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Topic 4: Inorganic Chemistry and the Periodic Table
4.2 Group 7: The Halogens
4.2.2 Chemical Properties
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Which halogen is the strongest oxidizing agent in Group 7?
Fluorine
The oxidizing strength of halogens increases down Group 7.
False
The weakest oxidizing agent in Group 7 is
astatine
What type of compounds are formed when halogens react with metals?
Ionic compounds
Fluorine reacts more vigorously with metals than
iodine
does.
Arrange the halogens in order of decreasing reactivity with hydrogen:
1️⃣ Fluorine
2️⃣ Chlorine
3️⃣ Bromine
4️⃣ Iodine
What is the general formula for the reaction between a halogen and hydrogen?
H_{2} + X_{2} \rightarrow 2HX</latex>
The reaction between fluorine and hydrogen is explosive, even at low
temperatures
The reaction between iodine and hydrogen is reversible and requires
heating
.
What compound is formed when carbon reacts with fluorine?
C
F
4
CF_{4}
C
F
4
What type of bond is formed when halogens react with non-metals?
Covalent bond
The reactivity order of halogens with hydrogen is: Fluorine > Chlorine > Bromine >
Iodine
Arrange the halogens in order of decreasing reactivity with hydrogen:
1️⃣ Fluorine
2️⃣ Chlorine
3️⃣ Bromine
4️⃣ Iodine
The reaction between carbon and halogens requires high temperatures or
catalysts
.
What are the products formed when halogens react with hydrogen?
Hydrogen halides
What is the reactivity order of halogens with hydrogen?
F > Cl > Br > I
Fluorine reacts with hydrogen explosively, even at low
temperatures
Chlorine reacts with hydrogen vigorously and requires
UV light
or heat.
What conditions are required for bromine to react with hydrogen?
Moderate heating
Iodine reacts with hydrogen slowly and the reaction is
reversible
What type of organic compounds do halogens form with carbon?
Halogenated organic compounds
Reactions of halogens with carbon require high
temperatures
or catalysts.
What are the key points of halogen reactions summarized in the material?
Covalent compounds, electronegativity, reactivity trend
Halogens react with water to form hypohalous acids and hydrogen
halides
What is the general equation for the reaction of halogens with water?
X_{2} + H_{2}O \rightarrow HOX + HX</latex>
Match the halogen with its reaction with water:
Fluorine ↔️ Extremely vigorous
Chlorine ↔️ Moderate
Bromine ↔️ Slow
Iodine ↔️ Negligible
The reactivity of halogens with water decreases down Group 7 due to decreasing electronegativity and
electron affinity
.
What is the reactivity order of halogens in displacement reactions?
F > Cl > Br > I > At
Fluorine can displace chlorine in
2
N
a
F
2NaF
2
N
a
F
to form2NaCl</latex> and F_{2}
Which halogen has the highest oxidising strength?
Fluorine
The oxidising strength of halogens decreases down Group 7 due to decreasing electronegativity and
electron affinity
.
Halogens react with metals to form ionic compounds called
salts
What is the product of the reaction between sodium and chlorine?
NaCl</latex>
Arrange the halogens in order of their reactivity with metals:
1️⃣ Fluorine
2️⃣ Chlorine
3️⃣ Bromine
4️⃣ Iodine
Halogens form covalent compounds with non-metals due to their high
electronegativity
.
Match the halogen with its reaction with hydrogen:
Fluorine ↔️ Explosive
Chlorine ↔️ Vigorous
Bromine ↔️ Moderate
Iodine ↔️ Slow
The general equation for the reaction of halogens with carbon is
C
+
C +
C
+
2
X
2
→
C
X
4
2X_{2} \rightarrow CX_{4}
2
X
2
→
C
X
4
, where X represents a halogen
What conditions are required for the reaction of chlorine with carbon to form
C
C
l
4
CCl_{4}
CC
l
4
?
Heat or catalysts
What compounds do halogens form when reacted with hydrogen?
Hydrogen halides
Halogens react with hydrogen to form
hydrogen
halides.
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