Both are thermosetting
The difference between traditional ceramics and new ceramics is that most traditional ceramics are based primarily on silicates whereas the most new ceramics are based on oxides, carbides, or nitrides: this state true or false
True
False
Which of the following contains significant amounts of aluminum oxide
Alumina
Quartz or silica
Glass products are based primarily on which one of the following minerals
Alumina
Silica
Which one of the three polymer types is not a plastic
Elastomers
Thermoplastics
Thermosets
He defining property of a thermoplastic polymer is that it can be heated from a solid state to a viscous liquid state and then cooled back down to solid, and that this heating and cooling cycle can be applied multiple times
True
False
Which one of the following is the chemical formula for the repeating unit in polyethylene
CH2
C2H4
C3H6
C5H8
Which of the following polymers are normally thermoplastic
Bekalite
Polyethylene
Vulcanization in car tire
Compared to thermoplastics, thermosetting polymers are characterized by which of the following properties
Cannot be remelted
Capable of higher service temperatures
Less ductile
All of them
Match with picture Question
PE
PP
PVC
PS
PTFE
Match with picture Question
PE
PP
PVC
PS
PTFE
Match with picture Question
PE
PP
PVC
PS
PTFE
Match with picture Question
PE
PP
PVC
PS
PTFE
Match with picture Question
PE
PP
PVC
PS
PTFE
A chemical reaction is a process in which
Products change into reactants
Substances change state
Amount of atoms reactants and products are equal (the law of conservation of mass)
During a chemical reaction,
New elements are produced
Atoms are destroyed
Atoms are rearranged
Elements are destroyed
An equation is balanced by
Adding coefficients
Changing subscripts no.
Adding elements as necessary
Erasing elements as necessary
What are the reactants in the following chemical equation: Zn + CuSO4 -----> ZnSO4 + Cu
Zinc and copper
Zinc and copper (II) sulfate
Zinc sulfate and copper
Only zinc
The polysaccharide or carbohydrates as the natural polymer scattering the tiny formation molecule are water H2O, what this type of polymerisation reaction?
Addition
Condensation
In the chemical reaction CH4 + 2O2 → CO2 + 2H2O, there are reactants on the left of the equation and products on the right. If you count the atoms in the reactants, there are
4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms
1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms
1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms
4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms
A
B
C
D
If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products in a balanced equation could be
4CO2 + 3H2O
3CO2 + 4H2O
2CO2 + 3H2O
3CO + 4H2O
A
B
C
D
If two substances react and the temperature of the mixture increases, the reaction is
Endothermic
Exothermic
If two substances react and the temperature of the mixture decreases, the reaction is
Endothermic
Exothermic
When you drink water from bottle done should to clean up litter in which type of trash bin?
1
2
3
4
5
6
7
A
B
C
D
A
B
C
D
Set A=
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
Set B=
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
Set C=
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
Set D=
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
What type of reaction of this set?
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
This following reaction is the same as which set? Na + H2O-----> NaOH+H2
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
This following reaction is the same as which set? PbI+ KNO3----->PbNO3+KI
Synthesis
Decomposition reaction
Single replacement reaction
Double replacement reaction
Combustion
Define the following terms as they are commonly used in order.
A
B
C
D
Ba(OH)2+2NH4Cl+E---->BaCl2+2NH4OH is______?
Endothermic
Exothermic
CaCO3 + H2SO4----> CaSO4 + CO2+ H2O+ E is______?
Endothermic
Exothermic
CH3COOH + NaHCO3 +E ----> CH3COONa + CO2+ H2O is______?
Endothermic
Exothermic
When put steel wool in vinegar(acetic acid) this reaction energy type is______?
Endothermic
Exothermic
What are the missing coefficients for the equation ? Al2 (SO4)3(aq) + KOH(aq) ---> Al(OH)3(aq) + K2SO4(aq)
1,3,2,3
2,12,4,6
4,6,2,3
1,6,2,3
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be? Nitrogen trifluoride or NF3-----> nitrogen + fluorine
3F
6F2
3F2
F3
Thermosetting materials are___?
The plastics which can be softened even after they have set and hardened
The plastics which require heat and pressure to mould them into shape
None of them correct
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