Ch 9 Section 3 Flashcards Preview

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Flashcards in Ch 9 Section 3 Deck (15):
1

in the lab, a reaction is rarely carried out with exactly the required amount of

each o the reactants

2

in many cases, one or more reactants is present in excess, meaning there is more than

the exact amount required to react

3

once one of the reactants is used up, no more

product can be formed

4

the substance that is completely used up first in a reaction is called the

limiting reactant

5

the limiting reactant is the reactant that limits the amount of the other reactant that can

combine and the amount of product that can form in a chemical reaction

6

the substance that is not used up completely is called the

excess reactant

7

a limiting reactant may also be referred to as a

limiting reagent

8

theoretical yield is the maximum amount of product that can be produced from

a given amount of reactant.

9

in most chemical reactions, the amount of product obtained is less than the

theoretical yield

10

reactants may contain impurities or may form

byproducts in competing side reactions

11

in many reactions, all reactants are not converted to

products

12

the measured amount of a product obtained from a reaction is called the

actual yield of that product

13

chemists are usually interested in the

efficiency of a reaction

14

the efficiency is expressed by comparing the

actual and theoretical yields

15

the percentage yield is the ratio of the

actual yield to the theoretical yield, multiplied by 100