Que cambios son fisicos y cuales son quimicos?

a) quemar papel

b) limpiar objetos de plata

c) hacer hielo en el congelador

d) fundir hierro

Easy way chlorine exists mainly as two isotopes 37cl and 35cl which is more abundant

If the formation of NaCl proceeds according to the following equation and change in enthalpy, what is the reaction and change in enthalpy for the decomposition of 2 moles of NaCl? Na + ½Cl2→NaCl, ΔH = - 411 kJ

The nuclear product of radioactive decay is called the_ o parent nuclide o mass defect o half life daughter

The diagram shows light striking a pane of glass. some of the light is reflected, and some of the light is transmitted. the letters represents six different angles. describe two places where refraction takes place.

If you wanted to detect x-rays coming from the sun, where would you place the detector? And why?

Which of the following has the greatest first ionization engergy li, be, b or c

If we know that 10.0 cm3 of ice has a mass of 9.19 g what is the density of ice

1. The is the particle in the nucleus of the atom that carries a positive charge and is counted to identify the atomic number. What's the answer

How many grams are there in 5.00 moles of lead Pb?

A large body in space that orbits a star and does not produce light of its own