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4P+ 5O2\(\xrightarrow[]{to}\) 2P2O5
P2O5+ 3H2O\(\rightarrow\) 2H3PO4
H3PO4+ K2HPO4\(\rightarrow\) KH2PO4
KH2PO4+ KOH\(\rightarrow\) K2HPO4+ H2O
KOH+ K2HPO4\(\rightarrow\) K3PO4+ H2O
2K3PO4+ H3PO4\(\rightarrow\) 3K2HPO4
6K+ 2H3PO4\(\rightarrow\) 2K3PO4+ 3H2
2K3PO4+ 3H2SO4\(\rightarrow\) 3K2SO4+ 2H3PO4
- CaCl2
Gọi hóa trị của Ca là a
Theo quy tắc hóa trị ta có:
\(a\times1=I\times2\)
\(\Leftrightarrow a=2\)
Vậy hóa trị của Ca là II
- AlPO4
Gọi hóa trị của Al là b
Theo quy tắc hóa trị ta có:
\(b\times1=III\times1\)
\(\Leftrightarrow b=3\)
Vậy hóa trị của Al là III
- KH2PO4
Gọi hóa trị của K là c
Theo quy tắc hóa trị ta có:
\(c\times1=I\times1\)
\(\Leftrightarrow c=1\)
Vậy hóa trị của K là I
CaCl2
Theo quy tắc hóa trị, ta có: a.1 = I.2
=> a= 2
Vậy: Ca hóa trị II
AlPO4
Theo quy tắc hóa trị, ta có:
a.1 = III.1 => a = 3
Vậy: Al hóa trị III
KH2PO4
Theo quy tắc hóa trị, ta có:
a.1 = I.1 = > a = 1
Vậy: K hóa trị I
1, (1) 4P+5O2----(to)--> 2P2O5
(2)P2O5 + 3H2O --> 2H3PO4
(3)H3PO4 + NaOH ----> NaH2PO4 + H2O
(4)NaH2PO4 + NaOH ----> Na2HPO4 + H2O
(5)Na2HPO4 + NaOH----> Na3PO4 + H2O
(6) 2Na3PO4+ 3H2SO4--->3Na2SO4+ 2H3PO4
(7)H3PO4+3NaOH--> 3H2O+ Na3PO4
(1) : \(4P+5O_2\rightarrow2P_2O_5\)
(2) : \(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
(3) : \(NaOH+H_3PO_4\rightarrow NaH_2PO_4+H_2O\)
(4) : \(NaH_2PO_4+NaOH\rightarrow Na_2HPO_4+H_2O\)
(5) : \(Na_2HPO_4+H_3PO_4\rightarrow2NaH_2PO_4\)
(6) : \(Na_2HPO_4+NaOH\rightarrow Na_3PO_4+H_2O\)
(7) : \(Na_3PO_4+NaH_2PO_4\rightarrow2Na_2HPO_4\)
(8) : \(H_3PO_4+3NaOH\rightarrow Na_3PO_4+3H_2O\)
(9) : \(Na_3PO_4+3HCl\rightarrow3NaCl+H_3PO_4\)
Kate Festival is (1)............. by the Cham people for 3 days at the beginning of October. This event is held in a large space in the three Champa Tower (Po Nagar, Po Klong Garai and Po Rome). The main purpose of the festival is to (2)................. their heroes like Po Klong Garai and Po Rome. (3)............, the festival is the chance for the local people to relax, to meet and wish one another (4)................ in the future.
This is one of the biggest and most important events of the Cham people in Vietnam. (5)..................., it is a good opportunity for the visitors to explore the (6).............. in the Cham culture, from architecture to costumes, instruments and traditional songs that are used to praise their kings in the past. The Kate festival in each tower starts at the same time, and the day after, villagers and families begin to hold their own rites. During the rites, the people (7)............... their ancestors and gods with the help of a shaman, and then pray (8)...................health and prosperity. The actual festival (9).................... after the rites. It is a combination of traditional music and dance, including some activities (10) ..........................performances of Ginang Drum and Saranai Flute or the traditional dance of Cham girls.
1. A. organize B. organized C. hold D .being held
2. A. commemorate B. see C. watch D. love
3. A. However B. Nevertheless C. Therefore D. Moreover
4. A. lucky B. happy C. fortune D. dream
5. A. However B. Therefore C. Because D. Although
6. A. beautiful B. beautifully C. charm D. charming
7. A. call B. ask C. shout D. speak
8. A. to B. about C. of D. for
9. A. take place B. take places C. take part D. take the place
10. A. such B. so C. like D. like as
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