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HL
3
NL
1
27 tháng 1 2021
Câu 4:
PTHH: \(NaBr+AgNO_3\rightarrow NaNO_3+AgBr\downarrow\)
a) Ta có: \(n_{AgBr}=\dfrac{37,6}{188}=0,2\left(mol\right)=n_{NaBr}\)
\(\Rightarrow\%m_{NaBr}=\dfrac{0,2\cdot103}{42,6}\cdot100\%\approx48,37\%\) \(\Rightarrow\%m_{NaF}=51,63\%\)
b) Ta có: \(\Sigma n_{AgNO_3}=\dfrac{850\cdot1,09\cdot10\%}{170}=0,545\left(mol\right)\)
\(\Rightarrow n_{AgNO_3\left(dư\right)}=0,345\left(mol\right)\) \(\Rightarrow m_{AgNO_3\left(dư\right)}=0,345\cdot170=58,65\left(g\right)\)
Theo PTHH: \(m_{NaNO_3}=0,2\cdot85=17\left(g\right)\)
Mặt khác: \(\left\{{}\begin{matrix}m_{NaF}=42,6-0,2\cdot103=22\left(g\right)\\m_{dd}=m_{hh}+m_{ddAgNO_3}-m_{AgBr}=931,5\left(g\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}C\%_{AgNO_3\left(dư\right)}=\dfrac{58,65}{931,5}\cdot100\%\approx6,3\%\\C\%_{NaF}=\dfrac{22}{931,5}\cdot100\%\approx2,36\%\\C\%_{NaNO_3}=\dfrac{17}{931,5}\cdot100\%\approx1,83\%\end{matrix}\right.\)
28 tháng 1 2021
Em từng nghe là vì chưa biết HCl dư hay hết nên không được dùng ngay số mol của HCl , với cả đề còn dữ kiện 11,2l khí chưa đc khai thác
3 tháng 7 2016
đề nà bạn làm đi
1) languages / many / can / speak / How / your daughter / foreign / ?/
2)insted / a / bikes / of / walk / We / riding / take / . /
3)He is a stamp _ _ _ _ _ _ _ _ _ _ .
4)She writes _ _ her grandparents quite often.
5)................. always begin at 7:00 and finish at11:20(Countries ; Machines ; Classes ; Vacations)
6)Thomas is a naughty boy.He ..................................a lot of noise in the class.(always
makes ; is making always ; always is making ; is always making)
7)have / so / country / is / green / very / of / We / rain / lots / the / . / , /
8) it / hot / and / people / fell / thiristy / is / When / tired / often / , / . /
9)She often cooks dinner for _ _ _ _ _ _ _ _ people.
10)Hurry up! _ _ you will be late for school.
11)Welcome.......... our town.We're glad to see you.(to ; in ; for ; at)
12)Which sentence is correct?(He is never late for school ; He never is late for school ; He is late never for school ; He is late for school never)
13) I like English .............. much.
14) people / forests / destroying / burning / plants / These / the / and / are / . /
15) good / thinks / she / he / a / teacher / is / . /
16)Can I speak _ _ Mai?-I'm sorry.She is out.
17)Nam _ _ _ _ _ _ _ listening to music to going to the concert.
18)Will your father be home _ _ _ dinner tonight?(to ; have ; for ; of)
19)We / time / of / home / and / at / at / school / learning / our / spend / most / . /
20) now / I / can't / out / for / a / go / walk
21)How ____ does it take you to get to the nearest hospitala?
22)She ____ aerobics and plays badminton everyday.
23)When ........ you have a summer vacation?(should ; do ; are ; must)
24) take / jogging / only / in / club / part / I
25) is / make / big / birthday / to / going / Her sister / tomorrow . / for / her / cake / a /
26)Are there___ apples?-Yes,there are
27)He is a slower and ____ careful driver than I am
28)Nam's father usually.........pigs and chickens every morning.(collects ; feeds ; works ; grows)
29)You shouldn't stay __ bed all day.It's not good for your health.(in ; at ; on ; to)
30) going / stay / am / at / best / I / to / my / house / for / friend's / 2 weeks /
31) tomorrow / I / to / visit / of / going / am / London / the / . / Tower
32) " 06:20" / " It's twenty past six " / say / We / and / we / write .
33)How _____ visiting Blue Angal shop?There is possibly someing interesting to give Mary on her birthday.
34)We usually __ to the library three times a week.But last week we went twice.
35)Do these things to ............ a healthy body.(have ; having ; have to ; to have)
36) now / need / You / and / to / the / go / doctor . / see
37) children / skiing / winter / every / go / My / .
38)What's your new phone ______ ?-078983250983
39)He looks different ............. his mother.(to ; at ; from ; by)
40) sister / My / walking / lakes / around / the / like / in the moring / .
41)Do you like ____ food?-No,I don't.
42)She is Frence.Mai's father is a good friend of .................(she ; her ; hers ; she's)
43)A __________ makes clothes for people.
44)Her eyes are very beautiful. ____ are brown.
45)Mai:".................. your close friend's names?"-Nga:"They are Phong and Lan"
(What are ; What is ; Who ; Who are)
46)Would you like to have breakfast ____ eggs?
47)Choose the word that has the underlined part pronounced differently:
camera capital basketball warm
48)How ___ is it from the school to the market?
49)The train __ Ha Noi will leave at 7.30 tonight.
50)What ..................... in her free time?-She reads books.(she does often ; does she often do ; does she do often ; is she doing often)
51)These people don't have houses.They are ................ (houseless ; homeless ; difficulty ; trouble)
52)Mary women in Viet Nam often stay at home to take care of the house and look .................. their children.
53)I ................... ,ask your friends about their family.(a 3 group ; a group of 3 ; a group 3 ; a group 3 of)
54)Because Jim is _____ - sighted,he can't read what is on the boards.
55)You need ........... to send letters to people at the post office.(postcard ; stamps ; coins ; writting pads)
56)I'm back _______ school.I'm hungry.
57)Mr.Brown often ________ clean-up campaigns.
58)What's wrong ................. you?-I have a bad cold.(to ; of ; for ; with)
59)What should we do this _______ ?
60)We have graphs,equations,calculartors in ...........(Maths ; Art ; Music ; Literature)
61)How much does a parcel to France ............... ?(is ; are ; cost ; take)
62) If you...........(to help) your grandma, I...........(to do) the shopping.
63) Andrew...........(to water) the flowers if he...........(to stay) at home.
64) If she...........(to have) 5 pounds more, she...........(to buy) herself this T-shirt.
65) If they...........(to offer) me the job, I...........(to take) it.
66) You...........(to have) summer holidays from June till August if you...........(to live) in the USA.
67) We...........(to sell) the bike for 20 Euros if Ron...........(to repair) it.
68) If you...........(to use) a pencil, the drawing...........(to be) perfect.
69) The children...........(to be) happy if he...........(to teach) them English.
70) If Ireen...........(to visit) us, we...........(to go) out tonight.
71)Pick out the word that has main stress on a different syllable from the rest.
A : pollute B : energy C : pollution D : recycling
72)Choose the word whose underlined part is pronounced differently from others.
university pollute popular reuse
73)Mr. Smith is .......... English teacher.
A. our B. us C. we D. you
74)As a teenager, George spent summers abroad ……… the business.
A. to learn B. learn C. learning D. learnt
75)The sun ......... in the east, and sets in the west.
A. rise B. rises C. rose D. rosen
76)We were early enough .......... good seats.
A. to get B. get C. getting D. got
77)I don't think I'll go .......... now. It's too cold.
A. outdoors B. inside C. outside D. A & C
78)She speaks English ..........
A. fluent B. fluently C. easy D. good
79)Nhung loves .......... her mother cook meals in her free time.
A. help B. helping C. to helping D. helps
80)Mary's an excellent student and her parents are always proud ......... her.
A. of B. to C. from D. for
81)Yesterday, Mrs. Hong Nguyen ............. Ho Chi Minh City.
A. visits B. visit C. visiting D. visited
82)............ are twenty members in our sports club.
A. These B. There C. Them D. Their
83)What is Mary ........... today?
A. wear B. wearing C. to wear D. wore
84)Look at ........ big clouds in the sky. It's going to rain.
A. those B. these C. this D. that
85)Do you see the sports news program ....... 8 o'clock on TV?
A. in B. on C. at D. of
86)......... does she go to the cinema?
A. How many B. How often C. How long D. How far
87)Ho Chi Minh City is .... biggest city in Vietnam.
A. a B. an C. the D. this
88)George, the eldest of four brothers, was brought ……… in London in a Greek shipping family.
A. about B. up C. off D. down
89)Tam Cam is always one of the famous ......... that many children read today.
A. clubs B. books C. pictures D. folktales
90)Unless you need more space, this small car .......... big enough for one person.
A. was B. were C. would be D. is
91)They pretended .......... out on the town when in fact they were at home.
A. being B. to being C. to be D. be
92)He describes .......... as an inventor, an ideas man.
A. him B. he C. himself D. his
93)......... used correctly, the Internet can be a very powerful tool.
A. Unless B. Since C. If D. Though
94)He died in 1882, ...... the age of 74, at his home on a small island off Sardinia.
A. at B. from C. in D. by
95)Additionally, to turn ..... the computer, you will have to enter a login name and password.
A. up B. down C. on D. in
96)After I graduate, I .......... medical school and become a doctor. I have wanted to be a doctor all my life.
A. am attend B. attend C. will attend D. will have attended
97)Taiwan is well-known all over the world for being densely populated and highly ............
A. industry B. industrial C. industrialize D. industrialized
98)After I found the wallet full of money, I .......... to the police and turned it in.
A. was immediately going
B. had immediately gone
C. immediately went
D. have immediately gone
99)Candida and the children became increasingly .........., and eventually Candida had no choice but to ask for a divorce.
A. frightened B. frightening C. frighten D. fright
100) My grandfather does morning exercises regularly ............ improve his health.
A. so as for B. so as that C. in order that D. so as to
LT
8 tháng 2 2018
Tuấn sẽ nói với Quang: Đọc sách “Người tốt, việc tốt” để thêm ví dụ minh họa cho bài học, bài kiểm tra. Vì sách “Người tốt, việc tốt” là loại sách rất bổ ích đối với học sinh. Tranh thủ đọc, liên hệ với bản thân để rèn luyện.
TN
1
UT
31 tháng 12 2021
Bạn tham khảo nhé!
Khi dùng bút thử điện để kiểm tra dây pha và dây trung tính ta thấy:
– Đèn ở bút thử điện chỉ sáng khi ta tiếp xúc bút thử điện với dây pha (còn gọi là pha nóng,pha lửa hay ở Nam bộ thường gọi là dây nóng).
– Nếu đèn ở bút thử điện đều sáng khi tiếp xúc bút thử điện với dây pha hoặc dây trung tính thì nguồn điện ấy có vấn đề,phải kiểm tra nguồn ngay tránh gây nguy hiểm khi sử dụng điện.
25 tháng 2 2019
gọi điểm kiểm tra học kì của Tiến để đạt được hsg là x ( x>0) \(\Rightarrow\)theo đầu bài ta có tổng hệ số là 13 nên ta có phương trình sau :
\(\frac{9+9+9+6+8.2+8.2+9.2+3x}{13}\)= \(8\)
\(\Rightarrow\)75 + 3x = 104
\(\Rightarrow\)3x = 29
\(\Rightarrow\)x sấp sỉ 10 điểm thì thỏa mãn đk ủa ẩn và giúp điểm phảy trung bình của Đạt đạt loại giỏi
17 tháng 10 2019
Gọi số điểm 4 bài đầu là a, điểm bài cuối là b
\(\Rightarrow\hept{\begin{cases}a,b\inℕ\\a,b\le100\\\frac{4a+b}{5}=82\end{cases}\Leftrightarrow4a+b=410}\)
Lại có \(\hept{\begin{cases}a\le100\Rightarrow b\ge10\\410\equiv2\left(mod4\right),4a⋮4\end{cases}\Rightarrow\hept{\begin{cases}10\le b\le100\\b\equiv2\left(mod4\right)\end{cases}}}\)
\(\Rightarrow b\in\left\{10;14;18;...;94;98\right\}\)
Số điểm kiểm tra cuối của Laila có thể nhận số giá trị là:
\(\left(98-10\right):4+1=23\left(gt\right)\)
vậy ...
17 tháng 10 2019
Có 5 đáp án cho sẵn của bài là:
(A)4 (B)5 (C)9 (D)10 (E)18
Đè thi thử AMC 8 2018