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Distinct chemical properties  and uses of halogens compounds

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Distinct chemical properties  and uses of halogens compounds

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o Devise a test for the identification of halides based on their solubility in water and aqueous ammonia and formulate ionic equations
o Predict the ease of oxidation of halide ions with oxidizing acids and decide the products when treated with a non-oxidizing acid.  o Deduce the trend in thermal stability of hydrides and prove them by simple test tube reactions.

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Challenging the learner to apply high order thinking. Apply analysing skills

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Challenging the learner to apply high order thinking. Apply analysing skills

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(Post here what you know based on FLIP learning and evaluate the accuracy in your understanding).

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Self reflection on HPL pathway is commendable Urja

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Challenging the students so as to progress their thinking in depth  on the concept thought

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Challenging the students so as to progress their thinking in depth  on the concept thought

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Q2. Post your answers self-assessed answers here ..........

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Q2. Post your answers self-assessed answers here ..........

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Describe the trends in physical properties of the Group 17 elements with respect to volatility and  interpret the trends in chemical properties such as oxidizing power and thermal stability of hydrides.

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Describe the trends in physical properties of the Group 17 elements with respect to volatility and  interpret the trends in chemical properties such as oxidizing power and thermal stability of hydrides.

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Halogens as oxidizing agents [Solve: Group 17 halogens worksheet: Q1 & Q2 (a)(i); (a)(ii)]

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Halogens as oxidizing agents [Solve: Group 17 halogens worksheet: Q1 & Q2 (a)(i); (a)(ii)]

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Describe and carry out the following chemical reactions of halogens:                              (i) oxidation reactions with metal and non-metallic elements and ions such as iron(II)  and iron(III) ions                        in solution                                                 (ii) disproportionation reactions with cold and hot alkali, e.g. hot potassium hydroxide with iodine to produce potassium iodate(V) 

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Describe and carry out the following chemical reactions of halogens:                              (i) oxidation reactions with metal and non-metallic elements and ions such as iron(II)  and iron(III) ions                        in solution                                                 (ii) disproportionation reactions with cold and hot alkali, e.g. hot potassium hydroxide with iodine to produce potassium iodate(V) 

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MID PLENARY: Solve AO2 (Q2b;c) / AO3 (Q3)

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MID PLENARY: Solve AO2 (Q2b;c) / AO3 (Q3)

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Create Newsletter/ Mind map/   Pictograph (images)/ Animations

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Create Newsletter/ Mind map/   Pictograph (images)/ Animations

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Volatility: Halogens change from Gas to solid as we go down the group.
Color: Color gets darker down the group.
Melting and Boiling point increase down the group as there are more number of electrons down the group so there are more london dispersion forces.
Solubility in water: solubility decreases because they are non polar and can not form bonds with hydrogen in water breaking the hydrogen bonds.
Solubility in organic solvents: Organic Solvents are non polar and halogens are non polar so halogens are soluble in organic solvents.
Question 1:
1)a) D
b) B
c) C
Question 2:
a)i) Cyclo hexane
ii) Dark Orange
Halogens are used as disinfectants.
b)i) Oxidation number of S is H2SO4 is +6 whereas in the product SO2, the oxidation number of S is +4 , the oxidation number had decreased, so it has been reduced.

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Atomic Radius: The atomic radius increases down the group. As the no. of shell increases which means more electrons are present and the distance between the nucleus and outer electron increases.
Electronegativity: There is a decrease in electronegativity down the group since the distance between nucleus and the bonding electron increases and electrons are attracted less strongly by the nucleus.
Volatility; The volatility decreases and this is because down the group the no. of electron increases causing more temporary dipoles to be set therefore increasing the strength of LDF forces which means increased boiling and melting points and they become less volatile.
Color : The color gets darker going down the group starting with fluorine as yellow and with astatine as black.
Solubility; The solubility of the halogens in water decreases as they cannot overcome and form bonds with the strong hydrogen present in water since they are non polar and water is polar .However, in inorganic solvents due the presence of non polar molecules ,they can form bonds and are therefore soluble.

They all posses 7 electrons in their valence shells and the halogens have an unpleasant odor and maybe toxic.

TRENDS IN CHEMICAL PROPERTIES
When halogens react ,they gain an electron to form negative ions. Due to the increase

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-halogens have low melting and boiling points
-there is a trend in state from gas to solid down the group
-halogens also have a specific color which goes darker down the group

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1- the melting and boiling point increases down the group
the colour gets darker down the group
it changes from gas to solid down the group

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1. The state of halogens changes from gas to solid down the group.
2. The melting and boiling point increases as the number of electrons increase.
3. The colors of halogens get darker and more intense down the group.
4. The solubility in water decreases as they cant form bonds strong enough to overcome the strong hydrogen bonds of water.
5. The solubility in organic solvents increases as a result of non polar attractions.

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4/5 marks
volatility 1. color gets darker as you go down the group
2. Melting point and Boiling point increases as you go down the group because London dispersion forces increase
3. solubility in water decreases or is less because they are non polar no bonds can be made with water
4 solubilty in organic solvent increases because non polar attraction
5. halogens  volitility increases they go from gasses to solid as you go down the group

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Volatility: Halogens change from gas to solid down the group. This is because melting and boiling point increase down the group as there are more number of electrons down the group so there are more London dispersion forces. The lower the boiling point, the more volatile the halogen.

Colour: Colour of halogens at r.t.p. becomes darker down the group.

Solubility in water: solubility decreases because halogens are non polar and can not form bonds with hydrogen in water breaking the hydrogen bonds.

Solubility in organic solvents: Organic Solvents and halogens are both non polar so halogens are soluble in inorganic solvents

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1) the colour of the element gets darker down the group
2)more soluble in organic solvents than in polar solvents
3) MP and BP increase down group because the van der Waals forces increase as well
4) state also changes from gas to solid down group

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Volatility: Halogens change from Gas to solid as we go down the group.

Color: Color gets darker down the group.

Melting and Boiling point increase down the group as there are more number of electrons down the group so there are more london dispersion forces.

Solubility in water: solubility decreases because they are non polar and can not form bonds with hydrogen in water breaking the hydrogen bonds.

Solubility in organic solvents: Organic Solvents are non polar and halogens are non polar so halogens are soluble in organic solvents.

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volatility:
decreases down the group

solubility:
halogens are less soluble in water because they cannot form bonds to overcome the strongly bonded molecule of water.

halogens are more soluble in organic solvents (hexane) because they both are non-polar molecules.

color change in aqueous and organic solvents:
aqueous             organic
fluorine   colorless           colorless
chlorine   colorless            yellow
bromine   orange              dark -
orange
iodine       brown                purple

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1-Color change: gets darker down the group. F is the lightest in color, At is the darkest in color.
2- Volatility decreases down the group because shell size increases and has more vander walls force since more electrons as you go down.
3-Solubility in organic solvents increases because of non polar attraction and in water, it decreases because no bonds can form with water..

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The volatility decreases down the group as the number of electrons in a molecule increases which strengthens the van der waals forces between the molecules which also gives rise to high boiling and melting point as the bonds get stronger and hence require high energy to break those bonds
The halogens are insoluble in polar solvents such as H20 and soluble in organic solvents such as ethanol
The reactivity decreases.
The electronegativity decreases down the group, the atomic and ionic radius increases down the group. The colours get more darker down the group.

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Colour: Down the group, the colour gets darker.
Volatility: Decreases down the group ( as physical state goes from gas to liquid to solid at rtp). This is due to the size of the atom increasing, meaning there are more electronic shells which leads to a large number of dispersion forces, increasing the b.p.
Solubility: Halogens are partially soluble in water as there are no permanent dipole interactions and no bonds strong enough to break the hydrogen bond.
They are soluble in organic solvents as both are non polar in nature.

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The Colour Change: The colour gets darker down the group.
Volatility:
The volatility decreases down the group, this is due to the group molecules becoming larger and contain more electrons. Therefore greater forces are required
Solubility:
Solubility in water: Cannot form bonds strong enough to overcome hydrogen bond.
(soluble in organic solvents)

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VOLATILITY- decreases down the group  (change from gas to solid)
COLOR- turns darker down the group.
BOILING POINT-  increases down the group as increased size makes the induced dipole-dipole interactions rise, hence more energy required to separate the molecules
ELECTRONEGATIVITY- decreases down the group  as increasing number of shells  cause more shielding and less pull on electrons, the increasing atomic radius leads to drop in attraction as distances increases.
OXIDISING POWER- gets weaker down the group as the nucleuses attraction for the incoming electron which is affected by the rising nuclear charge which should attract the electrons more , but is interrupted by the increased shielding and atomic radius.
SOLUBILITY IN WATER- decreases as they are non polar and unable to form bonds with hydrogen
SOLUBILITY IN ORGANIC SOLVENTS- increases as organic solvents and halogens are both non polar so molecules are attracted to eachother by van der waals forces.

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1.The colours of halogens get darker as you go down the group.

2.Atomic size increases down the group because the extra shells get filled

3.Melting and boiling points also increase down the group as the strength of Van der Waals forces increases.

4.Halogens change in state from gas to liquid to solid as you go down the group.

5.Halogens act as oxidising agents and become less oxidising down the group.

6.Halogens are more soluble in organic solvents (like hexane or cyclohexane) than in water because both halogens as well as hexane are non-polar and so they are attracted by Van der Waals dispersion forces.
7. Volatility decreases down the group as atomic size increases so number of electrons increase.

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Physical Trends down the group

-Boiling points increase down the group
-Melting points increase down the group
-Volatility decreases down the group

This is because the atomic number of each halogen decreases down the group, so more electrons are present. And therefore the VanderWaal's forces between diatomic molecules increase and more energy is required to overcome the attraction.

-Colour gets darker down the group

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Confirmatory test of ppt solubility by adding aqueous ammonia needs to be included.

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Confirmatory test of ppt solubility by adding aqueous ammonia needs to be included

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Completed Worksheet

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Inorganic Chemistry of Group 17 halogens

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Pictograph/Mindmap:
Categorize the reactions of halogens to redox or disproportionation.

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Focus on real life applications of halogens and halogen compounds.

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Group 17 - qp Plenary

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Group 17 elements question paper plenary

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Mind Map Group 17

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Completed WS

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inorganic chemistry group 17 halogens ws

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Research on real life applications of Redox Titration.

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Qualitative Test for Halides and Investigating Trends in Thermal Stability of Hydrogen Halides

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Real life applications of Halogens and Halogen Compounds

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Real-life application of halogens and halogen compounds

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real-life applications of halogens and halogen compounds

FOCUS: - SDG-3

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real-life applications of halogens and halogen compounds

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research on real life application of halogens.

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real life applications of halogens

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TRENDS DOWN THE GRP
boiling point ,melting point increases and volatility decreases down the grp
atomic size increases down the grp as more shells are being filled
the color gets darker down the grp
solubility in organic solvents increases

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Qualitative test to identify halide ions