Summary of chemistry knowledge in senior one

The test of sulfate ion: BaCl2 + Na2SO4 = BaSO4 ↓ + 2nacl 2, the test of carbonate ion: CaCl2 + Na2CO3 = CaCO3 ↓ + 2nacl 3, the reaction of sodium carbonate with hydrochloric acid: Na2CO3 + 2HCl = 2nacl + H2O + CO2 ↑ 4, charcoal reduction

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1. two 3. All the important concepts and examples of senior one chemistry (such as isomers...)
2. All the calculation formulas of senior one chemistry Some important ones will do Calculation formula
3. A summary of the formula of physics compulsory one in senior one
4. A summary of the units, symbols and formulas of compulsory one and compulsory two in senior high school physics As long as you don't use these concepts, you're going to have to take an exam,
5. Summary of the formula of gravitation in Physics
6. The story about the mathematician Gauss is about 150 ~ 200 words
7. What are the stories about the mathematician Gauss? Medium number of words! 5 best!
8. Let n be a positive integer, try to explain the reason why the power of N + 2 of 2 + 7 can be divided by 5
9. Let n be a positive integer, try to explain the reason why the power of N + 2 of 2 + 7 can be divided by 5
10. Students, have you heard the story of the mathematician Gauss when he was a child? Do you know how he calculated 1 + 2 = ·· + 99 + 100 = 5050 at once It's due tomorrow
11. The formula of circumference
12. A formula for finding the circumference of a circle?
13. Calculation formula of circumference
14. Calculation formula of circumference Radius, diameter, multiplication or division? Forget all about it. Don't use symbols. You can't understand it
15. Complete the following calculation: 1 + 3 =? 1 + 3 + 5 +? Summary formula
16. 1 + 3 = (1 + 3) * 2 / 2; 1 + 3 + 5 = (1 + 5) * 3 / 2; 1 + 3 + 5 + 7 = (1 + 7) * 4 / 2. Please summarize the general formula for calculating the above formula
17. Calculate (- 1) × (- 1) 2 × ((- 1) 3 × ×(-1)^99×(-1)^100
18. 1+2+3+4+5+6+7+8.+95+96+97+98+99+100
19. 1+2+3+4+5.+95+96+97+98+99＝?
20. This is a mark problem And 1 / 21 + 202 / 2121 + 50505 / 2121 + 13131313 / 2121 1/2+3/4+5/6+… /… +97/98+99/100