Harder questions

• Explain the term "oxidation" in terms of reactivity.

  Oxidation is the loss of electrons during a reaction. In terms of reactivity, a substance is more reactive if it readily loses electrons, thus undergoing oxidation more readily.
• What happens to the reactivity of metals as you move from left to right across the periodic table?

  Generally, the reactivity of metals decreases as you move from left to right across the periodic table. This is because metals lose electrons to form positive ions, and as you move rightward, it becomes harder to lose electrons due to increased nuclear charge and smaller atomic size.
• Which type of metals are typically more reactive: alkali metals or transition metals?

  Answer: Alkali metals are typically more reactive than transition metals. Alkali metals readily lose electrons to form positive ions, whereas transition metals are less reactive due to their stable electron configurations.
• 1. Which of the following Group 1 elements is expected to be the most reactive?

  a)Lithium (Li)b) Sodium (Na)c) Potassium (K)
• 1. What happens when magnesium reacts with dilute hydrochloric acid?

  a)Magnesium chloride and water are formed.b) Magnesium hydroxide and hydrogen gas are formed.c) Magnesium oxide and oxygen gas are formed.
• Explain why copper is often used for water pipes despite being less reactive than some other metals.

  Answer: Copper forms a protective layer of oxide on its surface, preventing further corrosion. This makes it suitable for use in water pipes, even though it's less reactive than metals like iron or zinc.