Podcast
Questions and Answers
What happens to the reactivity of halogens as you move down Group 7?
What happens to the reactivity of halogens as you move down Group 7?
- It increases with atomic size
- It fluctuates irregularly by element
- It decreases with increasing atomic size (correct)
- It remains constant across the group
When chlorine gas reacts with sodium bromide, what color change would you expect to observe?
When chlorine gas reacts with sodium bromide, what color change would you expect to observe?
- Orange indicating Br2 formation (correct)
- Colorless as no reaction occurs
- Yellow from chlorine
- Pink due to NaBr
Which statements about halides are true?
Which statements about halides are true?
- They possess a charge of +1
- They are less stable than metals
- They consist only of gaseous elements
- They can form ionic compounds with metals (correct)
Which halogen would most likely displace iodine from potassium iodide?
Which halogen would most likely displace iodine from potassium iodide?
What trend occurs with the melting and boiling points of Group 7 elements as you go down the group?
What trend occurs with the melting and boiling points of Group 7 elements as you go down the group?
What distinguishes noble gases from other elements in the periodic table?
What distinguishes noble gases from other elements in the periodic table?
Which statement about Group 1 metals is correct?
Which statement about Group 1 metals is correct?
What happens to the reactivity of alkali metals as you move down the group?
What happens to the reactivity of alkali metals as you move down the group?
What is the nature of the compounds formed by alkali metals when they react with non-metals?
What is the nature of the compounds formed by alkali metals when they react with non-metals?
What characterizes the boiling points of noble gases as you go down the group?
What characterizes the boiling points of noble gases as you go down the group?
What kind of solutions do alkali metals produce when dissolved in water?
What kind of solutions do alkali metals produce when dissolved in water?
What do halogens have in common regarding their electron configuration?
What do halogens have in common regarding their electron configuration?
What is a common physical property of halogens?
What is a common physical property of halogens?
Flashcards
Noble Gases
Noble Gases
Group 0 elements with a stable arrangement of electrons, making them unreactive.
Alkali Metals
Alkali Metals
The elements in Group 1 of the periodic table that have one electron in their outermost shell.
Outer Energy Level
Outer Energy Level
The number of electrons in the outermost shell of an atom. It determines the element's reactivity.
Reactivity of Alkali Metals
Reactivity of Alkali Metals
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Halogens
Halogens
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Dissolving
Dissolving
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Alkaline Solution
Alkaline Solution
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Chemical Reaction
Chemical Reaction
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What are halogens?
What are halogens?
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Why do halogens become less reactive down the group?
Why do halogens become less reactive down the group?
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What is a displacement reaction involving halogens?
What is a displacement reaction involving halogens?
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What is the significance of colour change in halogen displacement reactions?
What is the significance of colour change in halogen displacement reactions?
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Why are reactivities of the halogens different?
Why are reactivities of the halogens different?
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Study Notes
Noble Gases
- Elements in Group 0 of the periodic table
- Unreactive
- Do not easily form molecules
- Stable electron arrangements
- Boiling points increase with increasing relative atomic mass
Group 1: Alkali Metals
- Elements in Group 1
- One electron in their highest energy level
- Low density (first three are less dense than water)
- Stored under oil to prevent reaction with oxygen or water
- React with water to release hydrogen and form alkaline solutions
- React vigorously with water, fizzing and moving around on the surface
- Examples: 2Na + 2H₂O → 2NaOH + H₂
Reactions of Group 1
- React in a similar way
- One electron in their outer shell
- React with non-metals to form ionic compounds (e.g., 2Na + Cl₂ → 2NaCl)
- White solids that dissolve in water to form colourless solutions.
Increasing Reactivity Down Group 1
- Reactivity increases down the group
- Larger atoms, outer electron further from the nucleus
- Outer electron more easily lost
Group 7: Halogens
- Elements in Group 7
- Seven electrons in their highest energy level
- Coloured vapours (toxic)
- Form ionic salts with metals (e.g., chloride, bromide, iodide)
- Form molecular compounds with non-metals
- Molecular structure (Clâ‚‚, Brâ‚‚, Iâ‚‚)
Trends in Group 7
- Down the group:
- Higher relative molecular mass
- Higher melting and boiling points (due to increased intermolecular forces)
- Less reactive
Displacement Reactions (Group 7)
- More reactive halogens can displace less reactive halogens from their salts in aqueous solution
- Examples:
- Cl₂ + 2 NaBr → Br₂ + 2 NaCl
- Cl₂ + 2 Nal → I₂ + 2 NaCl
- Br₂ + 2 Nal → I₂ + 2 NaBr
- Colour changes can indicate the reaction (e.g., orange Brâ‚‚, brown Iâ‚‚)
Decreasing Reactivity Down Group 7
- Reactivity decreases down the group
- Larger atoms, outer shell electrons further from nucleus
- Outer electrons less strongly attracted to nucleus
- Outer electrons less easily gained
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Description
Test your knowledge on the properties and reactions of noble gases and alkali metals. This quiz covers essential concepts such as reactivity trends, group characteristics, and chemical reactions. Perfect for chemistry students looking to reinforce their understanding of these important elements.
