General Chemistry (Part 6)
CHEMISTRY OF GROUP 2
(2nd Partnership Task)
For grade XII students, do the following questions with your partner. Each couple must answer a question. The last submission is September 10, 2010.
Hint: Answer the following questions sharply!
Group IIA: Be – Mg – Ca – Sr – Ba – Ra
1. Solubility of bases from top to down
a) Weak bases:
b) Strong bases:
Compared with bases of Group IA, what is the basic strength of group IIA? are....
2. Reactions with water
a) Be:
b) Mg:
c) Other alkaline earth metals:
d) Reaction between Mg with oxygen (burnt in the air)
Reaction 1:
Reaction 2:
3. General chemical equation between Ca/Sr/Ba with oxygen:
4. It can react with strong bases (Amphoteric)....
Formula of its acid
Formula of its base is....
5. The only one way to produce alkaline earth metals is....
6. Definition of hard water is....
a) Temporary hard water contains....
To remove temporary hard water is....
Example of the reaction of temporary hard water removal....
b) Permanent hard water contains....
The way to remove permanent hard water is....
Example of the reaction of permanent hard water removal....
The hazard of hard water is....
7. Flame color of alkaline earth metals:
Flame color of Be....
Flame color of Mg....
Flame color of Ca....
Flame color of Sr....
Flame color of Ba....
Because of their flame colors, both alkaline metals and alkaline earth metals will be used as....
8. The strength of carbonates from top to down is....
Explanation for this trend is....
9. The strength of nitrates from top to down is....
Explanation for this trend is....
10. Solubility of sulfates from top to down
Explanation for this tend in term lattice energy and enthalpy change of hydration is....
(2nd Partnership Task)
For grade XII students, do the following questions with your partner. Each couple must answer a question. The last submission is September 10, 2010.
Hint: Answer the following questions sharply!
Group IIA: Be – Mg – Ca – Sr – Ba – Ra
1. Solubility of bases from top to down
a) Weak bases:
b) Strong bases:
Compared with bases of Group IA, what is the basic strength of group IIA? are....
2. Reactions with water
a) Be:
b) Mg:
c) Other alkaline earth metals:
d) Reaction between Mg with oxygen (burnt in the air)
Reaction 1:
Reaction 2:
3. General chemical equation between Ca/Sr/Ba with oxygen:
4. It can react with strong bases (Amphoteric)....
Formula of its acid
Formula of its base is....
5. The only one way to produce alkaline earth metals is....
6. Definition of hard water is....
a) Temporary hard water contains....
To remove temporary hard water is....
Example of the reaction of temporary hard water removal....
b) Permanent hard water contains....
The way to remove permanent hard water is....
Example of the reaction of permanent hard water removal....
The hazard of hard water is....
7. Flame color of alkaline earth metals:
Flame color of Be....
Flame color of Mg....
Flame color of Ca....
Flame color of Sr....
Flame color of Ba....
Because of their flame colors, both alkaline metals and alkaline earth metals will be used as....
8. The strength of carbonates from top to down is....
Explanation for this trend is....
9. The strength of nitrates from top to down is....
Explanation for this trend is....
10. Solubility of sulfates from top to down
Explanation for this tend in term lattice energy and enthalpy change of hydration is....
posted by wyd at
8:11 AM
22 Comments:
Name : Tiara Eka M and Varizka Amelia
Class: XII PSIA 5
(2) a) Be(s) + 2H2O(l) -> no reaction
b) Mg(s) + 2H2O(l) -> Mg(OH)2(aq) + H2(g)
c) other alkaline earth metals
Ca(s) + 2H2O(l) -> Ca(OH)2(aq) + H2(g)
Sr(s) + 2H2O(l) -> Sr(OH)2(aq) + H2(g)
Ba(s) + 2H2O(l) -> Ba(OH)2(aq) + H2(g)
Ra(s) + 2H2O(l) -> Ra(OH)2(aq) + H2(g)
reaction between Mg with oxygen (burnt in the air)
1) 2Mg(s) + O2(g) -> 2MgO(s)
2) 3Mg(s) + N2(g) -> Mg3N2(s)
Name : Dwi Hartati Izaldi & Tiara Rismala Sari
Class: XII PSIA 5
3. General chemical equation between Ca/Sr/Ba with oxygen !
Ca(s)+ 1/2 O2(g) --> CaO(s)
Sr(s) + O2(g) --> SrO2(s)
Ba(s) + O2(g) --> BaO2(s)
name : Cornellia Febri
Pratiwi Octaviani
class : XII PSIA 1
Hint: Answer the following questions sharply!
Group IIA: Be – Mg – Ca – Sr – Ba – Ra
1. Solubility of bases from top to down
a) Weak bases:
b) Strong bases:
Compared with bases of Group IA, what is the basic strength of group IIA? are....
a)Weak bases :
Be(OH)2
Mg(OH)2
Ca(OH)2
Sr(OH)2
Ba(OH)2
Ra(OH)2
b)Strong bases :
Ra(OH)2
Ba(OH)2
Sr(OH)2
Ca(OH)2
Mg(OH)2
Be(OH)2
after we compared with bases of group IA,the basic strength of group IIA are group IA.It happened because group IA is more reactive than group IIA.
name: Nisrina Qonitah
Annisa Mona Tiara
class: XII PSIA 5
answer:
5. The only one way to produce alkaline earth metals is by electrolysis of their molten earths.
Name : Astri Wahyuni and Fanny Maulidya
Class : XII PSIA 5
No. 6
Hard Water is water that contains lots of calsium ion dan magnesium ion.
a) - Temporary hard water contains bicarbonate ion (HCO3-)
- To remove temporary hard water is heating the water
- Reaction : Ca(HCO3)2(aq) → CaCO3(s) + H2O(l) + CO2(g)
b) - Permanent hard water contains chloride ion (Cl-), sulfate ion (SO42-) and (NO3-)
- To remove permanent hard water is by adding sodium carbonate Na2CO3(aq) or K2CO3 (aq)
- Reaction : CaCl2(aq) + Na2CO3(aq) →CaCO3(s) + 2NaCl(aq)
- The hazard of hard water, that are :
a) Waste of soap because hard water agglomates the soap becomes scum
b) Scum can leave spot in the clothes. So the clothes become dull
c) Hard water can cause precipitation of minerals, which is clogging the pipes and taps.
Name :Muhammad Qisthy & Sandi Fadila
Class: XII PSIA 5
no. 4 Group IA (group 1)
1. Fransium (Fr)
2. Alkaline is the most reactive metal. All of alkaline metal will react with water (Li,K,Rb,Cs). except Fransium (Fr), because it's radioactive metal which does not react with water.
name : Miranda Kartika sari and Rininta Amelia
class : XII PSIA 1
7. Flame color of alkaline earth metals:
Flame color of Be is colorless
Flame color of Mg is colorless
Flame color of Ca is brick-red
Flame color of Sr is red
Flame color of Ba is green
Because of their flame colors, both alkaline metals and alkaline earth metals will be used as give color to the fireworks.
Name: Afie Andisa
4. Can react with strong bases (amphoyteric): (Be). Because (Be) is can be react with both acid and base. And it character is amfoter.
Formula of its acid:
Be + 2H(+) -> Be(2+) + H2
Formula of its base:
Be + 2OH(-) -> BeO2(2-) + H2
name : kenny shafira diaz & mirna gusrtiana
7. Flame color of alkaline earth metals:
Flame color of Be is colorless
Flame color of Mg is colorless
Flame color of Ca is brick-red
Flame color of Sr is red
Flame color of Ba is green
Because of their flame colors, both alkaline metals and alkaline earth metals will be used as give color to the fireworks.
Name : Ferdi Aprilian Putra & Hasda Gustiansyah
Class : XII PSIA 5
Base Strongest
Group IA : Li, K , Rb, Cs, Fr
answer :
LiOh
KOH
RbOH
CsOh
FrOH
because the ionization rates from Li to Fr consequently the smaller the easier it release electrons, redukor, the more reactive and basic character increases
Name : M.Ramadhan & Redhi Rizki Pratama
Class : XII.IA 5
Solubility of Bases from top to down: Be - Mg - Ca - Sr - Ba - Ra
a) weak bases : Be(OH)2, Mg(OH)2
b) Strong bases : Ca(OH)2 , Ba(OH)2, Sr(OH)2
Compared Bases of Group IA and IIA : Bases of Group IA is stroenger than IIA. because Bases of Group IA is more reactive then IIA.
Name : Ferdi Aprilian Putra & Hasda Gustiansyah
Class : XII PSIA 5
Base Strongest
Group IA : Li, K , Rb, Cs, Fr
answer :
CsOH
RbOH
KOH
LiOH
because the ionization rates from Li to Fr consequently the smaller the easier it release electrons, redukor, the more reactive and basic character increases
the answer no 8:
name : M.Rifki Ali and Nella Febriani
class: XII PSIA 5
Solubility :
the solubility of alkaline earth ions with carbonates is hard be dissolved.
for example :
Mg ions + carbonates has the constant solubility 1x10^-15
Name : Dwi Hartati Izaldi & Tiara Rismala Sari
Class : XII PSIA 5
9. The strength of nitrates from top to down is...
Be-Mg-Ca-Sr-Ba
Explanation for this trend is....
Be has amount of electron less than other. Because of that, Be has orbital less than other, so the radius is shorter. Shorter the radius, stronger the bond. Ra is hard to make a bond with nitrate because Ra is a radioactive.
Nama:Herlambang bagus S & Redho rizky pratama
kelas : XII IPA 2
7. Flame color of alkaline earth metals :
Flame color of Be is colorless
Flame color of Mg is colorless
because beryllium and Magnesium have ionization energies that are very high.So The energy of a burner flame is not sufficient to excite their electrons to higher energy levels
Flame color of Ca is brick red
Flame color of Sr is Crimson red
Flame color of Ba is Grassy Red
because of their flames,both alkaline metals and alkaline earth metals will be used as give characteristic color to the flame.
thanks
feranika & Fitri Hidayati
XII PSIA 3
Question 3 :
General chemical equation between Ca/Sr/Ba with oxygen,
Ca(s)+ 1/2 O2(g)-> CaO(s)
Sr(s) + 1/2 O2(g) → SrO(s)
Ba(s) + O2(g)-> BaO2(s)
name : Maulia Wisda Era C & R A Delila Tsniyah
class : XII PSIA 2
7. Flame color of alkaline earth metals:
Flame color of Be is colorless
Flame color of Mg is colorless
Flame color of Ca is brick-red
Flame color of Sr is red
Flame color of Ba is green
Because of their flame colors, both alkaline metals and alkaline earth metals will be used as give color to the fireworks.
name : rizka intan yolanda and yustia tafarani
class ; xii psia 4
7. Flame color of alkaline earth metals:
Flame color of Be is colorless
Flame color of Mg is colorless
Flame color of Ca is brick-red
Flame color of Sr is red
Flame color of Ba is green
Because of their flame colors, both alkaline metals and alkaline earth metals will be used as give color to the fireworks and give characteristic color to the flame.
name:Ishlah Amanda and Ika Puspitasari
class:XII PSIA 4
Question 3 :
General chemical equation between Ca/Sr/Ba with oxygen,
Ca(s)+ 1/2 O2(g)-> CaO(s)
Sr(s) + 1/2 O2(g) → SrO(s)
Ba(s) + O2(g)-> BaO2(s)
buat rizka intan yolanda..
Thanks for sharing this nice and miracle information.
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