Chemistry Quiz 1 (Chapter 1 to 13)

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.

Ionic Bonding is the a reaction between two non-metal elements

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])

The following diagram shows a fractional distillation of crude oil. Fill in the blanks provided (Use all small caps)

What are the uses of each fraction, drag and drop to the appropriate blanks. Any mistakes my result in 0 marks for this question.

What is the purpose of adding limestone into the blast furnace [blank_start]To remove acidic impurities[blank_end] such as sand (Silicon dioxide)

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

What is the composition of Argon in the air

What is the main source of Carbon Monoxide (CO)?

The method to obtain for Barium Sulfate is through adding excess insoluble reactant to acid.

What are the examples of Acidic oxide or neutral oxide (Choose more than one answer)

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]

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].

Label the diagram

Why is recycling metals important?

In what conditions will metals rust?

To test whether it is an alkane or alkene, we need to use addition of aqueous bromine.

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].

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

Margarine is an example for addition reaction of hydrogen.