What coefficients would balance the following equation?

__Al + __O2 → __Al2O3

A. 2Al + 3O2 → 1Al2O3

B. 2Al + 3O2 → 2Al2O3

C. 3Al + 3O2 → 2Al2O3

D. 4Al + 3O2 → 2Al2O3

Which of the following is a benefit of urbanization A.) Paying over land changes the environment B.) living in cities is more expensive than living in rural areas C.) Cities are hubs for the arts, entertainment, and education D.

A person pushes horizontally with a force of 220. N on a 61.0 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.270.

Which of the following is not a step in the inquiry process? a. Summary b. Observation c. Execution d. Question

Which scientist was the first to use the telescope in astronomy

List some ways that the sun's energy affects our atmosphere

An example of an unbalanced force is

When the atom's electrons step down to lower energy levels in a thin cloud of hot gas, what is produced?

Which is the relationship between algae and fungus? Options: Parasitism. Commensalism. Mutualism.

Photosynthesis is an endothermic chemical reaction that forms sugars from carbon dioxide, water, and the sun's energy. Which of the following must be true of photosynthesis?

What is a calorimeter used to measure?