A sample of a hydrocarbon contains 20.75 g C and 4.25 g H. Its molar mass is 58.04 g/mol. What is its empirical formula C2H5 CH2 CH C5H

The softest and hardest minerals are:

Which of these is a chemical property? A. Mercury is a dense liquid. B. Iodine vapor has a purple color. C. Aluminum is a very conductive metal. D. Ice melts at 0°C. E. Iron rusts in wet weather.

How are physical and chemical changes similar? Neither can change the number of atoms of each element that are present. Neither can cause chemical bonds to break. Neither can result in a phase change.

How does the energy released in a nuclear reaction get created? A. By an endothermic reaction occurring B. By the mass of the nucleus getting smaller C. By bonds being created between two atoms D. By water turning into hydrogen and oxygen

A flask holds 3.01 x 10^23 molecules of carbon dioxide. The container is holding A) 0.25 moles of carbon dioxide B) 0.50 moles of carbon dioxide C) 0.75 moles of carbon dioxide D) 1.0 moles of carbon dioxide

Which laws can be combined to form the ideal gas law? Boyle's law and Charles's law Gay-Lussac's law and Avogadro's law Charles's law, Avogadro's law, and Boyle's law Dalton's law, Gay-Lussac's law, and Avogadro's law

What determines the horizontal arrangement of the periodic table?

A 55.3 g sample of lead heated and then quenched in a 175g sample of water. During the quenching reaction the temperature of the water increases from room temperature, 25.0 °C, to 42.6 °C.

What conclusion can you draw from this experiment about the components of the black ink

How does the size of ions affect the conductivity of a solution?