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La materia se compone de pequeñas
partículas llamadas átomos. ¿Cuál de los
siguientes científicos estableció que los
electrones giran alrededor de un núcleo en
varios niveles de energía?

A Joseph John Thomson
B Ernest Rutherford
C John Dalton
D Niels Bohr

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

What is happening when the water inside a kettle heats up and begins to boil