CHEM 1070 Lecture Notes - Lecture 5: Polyatomic Ion

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14 Jun 2021

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Document Summary

Compound material formed of two or more elements in definite proportions. Can be decomposed to elements and simpler compounds. The elements combine in definite proportions to form a given compound. All samples of a given compound have the same proportions of their constituent elements. Ratio of elements in a compound does not change. Ratio of masses of elements in a compound is constant. Atoms combine in whole-number ratios but mass ratios are not always whole numbers. Represents the relative number of atoms for each element with the subscripts. Polyatomic ion group of atoms in a molecule that act as a unit. Charge is associated with the group as a whole (+ or -)

Related Questions

In a series of experiments, a chemist prepared three different compounds that contain only iodine and fluorine and determined the mass of each element in each compound:

(a) Calculate the mass of fluorine per gram of iodine in each compound. (b) How do the numbers in part (a) support the atomic theory?

b) When all three numbers are divided with 0.15, it gives: 5, 3, and 7. So, F and I form compounds in constant, whole number ratios. This is a law of multiple proportions and goes along with Dalton’s atomic theory since the F and I atoms combine in known ratios, and the masses of atoms are constant.