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sample exam questions - materials - pet melting point

by:Cailong     2019-07-31
sample exam questions - materials  -  pet melting point
Please keep in mind that you need to bring a ruler and a calculator during the exam.
Questions about testing math skills usually start with command words like "calculation ". . . ' 'Determine. . . ', 'Estimate. . . ' and 'Measure. . . '.
They will then include blank space for you to show your work.
When the answer to a math question is marked: Full marks for the correct answer (
But it is very important to show your work so that you can check your answer so that if you make a small mistake, you can still get a score for your work)
For work, including replacement and rescheduling, if you make a small mistake, the examiner will praise you for your "mistake.
"Forward Error" means that in a question with multiple sections, your answer to the later question section will be marked based on your answer to the previous section, even if you are wrong.
So if your job is correct, but you are using an incorrect early answer, you can still get full marks in the later answers.
If your answer has a lot of decimals or numbers, make sure you give it a proper decimal or valid number.
If in doubt, match the number of decimal places or valid numbers with the data given in the question.
You may be asked to give it to the unit.
This may give you extra points, so don't forget to check if you need to do so.
A math problem may require you to draw or complete a chart or table.
When drawing a drawing, make sure: draw each point accurately and draw the most suitable line or curve. You may get a grid marked with an axis and the scale has been given.
Sometimes you may get an empty grid that lets you provide your own axis.
When you do this: put the independent variable (
The one that is changing in the experiment)on the x-
Axis and dependent variable (
The one that changed the result)on the y-
Axismake a reasonable scale so that the drawn points cover at least half of the area of the graphLabel axis, including their quantity and units, such as time (s).
These questions were written by the Bitesize consultant as a suggestion for the type of questions that may arise in the test paper.
Question 1-
It takes 46 minutes.
1 kg of the energy of aluminum is extracted from the ore.
It takes only 5% to recycle 1 kg of aluminum.
Calculate the energy used to recover 1 kg aluminum. [1 mark]
[Secret answer]1]
Question 2-
Iron ore in a mine contains 35% of iron.
Calculate the mass of the scrap rock generated from 500 kg of the ore. [2 marks]
Revealing the burst mass of the obtained iron = × 500 kg = 175 kg [1]
So much Waste = 500 kg-
175 kg = 325 kg [1]
Question 3-
Higher problem this table shows the energy needed to get three metals from ore and recycled materials.
Get the metal energy needed for the metal from the ore (MJ/kg)
Get the energy needed for the metal from the recycled material (MJ/kg)Melting point (°C)
Calculate the difference between the energy required to obtain 1 kg zinc from recycled materials and the energy required to extract 1 kg zinc from ore. [1 mark]b)
Calculate the energy required to obtain copper from recycled materials, as a percentage of the energy required to extract copper from ore.
Answer two important numbers. [2 marks]c)
It is recommended that the energy required to obtain 1 kg copper from recycled materials is different from the energy required to obtain 1 kg zinc from recycled materials. [1 mark]
Reveal answerupdowna)50 -
Recycled materials [12 less = 38 MJ1]b)
× 100% = 41 % [2]
Reward if the answer is incorrect [1]
For the right job c)
The melting point of copper is higher, so the energy required to melt 1 kg of scrap copper in the recovery process is more than the energy required to melt 1 kg of scrap zinc [1]
Question 4-
This table compares disposable cups made of different materials.
FactorCup made of PET made of materials obtained from crude oil (cup A)
A cup made of PET made of material obtained from corn starch (cup B)
The energy of making Cup materials (MJ/cup)1. 50.
Make the energy of the cup with its material (MJ/cup)0. 50.
5 carbon dioxide emissions from manufacturing and transporting cups (g/cup)
Use fertilizer 6046 (g/cup)00.
04 use the data in the table to compare two types of disposable cups. [4 marks]
Revealing the answer the energy required to make A cup material is more than twice the energy required to make a B cup material [1]
The energy required to make each cup with its material is the same [1]
Making cups A will produce more carbon dioxide emissions. 1]
B cup requires fertilizer, A cup [no fertilizer]1]
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