Combined Science: Trilogy 8464: C4.Chemical Changes Topical Past Paper Questions

In the Earth most metals are found as compounds. 1 Name one metal that is found in the Earth as the metal itself. [1 mark] Figure 9 shows a reactivity series. Figure 9 Figure 10 shows the electrolysis cell used to extract aluminium from aluminium oxide. Figure 10 Explain what hap…

During electrolysis ions are discharged at the electrodes to produce elements. A student investigates the electrolysis of sodium chloride. 1 Why does solid sodium chloride not conduct electricity? [1 mark] 2 Sodium chloride solution conducts electricity. Complete the sentence. [1…

This question is about hydrogen chloride and hydrochloric acid. 1 Complete the dot and cross diagram to represent the bonding in hydrogen chloride on Figure 7. Use dots (o) and crosses (x) to represent electrons. You should show only the electrons in the outer shells. Figure 7 [2…