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hoangthanhluan23102005
2 năm trước
cân bằng các phương trình sau mik cần gấp 21) C2H2 + O2 → CO2 + H2O 22) C4H10 + O2 → CO2 + H2O 23) C2H2 + Br2 → C2H2Br4 24) C6H5OH + Na → C6H5ONa + H2 25) CH3COOH+ Na2CO3 → CH3COONa + H2O + CO2 26) CH3COOH + NaOH → CH3COONa + H2O 27) Ca(OH)2 + HBr → CaBr2 + H2O 28) Ca(OH)2 + HCl → CaCl2 + H2O 29) Ca(OH)2 + H2SO4 → CaSO4 + H2O 30) Ca(OH)2 + Na2CO3 → CaCO3 + NaOH 31) Na2S + H2SO4 → Na2SO4 + H2S 32) Na2S + HCl → NaCl + H2S 33) K3PO4 + Mg(OH)2 → KOH + Mg3 (PO4)2 34) Mg + HCl → MgCl2 + H2 35) Fe + H2SO4 → FeSO4 + H2
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Paragraph 1 Chinese New Year is timed according to the lunar calendar, not the solar calendar. Chinese New Year is a very important holiday for Chinese people. Everyone will take a break during the Chinese New Year. It is a time for rest and refreshment. Most of the businesses, stores and even schools close at this time. On New Year’s Eve, we have a reunion dinner with our family members. After the dinner, elders will give the red envelopes to the kids. There is lucky money in the red envelopes. Chinese people set off fireworks and firecrackers at midnight. Some of the people are performing dragon dance or lion dance to celebrate the Chinese New Year. Chinese New Year is the most important festival. 1. Chinese New Year follows calendar. 2. Chinese people will have a during the Chinese New Year for rest and refreshment. 3. Families will have a with their family members on the New Year’s Eve. 4. Elders will give the red to the kids. 5. There are and firecrackers during the New Year’s Eve.

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