That was extremely helpful, my Chem teacher asked us to get the % error on a density lab we will be doing, but I had never heard the term before. You saved a life.
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You’ve been very clear through your explanation especially upon providing a comparison; the comments connected to something being measured is 17 ft vs. 500 ft. Great clarity.
Hey, thanks for making this video. I was quite a bit confused of what my highschool teacher was teaching me, but now I understand a little bit more better. Thanks again!
@JesusLover077 i don't know, i guess i just wasn't in the mood. i did two out of three. so look at how i solved the first and the third errors, and you can figure out how to solve for the second one, right?
thank you for explaining what it is and why its useful rather than just going over the math. I always do better feeling like i know why im calculating something
Thank u u make chemisty easier. My teacher take 1 hour of lecture but u took only 10 time . Make more chemisty video cuz it does help us alot to understand better. Thank u .
How do you tell if a number is more accurate than two other numbers in a group based on the numbers themselves; not based on an actual value? Example: Which value is more accurate? a.) 810.13 b.) 7.132 C.) 60.1
Good presentation! But! The use of percent sign is a bit ambiguous. You multiply the error by 100 to get the percent error, not by 100 %. Because 100 % would be just 1. So 3.5/500.0 would be 0.007 and you multiply that by 100/100, which is 1, and you still get only 0.007. That's 7/1000. To write it in terms of 100 (per cent) you have to divide numerator and denominator by 10, and you get 0.7/100. It's only when you write out the percent sign that you get 0.7 %. You have to write out the % sign to keep the same value. By dimensional analysis, the feet units cancel out, and percent remains. So technically, it is correct. But to make it less ambiguous I would probably put it in parentheses and let % sign sit outside of the right parenthesis, and I would not read it out as "times 100 percent", I would rather say "times 100". Either way works, but I find it less confusing or less ambiguous this way. People are hardly taught to view % as a unit of measurement, so they may not understand what's going on.
+Samir Gunic It is correct to multiply by 100%, not 100. I believe it is important to teach that the % is just another unit of measurement and that 100% is just another conversion factor like 1000 mg/1 g, which equals 1. Why teach something that is wrong because they didn't learn it correctly the first time? The only comment I would make is that I would like to see a leading zero in 0.7%, not .7%
Excuse me but I need to know what exactly to do if I have the percent error and a question asks me to find the missing unit. For example you record a mass of 24.3g and the broken balance reads 30.0%? How do we find the missing measurement?
Oh Thought this was gonna explain standard deviation as well. I thought that for the problem to be accurate it had to be on a range of 10% of the actual value.
We got told (and i may just be wrong if i am forgeting something but i think i am not) that random uncertianty is calculated by talking the biggest recorded value and talking away the smallest value and dividing it by the number of values we recorded
How is the first answer .7%? I thought in division you have to have the fewest # of significant figures in the problem. 500.0 has 4 due to the decimal, and 3.5 has 2...100% doesnr count because it's just part of the formula..
@TiteNYC if u dont have the accepted value, then find the precision of your measurement. % uncertainty of measurement = (uncertainty of reading/reading recorded) x 100% uncertainty of reading depends on the precision of your instrument used
Okay I get percent error and we learned it in class today but can you please tell me how to find the accepted value when you’re given the percent value and our value to find the accepted value
Love u!!thank you so much I learned days I was te listening in class and thanks to my friend I’m passing chemistry and I wanna help so I’m teaching myself sun
If you're doing a lab and your values have uncertainties, do you put an uncertainty on your percentage error? It seems really strange to do so, but I'm not sure. :/
ok but how do i get it with multiple mesured into a single error calculation that is what my teacher wants is how to turn 3 triles to get a single error percentage
Dear, Can u please tell me how to calculate % error when actual value is negative lets say -100 and experimental value is positive like +50 ? please explain, do we still need ignore minus???
Yes, the formula for percent error is: (measured-accepted)/accepted value •100. This results in the number sometimes being positive and negative. Since we are considering the size of the error, you have ignore the + or - signs
