Search found 37 matches

by Michelle Nguyen 2C
Sun Nov 22, 2020 7:23 pm
Forum: Ionic & Covalent Bonds
Topic: Rules of ionization energy
Replies: 17
Views: 50

Re: Rules of ionization energy

Ionization energy increases going right on the periodic table because the number of protons in the nucleus increases, the ionization energy or attraction will increase. The nucleus brings in the electrons closer together because of the increase in attraction. Ionization energy will then decrease goi...
by Michelle Nguyen 2C
Sun Nov 22, 2020 7:16 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8203
Views: 1432541

Re: Post All Chemistry Jokes Here

Why did the attacking army use acid? To neutralize the enemy's base!
by Michelle Nguyen 2C
Sun Nov 22, 2020 7:11 pm
Forum: Student Social/Study Group
Topic: How to relax after midterms
Replies: 48
Views: 100

Re: How to relax after midterms

I usually destress from midterms by taking a nap or drawing a doodle afterwards to let the test stress go away :')
by Michelle Nguyen 2C
Sun Nov 22, 2020 7:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 291
Views: 135954

Re: Saying Thank You to Dr. Lavelle

Mr. Lavelle, Thank you for always being transparent with deadlines! The lectures are easy to understand, and has helped me with clarification when reading the textbook. Thank you for updating the website whenever needed, and I am having a great time in your class :') Can't wait to have 14B! Sincerel...
by Michelle Nguyen 2C
Sun Nov 22, 2020 6:59 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions Order
Replies: 30
Views: 144

Re: Balancing Chemical Reactions Order

I don't think there is a specific order you need to go in! I was told to balance H's and O's first in HS, and that has helped me out, and hopefully that can help you out too. :)
by Michelle Nguyen 2C
Sun Nov 15, 2020 11:53 am
Forum: Photoelectric Effect
Topic: Lyman Series
Replies: 30
Views: 143

Re: Lyman Series

Yes, with the Lyman series, just assume that the final stage is n=1!
by Michelle Nguyen 2C
Sun Nov 15, 2020 11:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorizing the Different Shapes
Replies: 4
Views: 26

Memorizing the Different Shapes

We do not have much names of the molecular shapes and bond structure to memorize for Midterm 2! But once we start learning more VSEPR shapes, would we be expected to memorize all the names and bond angles of the shapes?
by Michelle Nguyen 2C
Sun Nov 15, 2020 11:38 am
Forum: Significant Figures
Topic: 0's
Replies: 19
Views: 113

Re: 0's

Trailing zeros after a decimal place count! 20.00 would count as 4 sig figs, but if there was no decimal place like 200, it would only be 1 sig fig
by Michelle Nguyen 2C
Sun Nov 15, 2020 11:36 am
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 18
Views: 44

Re: Electronegativity

We would only need to know the general trend of electronegativity across the periodic table!! We do not need to know the exact numbers, I think we would get a table for the exact electronegativities for each element. :)
by Michelle Nguyen 2C
Sun Nov 15, 2020 11:32 am
Forum: Formal Charge and Oxidation Numbers
Topic: Clarification on Oxidation Numbers
Replies: 2
Views: 11

Clarification on Oxidation Numbers

Sometimes, I get confused between formal charge and oxidation numbers. Can someone tell me the difference between the two?
by Michelle Nguyen 2C
Sun Nov 08, 2020 8:18 am
Forum: Photoelectric Effect
Topic: Units for energy
Replies: 11
Views: 85

Re: Units for energy

For Hz, it is 1/s = Hz. For Joules, it is 1 J= 1 kg m^2/s^2. Hope this helps!
by Michelle Nguyen 2C
Sun Nov 08, 2020 8:14 am
Forum: SI Units, Unit Conversions
Topic: picometer conversion
Replies: 13
Views: 65

Re: picometer conversion

To get picometers, it would be 1m = 1*10^12 pm.
by Michelle Nguyen 2C
Sun Nov 08, 2020 8:11 am
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 63

Re: Photoelectric Effect

Yes the excess energy is still classified as kinetic energy. If the work function is less than the energy of a photon, then the 'excess' kinetic energy of the electron will result as the difference. Since electrons have mass, this energy would be kinetic. Thank you! This was a good explanation that...
by Michelle Nguyen 2C
Sat Nov 07, 2020 11:57 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 178
Views: 34442

Re: Final Jitters

Before finals, I would just take a deep breath in and out to calm down! It's already a big accomplishment to make it this far into the quarter, let alone take the test. :) If you need to study at the last minute, I suggest studying the second to last night before the test. Cram during that time, and...
by Michelle Nguyen 2C
Sat Nov 07, 2020 11:50 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula - Whole Number Ratio
Replies: 9
Views: 67

Re: Empirical Formula - Whole Number Ratio

I do not think that there is a cutoff for rounding, especially since the numbers just tend to be very close to round. There would be "cutoffs" for when we should round, such as having _.33 and then multiplying by 3 to get the closest number.
by Michelle Nguyen 2C
Fri Nov 06, 2020 9:24 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf
Replies: 15
Views: 68

Re: E=hv vs E=hf

The difference usually depends on the context of the problem. Sometimes when v is used as velocity, f is used for frequency.
by Michelle Nguyen 2C
Sun Nov 01, 2020 4:01 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations Coefficient Question
Replies: 15
Views: 60

Re: Balancing Equations Coefficient Question

When that happens, try to multiply it to get the lowest coefficient possible. For instance, if you have 7.5, multiply it by 2 to get 15. If you have 3.33, multiply by 3 to get 10. It's important to look at the decimals to see what number you should multiply by.
by Michelle Nguyen 2C
Sun Nov 01, 2020 3:58 pm
Forum: SI Units, Unit Conversions
Topic: eV to Joules (Defining these Units) Question
Replies: 12
Views: 59

Re: eV to Joules (Defining these Units) Question

eV stands for electron volts, and the conversion is 1eV = 1.602*10^-19 J
by Michelle Nguyen 2C
Sat Oct 31, 2020 11:05 pm
Forum: Lewis Structures
Topic: Dot order
Replies: 11
Views: 85

Re: Dot order

The only rule for the Lewis Dot structure that I remember is that the first four electrons have to fill up each of the four sides before adding on the next four. For the non-noble gases after four electrons, I don't think the placement of the electrons matter.
by Michelle Nguyen 2C
Sat Oct 31, 2020 11:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8203
Views: 1432541

Re: Post All Chemistry Jokes Here

"Did you know that oxygen went for a second date with potassium?"
"How did it go?"
"It went OK2!"
by Michelle Nguyen 2C
Sat Oct 31, 2020 10:59 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 153
Views: 105458

Re: Reading the textbook [ENDORSED]

For me, I usually read the textbook after going through the lectures. The lectures have everything condensed so that it is easier to grasp the concepts when you read the textbook for more specific details. It's really easy to get lost in the vocabulary and equations (as well as the formatting) of th...
by Michelle Nguyen 2C
Sat Oct 24, 2020 11:33 pm
Forum: Limiting Reactant Calculations
Topic: Actual yield
Replies: 20
Views: 144

Re: Actual yield

Usually, the actual yield will be given to you while the theoretical yield will be calculated!
by Michelle Nguyen 2C
Sat Oct 24, 2020 11:31 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Roman Numerials Next to Metals
Replies: 3
Views: 44

Re: Roman Numerials Next to Metals

Roman numerals show up most often in transition metals, as depending on what they bond with, they could have different charges. The main approach is when you're given a formula, know the charge of the other atom and then you would know the charge of the transition metal. For example, if you are give...
by Michelle Nguyen 2C
Sat Oct 24, 2020 11:25 pm
Forum: Balancing Chemical Reactions
Topic: L.39 Fundamental Question
Replies: 3
Views: 37

Re: L.39 Fundamental Question

Yes, oxygen air would be oxygen gas! Oxygen is a diatomic particle, so it would be written as O2.
by Michelle Nguyen 2C
Sat Oct 24, 2020 11:12 pm
Forum: *Black Body Radiation
Topic: Midterm
Replies: 14
Views: 207

Re: Midterm

Black body radiation will not be in the midterm. If you do want to know a little bit about it, black body radiation can absorb all light, but we cannot see that since it does not reflect light.
by Michelle Nguyen 2C
Sat Oct 24, 2020 11:08 pm
Forum: Significant Figures
Topic: 40951. 3 Sig Figs
Replies: 5
Views: 42

Re: 40951. 3 Sig Figs

Lillian Ma 1L wrote:You could write it in scientific notation so that it would be 4.10x10^4, that way the 0 is after the decimal point and counts as a sig fig.

I agree with this, especially since it is a trailing zero after the decimal point
by Michelle Nguyen 2C
Sat Oct 17, 2020 7:43 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular formula from shape
Replies: 5
Views: 75

Re: Molecular formula from shape

For finding the molecular formula, no the structure and double bonds do not hold significance. It's basically counting up how many elements and how many of each element there are. However, if you are trying to find the Lewis structure from the molecular formula, you would have to draw it out, and th...
by Michelle Nguyen 2C
Fri Oct 16, 2020 1:08 am
Forum: Empirical & Molecular Formulas
Topic: Empirical or Molecular
Replies: 11
Views: 100

Re: Empirical or Molecular

You can tell when you are given the molar mass of the molecule! If you find the total mass of the molecule you already found after mass percent composition, and it is the same as the given molar mass, then you have found the molecular formula. If the total mass if the molecule you have solved for is...
by Michelle Nguyen 2C
Fri Oct 16, 2020 1:03 am
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 350

Re: m vs nm

Like others have said, it's not really important to convert the final answers all the way to nanometers. The biggest thing would be to remember that the formulas for frequency are calculated in meters, so that there wouldn't be a slip-up and writing down something like "1.56*10^-7 nanometers&qu...
by Michelle Nguyen 2C
Fri Oct 16, 2020 1:00 am
Forum: Properties of Electrons
Topic: The Nuclear Model of an Atom: e/m
Replies: 2
Views: 62

Re: The Nuclear Model of an Atom: e/m

Yes it does! Thank you so much! :)
by Michelle Nguyen 2C
Wed Oct 14, 2020 8:57 pm
Forum: Properties of Electrons
Topic: The Nuclear Model of an Atom: e/m
Replies: 2
Views: 62

The Nuclear Model of an Atom: e/m

Hi! I was reading the textbook in Focus 1, and I saw that there was a ratio "e/m, the ratio of the magnitude of the electron’s charge e to its mass m." I am overall just really confused on the concept because of the values of e=1.602×10^−19 C and m=9.109×10^−31 kg. Can someone please expla...
by Michelle Nguyen 2C
Wed Oct 14, 2020 8:41 pm
Forum: Significant Figures
Topic: Easy 3 Rules
Replies: 9
Views: 97

Re: Easy 3 Rules

Thank you so much! My biggest problem has been just figuring out the trailing zeros, but these rules helped, so thank you. :)
by Michelle Nguyen 2C
Fri Oct 09, 2020 9:04 pm
Forum: General Science Questions
Topic: Taking Notes on Textbook Readings
Replies: 13
Views: 103

Re: Taking Notes on Textbook Readings

For me, I usually only take notes on the textbook if I believe it is in important. Like stated above, if lecture content is in the textbook, then I won't write it down because it would probably already be in my notes. If the textbook clarifies something from the lecture, I usually write it in the ma...
by Michelle Nguyen 2C
Fri Oct 09, 2020 8:58 pm
Forum: Electronegativity
Topic: Periodic Table Trend
Replies: 22
Views: 239

Re: Periodic Table Trend

Electronegativity increases going right on the periodic table because the number of protons in the nucleus increases, the electronegativity or attraction will increase. The nucleus brings in the electrons closer together because of the increase in attraction. Electronegativity will then decrease goi...
by Michelle Nguyen 2C
Thu Oct 08, 2020 1:08 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 200
Views: 141237

Re: Rusty on High School Chem [ENDORSED]

Despite taking AP Chemistry only last year at my high school senior year, I still feel quite rusty on chemistry overall. I am just glad that Dr. Lavelle is taking time to help students learn and review the fundamentals before going straight into the intense work. Sources that have helped me (besides...
by Michelle Nguyen 2C
Thu Oct 08, 2020 1:00 pm
Forum: Balancing Chemical Reactions
Topic: States of Matter in Chemical Equations
Replies: 13
Views: 83

Re: States of Matter in Chemical Equations

Hi! I think it would be best to write the states of matter of the products and reactants while balancing chemical equations. They are written in the equation in Dr. Lavelle's lectures, and also they would be good practice! The states of matter of the products and reactants also become really importa...
by Michelle Nguyen 2C
Thu Oct 08, 2020 8:37 am
Forum: SI Units, Unit Conversions
Topic: Significant Figures Using the Periodic Table
Replies: 13
Views: 83

Re: Significant Figures Using the Periodic Table

For the Sapling homework online, I usually would just use the period table provided from the Sapling learning (^like the one above). For exams, we should just wait to see if the exam contains a periodic table along with the questions. Usually, the first two decimal places would be more common to see!

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