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Chemistry with Dr. G
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Добавлен 12 авг 2017
Chemistry Professor at Chapman University
Curiosity in Chemistry | Chemistry with Dr. G
Curiosity is the key to deep learning. As we ask questions, we get the opportunity to pursue answers to these questions and learn so much about the world around us. I hope you stay chemically curious!
Music Licensed from Artlist
Song - All Your Friends - Instrumental Version
Artist - Icarus
Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/chemistryexplained
Music Licensed from Artlist
Song - All Your Friends - Instrumental Version
Artist - Icarus
Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/chemistryexplained
Просмотров: 303
Видео
Valence Bond Theory (VBT) Part 1 | Chemistry with Dr. G
Просмотров 20311 месяцев назад
Link to the accompanying pdf - bit.ly/VBTtutorialworksheet Valance bond theory describes how covalent bonds are formed between 2 atoms, focusing on the overlap of atomic orbitals. This video is the second part of the video series on covalent bonding and VBT. This video focuses on pi bonding (double bonds). Want more resources about General Chemistry. View my website at sites.google.com/chapman....
Valence Bond Theory (VBT) Part 2 | Chemistry with Dr. G
Просмотров 17711 месяцев назад
Link to Accompanying PDF - bit.ly/VBTtutorialworksheet Valance bond theory describes how covalent bonds are formed between 2 atoms, focusing on the overlap of atomic orbitals. This video is the second part of the video series on covalent bonding and VBT. This video focuses on pi bonding (double bonds). Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/...
VSEPR Theory Tutorial | Chemistry with Dr. G
Просмотров 22211 месяцев назад
Link to Accompanying PDF - bit.ly/vseprvideo VSEPR = Valence Shell Electron Pair Repulsion Theory. A theory to predict the molecular geometry from the bonding structure (Lewis structure) of a molecule. Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/chemistryexplained Music Licensed by Artlist Hold Me by Christopher Galovan Vacuum by Buddha Kid
Naming Binary Compounds | Chemistry with Dr. G
Просмотров 430Год назад
How do we provide the IUPAC name for ionic and molecular compounds? This video describe the process we would follow to identify the name for these binary compounds. Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/chemistryexplained
Density - Relating mass and volume | Chemistry with Dr. G
Просмотров 465Год назад
Density relates the mass and volume of a liquid. This video discusses how we might compare the densities of different substances and how we can calculate the density of a substance by measuring mass and volume. Music licensed from Artlist Artist - Dawn Song - Nuer Self Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/chemistryexplained
Pursuing your Passion into Research | MorDOR Lab
Просмотров 327Год назад
Women in Chemistry! Makena and Nayiri share their path into and through research. If you see research as unobtainable for you, they discuss how passion can lead to a project. Music - Stranger to None by Hans Johnson
Introduction to Equilibrium Reactions | Chemistry with Dr. G
Просмотров 369Год назад
Want more resources about General Chemistry. View my website at sites.google.com/chapman.edu/chemistryexplained
Computational Chemistry Research | MorDOR Lab | Chemistry with Dr. G
Просмотров 970Год назад
Computational Chemistry Research | MorDOR Lab | Chemistry with Dr. G
Screaming Gummy Bear | Chemistry with Dr. G
Просмотров 203Год назад
Screaming Gummy Bear | Chemistry with Dr. G
Mission Empirical Analysis Description | Chemistry with Dr. G
Просмотров 527Год назад
Mission Empirical Analysis Description | Chemistry with Dr. G
Mission Empirical Calculations | Chemistry with Dr. G
Просмотров 840Год назад
Mission Empirical Calculations | Chemistry with Dr. G
Mission Empirical | Chemistry with Dr. G
Просмотров 1,2 тыс.Год назад
Mission Empirical | Chemistry with Dr. G
Welcome to General Chemistry | Chemistry with Dr. G
Просмотров 8592 года назад
Welcome to General Chemistry | Chemistry with Dr. G
External Standard , Internal Standard, and Standard Addition | Chemistry with Dr. G
Просмотров 27 тыс.2 года назад
External Standard , Internal Standard, and Standard Addition | Chemistry with Dr. G
Intro to Kinetics Class Quick Review | Chemistry with Dr. G
Просмотров 1263 года назад
Intro to Kinetics Class Quick Review | Chemistry with Dr. G
Doppler Broadening + Population Ratios | Chemistry with Dr. G
Просмотров 233 года назад
Doppler Broadening Population Ratios | Chemistry with Dr. G
Chemistry with Dr. G | Welcome to CHEM 411
Просмотров 183 года назад
Chemistry with Dr. G | Welcome to CHEM 411
Lewis Structures Part 2 (Formal Charge) | Chemistry with Dr. G
Просмотров 4173 года назад
Lewis Structures Part 2 (Formal Charge) | Chemistry with Dr. G
Lewis Structures Part 3 (Resonance Structures) | Chemistry with Dr. G
Просмотров 3483 года назад
Lewis Structures Part 3 (Resonance Structures) | Chemistry with Dr. G
Activity and Electrochemical Cells Example | Chemistry with Dr. G
Просмотров 343 года назад
Activity and Electrochemical Cells Example | Chemistry with Dr. G
Weak Acids, pH, and Activity Examples | Chemistry with Dr. G
Просмотров 1294 года назад
Weak Acids, pH, and Activity Examples | Chemistry with Dr. G
Ladder Diagrams + pH Distribution Diagrams | Chemistry with Dr. G
Просмотров 1,2 тыс.4 года назад
Ladder Diagrams pH Distribution Diagrams | Chemistry with Dr. G
pH, Activity, and Strong Acids/Bases | Chemistry with Dr. G
Просмотров 1194 года назад
pH, Activity, and Strong Acids/Bases | Chemistry with Dr. G
Atomic Radius, Ionization Energy, Electron Affinity, Zeff, & Valence Electron | Chemistry with Dr. G
Просмотров 5254 года назад
Atomic Radius, Ionization Energy, Electron Affinity, Zeff, & Valence Electron | Chemistry with Dr. G
Electron Configurations, Ion Charge, and Zeff | Chemistry with Dr. G
Просмотров 5284 года назад
Electron Configurations, Ion Charge, and Zeff | Chemistry with Dr. G
Electron Configurations and Orbital Diagrams | Chemistry with Dr. G
Просмотров 4444 года назад
Electron Configurations and Orbital Diagrams | Chemistry with Dr. G
Ionic Strength, Activity and Activity Coefficients | Chemistry with Dr. G
Просмотров 6394 года назад
Ionic Strength, Activity and Activity Coefficients | Chemistry with Dr. G
Foundations of Equilibrium Reactions - Analytical Chemistry | Chemistry with Dr. G
Просмотров 1254 года назад
Foundations of Equilibrium Reactions - Analytical Chemistry | Chemistry with Dr. G
Isotopes and Atomic Mass | Chemistry with Dr. G
Просмотров 9714 года назад
Isotopes and Atomic Mass | Chemistry with Dr. G
Thank you Messi
Glad it was helpful.
I've been struggling with these concepts all week and have an analytical chem exam today, and this FINALLY made sense to me 🙌thank you for explaining each concept so clearly and thoroughly!
I'm so glad this was helpful!
Can u please explain, i am a bit confused
The neon lights use excitation of neon atoms to then emit light as the electrons relax to a lower energy level
@@ChemistrywithDrG u means excitation of electrons?
Good observation @gp1216. Considering that the electron is within the atom and the electron being excited (higher E) is synonymous with the atom being excited (higher E), we can consider it through the lens of the atom or electron within the atom being excited.
what chemical properties determine the specific heat capacities for different materials,
Great question. We can consider properties such as density and the type of bonding in the substance.
How do cups such as Stanleys, and hydroflask keep our water cold and maintain the ice for a long time?
great question! We are going to address this question when we discuss thermodynamics. The double walled structure of the cup prevents heat from getting through the cup as it is evacuated in the middle. No gas between = no heat transfer. Similar to how some double paned windows work.
In general, what do too many or too few eggs do to dough and why do they have this effect? Also, why can an allergic reaction start in the throat and then transition to the nose (ie. breathing problems, stuffy nose)?
These are some great questions. For allergies, this tends to be the area most directly exposed to the allergen, which is usually ingested or inhaled. Too few or too many eggs leads to an imbalance in the egg protein binder to the rest of the ingredients for dough.
So helpful, thank you so much !
Glad it was helpful!
Dear have you any Phd position in your lab?
No we don’t. Thanks for asking though!
U-tube!! ... I like that, l like that a lot
We gotta have fun in chemistry some times too!
Thank you sir, for your nice explanation. i have one question regarding standard addition. If the unknown concentration shows a negative signal(i.e S1(absorbance)= -0.1245) of arsenic due to matrix(salt) effect in an atomic absorption spectrometer then how i will calculate it from standard addition method? waiting for your kind response.
This seems like that you would want to reconsider your blank that you used for the calibration of the instrument. Also, the arsenic concentration might be too low and below the LOD
The concentration might be too low and below the LOD. Also, you would want to check the blank you use for calibration as they may contribute to the negative signal.
THANK UU
You're welcome!! Glad it was helpful.
Finally a video on RUclips which explains this
I am glad it was helpful. Thanks for the positive comment. What other concepts would you like to see explained or discussed?
Considering the growing interest in sustainable and green chemistry, how can principles of atom economy and energy efficiency be better integrated into industrial chemical processes to minimize environmental impact without compromising yield and efficiency? Additionally, how can recent advancements in catalysis and renewable materials contribute to more sustainable chemical manufacturing practices?
Catalysts can be used to make materials with less waste and faster. They also reduce the amount of energy needed to make industrial products, such as biodegradable plastics.
What components of a sunscreen helps protect our skin from uv exposure?
Awesome question. Depending on the sunscreen, in can be titanium (IV) oxide suspended in the sunscreen or an organic molecule like oxybenzone. These substances absorb energy in the UV range, preventing the UV light from hitting your skin.
How can anti-inflammatory medications like Advil and Aleve make it possible to engage in physical exercise without experiencing pain?
This has a lot to do with the pathways in the body that are blocked, that prevent inflammation or pain from translating from a part of the body to the brain.
how and why does caffeine work on our bodies?
Amazing question. I think this article from NIH gives a great explanation - www.ncbi.nlm.nih.gov/books/NBK223808/#:~:text=Caffeine%20increases%20intracellular%20concentrations%20of,free%20fatty%20acids%20and%20glycerol.
Why do allergic reactions to foods occur? Why do some foods, like peanuts, cause dangerous chemical reactions in our bodies, whereas others, are fine? What is going on inside our bodies that make some of us react so severely?
Many times it has to do with how our body responds, through antibodies, etc. to a chemical or substance in the allergen.
How does inhaling vapor rub bring sinus relief? Also, what part of a molecule causes a different smell?
One of the major components of vapor rubs is menthol. This article from NIH gives a good overview of how menthol reacts to our airways. www.ncbi.nlm.nih.gov/pmc/articles/PMC3628651/
How do botanical extracts and plant-derived ingredients impact skincare formulations?
In a way, these extracts come from natural products and get extracted many times via steam distillation. The steam is passed over leaves (such as Eucalyptus), which "dissolves" the oil from the leaves, then they are cooled and the water vapor separates from the oil since they have different boiling point temperatures (and vapor pressures at the same temperature)
How are instant ramen packs produced so that they become real noodles when hot water is added?
When they are first produced, they are air dried (or freeze dried) to remove the water content, which helps the noodles last longer. Then we just add hot water, which quickly cooks the partially cooked noodles and you have a quick meal. :)
What makes a "fluorescent" highlighter marker so bright?
Amazing question! This is because the highlighters actually contain molecules that fluoresce! They absorb the light energy from the visible spectrum, then they emit their own light at a different wavelength, which in a way they "glow." This added fluorescent emission causes the highlighters to be even brigher than normal pigments. Normal pigments simply reflect light at a specific wavelength, which is why they are not as bright.
how do fever reducers actually lower your fever?
Such a great question, and this article by NIH gives a better answer than I ever could. pubmed.ncbi.nlm.nih.gov/23545161/
how are some materials heat resistant like certain spatulas but not others
great question, they are not able to transfer heat as well. They have a high capacity to prevent molecular KE transfer (heat) and do not promote the movement of KE through their materials.
Why is it that chlorine damages hair? What happens to our hair when chlorine is damaging it?
Such a fantastic question Natalie. The primary mechanism that causes hair damage from exposure to pool chlorine is that the sodium hypochlorite (pool chlorine) can dissolve and remove your hair oils, which makes your hair more susceptible to air and sun damage.
I have always been curious as to why water bottles have expiration dates on them. Why are they there?
Great observation! It is not necessarily that the water in the bottles expire, but there is a slow leaching of substances from the plastic of the bottle into the water and at a certain point, the concentration of leached materials gets too high to be considered safe and the water "expires."
What in caffeine gives people energy in a short amount of time?
Amazing question. I think this article from NIH gives a great explanation - www.ncbi.nlm.nih.gov/books/NBK223808/#:~:text=Caffeine%20increases%20intracellular%20concentrations%20of,free%20fatty%20acids%20and%20glycerol.
What chemical reaction occurs in brain decay such as dementia?
fantastic question Isabella. This has a lot to do with the affected structure of some proteins, but this article from NIH gives a good overview of this - www.nia.nih.gov/health/alzheimers-causes-and-risk-factors/what-happens-brain-alzheimers-disease#:~:text=In%20Alzheimer's%20disease%2C%20however%2C%20abnormal,the%20synaptic%20communication%20between%20neurons.
How do anti-inflammatory medicines like Advil allow you to do physical activity with less pain?
This has a lot to do with the pathways in the body that are blocked, that prevent inflammation or pain from translating from a part of the body to the brain.
How is plastic made? What makes plastic strong, flexible, and relatively cheap to make?
Plastics usually start from natural gas or oil and through a few chemical reactions. Usually, the smaller molecules, like ethane and propane, are dehydrogenated to form ethylene or propylene. These are then polymerized (connected together in long chains of many ethylene or propylene molecules bonded together), which forms the plastics. That is why plastic bottles can be labeled as polyethylene or polypropylene.
What chemical reactions occur during tooth decay? Why are some people more prone to tooth decay than others?
many times, tooth decay occurs from bacteria, when the bacteria creates acidic compounds that are released onto the teeth, which causes the teeth to dissolve. Think of how vinegar (weak acid acetic acid) can dissolve an egg shell, but much slower in our mouth on our teeth.
What is the difference in chemistry of a perfume thats lasts a long time versus a perfume that fades quickly?
This can be influenced by many things. The size of the molecule that we smell with the perfume, the air movement (wind, air purifiers), and the diffusion of other molecules. Great question. Many times, the larger the molecule that we smell from the perfume, the faster it will deposit out from the vapor or gas phase as gravity pulls it back to the surface.
How do some cooking oils have a higher or lower smoking point?
Fantastic question. We will think about this when we focus on intermolecular forces, molecular shapes, and interactions
How do Hot Hands work, and how do they get warm just by shaking and holding them?
This is such a timely question! We are actually going to use those in class on the first day!
How do certain ingredients in makeup interfere with one another to impact the longevity and appearance of the look?
Amazing question. We will consider interaction of molecules based on structure during class and hope you get to think in depth about the interaction of molecules then!
You're so underrated! Such clear explanation!!
Thank you very much. I appreciate the feedback.
So with internal standard, am i still getting a conc v signal graph nd using it to find conc of unknown?
You will be using a comparison. You will have a standard solution that has a known amount of the analyte you are interested in quantifying (for example caffeine) and a known internal standard concentration added (for example benzoic acid) and get a signal for both caffeine (analyte) and benzoic acid (internal standard). Then you will add the same amount of benzoic acid to your unknown solution as an internal standard. Get the signal for both caffeine and benzoic acid, then compare the signals for caffeine and benzoic acid from the standard solution to the unknown solution.
Good! thank you for sharing!
Glad it was helpful
Very insightful. Thank you for the refresher.
Glad it was helpful!
Good morning. What should I do to understand if I have matrix effect?
You could think about measuring an external standard with a known concentration with the instrument. Then dope in the same standard analyte amount into the sample and see if you get the same signal increase in the doped standard as in the external standard. For example, an external standard with a concentration of 0.2 M gave a signal of 0.5. The sample gives a signal of 0.3 for the analyte. If the sample doped with 0.2 M gives a signal of 0.8 (the sum of the sample and the external sample signal) then there is no matrix effect. However if it differs from this then you know there is a matrix effect.
this was very helpful, thank you!
Glad it was helpful!
Great thank you! I have a question. how should I specify the maximum and minimum range for calibration carve while I have no idea about the concentration in my sample?
Great question. If you are unaware of the concentration of your sample, you will want to do some research about the instrument you are using. What is the linear range possible with the instrument? What is the LOD or LOQ? Then, do a first test of your sample with a dilution, to make sure that the pure sample will not overload your detector or your analytical system. If it is low, then analyze the sample at higher and higher concentrations, until you get a significant signal.
@@ChemistrywithDrG thank you for replying 🙂 so helpful !
@@za7607 Glad it was helpful!
Thank you so much, sir! This video is really helpful.
Glad it was helpful! Thank you for letting me know.
We where unable to see the formula
thank you for letting me know. I made sure to change the way this was done for future videos.
Enthalpy in chemistry is quite something else. This is pure physics.
I appreciate the connection you see between chemistry and physics. In chemistry, we tend to focus on the connection of enthalpy to chemical reactions.
Life saver 🩷
Glad it was helpful
Build up of pressure?
thanks for sharing! I will post the answer on Sunday.
I think it's because there is gun powder in the TNT
great thoughts, but what about the gun powder reaction does this?
@@ChemistrywithDrG maybe there is a chemical that is highly reactive to the fire when it is heated a reaction happens
What a cool reaction!
Yes. I think so too Kevin!
thank you , keep it up
Glad to hear it is helpful.
Great video, thanks!
Great. Glad you liked it.