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1) Cho khoi luong cua cac nguyen tu sau, tinh khoi luong nguyen tu moi nguyen to theo don vi u

- Nguyen tu Na (38.10^-24g) - Nguyen tu H ( 1,67.10^-24g)

2) Cho biet khoi luong nguyen tu cua: Ca la 40u, N la 14u, Fe la 56u. Tinh khoi luong cac nguyen tu tren theo don vi kg

3) Nguyen tu sat gom 26p, 30n, 26e

a. Tinh khoi luong tuyet doi cua nguyen tu sat theo don vi gam

b. Tinh khoi luong electron co trong 1kg sat

4) Biet rang 1 nguyen tu Fe co 26p, 26e 30n va khoi luong mol nguyen tu cua Fe la 56g/mol

a. Hay cho biet 1 mol Fe co bao nhieu gam electron

b. Tinh so nguyen tu Fe co trong 280g sat

c. Tinh khoi luong electron co trong 280g sat

5) Trong 1,5kg dong co bao nhieu gam electron? Cho biet 1 mol nguyen tu dong co khoi luong bang 63,546 gam, mot nguyen tu dong co 29e

6) Tinh khoi luong cua cac nguyen tu sau theo don vi u va kg: Mangan (25p, 30n) va Kali ( 19p, 20n)

7) Gia su nguyen to co kich thuoc nhu Trai Dat ( co ban kinh khoang 6400km) Hay tinh gan dung ban kinh hat nhan cua nguyen tu do

8) Nguyen tu sat co ban kinh nguyen tu la 1,28 angstron va M= 56u. Tinh khoi luong rieng cua nguyen tu Fe theo g/cm³

9) Nguyen tu kem co ban kinh la 1,35.10^-1nm, co khoi luong cua nguyen tu la 65u

a. Tinh khoi luong rieng cua nguyen tu kem theo g/cm³? Biet V hinh cau =\(\frac{4}{3}.\pi r^3\)

b. Thuc te hau nhu toan bo khoi luong nguyen tu tap trung o hat nhan voi ban kinh = 2.10^-6nm. Tinh khoi luong rieng cua hat nhan nguyen tu kem

10) Khoi luong rieng cua dong la 8,9g/cm³ va nguyen tu khoi cua dong la 64u. Trong tinh the dong thi cac nguyen tu la nhung hinh cau chiem 74% the tich tinh the, phan con lai la cac khe rong. Tinh ban kinh gan dung cua nguyen tu dong

11) Khoi luong rieng cua canxi kim loai la 1,55 g/cm³. Gia thiet rang, trong tinh the canxi cac nguyen tu la nhung hinh cau chiem 74% the tich tinh the, phan con lai la khe rong. Tinh ban kinh nguyen tu canxi tinh theo li thuyet

Cau 1 : cho 3 duong thang doi 1 cat nhau tao thanh 3 giao diem phan biet .Hoi co bao nheu tia co goc la 1trong 3 giao diem do
Cau 2: Ve n tia phan biet chung gốc  . Biet rang tren hinh co 36 góc .Tìm n
Cau 3: tim p/s bang 20/39 .Biet UCLN cu tu va mau nau bang 36
Cau 4 : Tap hop gia tri x thoa man |x+3|+|x+4|=1
Cau 5: Trong 1 buoi giao luu van nghe , h/s nu chiem 2/5 ,trong do co 3/8 la h/s lop 6.Trong so h/s nam co 2/9 la hoc sinh lop 6. Tinh so h/s lop 6 .Biet so h/s trong khoang tu 130 den 200
Cau 6: ti so cu hai so bang 2:7 neu them 35 vao so thu 1 thi ty so giua 2 so =11:14. Tinh so > hon
Cau 7 : So phan tu cua tap hop x thoa man

11-x+|x+2|=0
cau 8: 1 o to di quang duong AB voi van toc 40km/h luc ve di voi van toc 50 km/h . Time ca di lan ve =4h30 .tinh AB
Cau 9 : Can it nhat bao nhieu diem de khi noi lai ta duoc 4hinh tam gia    

Minh viet tat nen hoi kho doc
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