The particle model

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Question 4
Easy
a.

Complete the sentences about the structure of an atom.

Use words from the list.

You may use each word once, more than once, or not at all.

  • Electrons
  • Mass
  • Negative
  • Neutrons
  • Nucleus
  • Positive
  • Protons
  • Zero
  1. A proton has a ................................................ charge.
  2. An uncharged atom has a total charge of ................................................ .
  3. The nucleus consists of protons and ................................................ .
  4. Most of the volume of an atom is empty space surrounding the ................................................ .
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b.

An aluminum block has a mass of 13500 kg13500\text{ kg}13500 kg and a volume of 5.0 m35.0\text{ m}^35.0 m3.

Calculate the density of aluminum.

Use the equation: $\text{density} = \text{mass} \div \text{volume}$

Density = ................................................ kg/m3\text{kg/m}^3kg/m3

[2]
c.

The diagrams, X, Y and Z, show the particles in three states of matter.

Three separate square boxes labeled X, Y, and Z. Box X shows a tightly packed, highly ordered 6 by 6 grid of circles representing particles in a solid. Box Y shows only 5 widely separated circles representing particles in a gas. Box Z shows many circles closely packed but in a disordered, random arrangement representing particles in a liquid.

Write the letters in the boxes to give the correct order of density, from least to most dense.

Least dense →\rightarrow→ Most dense: [ ] [ ] [ ]

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d.

Explain why you chose the order in (b)(ii).

[1]

The particle model Questions

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