On example 1 at 1:40, I meant to state molecules instead of atoms! If it were atoms since CO2 has 3 individual atoms ( 1 C and 2 O ) it would be 3 times our final answer so for atoms it would be 9.0 x 10^23 times 3 so the answer would be 2.7 x 10^24 atoms CO2 And for the practice problem 4:05 instead of molecules it should be formula units but the answer is still correct. Sorry guys I tend to take these questions from previous exams and I didn't catch the question was worded incorrectly. Note: We use the following units for different types of elements, compounds etc. Atoms: Individual elements like Fe, Mg etc. Molecules: Covalent Compounds CO, CO2, SO2 etc. Formula Units: Ionic Compounds NaCl, KBr etc.

@SabrinaXe

6 жыл бұрын

Chemistry with Melissa Maribel I thought my whole life was a lie when I didn't see you multiplying it by 3..gosh I'm so relieved now, thanks for the clarification

@infoField10

5 жыл бұрын

Chemistry with Melissa Maribel can you make another video about avogadro’s number please

@jaypeepacle8056

4 жыл бұрын

On the example at 4:05 why and how did the exponent change from 23 to 24?

@carbrickscity

4 жыл бұрын

@@jaypeepacle8056 3 x (9 x 10^23) = 3 x 9 x 10^23 = 27 x 10^23 = 2.7 x 10 x 10^23 = 2.7 x 10^24

@EhCloserLook

2 жыл бұрын

Why not just redo the video since the first problem you did has a major error in it? I'm assuming a lot of people don't check the comments; this may have caused lots of students to get confused or get this concept wrong altogether! IMO, it’s messed up that you left the video the way it is. 🤦🏻‍♂️

Studying for my chem midterm right now wouldn't be able to do it without you thank you so much!

It's crazy how you explain things so simple. My textbook is just nonsense to me. I spent last night studying and your videos helped me a lot. Thank you so much.

You are a life saver !! i have been struggling the past few weeks, and watching your videos I was able to complete and learn so many things just in one day, wish i had found your page sooner but hopefully this will be enough to help me pass the class

I wish I found you sooner! I'm on week six and I have been struggling. Your videos have been the only ones that help. I even linked your videos to people in my class because they are super helpful and easy to follow. Thank you.

THANK YOU!!! You are a great teacher and made this so much easier for me to understand. You taught it better than 2 weeks of class ever did. :)

I was so lost before watching your videos. Thank you for breaking it down. I'm doing a lab right now on avogadro's law in the "gases" chapter...just when I started to get the hang of it, they threw in percent deviation of a table (propane, butane and methane) 🥲gunna keep watching you videos to hopefully remember how to do all that. Thanks for the explanations!

i learned more in a 4:37 video than i did in my teacher’s 45 minute lecture!!!

That was so clear, concise, and entertaining - thank you!

@melissamaribel

5 жыл бұрын

Happy to hear! Thank you 😊

You help me learn so much! I learn so much from your videos with the visual explanation as well as verbal!

this is a lifesaver!!! I unfortunately failed my quiz on conversions, but now i’m understanding it!!! Thanks!!!

You’re awesome, just spent an hour trying to find the right video for what im doing thank you so much

You just saved my life!! Thank you so much, this helped me soo much!!

@melissamaribel

5 жыл бұрын

You're very welcome Camila!

Thank you so much!!! Your explanation and set up was very clear!!

Hey ! I am new on your channel and I am really happy that I found your channel. Your teaching style is awesome.💐💐💐

@melissamaribel

5 жыл бұрын

Thank you!

You are amazing. Thanks for putting in the effort of a quality presentation of the subject.

I love your videos so much I have been learning a lot more here than in class honestly. Do you think you can do a video on ionic compounds and Lewis dot structures and resonance structures?

@YMY001

3 жыл бұрын

She did one video on compounds already i think?

you saved my chemistry exam is for tomorrow love you

@jesusnevarez3506

4 жыл бұрын

I’m literally in your position a year later lmaoo

@faridfady1220

3 жыл бұрын

@@jesusnevarez3506 Same year later lmfao

@noodle5681

3 ай бұрын

@@faridfady12203 years later

Thanks for this explanation. It was very helpful.

This was so good, you helped ALOT

wow your videos are extremely helpful! Can you please do a video on finding oxidation numbers and elements being oxidized or reduced?

Your explanation is so good

thanks for ur tutorial! u made it quick and easy.

aweeee thank you Melissa 😘

And Melissa, how do I know if there is more than one step?

THANK YOU! I have a test tmrw and my teacher didnt explain it well at all but i now understand🎉

Thank you!❤️

Maribel Help!!! How do you know when to divide or multiply the given data? Thank you.

I got 1.19x10^33 when I did this, can anyone tell me how to change the settings on my TI-84 Plus calculator so that I can get the right answers? Thanks!

Thank u sooo much!

Thanks this actually really helped

I have really started to admire this women and her hard work. When I first started watching her, I just thought she was another one of those annoying chemistry teachers. However, as my Chemistry got better, I realized her whole persona and why she puts it up; it really helps with learning! I love her! She is an amazing teacher!

@melissamaribel

4 жыл бұрын

Thank you so much Muhammad! So glad I could help and haha so glad I’m not an annoying teacher 😂 Don’t be boring is a motto of mine lol

@muhammadshayanfarrukh6481

4 жыл бұрын

@@melissamaribelWell, you're doing a great job at it! Keep going! I'm recommending you here in my class and at our Chemistry department.

Love your videos they have helped me so much ! 💙

@melissamaribel

5 жыл бұрын

Thank you! So happy to hear they are helping 💕

Melissa, you are a blessing. The last time I studied chemistry in college was 1993. On May 13 of last week, I stated Chemistry 2045. I was not processing how Avogadro number work until now. You are amazing and thank you!

@MsMscoley

3 жыл бұрын

🙏🏼💕

Thank you so much!

Tnq for upload this video, this video was relly help me in chemistry

great video, thank you so much : )

Studying for my chem mock exam tmrw, amazing video

How do you know whether you divide or multiply at the end?

even after 3 years im still using this every year to study for midterms.

how did you get 4.41 * 10^24 particles of NaCl on the 1st practice problem???

You made this so easy

thank you so much You really helped me understand this

@melissamaribel

4 жыл бұрын

You’re very welcome 😊

I just noticed that you already corrected yourself with a comment, but most students won't look at the comments. They will just be confused by the video.

@hi-ru7yh

3 жыл бұрын

Most students jump right to the comments first because of their low attention span 🤔

How do you know whether to divide or multiply

can you show how to anwser the problem plz and thank you

Hi Melissa, thank you so much for your confidence and you are right I WOULD NOT GIVE YOU YOUR BRAIN BACK!! LOL...I need help with these mole problems something terrible.I know you use Avogadro when the problem says molecules, atoms, or particles, but how do you know where to put it, on top or bottom?? And the ones that have three steps are just awful. I hope you get this tonight. I'm considering moving to your neighborhood!!

thanks melissa for making great videos .

I like the Bill Nye spin on your channel. Thanks for the help, I like things that keep me awake :-)

@melissamaribel

5 жыл бұрын

You're welcome! Happy you're staying awake! 😂

thank you so much

So for the first practice problem at 3:51 i keep getting 44.081*10^23....Someone please help!!

How do you know if you multiply or divide though( I’m a returning student..it’s been a while lol)?

Thankyou so much!! I just subscribed ❤️❤️❤️

@melissamaribel

4 жыл бұрын

You're very welcome!

thank you-you are great

wonderful video!!!!!!

Thank you

Thanks for videos i need more practise problems please

What if you have a problem that wants you to find the moles of a specific element from the moles of a compound? For example, how many moles of P are in 41 moles of P4O10? Do you still use Avogadro's number?

@anneanne3337

5 жыл бұрын

no

What is the mass of a sample of MgC2 (molar mass = 59.76g) which contains 4.25x10^23 units of MgC2?

Thank you.

hello , i cannot find any video for 2.4 introduction to the periodic table and the charges for each group .. thank u

@melissamaribel

5 жыл бұрын

For an introduction to the periodic table I recommend this other youtuber's video: kzread.info/dash/bejne/lJ-VlJKKabe0ZrA.html or this one kzread.info/dash/bejne/jJtqrceRo6e8p7w.html

Melissa, at 4:05, I think "molecules of MgO" should really be "formula units" or at the very least, "particles", since MgO is really an ionic compound...?

Helping me pass Chemistry and the manicure's always poppin. Thanks

I LOVE YOUUUU YOU HAVE JUST SAVED MY LIFE 😁😁😁😁😁😁😁😁🙂🙂🙂

Sorry, I’m confused. Why is it that the first practice problem not only has 10^24, but also why is it rounded that way? When I multiplied 7.32 by Avagadro’s number, I got 44.081, and since there’s only three sig figs, why isn’t it just 44.0? Why is the decimal place off?? I think I did something wrong but I can’t tell what

Hi Melissa, I cant seem to access the practice problem questions on google drive. Is there anyway for me to find these? I love the content and it helps so much!!! I'm currently doing First year university chem in Australia :)

@melissamaribel

5 жыл бұрын

Thank you Michaela! I just fixed it.

How about this question maam? I find this difficult to solve: How many moles of C atoms, H atoms, and O atoms are in 2.5 mol of glucose, C6H12O6?

MELISSA UR AMAZING OMG

Could you do a video on electron configuration

hello i am new to this channel and on the problem about how many particles are in 7.32 moles of NaCl how did you get 4.41 x 10^24

@parachutes6288

4 жыл бұрын

She explained it try watching it again.

That was great

This is the only video that has actually helped me! Thank youuuu!

@melissamaribel

5 жыл бұрын

You're so welcome Taylor!

4:01 I got the answer 44.09*10^23 but the answer is 4.41*10^24 how come ??? Pls explain

Heck yeah! Your like smarter than my chem teacher!!!!!!

😭 Thank you so much

so, in the practice problems on this one I got all the correct numbers except the exponents...am I doing something wrong in the equation, in my calculator or both?

@melissamaribel

5 жыл бұрын

What is your set up look like for the practice problems?

But what if I have to go through a 2 step process of converting mass to moles to atoms?

You are awesome I need u now more than ever this chemistry is taking over my life. Thank u love this helpful video.

@melissamaribel

5 жыл бұрын

You are so welcome!! 💕

I love Chemistry and i love watching your videos but i'm only ten and i really love Chemistry so i'm going to keep on trying, thanks keep up the great content.

thank you so much for saving my grades :)

On the problem at 4:05 could you explain why your answer is 1.03 x 10^ -18 and not 10^28? Thank you this would really help.

@melissamaribel

5 жыл бұрын

So remember Avogadro's number has a positive exponent of 23 not negative. If you got 10^28 then you are using 6.022 x 10^ -23 and you should be using 6.022 x 10^ 23.

Interesting video I like it

How did it become - 13?

can someone pls explain how she got the exponent of -13 and i got 33

@melissamaribel

4 жыл бұрын

You are dividing not multiplying the numbers together. You accidentally multiplied them instead of dividing them. When we divide numbers in scientific notation we subtract the exponents so 10-23 = -13

Percent Yield and Net Ionic Equations please.

Wow I actually understand

mellissa you are a nice teacher . but you know what my problem is , the questions which are supposed to take a very less time , takes comparatively more time . this is cuz of a fact that I'm not allowed to use calculator for divison and multiplication purpose so it takes time for me (specially for me ) to solve those easy peasy question , resulting in a very less marks

I love chemistry😍🥰

I am having difficulty figuring out setting up the problem how do you know wether the Avorgadro number should be on top or bottom when figuring out equation?

@jurochabrito

5 жыл бұрын

girl same

@DOAU

5 жыл бұрын

You determine this by looking at the previous unit that is on top of the fraction and see what you need to cancel out. Whatever you need to cancel out on the upper left, you put on bottom right to cancel it out.

What about ions?

@3:36 why is it negative 13? I'm confused😣

@melissamaribel

5 жыл бұрын

When you divide by the same base (10) you subtract the exponents. So 10-23 is -13. You can review this math topic by watching this other video ➡️kzread.info/dash/bejne/lZ16sc6iot2aetY.html Also if you put this into your calculator correctly it will give you the correct exponent of -13.

i understand alot

For practice question #2 I got the answer 1.03x10^28. How is it the its to the power of -18? :( confused!

@melissamaribel

4 жыл бұрын

Make sure to check your set up, it should look like this: (6.21 x 10^5 molecules) x ( 1 mol/ 6.022 x 10^23 molecules) You are dividing not multiplying the numbers together. You accidentally multiplied them instead of dividing.

@patriciajones2452

4 жыл бұрын

@@melissamaribelit's the calculator .. some scientific calculators when dividing need to have the whole number in brackets

This teached me better than my actual teacher

Confused, so when you say formula units do you mean grams, mg, etc. or does the problem have to say, "Formula units?" I am using this book with a bunch of chemistry practice problems and I'm at the mole calculations section. For example it says: "How many moles of NaCl are in 10.0g of NaCl?" When I look at the answer at how to get it, they don't use avogadro's number they use 1 mol of NaCl/molar mass of NaCl. Your video says you can use avogadro's number when it says it's asking for how many "moles?"

I Love Chemistry...When I actually get what it means. Chemistry and I have lost..Well the Chemistry when it came to stoichometry. NOW I GET IT

Like others I got 10^33 not the correct 10^-13 answer. Here’s how I fixed the settings. If using a scientific calculator it is okay. I have a TI-84 plus CE. Press the mode button, then make sure it’s in SCI not (NORMAL or ENG) mode. Then for example #2 you would enter: 7.2 multiplied then “2nd” then “EE” then 10 then divide 6.022 multiplied then “2nd” then “EE” then 23 Answer will then show the correct -13 not 33 on a TI-84/PLUS/PLUS CE calculator

That was pure

Aweeeesome... Avacados Number, Whhhew!

shhhhit this got to be for high school because my prof is def not that easy lmaoo! but great videos!

@melissamaribel

5 жыл бұрын

It's for both high school and college. I have different stoichiometry videos some easy and others more advanced. Here's a more advanced question: kzread.info/dash/bejne/gZ-LuJudZ72chqQ.html I also have a new series where you can ask a specific question by filling out this form ➡️bit.ly/AskMelissaMaribel and I will make a video on your question and explain everything.