Use the drop-down menus to indicate the stage of technological design in which each action would occur. Establish criteria and prepare the initial design.

Redesign and retest as necessary.

Define a need and research related information.

Build and test a prototype.

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.