4. A sealed glass tube contains 2.25 g of copper and 3.32 g of sul- fur. The mass of the tube and its contents is 18.48 g. Upon heating, a reaction forms copper(II) sulfide (Cus). All of the copper reacts, but only 1.14 g of sulfur reacts, Predict what the mass of the tube and its contents will be after the reaction is completed. Explain your reasoning.​

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

The table lists the lattice energies of some compounds.compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf.the lattice energy increases as the cations get larger, as shown by lif and licl.the lattice energy decreases as cations get smaller, as shown by nacl and naf.the lattice energy decreases as the cations get smaller, as shown by naf and kf.