Cho 8,36 gam hỗn hợp nhôm và đồng tác dụng vừa đủ với dung dịch HCl 20%. Sau phản ứng thu được 4,4622 lít khí hydro ở đkc và m gam chất rắn. Biết ở đkc (25°C, 1 bar) thì 1 mol khí có thể tích là 24,79 lít. a) Tính khối lượng dung dịch HCl đã dùng.
b) Tìm m.
c) Xác định thành phần phần trăm theo khối lượng của mỗi kim loại trong hỗn hợp ban đầu.
d) Dung dịch sau phản ứng chứa những chất nào? Tính khối lượng các chất tan đó

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust