Unit 2 Quiz study guide
---TERMINOLOGY
Learn these basic pharmacology terms: tolerance synergism antagonism therapeutic prophylactic ---METRIC CONVERSIONS
Here are some important tips to remember when converting from one metric unit to another … [mg]-to-[grams], [liters]-to-[ml], [cm]-to-[mm], etc …
1) First thing to ask yourself is … “what is the relationship between the two different units?”
Here is an example of what I mean. If you are asked to convert 300mg into its equivalent value expressed in grams (g), you first need to determine how many of the smaller units are contained in one of the larger units … in this case we would use the fact that [1g] is equal to [1000mg], or stated another way, each 1-gram contains 1000mg.
2) Knowing the relationship between units in a conversion gives you a critical piece of info that you will need to solve the problem. This piece of info is called a RATIO. IMPORTANT NOTE: a RATIO can be inverted depending on what unit you are solving for. This is explained further in step-3 below.
3) The fact that one-gram equals 1000-mg can be expressed as a RATIO in either of the following two ways: [1g/1000mg] or [1000mg/1g]. You’ll see how valuable this ‘RATIO’ is in step-5 below where I will show you how to set-up this problem.
4) Using the numbers from above, here is what we know so far. We have our original value of 300mg, and we know that there are 1000mg in each 1-gram (again, this is most useful if written as a ‘RATIO’ in either of the following two ways … [1000mg/g] or [1g/1000mg]).
5) Here’s the set-up – 300mg x 1g/1000mg = (300)(1)/1000 = 300/1000 = 0.3g . Look closely at what just occurred … we multiplied 300mg x 1g, then divided this number by 1000mg. DON’T MISS THIS PART!!! …the [mg]units cancel each other out, leaving our final answer in grams (g), which is precisely what the question asked of us (see the color illustration of this problem below).
300mg x 1 g = (300mg)(1g) = 300 = 0.3g
Learn these basic pharmacology terms: tolerance synergism antagonism therapeutic prophylactic ---METRIC CONVERSIONS
Here are some important tips to remember when converting from one metric unit to another … [mg]-to-[grams], [liters]-to-[ml], [cm]-to-[mm], etc …
1) First thing to ask yourself is … “what is the relationship between the two different units?”
Here is an example of what I mean. If you are asked to convert 300mg into its equivalent value expressed in grams (g), you first need to determine how many of the smaller units are contained in one of the larger units … in this case we would use the fact that [1g] is equal to [1000mg], or stated another way, each 1-gram contains 1000mg.
2) Knowing the relationship between units in a conversion gives you a critical piece of info that you will need to solve the problem. This piece of info is called a RATIO. IMPORTANT NOTE: a RATIO can be inverted depending on what unit you are solving for. This is explained further in step-3 below.
3) The fact that one-gram equals 1000-mg can be expressed as a RATIO in either of the following two ways: [1g/1000mg] or [1000mg/1g]. You’ll see how valuable this ‘RATIO’ is in step-5 below where I will show you how to set-up this problem.
4) Using the numbers from above, here is what we know so far. We have our original value of 300mg, and we know that there are 1000mg in each 1-gram (again, this is most useful if written as a ‘RATIO’ in either of the following two ways … [1000mg/g] or [1g/1000mg]).
5) Here’s the set-up – 300mg x 1g/1000mg = (300)(1)/1000 = 300/1000 = 0.3g . Look closely at what just occurred … we multiplied 300mg x 1g, then divided this number by 1000mg. DON’T MISS THIS PART!!! …the [mg]units cancel each other out, leaving our final answer in grams (g), which is precisely what the question asked of us (see the color illustration of this problem below).
300mg x 1 g = (300mg)(1g) = 300 = 0.3g