AS Chemistry Group 2

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What is the relationship between ionisation energy and Group 2 elements?

As you go down group 2, ionisation energy decreases.
Why does Ionisation energy decrease as you go down group 2? (2 marks)
- Electron on the outer shell are further away from the nucleus so the effect of the strong nuclear force is reduced.
- More shielding due to extra inner shells as you move down a group.
What are the products of group 2 elements with water and what the general equation? ( 3 marks)
- M _(S)+ 2H₂O _(l)→ M(OH)_{2 (aq)}+ H_{2 (g)}
- Hydrogen
- Metal hydroxide
What is the trend of re-activity of group two elements with water and why are they like this? Which group 2 metal doesn't react with water?(3 marks)
- Reactivity increases as you go down the group.
- This is because the ionisation energies decrease as you go down the group
- Berylium
Why doesn't Beryllium react with water?

Because of thick oxide layer on the surface of the metal.
What is the product of group 2 elements with oxygen and what is the general equation for this?
- Metal oxides
- 2M_(s)+ O2 (g) → 2MO_(S)
What causes coloured flame in flame test?

Electrons emitting a photon when returns to it ground state
What a more accurate device to measure a flame test and how does it work and what is it used for? (3 marks)
- A flame photometer
- Measure the wavelength of the emitted light as it corresponds to a colour
- Used to find the level of Na⁺and K⁺ ions
What is the trend of reactivity of group 2 metals with oxygen?

As you go down the group reactivity increases.
What is the product of group 2 elements with chlorine gas and what the general equation for this? (2 marks)
- Metal chlorides
- M_(S) + Cl_2(g) → MCl_2(s)
What is the trend of reactivity of group 2 metals with chlorine?

As you go down the group reactivity increases.
What is the product of group 2 oxides and water ;what the general equation; what is the implication of the reaction and why as well as what group 2 oxide is an exception and what the trend of solubility of metal oxide and why? (2 marks)
- Metal hydroxide
- MO_(S)+ H₂O_{_(l)} → M(OH)_2(aq)
- A strong alkaline solution is produced due to the strong OH^-ions
- Magnesium oxide - reacts slowly
- Solubility increases as you go down the group
- because the hydroxides get more soluble
What is the product of group 2 oxides and hydrochloric acid and what is the general equation for this? (2 marks)
- Chloride salt and water
- MO_(s)+2HCl_(aq)→ MCl₂_(aq)+H₂O_(l)
What is the product of group 2 oxides and dilute nitric acid and what is the general equation for this? (2 marks)
- nitrate salt and water
- MO_(s)+2HNO_3(aq)→M(NO₃)_2(aq)+H₂O_(l)
What are oxides and hydroxides and what implication does this have? (2 marks)

They are bases so can neutralise dilute acids.
What is the product of group 2 hydroxides and dilute hydrochloric acid and what is the general equation for this?(2 marks)
- group 2 metal chloride and water
- M(OH)_2(S)+ 2HCl (aq) → MCl_2(aq)+2H₂O_(l)
What is the product of group 2 hydroxides and dilute nitric acid and what is the general equation for this?(2 marks)
- group 2 metal nitrate and water
- M(OH)_2(S)+2HNO_{_3(aq)} → M(NO₃)_2(aq)+2H₂O_(l)
What is the general equation of group 2 metals and sulphate;what is the trend for group 2 sulphate and which group sulphate is insoluble?(2 marks)
- M+ H₂SO₄→ MSO₄+ H₂
- Group 2 sulphate solubility increases as you go up the group.
- Barium Sulphate
What the relationship between group 2 elements and carbon cations? ( 2 marks)
- Compounds of group 2 elements that contain singly charged negative ions (e.g OH^-)increase solubility down the group.
- Compounds of group 2 elements that contain doubly charged negative ions (e.g SO₄^2-) increase solubility up the group.

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AS Chemistry Group 2

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AS Chemistry Unit 2

Updated

2016-01-17T00:41:28Z

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