A furnace that provides heat by burning methane gas (CH4) must have the correct mixture of air and fuel to operate efficiently. What is the mole ratio of air to methane gas in the combustion of methane? Air is 20% oxygen.

Evaluate each scenario described to determine the direction of heat flow. ice cube to tap water tap water to ice cube

Mei wants to study whether heart rate increases more during certain exercises than during others. She designs an experiment to test the heart rates of classmates in the morning and in the evening for three days, immediately after doing jumping

What happens to the energy of a system when a proton moves away from another proton?

Describe the real world examples of newtons third law

a 0.316 mol sample of nitrogen gas N2 (g) is placed in a 4.00 L container at 315 k. what is the pressure in torr of the nitrogen gas

Explain how a nuclear power plant uses the process of nuclear fission to produce electricity.

Compare and contrast chemical potential energy and elastic potential energy

Which of the answer choices best describes how electrons move, according to modern atomic theory? They vibrate in place. They move like planets. They move in orbitals. They slide past each other.

The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma membrane, but water and urea can. Which of the following solutions will cause a red blood cell to shrink? a.

A geologist discovered fossils of marine animals in a layer of sedimentary rock in the desert. Based on this discovery, what conclusion can the geologist draw?