The pass change in which a substance change from solid to a liquid is

A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it? The half-life of U-238 is 4.5 * 109 years. 1.4 * 1010 years2.1 * 109 years7.3 * 1011 years7.

Predict at least two circumstances (outside influences) that would cause a system in equilibrium to change the concentrations of its reactants or products.,

How would adding the catalyst nitrogen monoxide (NO) affect this reaction? 2SO2 (g) + O2 (g) → 2SO3 (g)

How does chemical weathering keep the Earth from getting too hot to support life?

If 3 g of sodium reacts with chlorine, how many grams of sodium chloride will be produced?

What is the mass of 1 mole of carbon dioxide CO2?

An experiment is performed using 7 liquids; Methanol, Ethanol, Propanol, Butanol, Water, Pentane and Acetone. a.) The order of rates of evaporation from fastest to slowest are shown: Pentane, Ethanol, Methanol, Acetone, Water, Propanol and Butanol.

What does a molecule look like

If a student calculated 0.02789 moles of copper (II) cations (Cu2 + ions) in the sample, how many moles of copper metal (Cu0) could be obtain from the sample at the end of the experiment?

99pts! Which of the following best explains what happens when the kinetic energy of particles in a gas state decreases? They vibrate so quickly that the particles ionize and become plasma.