Which of the following cannot be separated by physical means?

A. mixtures

B. solutions

C. elements

D. none of the above

How would the composition of an atom change both the atomic number and mass number each increase by one

The island of spitzbergen is in the arctic ocean, near the north pole. fossils of tropical fruits have been found in coal deposits in spitzbergen. what does this indicate?

If the Moon rises at 7 P. M. on a particular day, then approximately what time will it rise six days later?

2C3H7OH (l) + 9O2 (g) → 8H2O (g) + 6CO2 (g) ΔHreaction = 1,830 kJ/mol Calculate the enthalpy of combustion for 55.9g isopropanol given the molecular weight of isopropanol is 60.096 g/mol.

Write the half-reaction that occurs at a hydrogen electrode in acidic aqueous solution when it serves as the anode of a voltaic cell. express your answer as an ionic half-reaction. identify all of the phases in your answer.

Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+? (1) The Cd atom gains two electrons and its radius decreases. (2) The Cd atom gains two electrons and its radius increases.

Explain Charles law

2 H2 + O2 → 2 H2O What is the product of this chemical reaction

Which of the following is a chemical property? A.) Ability to burn B.) Mass C.) Density D.) All of the above

What is the density of rock if it has a mass of 25 g?