Figure 1 shows the particles in three different substances, A, B and C.
Give the letter of the diagram that shows an element.
Give the letter of the diagram that shows a mixture.
Explain, using Figure 1, why substance B is a compound.
This question is about the particles inside an atom.
Table 1 gives information about the three subatomic particles.
Complete Table 1.
Table 1
| Particle | Relative charge | Relative mass |
|---|---|---|
| Proton | ||
| Neutron | .................... | |
| Electron | .................... | very small |
An atom of nitrogen contains 7 protons.
Explain why an atom of nitrogen has no overall electrical charge.
A student is given a beaker containing sand mixed with potassium chloride solution.
Name the process the student should use to remove the sand from the mixture.
The student wants to obtain solid potassium chloride crystals from the solution.
Describe how the student should do this.
A second student wants to obtain pure water from potassium chloride solution.
Name the separation technique the second student should use.
Scientists have changed the model of the atom over time as new evidence was found.
Name the subatomic particle whose discovery led scientists to suggest the plum pudding model.
Describe the plum pudding model of the atom.
State what the experimental work of James Chadwick showed about the atom.
