The document provides information about manufactured substances in industry, including:
1) The Haber process is used to manufacture ammonia from nitrogen and hydrogen gases under high temperature and pressure. Ammonia is then used to produce fertilizers and other chemicals.
2) Synthetic polymers are large molecules composed of repeating monomer units joined by covalent bonds. Examples include polyethene from ethene monomers and polyvinyl chloride from chloroethylene monomers.
3) Composites are strong materials made by combining two or more components, such as reinforced concrete used in construction.
The pattern of question paper in the subject Mathematics has been changed in CBSE,India.I am uploading the paper with marking scheme so that students will be benefitted-Pratima Nayak,KVS
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
1. Set 5 Marking Scheme :Manufactured Substances in Industry 2010
PAPER 2 : STRUCTURE
NO. Answer Marks
1(a) Haber Process 1
(b) N2 + 3H2 → 2NH3 1
(c) Iron 1
(d) Temperature, 450oC , Pressure 200 atm 1
(e) Ammonium sulphate 1
(f)(i) NH3 + CO2 → CO(NH2)2 + H2O 1
(ii) RMM urea = 60
% N = 2(14) x 100 1
60 1
= 46.6%
(g) 1.Blue precipitate soluble in excess ammonia solution 2
2.Forming dark blue solution
2(a)(i) Contact process 1
(ii) Haber Process 1
(b)(i) 2SO2 + O2 → 2 SO3 1
(ii) Vanadium(V) oxide 1
(c)(i) N2 + 3H2 → 2NH3 1
(ii) Temperature, 450oC , Pressure 200 atm 1
(d)(i) Ammonium sulphate 1
(ii) (NH4 )2SO4
(iii) RMM ammonium sulphate = 132
% N = 2(14) x 100 = 21.2 % 2
132
(e) Manufacture of detergents/ production of fertilizer/ manufacture of artificial fibres/ 1
manufacture of paint / leather tanning/ as electrolyte in car batteries
3(a) Large molecules made up of many identical repeating sub-units called monomers which 1
are joined together by covalent bonds.
(b) Monomer Polymer 4
Amino acid Protein
Glucose Starch
Ethene Polyethene
Isoprene Natural rubber
(c)
H H
| |
── C ── C ──
| |
H H n
(d)(i) PVC does not rust, iron will rust
(ii)
Cl
(e) Natural polymer – protein, starch, natural rubber
Synthetic polymer – polyethene, polychloroethene
Chemistry Perfect Score Module Form 4 2010 Marking Scheme Set 5 38
2. Set 5 Marking Scheme :Manufactured Substances in Industry 2010
PAPER 2: ESSAY
No. Answer Marks
4(a)(i) 1. pure metal atom have similar size and shape
2. arranged closely and form layers of atoms
3.when force is applied, layers of atoms slide on each other easily 3
(ii) 1. the atoms of the foreign metal added to pure metal have different size
2. these atoms distrupts the arrangement of the pure metal atoms
3. preventing the layers of metal from sliding on one another easily 3
(iii) 1. increase the strength and hardness of metal
2. prevent corrosion of metal
3. improve the appearance of metal and make it more attractive. 3
(b)(i) 1. aluminium is a pure metal
2. it is soft and not strong / cannot withstand compression 2
(ii) 1. duralumin
2. an alloy of aluminium that stronger and harder than aluminum. 4
3. can withstand compression
4. yet is light as aluminium
(iii) 1. tin and copper
2.stronger than tin 4
3. able to withstand corrosion
4. shinier surface than tin
20
5(a)(i) Large/long/giant/big chain smaller molecules/monomers made from joining of smaller 1
monomers.
Synthetic Monomers Uses
(ii) polymers
Polythene Ethene Plastic bags/ containers/ electrical
wiring
Polypropene Propene Piping / bottle crates/ carpets / car
batteries/ ropes
Polyvinyl Chloroethene/vinyl chloride Artificial leather/water pipes
Chloride
Perspex Methylmethacrylate/methyl Safety glass/reflectors/lens
2-methyl propenoate 6
Terylene Hexane-1,6-diol Clothing/sails/ropes
Nylon 1,6-diamine hexane Rope/clothing/carpets
Name of 2 synthetic polymers 2 marks
their are respective monomers 2 marks
2 uses
(b)(i) Formed by combining two or more different substances/ materials 2
That is better/stronger/superior /durable than the original component.
Composites material Uses
Reinforced Concrete Buildings / bridges/ oil platforms
Superconductors Magnetic energy-storage systems/ generators/
transformers/ computer parts
Fibre optic Telephone lines/ mobile phones/video cameras/
LAN
Fibre glass Household products: water storage tanks/
badminton rackets/small boats/skis/helmets
Chemistry Perfect Score Module Form 4 2010 Marking Scheme Set 5 39
3. Set 5 Marking Scheme :Manufactured Substances in Industry 2010
Photochromic glass Optical lenses/car windshields/windows in
buildings/ information display panels/ lens in 4
cameras/optical switches
Names of 2 composites material.
Respective use.
(c) 1. Sulphur dioxide gas / toxic waste dissolves in
rain / water to form acid rain /acid dissolved in
water.
2. Acid rain lowers the pH value of water / soil / air/
increases acidity.
3. Causing the death of plants.
4. Causing the death of aquatic creatures/fish
5. Causing damage to buildings / vehicles.
6. Decay of aquatic creatures by bacteria causing
7. The oxygen content in water to become less// (BOD)
increases. 7
8. The air pollution index reading will increase // air
quality become worse // causing the air pollution.
( choose any 7 above )
20
PAPER 3: STRUCTURE
No. Answer
6(a) Copper : 0.53 cm
Brass : 0.27
(b) Operation definition: if the dent is smaller, the material is harder
(c)
Manipulated variable The way to manipulate variable
Different type of material Repeat the experiment by using brass block to
replace copper block.
Responding variable What to observe in the responding variable
Diameter of the dent Observe the different diameter made by the
ball bearing on both copper and brass.
Fixed variable Way to maintain fixed variable:
Mass and height of the weight, size of the Use the same mass and height of the weight
steel ball bearing and size of the ball bearing in each experiment
(d) Bronze is harder than copper
Pure metal: iron, copper, aluminium
(e) Alloy : bronze, duralumin
Chemistry Perfect Score Module Form 4 2010 Marking Scheme Set 5 40
4. Set 5 Marking Scheme :Manufactured Substances in Industry 2010
No. Answer
7(a) Concrete is a composite material consisting of small stones and sand bound together by cement.
(b) Steel , steel is strong and high tensile stength
(c) Make pillars of high rise buildings
Make pillars of bridges
Make pillars of oil rig platform
(d) Is reinforced concrete stronger than concrete ?
(e)(i) Concrete and reinforce concrete
(ii) Hardness of the material
(iii) Height dropped of the weight, mass of the weight, size of the reinforced concrete
(f) The strength of the composite material is the ability of the material to withstand an impact (force).
The stronger the material, the heavier the weight required to break the material.
(g)(i) To make sun glasses / window panes / camera lenses
(ii) Silver nitrate solution is added to sodium chloride solution in a beaker and stirred.
The mixture is filtered and the precipitate rinsed with distilled water.
The precipitate is dried in an oven
PAPER 3 : ESSAY
8. (i) KK051201 - Problem statement
No. Rubric
[ Able to state the problem statement clearly and accurately]
Suggested answer
3
Does iron rust faster than steel?
[Able to state the problem statement slightly inaccurate]
Suggested answer
2
To study the rusting of iron and steel.
[Able to provide an idea of a problem statement]
1 Suggested answer
The rusting of iron and steel
8 (ii) KK051202 – Stating all variables
Score Rubric
[Able to state all the corresponding variables accurately]
Suggested answer
Manipulated variable : Iron and steel
3 Responding variable : Intensity of amount of blue colour
Fixed variables : Siza of nails, concentration of solutions
used, duration for rusting
2 [Able to state two corresponding variables accurately].
1 [Able to state any one corresponding variable correctly].
Chemistry Perfect Score Module Form 4 2010 Marking Scheme Set 5 41
5. Set 5 Marking Scheme :Manufactured Substances in Industry 2010
8 (iii) KK051202 – Statement of hypothesis
Score Rubric
[Able to state the relationship between manipulated variable and responding variable correctly]
Suggested answer:
3
Iron rusts faster than steel.
[Able to state the relationship between manipulated variable and responding variable but in
reverse direction]
2
Suggested answer:
Steel rusts faster than iron
[Able to state an idea of the hypothesis]
1 Suggested answer:
Iron and steel rust.
8. (iv) KK051205 – List of materials and apparatus
Score Rubric
[Able to list all materials and apparatus correctly]
Suggested answer
Materials
3 Iron nail, steel nail, jelly solution, potassium hexacyanoferrate(III) solution, Sandpaper,
Water.
Apparatus :Test tubes
[Able to list the basic materials and apparatus required]
Suggested answer
2 Iron nail, steel nail, potassium hexacyanoferrate(III) solution
Apparatus : Test tubes
[Able to provide an idea of materials and apparatus used]
1 Suggested answer
Iron nail, steel nail, jelly solution
8. (v) KK051204 – Experimental procedure
Score Rubric
[Able to state all experimental steps correctly]
Suggested answer
1. Rub nails with sandpaper until clean of rust.
2. Put iron nail in test tube 1 and steel nail in test tube 2.
3 3. Add jelly solution containing potassium hexacyanoferrate(III) into the test tubes until the
nails are completely immersed in it.
4. Leave the nails for three days.
5. After three days, observe the intensity of the blue colour.
[Able to provide 3 steps correctly to carry out the experiment]
2
Steps 2, 3 and 4
[Able to provide minimum of 2 steps correctly to carry out the experiment]
1
Steps 2 and 3
Chemistry Perfect Score Module Form 4 2010 Marking Scheme Set 5 42
6. Set 5 Marking Scheme :Manufactured Substances in Industry 2010
8. (vi) KK 0501-05 – Tabulation of data
Score Rubric
[Able to construct a table correctly containing the following elements]
- Columns and rows
- Observation for each test tube
Suggested answer
3
Test tube No. Intensity of blue colour
1
2
[Able to construct a tabulation of data containing the following elements]
- Rows and columns present
- Observation
Suggested answer
2
Test tubes Observation
[An idea of a tabulation of data ]
1
- Minimum of 2 rows and columns
Chemistry Perfect Score Module Form 4 2010 Marking Scheme Set 5 43