1) De los siguientes cambios indicar cuál es químico y cual es físico: •Aplastar una lata:

•Congelar agua:

•Quemar pasto:

•Hervir agua:

•Se descompone fruta:

•Se oxida hierro:

•Derretir chocolate:

•Mezclar agua y sal:

•Pulverizar un ladrillo:

•Quemar pólvora ​

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *