True or False? Atmospheric oxygen increased after the evolution of photosynthetic prokaryotes.

Aluminum reacts with oxygen to yield aluminum oxide. if 5.0 g of al reacts with 4.45 g of o2, what is the empirical formula of aluminum oxide? (type your answer using the format co2 for co2.)

Imagine a beaker divided down the center by a rigid membrane that is freely permeable to water but impermeable to glucose. side 1 contains a 10 percent glucose solution and side 2 contains the same volume of pure water.

Lewis structure for hydrogen

A drop of water placed on a smooth, dry surface will form a dome-shaped droplet instead of flowing outward in different directions. Which of these best explains this observation? A. The bonds between hydrogen and oxygen atoms are too strong. B.

What information is given by the superscripts in an electron configuration?

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?