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Bài 1:
\(a,Magnesium+Oxygen\xrightarrow{t^o}Magnesium Oxide\\ b,m_{Mg}+m_{O_2}=m_{MgO}\\ c,m_{O_2}=m_{MgO}-m_{Mg}=15-9=6(g)\)
Bài 2:
\(a,Sulfur+Oxygen\xrightarrow{t^o}\text {Sulfur dioxide}\\ b,m_{S}+m_{O_2}=m_{SO_2}\\ c,m_{O_2}=m_{SO_2}-m_{S}=6,4-3,2=3,2(g)\)
Bài 3:
\(a,zinc+\text{hydrochloric acid}\to \text {zinc chloride}+hydrogen\\ b,m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ c,m_{HCl}=m_{ZnCl_2}+m_{H_2}-m_{Zn}=13,6+0,2-6,5=7,3(g)\)
a) nAl= 0,2(mol)
PTHH: 4Al + 3 O2 -to-> 2 Al2O3
nO2= 3/4 . 0,2= 0,15(mol)
=>V(O2,đktc)=0,15.22,4=3,36(l)
Vkk(đktc)=5.V(O2,đktc)=3,36.5=16,8(l)
b) nAl=0,2(mol)
nO2=0,4(mol)
Ta có: 0,2/4 < 0,4/3
=> Al hết, O2 dư, tính theo nAl.
- Sau phản ứng có O2(dư) và Al2O3
nAl2O3= nAl/2= 0,2/2=0,1(mol)
nO2(dư)= 0,4- 0,2. 3/4=0,25(mol)
\(13.A\\ 24.kí.hiệu?\\ 25.C\\ 26.D\\ 27.C\\ 29.D\\ 30.B\\ 31.B\\ 32.V=1,5.24,79=37,185l\\ \Rightarrow D\\ 33.D\\ 34.n_{O_2}=\dfrac{64}{32}=2mol\\ V_{O_2}=2.24,79=49,58l\\ \Rightarrow B\\ 35.d_{SO_2/Cl_2}=\dfrac{61}{71}\approx0,9\\ \Rightarrow C\\ 36.m_{H_2SO_4}=\dfrac{200.12}{100}=24g\\ \Rightarrow C\\ 36.A\\ 39.n_{HCl}=0,2.1=0,2mol\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=0,2:2=0,1mol\\ m=m_{Zn}=0,1.65=6,5\\ V=V_{H_2}=0,1.22,4=2,24l\\ \Rightarrow A\)
Science and technology has become a debated topic in the society. On one hand, it is necessary for the modern life where other countries are continuously developing in the field of science and technology. It becomes very necessary for other countries too to grow in the same way to be strong and well developed other countries for the future safety and security. It is science and technology which helps other weak countries to develop and be strong. We have to take support of science and technology forever to improve the way of life for the betterment of mankind. If we do not take the help of technologies such as computer, internet, electricity, etc we cannot be economically strong in the future and would be backward forever even we cannot survive in such a competitive and technological world.
Advancement in the field of medical, agriculture, education, economy, sports, games, jobs, tourism, etc are the examples of science and technology. All such advancements show us that how both are equally beneficial for our life. We can see a clear difference in our life style while matching the ancient and modern way of life. High level of scientific and technological advancement in the field of medicine has made easy the treatment of various lethal diseases which was earlier not possible. It has helped a lot to the doctors to find effective ways to cure diseases through medicine or operations as well as research vaccines to cure diseases such as cancer, AIDS, diabetes, Alzheimer’s, Leukemia, etc.
\(n_{Na}=\dfrac{m}{M}=\dfrac{4,6}{23}=0,05\left(mol\right)\\ số.nguyên.tử.là:n.6.10^{23}=0,05.10^{23}=0,3.10^{23}\cdot\left(nguyên.tử\right)\)
\(n_{CO_2}=\dfrac{V_{\left(đktc\right)}}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ số.phân.tử.là:n.6.10^{23}=0,15.6.10^{23}=0,9.10^{23}\left(phân.tử\right)\)
28. Ca(OH)2 + 2HCl \(\rightarrow\) CaCl2 + 2H2O
29. Ca (OH)2 + H2SO4 \(\rightarrow\) CaSO4 + 2H2O
30. Ca(OH)2 + Na2CO3 \(\rightarrow\) 2NaOH
32. Na2S + 2HCl \(\rightarrow\) 2NaCl + H2S
33. 2K3PO4 + 3Mg(OH)2 \(\rightarrow\) 6KOH + Mg3(PO4)2
36. 2Al(OH)3 + 3H2SO4 \(\rightarrow\) Al2(SO4)3 + 6H2O
37. Al(OH)3 + 3HCl \(\rightarrow\) AlCl3\(\downarrow\) + 3H2O
40. KNO3 \(\rightarrow\) KNO2 + O2
Công thức | Phân loại | Gọi tên | |
Na(I) | \(Na_2^IO^{II}\) | Oxit bazo | Natri oxit |
K(I) | \(K_2^IO^{II}\) | Oxit bazo | Kali oxit |
N(I) | \(N_2^IO^{II}\) | Oxit axit | Đinito oxit |
Mg(II)
| \(Mg^{II}O^{II}\) | Oxit bazo | Magie oxit |
Zn(II) | \(Zn^{II}O^{II}\) | Oxit bazo | Kẽm oxit |
N(V) | \(N^V_2O^{II}_5\) | Oxit axit | Đinito pentaoxit |
N(II) | \(N^{II}O^{II}\) | Oxit axit | Nito oxit |
N(IV) | \(N^{IV}O^{II}_2\) | Oxit axit | Nito đioxit |
Vì em học lớp 8 mới có 2 loại oxit axit, oxit bazo nên anh xếp như này nhé! Sau này lớp 9 em sẽ thấy ZnO là oxit lưỡng tính, NO là oxit trung tính,..
K (I) :
ct : K2O ; phân loại : oxit axit ; gọi tên : Kali oxit
N(I) : N2O : phân loại : oxit trung tính ; gọi tên : dinitơ monoxide
N ( II) NO ; phân loại : oxit trung tính ; gọi tên ; nitơ monoxide
Mg(II) : MgO ; phân loại : oxit bazơ ; gọi tên : Magie oxide
Zn(II) ; ZnO ; phân loại ; oxit lưỡng tính ; gọi tên Kẽm oxide
N (IV) NO2 : phân loại : oxit axit ; gọi tên : Đioxide nitơ
1.
a, \(Natri+sulfuric\:acid\rightarrow Natri\text{ }sulfat+Hidro\)
b, PTHH: \(2Na+H_2SO_4\rightarrow Na_2SO_4+H_2\uparrow\)
Câu 1:
\(a,\) sodium + sulfuric acid ---> sodium sulfate + hydrogen
\(b,2Na+H_2SO_4\to Na_2SO_4+H_2\)
Câu 2:
\(a,\) iron sulfate + barium chloride -----> barium sulfate + iron chloride
\(b,Fe_2\left(SO_4\right)_3+3BaCl_2\to3BaSO_4\downarrow+2FeCl_3\)