The half-life of radium-226 is 1600 years. How many grams of a 0.25 g sample will remain after 4800 years?

Is the measure of a quantity of energy. Temperature Mole Heat Kinetic motion

What mass of water is required to react completely with 157.35 g CO2?

The pressure of a mixture of nitrogen, carbon dioxide, and oxygen is 300 kPa. What is the partial pressure of oxygen if the partial pressures of the nitrogen and carbon dioxide are 200 kPa and 48 kPa, respectively

What is an igneous rock

What is the importance of water on earth? A) it keeps the top layer of the geospere cool B) it allows life to exist C) it provides ice at the poles D) it creates earths blue color from space

Which of the following statements best describes the basic structure of an atom? Electrons and protons are in motion around a nucleus that contains neutrons Neutrons are in motion around a nucleus that contains protons and electrons Protons are in

Which of the following elements is released into the atmosphere by all of these processes: volcanic outgassing, animal respiration and flatulence, burning of fossil fuels, and metamorphism of limestone? a. Carbon. b. Nitrogen. c. Oxygen. d. Sulfur

A phase change from a solid to a gas is called what

What is the meaning of semipermeability?

What type of reaction does Fe+Ag2SO4-FeSO4+Ag