Pregunta 1
Pregunta
Why are elements in group O inert?
They have a [blank_start]fully filled valence electron shell[blank_end] and does not require to [blank_start]gain[blank_end], lose or [blank_start]share[blank_end] [blank_start]electron[blank_end] with any other atom to [blank_start]obtain[blank_end] a [blank_start]fully filled valence electron shell[blank_end]. Hence, they are inert.
Pregunta 2
Pregunta
Ionic Bonding is the a reaction between two non-metal elements
Pregunta 3
Pregunta
Balance the equation
Fe2O3 ([blank_start]s[blank_end]) + [blank_start]3[blank_end]CO ([blank_start]g[blank_end]) → [blank_start]2[blank_end]Fe ([blank_start]l[blank_end]) + [blank_start]3[blank_end]CO2 ([blank_start]g[blank_end])
Pregunta 4
Pregunta
The following diagram shows a fractional distillation of crude oil. Fill in the blanks provided (Use all small caps)
Respuesta
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petroleum gas
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petrol
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naphtha
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kerosene
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diesel oil
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lubricating oil
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bitumen
Pregunta 5
Pregunta
What are the uses of each fraction, drag and drop to the appropriate blanks. Any mistakes my result in 0 marks for this question.
Respuesta
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Fuel for cooking and heating
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Fuel for car engines
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Raw material - petrol chemical industry
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Fuel for aircraft engines: Fuel for heat
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Fuel for diesel engines. Eg. Lorries
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For lubricating machines; For making wax
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For paving road surfaces
Pregunta 6
Pregunta
What is the purpose of adding limestone into the blast furnace
[blank_start]To remove acidic impurities[blank_end] such as sand (Silicon dioxide)
Pregunta 7
Pregunta
Question: Why are alloys harder and stronger than pure metals
Answer: Atoms in an alloy are made up of [blank_start]different sizes[blank_end] thus it [blank_start]disrupts[blank_end] the orderly arrangement of atoms in the pure metal. The layers of atoms [blank_start]cannot[blank_end] slide over each other [blank_start]easily[blank_end]. Thus, alloys are harder and stronger than pure metals
Respuesta
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different sizes
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same sizes
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disrupts
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smoothens
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cannot
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can
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easily
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in a disorderly manner
Pregunta 8
Pregunta
What is the composition of Argon in the air
Pregunta 9
Pregunta
What is the main source of Carbon Monoxide (CO)?
Pregunta 10
Pregunta
The method to obtain for Barium Sulfate is through adding excess insoluble reactant to acid.
Pregunta 11
Pregunta
What are the examples of Acidic oxide or neutral oxide (Choose more than one answer)
Respuesta
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Carbon dioxide
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Silicon dioxide
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Sulfur dioxide
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Water
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Aluminium oxide
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Oxides of nitrogen
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Lithium oxide
Pregunta 12
Pregunta
Describe a test for ammonia gas
Test: Place a [blank_start]moist[blank_end] [blank_start]red[blank_end] litmus paper at the mouth of the test tube
Observation: If ammonia gas is present, [blank_start]red[blank_end] litmus paper turns [blank_start]blue[blank_end]
Respuesta
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moist
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dry
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red
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blue
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red
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blue
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blue
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red
Pregunta 13
Pregunta
Why do ionic compounds conduct electricity in molten and aqueous states but not in solid states?
In [blank_start]molten and aqueous[blank_end] states, there are [blank_start]free-moving[blank_end] ions to serve as charge carriers. In [blank_start]solid[blank_end] states, ions are held in a [blank_start]fixed position[blank_end] in the [blank_start]lattice structure[blank_end], so there are no free-moving ions to serve as [blank_start]charge carriers[blank_end].
Respuesta
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molten and aqueous
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free-moving
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solid
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fixed position
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lattice structure
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charge carriers
Pregunta 14
Pregunta
Label the diagram
Respuesta
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condenser
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distillate
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thermometer
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boiling chips
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mixture
Pregunta 15
Pregunta
Why is recycling metals important?
Respuesta
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They are finite resources
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We have the rights to save them
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They are cheaper than extracting of metals
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Recycling requires less energy than mining
Pregunta 16
Pregunta
In what conditions will metals rust?
Respuesta
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Exposed to air
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Moist
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Dry
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Vacuum
Pregunta 17
Pregunta
To test whether it is an alkane or alkene, we need to use addition of aqueous bromine.
Pregunta 18
Pregunta
To test acidity of the soil:
Add a few drops of [blank_start]universal indicator[blank_end]. If the colour turns [blank_start]red[blank_end], yellow or orange, it is [blank_start]acidic[blank_end]. If the colour is [blank_start]green[blank_end], it is neutral. If the colour turns, blue, purple or violet, it is [blank_start]alkaline[blank_end].
Respuesta
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alkaline
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acidic
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green
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red
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universal indicator
Pregunta 19
Pregunta
What is the condition for cracking reaction of alkane
1) [blank_start]600[blank_end] degrees celcius
2) Powered [blank_start]aluminium oxide[blank_end] as catalyst
Pregunta 20
Pregunta
Margarine is an example for addition reaction of hydrogen.