A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

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Question 1
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This question is about elements, compounds, and mixtures.

a.

Which type of substance is clean, dry air?

  • Element
  • Compound
  • Mixture
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b.

The diagrams in Figure 1 represent different substances using circle models.

◯\bigcirc◯ and ∙\bullet∙ represent atoms of two different elements.

Figure 1

Using Figure 1: Which diagram represents a pure compound?

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c.

Using Figure 1: Which diagram represents a mixture of two elements?

[1]
d.

Substances can be separated from mixtures using different methods. State the method used to separate a mixture of different coloured pigments in food colouring.

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e.

A liquid mixture containing three hydrocarbons with boiling points of 36∘C36^\circ\text{C}36∘C, 69∘C69^\circ\text{C}69∘C, and 98∘C98^\circ\text{C}98∘C is separated by fractional distillation. Which hydrocarbon distils and is collected first?

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A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes