Fossil fuels are considered useful to humans because they are

A flask with a volume of 12.0 l contains 4.25 mol of oxygen gas at 15ºc. how many moles of nitrogen gas must be added to give a total pressure of 10.0

What is a limiting reagent?

The atomic mass of iodine (i) is less than the atomic mass of tellurium (te). but an iodine atom has one more proton than a tellurium atom. explain how this situation is possible.

If an ice cube melts at 0ºC but water also freezes at 0ºC, what is the difference between melting and freezing in terms of ... 8. The energy involved in the phase changes and 9. The motion of the particles of the substances during the phase changes?

What does a strong nuclear force do in an atom? a. It repels electrons from other electrons. b. It repels protons from other protons. c. It attracts protons and neutrons. d. It attracts protons and electrons.

3. A good way to show the relationship between variables is to make a

How much energy is needed to heat 1 kg of sand, which has a specific heat of 664 J / (kg K), from 30°C to 50°C?

How much energy is needed to change 44 grams of ice at - 8° to steam at 107°?

One benefit of nuclear fission reactions is

How does the structure of the stigma aid in pollination?