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Groups 1, 7 and 0

GCSE chemistry and combined chemistry

QuestionAnswer
In terms of electrons, what do group 1 elements have in common? 1 electron in the outer shell
In terms of electrons, what do group 7 elements have in common? 7 electrons in the outer shell
In terms of electrons, what do group 0 elements have in common? Full outer shell
What is more reactive, lithium or sodium? Sodium
What is more reactive, chlorine or bromine? Chlorine
Define inert Un-reactive
Explain why the noble gases are inert They have full outer shells, so do not need to gain or lose electrons
State the trend in the melting points of the alkali metals Gets lower down the group
What state are fluorine, chlorine, bromine and iodine at room temperature? Gas, gas, liquid, solid
Balance the equation: Li + H₂O → LiOH + H₂ 2Li + 2H₂ → 2LiOH + H₂
State the trend in melting and boiling points for the halogens as you go down the group. Predict what state astatine will be. As you go down the group melting point increases. F2 and Cl2 are gases, Br2 is a liquid, I2 is a solid. At2 will be a solid
How can chlorine be tested for? Bleaches damp litmus paper white
Explain why the group 1 elements are called alkali metals They are metals that form alkalis when they react with water
What is a displacement reaction? A reaction in which a more reactive element takes the place of a less reactive element in a compound
Explain why the following reaction does not proceed: KBr + I₂ Iodine is less reactive than bromine so cannot displace it
Balance the below equation and explain why it is a displacement reaction: KBr + Cl₂ → KCl + Br₂ 2KBr + Cl₂ → 2KCl + Br₂ , chlorine has displaced bromine as it is more reactive
Explain why fluorine is more reactive than chlorine Fewer shells/electrons, less shielding (or stronger attraction from nucleus), easier to gain electrons
Explain why potassium is more reactive than lithium (3 marks) More shells/electrons, less shielding (or weaker attraction from nucleus), easier to lose electrons
How do halogens react with magnesium? Mg (s) + Cl2 → MgCl2 (s)
What happens with halogens react with hydrogen? What is the pH when the product dissolves in water? H2 (g) + Cl2 (g) → 2HCl (g) - pH will be low as forms an acid
Created by: JBearfield