Mét nåi h¬i b»ng thÐp cã khèi l-îng lµ 900 kg. Nåi h¬i chøa 400 kg n-íc. Gi¶ sö hiÖu suÊt sö dông nhiÖt cña nåi h¬i lµ 70%. CÇn bao nhiªu calo nhiÖt ®Ó n©ng nhiÖt ®é cña
nåi h¬i tõ 100C lªn 1000C, biÕt nhiÖt dung cña thÐp lµ 0,11 kcal/kg vµ cña n-íc lµ 1 kcal/kg

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent