Chapter 8 - Reactivity Trends Flashcards
Group 2, The halogens and Quantitative analysis.
What is a reducing agent?
A species that donates it’s electrons to another species, thereby reducing that species.
Which group are reducing agents commonly found?
Group 2
What is the trend in reactivity down group 2?
Reactivity increases.
Explain the trend of reactivity down group 2
Increased atomic radius and shielding effect so ionisation energies decrease. Therefore it’s easier to lose electrons.
What are the products of a group 2 element reacting with water?
Metal hydroxide and hydrogen
What is the product of a group 2 element reacting with oxygen?
Metal oxide
What is the trend of solubility down group 2?
Increases
Explain the trend of solubility down group 2
Down the group, the solution has a greater concentration of OH-.
Given that group 2 oxides, hydroxides and carbonates neutralise acids, what can they be referred to as?
Bases
Given that most group 2 oxides, hydroxides and carbonates are soluble in water, what are they also besides bases?
Alkalis
What is the use of calcium hydroxide in agriculture?
Increases the pH of acidic soils.
Ca(OH)(2) + 2H+ -> Ca2+ + 2H(2)O
How are group 2 compounds used in medicine?
Used in indigestion tablets as antacids, often a suspension of a metal hydroxide in water.
What is another name for group 2?
Alkaline Earth Metals
What is another name for group 7?
Halogens
What is the trend in boiling point down group 7?
Increases