A star is estimated to have a mass of of 2 X 10^36 kg. Assuming it to be a sphere with an average radius of 7.5 X 10^5 km, calculate the average density of the star in units of grams per cubic centimeter.

Density = g/cm^3

What is a physical change that might occur when preparing a meal?

Where in the world was aluminum found

Write a generic Lewis structure for the halogens. Draw the Lewis dot structure for X

The enthalpy of combustion for octane (C8H18 (l)), a key component of gasoline, is - 5,074 kJ/mol. This value is the Hrxn for which of the following reactions? A - 2C8H18 (l) + 25O2 (g) 16CO2 (g) + 18H2O (g) B - C8H18 (l) + 12.

A sample of gas has a volume of 1.20 L at standard conditions. Find its volume at 35.0 oC and 900 torr. (R = 62.4 L torr/K * mol) Group of answer choices A. 1.14 L B. 2.52 L C. 0.980 mL D. 3.92 mL

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?