im binge watching these videos for my chemistry final tomorrow and I really did just suddenly understand 3 different topics in 30 minutes that I never understood in the semester taught by my teacher
Melissa, you have now taken all my doubts away about passing my chemistry class. I now can see myself as the nurse I have always dreamed to be because of your tutorials. You just do not know how much of a blessing you are and how much confidence you have given me! Thanks so much!
@@happinessnyamete4242 well i dont know the exact value so i used 14 and 15 as amu for the n-14 and n-15 step1. 14.007 = (y x 14) + ((1-y) x 15) step2. 14.007 = 14y +15 - 15y step3. 14.007 - 15 = 14y - 15y step4. -0.993 = -1y step5. -0.993/-1 = y n-14= 0.993 x 100 n-15= (1- 0.993) x 100 n-14= 99.3% n-15= 0.7%
I’ve always thought I didn’t like chemistry but after seeing only two of your videos I realized that I’ve never had great teachers like you!! Thank you so much for all you do for students, this really gives us a fair chance of making through college 😊 You really are the best teacher I’ve found
Im reviewing over your "cramming for chemistry" playlist for my final tomorrow and all I can say is that you are so helpful, I am learning and understanding topics way easier than my college professor! thanks, melissa you rock
I have been teaching chem for 35 years! I love your videos and recommend them to all of my students! You are a natural teacher. BTW I am a color girl too. I love the markers and other office supplies. I need to be in therapy for my office supply addiction. Stay healthy and happy!
Melissa Maribel Hii, actually there is something - I was wondering whether you had or could make a video on Enthalpy changes and Hess’s cycles, they’re so confusing! I would really appreciate it, thank youu.
OMG I AM CRYING thankyouthankyouthankyou so much!! i really want to get into the science field in the future, even though i suck at science, and as i'm listening to the lesson today at school i really lost confidence in myself. but watching this really helped me out and i cannot thank you enough! !1!!
THANK YOU for these videos! My son is a Sophomore and your videos are helping us get through 10th grade Chemistry! He just got sent home from school because someone in one of his classes tested positive for Covid! We’re getting NO online instruction, just homework and assignments posted. Your videos are helping!!
I'm basically an old lady now trying my hand at college again. You're a life saver! I feel like the instructions in my class and in the book skip steps assuming I know what I'm doing (I don't!) and it's frustrating. This helped immensely. Also, your nails are adorable :)
I love that you understand the power of colorful visuals and clearly outlined, step-by-step instructions. Your videos and notes are going to save a lot of students' grades and sanity!
OMG I LOVE YOU SO MUCH MARIBEL, i have been stressing for my exams and ever since i started watching your videos i have been at ease you saved my life, you are a chemistry hero. Thank you so much for your help and keep up the good work.
HEY!!! It's been YEARS since you uploaded this, but I am SO SO SO grateful that it exists. I'm new to my A levels, and this helped me out ALOT in understanding questions!! THANK YOU SO MUCH!!!!!!
Never took chem in high school. Taking it now as an online class in college, 10 years after graduating high school as I pursue a degree. This video was extremely informative and helpful and easy to follow, thank you
Excellent video! It really helped that you went step by step with the math. A lot of people like myself have a hard time with chemistry because it has been a very long time since we took an algebra course so it helps to relearn the math. Many thanks!
I LOVE YOU!!! ❤️ Thank you so much! And I really needed that reminder in the beginning of the video that it’s all gonna be okay. Honestly, I need that reminder quite often 😂 thank you so much for being such a wonderful teacher and for explaining things so simple and yet so thorough, you’re helping me so much!
Thank you soo much I just watched a video and I didn’t understand but when I was watching yours it was kind of the same thing but the fact that u explained the tiniest thing that didn’t matter made me grab soooo much thank you and God bless you.u just gained a subscriber ❤🎉
I never comment on videos, because I dont think its important to. But tomorrow I have my chem20 exam and you are the only person to help me understand this! I did the two practice problems and got them right ! yes!!!
Me, and I am writing chemistry test tomorrow and I also gotta credit Melissa Maribel for the good work that she has done.She has indeed made chemistry an interesting subject to study without having any difficulties.
SHE SO FRIKIN COOL. I LOVE HER. The fact that I just couldnt get it right in class but once she explained and gave the practice questions, I got it correct in one go!
I know its a little late but most of you all are doing like high school and college chemistry I am an 8th grader doing physical science why is my school so hard :( other than that great job my teachers are talking about this for an hour I had no idea what they were talking about and within the first 20 minutes of this video I understood Thank you definitely recommend most definitely SUBSCRIBE
thank the lord for this video. I have a subscription to chegg and their description was so confusing i wanted to smash my keyboard. This makes it so simple a toddler could do it.
Thank you so much, I was so stressed cause I didn't know how to work out these problems but your video is extremely helpful, God bless you 🙏❤️ Please continue with the wonderful work 🙏❤️
This is so well explained and your way of speaking is just so sweet. You make me believe in myself in the way that I want to give my all. Thank you so much! 🙏 I love you haha
I was wondering if there was a difference on solving percentage abundance vs percentage composition, and it seems like it's the same just with different wording. The explanation and breakdown of the step by step process was great, thank you!
Percent abundance refers to the percentage of an isotope in a natural element sample, while percent composition refers to the mass percentage of each element in a compound.
THANK YOU FOR EXISTING, MY TEACHER PUT THIS ON A REVIEW WITHOUT //TEACHING// US THIS OR EVEN ///MENTIONING/// IT AND I'VE BEEN SO STRESSED THANK YOU!!!!!!
5:19 Why do you round with significant figures at the very end when you add, but you don't when you multiply the given isotopic mass with the percent abundance?
So when you are calculating to find average atomic mass, do you wait until the end to round for sig figs, or do you do that throughout the problem as you go?
Hi, Im new to ur class.. And I am actually learning Chemistry! I thank you for teaching Chemistry sooo well.. Im studying for an exam, and this is so helpful. Thank you!😇🙌👏👏👏👏👏👏👏👏👏👏👏👏👏👏
Melissa you are really the best❤ from high school you've been there for me and with your help I was able to do good in school..I don't know how to thank you but you are really the best please keep the good work up
thank you for this video! the settings where you show the exercices are pretty! question, what do we do in the x and 1-x part if there's more than two isotopes and we have to find the percent composition? or exercises usually don't so that?
Mam plz reply I understood the lecture except for X- 1 putting in the equation?? Mam what is the meaning X- 1? Why we subtract 1 from the X? Mam plz reply 🙏🙏🙏
Think about it this way: If you add up all of the copper in the world you get 100% of the copper. 100% is the same as 1 when converted to decimal form. 1-X is a way of saying "All of the copper minus the amount of Copper-63". Since there are only two isotopes of Copper, taking away all of one isotope would leave you with the amount of the second isotope. You can then assume if the % of Copper-63 is X, 1-X is the amount of Copper-65. I'm sorry I was not able to explain it better but I hope this can help.
when it comes to finding % abundance, since we don't know the %, instead of substituting % with x, can't we just take the given mass of each isotope, divide it by the average atomic mass, and multiply by 100 for the percent abundance? Thanks for the help!
I just wonder at 5.34. you said they given 4 sig figs then the answer should be 4, but they are adding not dividing or multiple, so we should choose the lowest decimal places for the answer, am I correct?
Taking Chem online during Covid is literally me teaching myself Chemistry.. your videos are SO helpful!
FELT THAT
Hahah same.
FAAACTS
Crying but true 😭
SAME
I have been teaching Chemistry for 40 years, and I must say Nice job!! Continue the good work.
Oh wow, thank you that means so much!
im binge watching these videos for my chemistry final tomorrow and I really did just suddenly understand 3 different topics in 30 minutes that I never understood in the semester taught by my teacher
nice # of likes
which year
@@cyover4401 I posted this when I was a sophomore
@@deadname2444 what are u now
This is exactly what I'm doing right now lol. I knew all the subjects when we learned the but not that the final is coming up I have to be reminded
That simply line
"It's going to be a lot easier than you think"
Is amazingly encouraging
So happy to hear 😊
Melissa, you have now taken all my doubts away about passing my chemistry class. I now can see myself as the nurse I have always dreamed to be because of your tutorials. You just do not know how much of a blessing you are and how much confidence you have given me! Thanks so much!
Man I want to become a nurse as well but chemistry in my way
She is both so beautiful & smart and she is helping me pass my high school (which is not quite easy). How can she do all that at once???
Aww thank you, happy to hear the videos are helping you pass 😊
Sorry Madame I've a question
Nitrogen is made by two isotopes N-14 and N-15 .given nitrogens atomic weigh of 14.007.what is the percent abundance of each of isotope
@@happinessnyamete4242 well i dont know the exact value so i used 14 and 15 as amu for the n-14 and n-15
step1. 14.007 = (y x 14) + ((1-y) x 15)
step2. 14.007 = 14y +15 - 15y
step3. 14.007 - 15 = 14y - 15y
step4. -0.993 = -1y
step5. -0.993/-1 = y
n-14= 0.993 x 100 n-15= (1- 0.993) x 100
n-14= 99.3% n-15= 0.7%
I’ve always thought I didn’t like chemistry but after seeing only two of your videos I realized that I’ve never had great teachers like you!! Thank you so much for all you do for students, this really gives us a fair chance of making through college 😊 You really are the best teacher I’ve found
Im reviewing over your "cramming for chemistry" playlist for my final tomorrow and all I can say is that you are so helpful, I am learning and understanding topics way easier than my college professor! thanks, melissa you rock
I have been teaching chem for 35 years! I love your videos and recommend them to all of my students! You are a natural teacher. BTW I am a color girl too. I love the markers and other office supplies. I need to be in therapy for my office supply addiction. Stay healthy and happy!
I LOVE YOU THANK YOU. I was falling behind and you have saved me
Melissa, I just found your channel and it feels like you've saved my life. 😭🙏🙏
You deserve so much more recognition, this was explained so well!!! Thank youuu for helping me understand :)
Melissa Maribel Hii, actually there is something - I was wondering whether you had or could make a video on Enthalpy changes and Hess’s cycles, they’re so confusing! I would really appreciate it, thank youu.
Greatest teacher ever😂😂😂 I spent over 3 hours trying to understand this from textbook, but got it in less than 30mins from you,
Yo the best 🤛
Homegirl just got gold bars laying around 😂🙌🏼
🤣
yooooo.. i was like holu'p'p'p'p'p'p
I know right
OMG I AM CRYING thankyouthankyouthankyou so much!! i really want to get into the science field in the future, even though i suck at science, and as i'm listening to the lesson today at school i really lost confidence in myself. but watching this really helped me out and i cannot thank you enough! !1!!
THANK YOU for these videos! My son is a Sophomore and your videos are helping us get through 10th grade Chemistry! He just got sent home from school because someone in one of his classes tested positive for Covid! We’re getting NO online instruction, just homework and assignments posted. Your videos are helping!!
I have a chem test today and this video just saved my grade. Thank you so much for making it so easy to understand!
I'm basically an old lady now trying my hand at college again. You're a life saver! I feel like the instructions in my class and in the book skip steps assuming I know what I'm doing (I don't!) and it's frustrating. This helped immensely. Also, your nails are adorable :)
I love that you understand the power of colorful visuals and clearly outlined, step-by-step instructions. Your videos and notes are going to save a lot of students' grades and sanity!
This video was probably the best way anybody could explain how to do this. You are awesome
OMG I LOVE YOU SO MUCH MARIBEL, i have been stressing for my exams and ever since i started watching your videos i have been at ease you saved my life, you are a chemistry hero. Thank you so much for your help and keep up the good work.
Your videos are amazing! You explained a concept in under 15 minutes that my professor couldn't in 50 minutes! Thank you!
i really appreciate these videos. You explain everything in detail step by step so people don't get lost. Thank you!
omgggggggggggg this was soooooooooooooo helpful i wish i could have u as a teacher for ever!!!!!! ur the best!!!
HEY!!! It's been YEARS since you uploaded this, but I am SO SO SO grateful that it exists. I'm new to my A levels, and this helped me out ALOT in understanding questions!! THANK YOU SO MUCH!!!!!!
Never took chem in high school. Taking it now as an online class in college, 10 years after graduating high school as I pursue a degree. This video was extremely informative and helpful and easy to follow, thank you
Excellent video! It really helped that you went step by step with the math. A lot of people like myself have a hard time with chemistry because it has been a very long time since we took an algebra course so it helps to relearn the math. Many thanks!
You deserve to have so much recognition. Thank you, this video was so helpful!
Omg. I just fell in love with you. I am less than a minute into the video and you have already taught me more than my chemsistry book did.
we just learned about isotopes...this video couldn't have been posted at a better time! thank you so much!
Really well done! Glad you put a lot of effort to make this video understandable and fun.
I LOVE YOU!!! ❤️ Thank you so much! And I really needed that reminder in the beginning of the video that it’s all gonna be okay. Honestly, I need that reminder quite often 😂 thank you so much for being such a wonderful teacher and for explaining things so simple and yet so thorough, you’re helping me so much!
You're very welcome! You got this!
These videos are SO FLIPPING GOOD its crazy. This is how I will be passing my chemistry exam.
i have an exam in 45 mins and i finally understand this thank you soooooo muchhhh
subscribed, liked and notifications on!
Thank you soo much I just watched a video and I didn’t understand but when I was watching yours it was kind of the same thing but the fact that u explained the tiniest thing that didn’t matter made me grab soooo much thank you and God bless you.u just gained a subscriber ❤🎉
I loved how you list all the step by step and list your inventory!
Hey Melissa! I was just wondering why for the isotope abundance the first x was 63cu and not 65cu? Thank you!
you make everything look so easy and i love the way you explain, i wish i had you as my professor
thank you so much for these videos! you’re basically the only reason i’m passing chem right now 😭
tytysm i have a test tomorrow and your videos have been more helpful than my teacher
Taking a deep breath then its a lot easier than you think .woah yeah what a relief . Been watching your videos thank u
I never comment on videos, because I dont think its important to. But tomorrow I have my chem20 exam and you are the only person to help me understand this! I did the two practice problems and got them right ! yes!!!
You just saved me the most giant headache of my life. thank you so much! the editing in this video is great too :)
who is watching 2019
Me, and I am writing chemistry test tomorrow and I also gotta credit Melissa Maribel for the good work that she has done.She has indeed made chemistry an interesting subject to study without having any difficulties.
@@karabokgosietsile1949 how much did you get?
@@ilyasjamei1413 At 8:10, why should we give 'x' to 1st isotope why not to another one?
if we do so then it would certainly effects our results?!
2020
2021! Gotta pass that final
Here, I think you dropped this 👑
Haha why thank you 👸🏻
SHE SO FRIKIN COOL. I LOVE HER. The fact that I just couldnt get it right in class but once she explained and gave the practice questions, I got it correct in one go!
this is honestly so helpful! keep posting please!
you literally just taught me more than my chemistry teacher who's been teaching grade 11 chem for years in 11:25.
Thank you a ton! I actually found you on a yt comment section and pressed your channel. You channel is so entertaining x x
thank you so much for all your help! I have my first college chem exam tomorrow & I feel so much more prepared!! xox
I have an exam on Monday and this video totally saved me!!!!!! thank youuu
one of the best online teachers out there!!
I know its a little late but most of you all are doing like high school and college chemistry I am an 8th grader doing physical science why is my school so hard :( other than that great job my teachers are talking about this for an hour I had no idea what they were talking about and within the first 20 minutes of this video I understood Thank you definitely recommend most definitely SUBSCRIBE
Your way of teaching was amazing...I don't understand why some people dislike this video..
Thank you so much Jasimen! 💕
Im pretty sure you just saved my life right now. Thank you!
thank the lord for this video. I have a subscription to chegg and their description was so confusing i wanted to smash my keyboard. This makes it so simple a toddler could do it.
Thank you so much, I was so stressed cause I didn't know how to work out these problems but your video is extremely helpful, God bless you 🙏❤️
Please continue with the wonderful work 🙏❤️
Thankkk u sm i wanted to die before lol
Lol I'm so glad you're alive 😂
Chemistry with Melissa Maribel IM GLAD UR ALIVE TOO!!! ❤️LMAO
Thank you soo much. Your teaching style is really understandable for me.
This is so well explained and your way of speaking is just so sweet. You make me believe in myself in the way that I want to give my all. Thank you so much! 🙏 I love you haha
I was wondering if there was a difference on solving percentage abundance vs percentage composition, and it seems like it's the same just with different wording. The explanation and breakdown of the step by step process was great, thank you!
Percent abundance refers to the percentage of an isotope in a natural element sample, while percent composition refers to the mass percentage of each element in a compound.
Girllll you are like a life saver!!!
THANK YOU FOR EXISTING, MY TEACHER PUT THIS ON A REVIEW WITHOUT //TEACHING// US THIS OR EVEN ///MENTIONING/// IT AND I'VE BEEN SO STRESSED THANK YOU!!!!!!
You can thank my momma for that 😂Haha but seriously you are so welcome, I'm so happy I can relieve some of that stress for you 😊
@@melissamaribel
You're a godsend, oml. Keep doing what you do, bro! You're fantastic at it!
5:19 Why do you round with significant figures at the very end when you add, but you don't when you multiply the given isotopic mass with the percent abundance?
THIS CHANNEL IS GETTING ME THROUGH CHEM THANK YOU!
Pls how do we identify or detect isotopes ie methods of identifying isotopes.
I dont think i need to go to my chemistry lessons, your videos are WAAYYYY Better omg
Haha why thank you
Very easy to follow. Love your notes
So when you are calculating to find average atomic mass, do you wait until the end to round for sig figs, or do you do that throughout the problem as you go?
Online learning Fall 2020. Thank you!!!!
Hi, Im new to ur class.. And I am actually learning Chemistry! I thank you for teaching Chemistry sooo well.. Im studying for an exam, and this is so helpful. Thank you!😇🙌👏👏👏👏👏👏👏👏👏👏👏👏👏👏
Melissa you are really the best❤ from high school you've been there for me and with your help I was able to do good in school..I don't know how to thank you but you are really the best please keep the good work up
Ma'am my chemistry is so weak but when I got your video then my chemistry is become strong and I got 100 marks in examination
Thank you so much I really understood these topics so well....better than my chemistry teacher
This video is about to help me get into 2nd year of uni lmao, I appreciate it a lot
My final is tomorrow so i wish i would have g]found your channel earlier
You are amazing! I am so grateful for your channel! You just pulled me out of a funk of feeling like I was too stupid for chemistry
i wish my professor was this clear!! thank you
Your vids are amazing, thank you so much. Everything was clear and understood...way better than my chem professor by 100000%
Would you be able to explain more about the (1-x) with the 1 representing one hundred?
Thank you sooo much..helps alot
Lots of love from Malaysia
We need more people like you in everyone's lives
O my god ur the best concept explainer ever.....it helped me in my online test
thankyou so much for this! it really helps me a lot for my exam🤍
I wish you were my chemistry tution teacher to help me through my Exams
Saved me on a quiz today thank you so much
thank you for this video! the settings where you show the exercices are pretty!
question, what do we do in the x and 1-x part if there's more than two isotopes and we have to find the percent composition? or exercises usually don't so that?
Thank you so much! This makes so much more since after you walked me through it!
You're so welcome! Happy to hear it makes sense now 😊
Omg I am literally doing chemistry hw while I watch your explanation and I got it right!
Mam plz reply I understood the lecture except for X- 1 putting in the equation?? Mam what is the meaning X- 1? Why we subtract 1 from the X? Mam plz reply 🙏🙏🙏
Think about it this way: If you add up all of the copper in the world you get 100% of the copper. 100% is the same as 1 when converted to decimal form. 1-X is a way of saying "All of the copper minus the amount of Copper-63". Since there are only two isotopes of Copper, taking away all of one isotope would leave you with the amount of the second isotope. You can then assume if the % of Copper-63 is X, 1-X is the amount of Copper-65. I'm sorry I was not able to explain it better but I hope this can help.
@@johndebate3858 Thank you so much Bro🤗🤗🤗👍👍👍
@@johndebate3858 you are a real one my guy!
when it comes to finding % abundance, since we don't know the %, instead of substituting % with x, can't we just take the given mass of each isotope, divide it by the average atomic mass, and multiply by 100 for the percent abundance? Thanks for the help!
thank you so much! i wouldn’t have passed my chemistry quiz without your help!
Thank you mam. This help me alot to understand and solve problems.
😊😊
Thank you soo much Melissa❤️❤️💓💓I love your explanation.. It's very clear and simple to understand
With the first problem, how do you know which number to stop at after the decimal?
I am not skipping the ads to thank youuu!
GIRL IM IN LOVE WITH UR VIDEOS
U went out the way to do prove a point. But I'm glad about the tutorial. Thanks.
thankyou, this was very helpful to me!
Thank you! What if it only gives you one percentage to use for 2 isotopes?
If it only gave you 1 percent then you would subtract that percentage from 100 to find the second percent.
I just wonder at 5.34. you said they given 4 sig figs then the answer should be 4, but they are adding not dividing or multiple, so we should choose the lowest decimal places for the answer, am I correct?