Term
What is a ratio
what are like numbers 

Definition
the relative magnitudes of two like numbers
In story problems, like numbers are numbers with the same units 


Term
Define the relationship between two amounts
when can it be used 

Definition
simple related terms have numerical values units
can be used to construct conversion factors and proportions 


Term
What are direct proportions
what can be directly proportional 

Definition
as one value doubles, an associated value double
ratios or related terms 


Term
what are inverse proportions? 2
what is one example of this? explain 

Definition
less common than direct proportions
as one value goes up, the related value goes down

Dilutions: when we dilute something, the volume goes up but the concentration goes down 


Term
what is important to know when using inverse proportions
2 

Definition
always use ratios
put the related terms in opposite positions 


Term
what is important to know when using proportions to solve complex calculations
2 

Definition
requires multiple steps
allows us to see our intermediate answers and more easily identify our mistakes 


Term
What is dimensional analysis
2 

Definition
solution can be deduced by the units that the answer should have
use a string of related terms that are placed such that their units cancel to those that you have determined for the answer 


Term

Definition


Term
benefits of dimensional analysis
3 

Definition
efficient
hard to identify your mistakes
if you have a substance that doesn't look right, make sure you label you rnumbers with both units and substance 

