Which statement best describes the use of a catalyst in a fuel cell? It reduces waste. It lowers energy requirements. It reduces toxic exhaust. It increases reaction rates.

How can a magnetic field be used to generate an electric current? A. When a magnet moves near a wire, the domains in the magnet line up and flow through the wire as electric current. B.

Whats a earthworms genus

You need to determine the mass of an aqueous solution. You determine the mass of your 10.0 mL graduated cylinder to be 23.731 g. After adding a volume of 3.12 mL of solution to the cylinder, you reweigh it and determine the new mass to be 26.414 g.

A 4.5-liter sample of a gas has 0.80 mole of the gas. If 0.35 mole of the gas is added, what is the final volume of the gas? Temperature and pressure remain constant. 3.9 liters 5.3 liters 6.3 liters 6.5 liters

What kind of intermolecular forces act between a hydrogen chloride molecule and a hydrogen iodide molecule?

Of the following reactions, which one produces oxygen gas? Fermentation Anaerobic respiration Aerobic respiration Photosynthesis

Describe the electrodes in this iron-copper galvanic cell.

What happens to wood when it burns?

El cuerpo humano tiene unos 6 billones de células (6,0x1012) y la población de la Tierra es de unos 8 000 millones de personas. Con estos datos aproximados, calcula las moles de células humanas que hay en la Tierra.

True or false: an apple looks red because it absorbs red light?