Chemistry Assessment

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Is Sodium carbonate soluble

• Yes

• No

Which of the following is not true?

• COPPER

  Making of

  electrical wires

• CALCIUM OXIDE

  Making of cement and mortar

• SAND

  Making of glass

• ZINC

  Making of soft drink can

The higher the ionization energy...

• the more attracted the valence electron is to the nucleus so it is harder to remove

• the less attracted the valence electron is to the nucleus so it is easier to remove

• the more attracted the valence electron is to another electron, so it is harder to remove

• the more repelled a valence electron is to another electron, so it is easier to remove

The alkanes are a homologous series.

What is the general formula of the alkanes?

• n carbon atoms, 2n hydrogen atoms

• 2n carbon atoms, n hydrogen atoms

• n carbon atoms, n+2 hydrogen atoms

• n carbon atoms, 2n+2 hydrogen atoms

A catalyst  

• is added to a reaction to make it slow down 
• breaks apart and is changed 
• provides an energetic short cut to the products 

What is the first stage in the fractional distillation of crude oil?

• Heating, to vaporise the hydrocarbons

• Heating, to make it a hot liquid

• Cooling it

• Separating the fractions

Crude oil is finite because we use it before more can be formed.

How was crude oil formed?

• From the remains of an ancient biomass, consisting mainly of plankton, that was buried in mud

• Mostly from the remains of dinosaur bones

• By fractional distillation

• By cracking

Explain this graph

• A catalyst is used to speed up the reaction rate
• The catalyst provides a short cut to the products
• The red line shows how the catalyst saves energy 
• All of these choices

What property allows us to separate hydrocarbons during fractional distillation?

• Different hydrocarbons have different boiling points

• Different hydrocarbons have different melting points

• Different hydrocarbons are different colours

• Some hydrocarbons have a positive charge and others have a negative charge