According to a new report by the Wall Street Journal, the US Securities and Exchange Commission (SEC) is investigating whether Tesla CEO Elon Musk and his brother Kimbal Musk violated regulations banning insider trading. The investigation began late last year after Musk and his brother sold $108 million worth of Tesla stock. The transaction was […]
Câu hỏi: Cho 35 ml hỗn hợp gồm H2 và amin đơn chức nào dưới đây vào 40 ml O2 thu được 20 ml gồm 50% là CO2, 25% là N2, 25% là O2? Lời giải tham khảo: Đáp án đúng: A Do điều kiện như nhau nên ta sử dụng thể tích như số mol (để […]
Spen with low latency, close to the lifelike writing experience With a large screen device, Samsung tablet is not only used for simple web surfing, watching movies, but also a work support device. Since its launch, the Spen has been one of our favorite technology devices for its usefulness, gradually upgrading to the lowest latency […]
OnePlus just launched the OnePlus 10 Pro in White Extreme in China, marking the first time the brand has offered a white version since the OnePlus 6. A company executive has explained why we I don’t often see white smartphones. OnePlus production manager Liu Fengshuo said on Weibo that there are three reasons why white […]
Câu hỏi: Điều chế 1 lít ancol etylic 40o (d = 0,8 g/ml) với H = 80% thì khối lượng glucozơ cần là mấy? Lời giải tham khảo: Đáp án đúng: C Glucozơ (C6H12O6) → 2C2H5OH + 2CO2 → CaCO3 → nC2H5OH = nCO2 = x Ta có: mdung dịch tăng = mC2H5OH + mCO2 – mCaCO3 = 3,5 → 46x + 44x […]
Đáp án C Quy đổi hỗn hợp (H) thành Mg, Fe, CO3 và NO3 + Natri cuối cùng đi về NaCl (Rightarrow ) nHCl pứ = nNaOH = 1,02 (mol) (Rightarrow )mHCl pứ = 37,23gam (Rightarrow )BTKL ta có ({{n}_{{{H}_{2}}O}}=0,34(mol)) + PT theo mX – mH là: 44a + 62b = 7,08 (1) + PT […]
Besides the standard version Redmi Buds 3 that we have on hand in the previous article, Xiaomi also introduces another “cheap” wireless headset model in the Vietnamese market called Redmi Buds 3 Lite. In the Chinese market, this headset is also known as Youth Edition, and has an even cheaper price, only 350,000 VND. With […]
Đáp án D ({{n}_{este}}:{{n}_{NaOH}}=1:2Rightarrow {{n}_{este}}=0,15,molRightarrow {{M}_{este}}=146) (R+2=58({{C}_{4}}{{H}_{10}}).) Vì tạo 2 ancol nên phải có tối thiểu 1 gốc CH3, 1 gốc C2H5 A là: C2H5OOC-CH2-COOCH3: a (mol) Este B: Vì nNaOH = 0,3 mol; Este đơn chức, nên tỷ lệ phản ứng hoặc 1 : 1 hoặc 1 : 2 TH1: este dạng RCOOR’ (Rightarrow […]
On March 4, blockbuster The Batman of DC Films and Warner Bros. will officially premiere, opening a new superhero universe revolving around the Dark Knight. This will also be the opening work for an extremely busy year for DC, with many notable names “lined up” behind such as Black Adam, The Flash or Aquaman and […]
Groomatic automatic cat grooming machine Grooming and petting animals has been scientifically proven to bring a lot of benefits. On high-end farms, farmers even put automatic grooming machines for cows to help them relax, producing more milk. On Kickstarter appeared a similar machine but with a “mini” size for cats named Gromatic. With cats, in […]