Which statement describes the composition of potassium chlorate, kclo3?
(1) the proportion by mass of elements combined in potassium chlorate is fixed.
(2) the proportion by mass of elements combined in potassium chlorate varies.
(3) potassium chlorate is composed of four elements.
(4) potassium chlorate is composed of five elements.

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

Describe the properties of sodium, chlorine, and sodium chloride

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus.b) the number of neutrons it contains in its nucleus.c) the number of protons it has in a cloud around the nucleus.d) the number of neutrons it has in a cloud around the nucleus.e) the number of electrons it exchanges with its neighbors.