Stoichiometry, continued

Question 1

Define Experimental error.

Answer 1

The difference between a quantity’s measured (theoretical) value and it’s true value.

Question 2

Define Repeatability

Answer 2

The ability of an experiment to produce the same or very, very similar results for multiple runs/experimentors. This determines the reliability of the experiment and the data gained from it.

Question 3

Equation for percent yield.

Answer 3

Percent yield = (actual yield/theoretical yield) x 100

Question 4

Empirical Formula?

Answer 4

A formula that shows the simplest ratio of elements present in a compound

(in other words, the model used by many compounds of that type. Carbohydrates are an example of this.)

Question 5

Molecular Formula?

Answer 5

Formula that shows the actual number of each element in a compound

Ex: Glucose, a type of carbohydrate, has an empirical formula of CH2O and a molecular formula of C6H12O6.

Question 6

Define Polyatomic Ion.

Answer 6

An ion composed of two or more atoms that are covalently bonded to one another.