In an experiment, potassium chlorate decomposed according to the following chemical equation.
KCIO3 → KCI + O2
(Molar mass of KCIO3 = 122.5 g/mol; KCI = 74.55 g/mol; O2 = 31.998 g/mol)
If the mass of potassium chlorate was 240 grams, which of the following calculations can
be used to determine the mass of oxygen gas formed? (4 points)

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the correct answer is:

a. formation of precipitation

c. electrical charges of ionic bonds.