7. The model of the universe that suggests that the sun is the center of the universe was first brought by

A. Brahe.

B. Ptolemy.

C. Copernicus.

D. Kepler.

If 5.0 L of carbon dioxide gas are produced by the reaction below at STP, how many liters of oxygen gas were used in the reaction?

In the reaction H2 + N2 2 NH3, what coefficient should be placed in front of H2 to balance the reaction

Magma that fuels this type of volcano contains large volumes of gases but not silica and water.

9.65 lb / ft^3 to g/mL

An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly small pieces of wax melted during the experiment.

Which of the following is true according to the kinetic theory of gases? A) Molecules move randomly. B) Molecules have elastic collisions. C) Molecules occupy negligible volume. D) all of the above E) none of the above

In which time period did Ancient Greek philosophers propose that all matter was composed of four fundamental substances: earth, air, water, and wind? 8000 B. C. - 1000 B. C. 1000 B. C. - 450 B. C. 300 B. C. - 1400 A. D. 1774 - 1794 A. D.

You are assembling cars, and your job is to put the wheels on the vehicles. You have 3520 wheels, 14040 nuts (4 nuts per wheel) and 1000 car bodies at the start of the day.

Predict what would happen to life on earth if the Earth suddenly stopped rotating on its tilted axis?

The most common isotope of chromium has a mass number of 52. which notation represent a different isotope of chromium?