Search found 94 matches

by annikaying
Sat Mar 14, 2020 11:20 am
Forum: Administrative Questions and Class Announcements
Topic: online
Replies: 3
Views: 37

online

Does anyone know what it means for the final to be online? Do we have to print and scan or is it multiple choice or?
by annikaying
Sat Mar 14, 2020 11:19 am
Forum: Administrative Questions and Class Announcements
Topic: "Open Book" Final?
Replies: 30
Views: 576

Re: "Open Book" Final?

open book pretty much allows you any resource you have
by annikaying
Sat Mar 14, 2020 11:16 am
Forum: General Rate Laws
Topic: functional difference
Replies: 1
Views: 21

functional difference

What is the functional difference between a differential rate law and an integrated rate law?
by annikaying
Sat Mar 14, 2020 11:14 am
Forum: Zero Order Reactions
Topic: kind of reaction
Replies: 2
Views: 49

kind of reaction

What kind of reaction would be zero order?
by annikaying
Sat Mar 14, 2020 11:14 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: elementary rate law
Replies: 4
Views: 51

elementary rate law

What is the difference between an elementary rate law and an overall rate law?
by annikaying
Thu Mar 05, 2020 5:15 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: K
Replies: 5
Views: 63

K

How do you tell if K >1 given a redox reaction?
by annikaying
Thu Mar 05, 2020 4:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.7
Replies: 1
Views: 48

6L.7

Can someone explain any or all of the parts of this problem to me in regard to finding the half reaction?
AgBr(s) <-> Ag+(aq) + Br-(aq)
H+(aq) + OH-(aq) -> H2O(l)
Cd(s) + 2Ni(OH)3(s) -> Cd(OH)2(s) + 2Ni(OH)2
by annikaying
Wed Mar 04, 2020 5:30 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: acidic solution
Replies: 5
Views: 65

acidic solution

How would one write the cell diagram of reaction that is in an acidic solution? Is it any different?
by annikaying
Wed Mar 04, 2020 5:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: half reaction of cell diagram
Replies: 2
Views: 23

half reaction of cell diagram

When writing a cell diagram, does it matter which order you put the two components of the half reaction? for example if one of the half reactions is 2I-(aq) -> I2(s), does it matter which is written first?
by annikaying
Wed Mar 04, 2020 5:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: platinum
Replies: 2
Views: 30

platinum

In homework question 6L.5 part b, only one of the half reactions doesn't include a solid. However in the back of the book it says that both sides of the cell diagram include platinum and I was wondering why?
by annikaying
Sun Mar 01, 2020 2:16 pm
Forum: First Order Reactions
Topic: first order
Replies: 4
Views: 63

first order

What does it mean for a reaction if it is first order versus second order or any other order?
by annikaying
Sun Mar 01, 2020 2:15 pm
Forum: General Rate Laws
Topic: temp
Replies: 2
Views: 38

temp

How is temperature incorporated into finding rate? For example in class, one of the example problems said the temp was originally at 25 degrees celsius and then it was quickly heated to 300 degrees. How is this incorporated into the concentration vs time graph?
by annikaying
Sun Mar 01, 2020 2:13 pm
Forum: General Rate Laws
Topic: units
Replies: 9
Views: 75

units

What are the units for rate?
by annikaying
Sun Mar 01, 2020 2:12 pm
Forum: General Rate Laws
Topic: rate law
Replies: 2
Views: 38

rate law

What's the difference in finding the rate using just reactants versus both reactants and products?
by annikaying
Sun Mar 01, 2020 2:11 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: how can you tell
Replies: 11
Views: 103

how can you tell

How can you tell whether kinetics or thermodynamics controls a reaction?
by annikaying
Sun Feb 23, 2020 3:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: electrode
Replies: 4
Views: 42

electrode

What exactly is an electrode?
by annikaying
Sun Feb 23, 2020 3:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 10
Views: 60

salt bridge

What exactly is a salt bridge?
by annikaying
Sun Feb 23, 2020 3:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: movement e
Replies: 3
Views: 21

movement e

What exactly causes the e to move? And on that how exactly are they moving?
by annikaying
Sun Feb 23, 2020 3:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: neg vs pos
Replies: 9
Views: 45

neg vs pos

What does it mean for voltage to be negative verses positive?
by annikaying
Sun Feb 23, 2020 3:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: voltage
Replies: 8
Views: 48

voltage

What exactly is voltage?
by annikaying
Wed Feb 12, 2020 3:08 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: constant pressure and volume
Replies: 3
Views: 68

constant pressure and volume

How do constant pressures and volumes affect the calculations for entropy, enthalpy, and Gibbs free energy?
by annikaying
Wed Feb 12, 2020 3:07 pm
Forum: Phase Changes & Related Calculations
Topic: internal energy
Replies: 2
Views: 87

internal energy

How do constant pressure and temperature affect calculations for internal energy?
by annikaying
Wed Feb 12, 2020 3:06 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: spontaneity
Replies: 34
Views: 437

spontaneity

What is most important in deciding if a reaction is spontaneous (ex enthalpy, entropy, Gibbs free energy)?
by annikaying
Wed Feb 12, 2020 3:04 pm
Forum: Phase Changes & Related Calculations
Topic: rate of reactions
Replies: 3
Views: 117

rate of reactions

Do we need to know about the rate of reactions for the midterm?
by annikaying
Sun Feb 09, 2020 8:40 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: including phase changes
Replies: 2
Views: 26

including phase changes

How can you tell when you have to include the energy required for a phase change in a reaction?
by annikaying
Sun Feb 09, 2020 8:39 pm
Forum: Phase Changes & Related Calculations
Topic: irreversible equations
Replies: 2
Views: 31

irreversible equations

Is there a difference in equation used for when something is irreversible vs reversible besides the ones for calculating work?
by annikaying
Sun Feb 09, 2020 8:38 pm
Forum: Phase Changes & Related Calculations
Topic: reversible
Replies: 4
Views: 45

reversible

What exactly does it mean for a reaction to be irreversible? I know the definition with the infinitely small changes but that doesn't quite make sense to me on a conceptual basis.
by annikaying
Sun Feb 09, 2020 8:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: enthalpy
Replies: 3
Views: 43

enthalpy

What is the relationship between work and heat when calculating enthalpy? Not just a formula but conceptually what it means.
by annikaying
Sun Feb 09, 2020 8:36 pm
Forum: Phase Changes & Related Calculations
Topic: equipartition theorem
Replies: 1
Views: 35

equipartition theorem

What exactly is the equipartition theorem and will we need to know it for the midterm?
by annikaying
Thu Jan 30, 2020 5:02 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Celcius and Kelvin
Replies: 11
Views: 64

Re: Celcius and Kelvin

The conversion should be on the equation sheet.
by annikaying
Thu Jan 30, 2020 5:00 pm
Forum: Phase Changes & Related Calculations
Topic: State Functions
Replies: 9
Views: 66

Re: State Functions

A state function is something that is not dependent on how you get to the end result. For enthalpy, it doesn't matter how you get to the value therefore it is a state function. This also implies that state functions are additive.
by annikaying
Thu Jan 30, 2020 4:57 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: System vs Surroundings
Replies: 14
Views: 476

Re: System vs Surroundings

The system is the actual reaction and the surrounding is everything else.
by annikaying
Thu Jan 30, 2020 4:55 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Types of Systems
Replies: 4
Views: 46

Types of Systems

What are some types of closed systems we might see that don't include a piston?
by annikaying
Thu Jan 30, 2020 4:54 pm
Forum: Calculating Work of Expansion
Topic: Application
Replies: 1
Views: 27

Application

How necessary is it to truly understand the calculus behind the work of expansion? Will there be questions on the midterm that specifcally ask to solve for this?
by annikaying
Fri Jan 24, 2020 12:04 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 417

Re: Kc vs Kp

kp is used when dealing with gases and is usually given with units like atm or bar. kc is for molar concentrations and will be given as aqueous solutions.
by annikaying
Fri Jan 24, 2020 12:02 pm
Forum: Ideal Gases
Topic: test 1
Replies: 9
Views: 90

Re: test 1

No, test 1 only covers to last Friday's lecture which is outlines 1 and 2
by annikaying
Fri Jan 24, 2020 12:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibrium
Replies: 3
Views: 39

equilibrium

Do all reactions technically establish an equilibrium?
by annikaying
Fri Jan 24, 2020 11:59 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solvent
Replies: 10
Views: 52

solvent

How can you tell when a solvent is part of the reaction? For example self test 5G.3A on page 401 how was it decided which molecules are involved in the equilibrium constant?
by annikaying
Fri Jan 24, 2020 11:56 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: salt solutions
Replies: 4
Views: 35

salt solutions

Are salt solutions and buffers the same thing? If not what's the difference?
by annikaying
Thu Jan 16, 2020 5:45 pm
Forum: Ideal Gases
Topic: ph
Replies: 10
Views: 100

ph

Can ph be above 14 or below 0? Or is there a specific cap at those values?
by annikaying
Thu Jan 16, 2020 5:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: change in temp
Replies: 4
Views: 33

change in temp

Why does a reaction favor products when heated if is endothermic?
by annikaying
Thu Jan 16, 2020 5:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: weak acids and weak bases
Replies: 3
Views: 17

weak acids and weak bases

How do you perform calculations with weak acids and weak bases?
by annikaying
Thu Jan 16, 2020 5:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Protonation & Deprotonation
Replies: 9
Views: 61

Re: Protonation & Deprotonation

protonation is the addition of a proton and deprotonation is the removal of a proton. Protonation refers to bases usually and deprotonation to acids.
by annikaying
Thu Jan 16, 2020 5:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: weak acid and strong base
Replies: 2
Views: 67

weak acid and strong base

I understand how to calculate concentrations when mixing a weak acid or base with water, but what happens when mixing a weak acid and a strong base or vice versa?
by annikaying
Thu Jan 09, 2020 4:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: kc and kp
Replies: 3
Views: 28

kc and kp

What exactly is the relationship between kc and kp? Wouldn't a reaction with all its components being aqueous have a significantly lower kp than that of a reaction in the gaseous state? I guess I'm asking what is the point of calculating both?
by annikaying
Thu Jan 09, 2020 4:51 pm
Forum: Ideal Gases
Topic: kc to kp
Replies: 2
Views: 34

kc to kp

does pv=nrt only work for the individual components of K? For example if I wanted to convert kc to kp would I have to put all of the separate components into pv=nrt?
by annikaying
Thu Jan 09, 2020 4:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Why is K unitless?
Replies: 10
Views: 78

Re: Why is K unitless?

K is a ratio and therefore is moreso a comparison than a value. You can also think of the units as canceling as the units on top equal that of the bottom.
by annikaying
Thu Jan 09, 2020 4:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 3
Views: 35

K

If you have a chemical equation in which one molecule is aqueous and another in the gaseous state, when writing K would you mix using concentration and partial pressure? Or would this not happen.
by annikaying
Fri Dec 06, 2019 10:34 am
Forum: Resonance Structures
Topic: midterm #7a [ENDORSED]
Replies: 1
Views: 98

midterm #7a [ENDORSED]

Why were all of the phosphorus-oxygen bond lengths the same?
by annikaying
Fri Dec 06, 2019 10:33 am
Forum: Quantum Numbers and The H-Atom
Topic: midterm #6A
Replies: 1
Views: 94

midterm #6A

What are the possible angular momentum quantum numbers of the highest energy electrons in magnesium ions? How did you go about figuring this out?
by annikaying
Fri Dec 06, 2019 10:29 am
Forum: Sigma & Pi Bonds
Topic: test 2 #7a
Replies: 4
Views: 122

test 2 #7a

On test two for number 7a why was the answer 14 hydrogen bonding sites?
by annikaying
Fri Dec 06, 2019 10:27 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: bond strength
Replies: 2
Views: 78

bond strength

What factors affect the bond strength of an acid when going down a group?
by annikaying
Fri Dec 06, 2019 10:24 am
Forum: Hybridization
Topic: pi bonds
Replies: 1
Views: 25

pi bonds

How are pi bonds incorporated into hybridization?
by annikaying
Tue Nov 26, 2019 5:58 pm
Forum: Balancing Chemical Reactions
Topic: Balancing This Equation
Replies: 11
Views: 273

Re: Balancing This Equation

Combustion implies that the reactant given is reacting with O2.
by annikaying
Tue Nov 26, 2019 5:56 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 10
Views: 180

Re: Bond Length

You have to be given the actual bond length from previous experiments but there are general guidelines such as double bonds being shorter than single bonds.
by annikaying
Tue Nov 26, 2019 5:54 pm
Forum: Lewis Acids & Bases
Topic: oxides
Replies: 3
Views: 41

oxides

During lecture a lot of emphasize was placed on oxides and I was wondering what specifically oxides have to do with acids and bases?
by annikaying
Tue Nov 26, 2019 5:51 pm
Forum: Bronsted Acids & Bases
Topic: Difference
Replies: 3
Views: 37

Difference

What exactly is the difference between Lewis acids and bases and Bronsted acids and bases?
by annikaying
Tue Nov 26, 2019 5:50 pm
Forum: Hybridization
Topic: double bonds
Replies: 7
Views: 58

double bonds

How do double bonds affect hybridization?
by annikaying
Thu Nov 21, 2019 10:35 am
Forum: Dipole Moments
Topic: Melting points
Replies: 15
Views: 242

Re: Melting points

Intermolecular forces are the only thing that determine melting and boiling points. Therefore having a double bond doesn't affect the melting point.
by annikaying
Thu Nov 21, 2019 10:30 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Which shape
Replies: 6
Views: 55

Which shape

How do you determine if the shape formed will be polar or non polar? For example if a molecule can be either cis or trans(CCl2H2) how do you tell if you are asked to determine if the molecule is polar or non polar?
by annikaying
Thu Nov 21, 2019 10:28 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Strongest force
Replies: 6
Views: 48

Strongest force

Which intermolecular force is strongest? I though it was hydrogen bonding, but now I'm wondering if intermolecular forces involving ions are stronger.
by annikaying
Thu Nov 21, 2019 10:27 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Forces
Replies: 3
Views: 46

Forces

Are induced dipole forces the same as London dispersion forces? Also does induced dipole only occur between a polar and non polar molecule?
by annikaying
Wed Nov 13, 2019 5:17 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths in molecules
Replies: 7
Views: 71

Re: Bond lengths in molecules

The more bonds there are (triple versus single) the shorter the bond is. This is because there are more e being shared and thus both atoms are pulled in closer together.
by annikaying
Wed Nov 13, 2019 5:14 pm
Forum: Balancing Chemical Reactions
Topic: Fractions
Replies: 20
Views: 438

Re: Fractions

I would convert it to an integer as the TAs always change it and they are the ones that grade the tests and homework.
by annikaying
Wed Nov 13, 2019 5:12 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 7
Views: 159

Re: Formal Charge

formal charge = V - (L + B/2)
V - valence e
L - e in lone pairs
B - e in bonded pairs
This will give you the formal charge of one atom in a molecule. To find the formal charge add of the formal charges of all the individual atoms.
by annikaying
Wed Nov 13, 2019 5:09 pm
Forum: Empirical & Molecular Formulas
Topic: empirical = molecular?
Replies: 15
Views: 399

Re: empirical = molecular?

If the molar mass given is equal to that of the empirical formula then the chemical formula found is both the empirical and molecular formula.
by annikaying
Wed Nov 13, 2019 5:08 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 485

Re: Memorizing Conversions

Everything that is needed should be provided. However, knowing the conversions definitely helps with exams.
by annikaying
Wed Nov 13, 2019 5:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Model of H2O
Replies: 12
Views: 116

Re: VESPR Model of H2O

H2O is bent. I'm assuming we will cover molecular shapes with lone pairs sometime in the next week.
by annikaying
Sun Nov 03, 2019 9:17 am
Forum: Resonance Structures
Topic: "Equivalent" resonance structures
Replies: 2
Views: 39

Re: "Equivalent" resonance structures

A resonance structure only has a difference in the placement of double and triple bonds. I think formal charges would determine which of the resonance structures is most likely, but you only need to look at bonds to see if there is resonance.
by annikaying
Sun Nov 03, 2019 9:14 am
Forum: SI Units, Unit Conversions
Topic: midterm 1
Replies: 5
Views: 162

midterm 1

Does anyone know if Lewis acids and bases will be on the first midterm? And which topics are going to be covered?
by annikaying
Sun Nov 03, 2019 9:12 am
Forum: Lewis Structures
Topic: Exceptions to octet rule
Replies: 4
Views: 38

Exceptions to octet rule

Which elements can break the octet rule when forming lewis dot structures and is it likely or just when necessary?
by annikaying
Sun Nov 03, 2019 9:11 am
Forum: Lewis Structures
Topic: Lowest Energy
Replies: 2
Views: 28

Lowest Energy

How do you determine the lowest energy lewis structure? For example some structures break the octet rule to get the lowest energy structure. Does that mean formal charges are more important than the octet rule in determining the lowest energy?
by annikaying
Sun Nov 03, 2019 9:08 am
Forum: Trends in The Periodic Table
Topic: Exceptions
Replies: 4
Views: 32

Exceptions

What are some of the exceptions to periodic trends? For example O has a lower ionization energy than N.
by annikaying
Wed Oct 23, 2019 4:20 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs covalent
Replies: 8
Views: 345

Re: Ionic vs covalent

You can look at the electronegativity difference to determine if the bond is ionic or covalent but typically you can just go off of whether or not the two atoms are both nonmetal (which gives a covalent bond) or if they are a nonmetal with a metal (which gives an ionic bond).
by annikaying
Wed Oct 23, 2019 4:17 pm
Forum: Octet Exceptions
Topic: Max number of valence e
Replies: 6
Views: 65

Max number of valence e

What is the max number of valence e an atom can have? I know there is the octet rule but is that just where the atom is most stable?
by annikaying
Wed Oct 23, 2019 4:15 pm
Forum: Lewis Structures
Topic: Ion lewis structure
Replies: 9
Views: 94

Ion lewis structure

When drawing a lewis dot structure does it matter where in the molecule you put the added e ? For example when you have BrO- does it matter where that extra electron is added into the structure?
by annikaying
Wed Oct 23, 2019 4:13 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Compounds
Replies: 6
Views: 100

Ionic Compounds

Are ionic compounds actually bonded and if so how? I understand e are being transferred but how does this transfer differ from a covalent bond in which they are shared?
by annikaying
Wed Oct 23, 2019 4:11 pm
Forum: Lewis Structures
Topic: Valence e in d block
Replies: 5
Views: 69

Valence e in d block

How do you count the valence e in the d block? For example how many valence e does Zn have and why?
by annikaying
Sat Oct 19, 2019 3:53 pm
Forum: Limiting Reactant Calculations
Topic: Test 1 Calculator
Replies: 6
Views: 230

Re: Test 1 Calculator

You can cheat if you have a graphing calculator as you can store equations and notes in it.
by annikaying
Sat Oct 19, 2019 3:52 pm
Forum: Molarity, Solutions, Dilutions
Topic: What is Molarity?
Replies: 11
Views: 348

Re: What is Molarity?

Molarity is the ratio of the moles of a solute to the liters of the entire solution. This is used to measure the concentration of a specific amount of a substance to the entire solution.
by annikaying
Sat Oct 19, 2019 3:49 pm
Forum: SI Units, Unit Conversions
Topic: midterm/final
Replies: 18
Views: 539

midterm/final

Does anyone know if the midterm/final is going to be more about concepts or calculations? For example which is more likely an essay question or a calculation?
by annikaying
Sat Oct 19, 2019 3:47 pm
Forum: Properties of Electrons
Topic: Angstrom Conversion
Replies: 12
Views: 156

Re: Angstrom Conversion

An angstrom is equivalent to 1 x 10^-10 m. I personally compare the values of 10^x to see which way the decimal point needs to move to be in angstroms.
by annikaying
Sat Oct 19, 2019 3:43 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Memorizing electron configuration
Replies: 3
Views: 71

Memorizing electron configuration

Are there any tricks to memorizing which orbital electrons fill up first?
by annikaying
Wed Oct 09, 2019 3:36 pm
Forum: Photoelectric Effect
Topic: Threshold energy
Replies: 6
Views: 56

Re: Threshold energy

The threshold energy depends on the type of element as different elements have different properties.
by annikaying
Wed Oct 09, 2019 3:33 pm
Forum: Properties of Electrons
Topic: Polar vs Non polar
Replies: 15
Views: 1357

Re: Polar vs Non polar

Polar molecules have an uneven hold on the electrons whereas in non polar molecules the electrons are shared equally or mostly equally. You can tell just by looking at the electronegativity differences of the certain elements.
by annikaying
Wed Oct 09, 2019 3:30 pm
Forum: Photoelectric Effect
Topic: Atomic Spectra [ENDORSED]
Replies: 3
Views: 55

Atomic Spectra [ENDORSED]

Why is the line spectrum grouped in specific parts? I know it has to do with the specific releases of energy but how exactly to the two correlate?
by annikaying
Wed Oct 09, 2019 3:29 pm
Forum: Properties of Electrons
Topic: Energy
Replies: 6
Views: 85

Energy

Can an atom only take in energy in quanta amounts? I know it is released as such but if struck with light will it only move up an energy level if that specific energy requirement is met? And if so does that mean it would need a second energy requirement to move up another level?
by annikaying
Wed Oct 09, 2019 3:26 pm
Forum: Properties of Electrons
Topic: Energy Levels
Replies: 8
Views: 69

Energy Levels

I was wondering if when an electron drops two energy levels does that mean that two photons are released or is it just a photon with more energy?
by annikaying
Thu Oct 03, 2019 12:42 pm
Forum: Balancing Chemical Reactions
Topic: Products of combustion reactions
Replies: 7
Views: 115

Re: Products of combustion reactions

The products always include CO2 and H2O but there can also be additional products depending on what is being combusted. For example the combustion of caffeine (C8H10N4O2) also produces the product NO2 alongside CO2 and H2O.
by annikaying
Thu Oct 03, 2019 12:38 pm
Forum: Molarity, Solutions, Dilutions
Topic: Empirical and Molecular Formulas
Replies: 13
Views: 208

Re: Empirical and Molecular Formulas

If you are given a formula and a given mass you can calculate the molar mass of the compound and see if the two masses are equal. If they are equal then the given formula is empirical. If not, then it is a molecular formula. You also may be able to tell by checking if the ratios are all in their sma...
by annikaying
Thu Oct 03, 2019 12:34 pm
Forum: Empirical & Molecular Formulas
Topic: Finding a reactant from given products
Replies: 2
Views: 104

Finding a reactant from given products

I know in some of the hw problems there are examples in which the masses of the products are given and from there you have to find out the empirical and molecular formulas of the reactant. To solve this you eventually have to take a ratio from the atoms in the product to the reactant (ex. 1 mol H/2 ...
by annikaying
Thu Oct 03, 2019 12:28 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 31188

Re: Final Jitters

Doing practice problems usually helps me for tests. I will also say that jitters before the first test are definitely worse than following tests as you have less of an idea of what to expect. I would just prepare as best as you can and use your experience with the first test to help you study for fo...
by annikaying
Tue Oct 01, 2019 12:17 pm
Forum: Empirical & Molecular Formulas
Topic: Mass Percent Composition
Replies: 5
Views: 93

Mass Percent Composition

Is it necessary to imagine that you have 100g of a molecule when trying to figure out the empirical and molecular formulas? You are trying to convert everything to moles, so if you are originally given grams of the different chemicals in the molecule, could you not skip the conversion to mass percen...

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