Search found 85 matches

by Timmy Nguyen Dis 1I
Thu Feb 13, 2020 9:04 pm
Forum: Phase Changes & Related Calculations
Topic: Relation to entropy?
Replies: 3
Views: 14

Relation to entropy?

How do phase changes relate to entropy?
by Timmy Nguyen Dis 1I
Thu Feb 13, 2020 9:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: How do I do? [ENDORSED]
Replies: 2
Views: 33

How do I do? [ENDORSED]

What are the different ways I can find out Gibb's free energy? I know theres G = H -ST, but what else is there?
by Timmy Nguyen Dis 1I
Thu Feb 13, 2020 9:01 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Units in Entropy Equation for Volume
Replies: 4
Views: 18

Re: Units in Entropy Equation for Volume

I think entropy in general has the same unit: J/K
by Timmy Nguyen Dis 1I
Thu Feb 13, 2020 9:00 pm
Forum: Ideal Gases
Topic: initial values
Replies: 6
Views: 22

Re: initial values

Yes use the initial.
by Timmy Nguyen Dis 1I
Thu Feb 13, 2020 8:59 pm
Forum: Van't Hoff Equation
Topic: What is this? [ENDORSED]
Replies: 7
Views: 73

What is this? [ENDORSED]

What does this equation do for us?
by Timmy Nguyen Dis 1I
Sun Feb 09, 2020 11:05 pm
Forum: Calculating Work of Expansion
Topic: integration
Replies: 2
Views: 8

Re: integration

We can just use the equation thats the result of the integration.
by Timmy Nguyen Dis 1I
Sun Feb 09, 2020 11:03 pm
Forum: Ideal Gases
Topic: Gas constant
Replies: 10
Views: 24

Re: Gas constant

Look at the other units and use the one that matches.
by Timmy Nguyen Dis 1I
Sun Feb 09, 2020 11:03 pm
Forum: Ideal Gases
Topic: Gas constant
Replies: 10
Views: 24

Re: Gas constant

Look at the other units and use the one that matches.
by Timmy Nguyen Dis 1I
Sun Feb 09, 2020 11:02 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: reversible reactions
Replies: 4
Views: 17

Re: reversible reactions

It will be said if it is reversible.
by Timmy Nguyen Dis 1I
Sun Feb 09, 2020 11:01 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Change Calculations
Replies: 5
Views: 27

Re: Phase Change Calculations

It will be given.
by Timmy Nguyen Dis 1I
Sun Feb 09, 2020 11:01 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 10
Views: 38

Re: Kelvin or Celsius?

Use Kelvin
by Timmy Nguyen Dis 1I
Sun Feb 02, 2020 4:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: free work
Replies: 2
Views: 221

Re: free work

-G means that work is being done by itself, so it is spontaneous, and +G means that work is needed, so it is not spontaneous
by Timmy Nguyen Dis 1I
Sun Feb 02, 2020 4:02 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed Systems
Replies: 11
Views: 30

Re: Closed Systems

In a closed system, pressure can be applied.
by Timmy Nguyen Dis 1I
Sun Feb 02, 2020 3:52 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Systems
Replies: 4
Views: 13

Re: Systems

Open systems, the gas can move out of the space. Closed systems, something is pushing against the gas so it is somewhat contained. Meanwhile, in an isolated system, energy cannot go in or get out of the system.
by Timmy Nguyen Dis 1I
Sun Feb 02, 2020 3:51 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed system
Replies: 5
Views: 17

Re: Closed system

It can change because something might be pushing against it but the pressure of the gas could push back.
by Timmy Nguyen Dis 1I
Sun Feb 02, 2020 3:50 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Standard Enthalpy of Formation
Replies: 4
Views: 11

Re: Standard Enthalpy of Formation

The question should give it to you.
by Timmy Nguyen Dis 1I
Sat Jan 25, 2020 11:35 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 7
Views: 14

Hess's Law

What is this and what can you do with this?
by Timmy Nguyen Dis 1I
Sat Jan 25, 2020 11:34 pm
Forum: Ideal Gases
Topic: PV=NRT
Replies: 7
Views: 50

Re: PV=NRT

we do not need to know that
by Timmy Nguyen Dis 1I
Sat Jan 25, 2020 11:31 pm
Forum: Phase Changes & Related Calculations
Topic: Entropy vs Enthalpy
Replies: 9
Views: 24

Re: Entropy vs Enthalpy

Gibbs free energy = Enthalpy - Temperature * Entropy.
by Timmy Nguyen Dis 1I
Sat Jan 25, 2020 11:08 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 7
Views: 22

Re: Phase changes

Temp remains constant because the energy is being used for the object to turn into the next phase.
by Timmy Nguyen Dis 1I
Sat Jan 25, 2020 11:06 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs Water
Replies: 6
Views: 16

Re: Steam vs Water

Steam creates more severe burns because of the energy it has :).
by Timmy Nguyen Dis 1I
Sun Jan 19, 2020 4:17 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: lewis structure
Replies: 11
Views: 32

Re: lewis structure

We dont need to draw them, but its easier to understand with them.
by Timmy Nguyen Dis 1I
Sun Jan 19, 2020 4:16 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Kb vs Ka
Replies: 5
Views: 19

Re: Kb vs Ka

as said before, Kb = weak base, Ka = weak acid. Ka * Kb = Kw
by Timmy Nguyen Dis 1I
Sun Jan 19, 2020 4:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Why is K unitless?
Replies: 10
Views: 35

Re: Why is K unitless?

K is simply a ratio between molarities, so that's why it has no units.
by Timmy Nguyen Dis 1I
Sun Jan 19, 2020 4:13 pm
Forum: Ideal Gases
Topic: Ideal Gas meaning
Replies: 7
Views: 39

Re: Ideal Gas meaning

basically, when a gas is ideal, use PV = NRT, but in reality, things are slightly different due to the many different factors that are present.
by Timmy Nguyen Dis 1I
Sun Jan 19, 2020 4:12 pm
Forum: Ideal Gases
Topic: ICE Table
Replies: 11
Views: 55

Re: ICE Table

You have the initial, which is I, then the change in molarity, which is C, then the final equilibrium, which is E
by Timmy Nguyen Dis 1I
Sun Jan 12, 2020 3:45 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: What is this?
Replies: 23
Views: 132

What is this?

As title implies, what is Le Chatelier's principle, and how do we apply it?
by Timmy Nguyen Dis 1I
Sun Jan 12, 2020 3:44 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q
Replies: 6
Views: 25

Re: Q

If Q < K, then there are not enough product, so reaction goes forward.
If Q>K, then there are not enough reactants, to reaction goes backward.
by Timmy Nguyen Dis 1I
Sun Jan 12, 2020 3:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use Kc vs Kp
Replies: 7
Views: 25

When to use Kc vs Kp

As title implies, when do we use each one? Do we use (aq) in Kp? Do we use (g) in Kc?
by Timmy Nguyen Dis 1I
Sun Jan 12, 2020 3:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Rounding in K problems
Replies: 4
Views: 20

Re: Rounding in K problems

I think only the final answer is rounded.
by Timmy Nguyen Dis 1I
Sun Jan 12, 2020 3:36 pm
Forum: Ideal Gases
Topic: Units of Pressure
Replies: 8
Views: 42

Re: Units of Pressure

Usually, he'll give us something we can use to do that so I would not worry about it.
by Timmy Nguyen Dis 1I
Sat Dec 07, 2019 10:31 pm
Forum: Properties of Light
Topic: relationship between frequency and intensity?
Replies: 3
Views: 40

Re: relationship between frequency and intensity?

Intensity is not related to frequency.
by Timmy Nguyen Dis 1I
Sat Dec 07, 2019 9:54 pm
Forum: Amphoteric Compounds
Topic: acid, base, or amphoteric
Replies: 4
Views: 56

Re: acid, base, or amphoteric

you can also look at the conjugate to see if it's stable.
by Timmy Nguyen Dis 1I
Sat Dec 07, 2019 9:53 pm
Forum: Polyprotic Acids & Bases
Topic: amphiprotic vs amphoteric
Replies: 2
Views: 27

Re: amphiprotic vs amphoteric

AMphiprotic means it can accept or give protons, while amphoteric means it can be acid or base. ALl amphiprotic molecules are also amphoteric.
by Timmy Nguyen Dis 1I
Sat Dec 07, 2019 9:52 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strong Acids
Replies: 3
Views: 31

Re: Strong Acids

005321227 wrote:are these memorized or should we be able to explain these?


They should be memorized.
by Timmy Nguyen Dis 1I
Sat Dec 07, 2019 9:52 pm
Forum: Lewis Acids & Bases
Topic: Water
Replies: 7
Views: 54

Re: Water

Water is amphoteric / amphiprotic so it can be both :)
by Timmy Nguyen Dis 1I
Sat Nov 30, 2019 8:44 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 7
Views: 89

Re: Octet Rule

Formal charges are better at determining the lewis structure than octet rule I think, especially because at a certain point the octet rule is commonly broken.
by Timmy Nguyen Dis 1I
Sat Nov 30, 2019 8:42 pm
Forum: Biological Examples
Topic: How many do we need to know?
Replies: 1
Views: 35

How many do we need to know?

As the title implies, how many of these do we have to know? What is essential?
by Timmy Nguyen Dis 1I
Sat Nov 30, 2019 8:41 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: What is this?
Replies: 5
Views: 62

What is this?

What exactly do we have to know regarding ligands, coordination numbers, etc?
by Timmy Nguyen Dis 1I
Sat Nov 30, 2019 8:40 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 139

Re: Proton acceptor and proton donor?

Acids are the ones who give the proton, aka H+, while bases are the ones who receive it.
by Timmy Nguyen Dis 1I
Sat Nov 30, 2019 8:39 pm
Forum: Lewis Acids & Bases
Topic: Nitrate
Replies: 4
Views: 25

Re: Nitrate

Nitrate is NO3-, that's it. Its a polyatomic anion i think we're supposed to memorize.
by Timmy Nguyen Dis 1I
Sun Nov 24, 2019 5:48 pm
Forum: Sigma & Pi Bonds
Topic: Visualizing this
Replies: 4
Views: 51

Visualizing this

How exactly should we visualize sigma and pi bonds in a molecule?
by Timmy Nguyen Dis 1I
Sun Nov 24, 2019 5:46 pm
Forum: Hybridization
Topic: dsp3 vs sp3d
Replies: 4
Views: 33

Re: dsp3 vs sp3d

According to Lavelle, it doesn't really matter IIRC.
by Timmy Nguyen Dis 1I
Sun Nov 24, 2019 5:45 pm
Forum: Biological Examples
Topic: Examples
Replies: 1
Views: 17

Examples

What are some examples of biological coordination compounds?
by Timmy Nguyen Dis 1I
Sun Nov 24, 2019 5:43 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Definitions
Replies: 1
Views: 25

Definitions

What are the important definitions of words in this topic? Such as ligand, coordination number, coordination compound, etc?
by Timmy Nguyen Dis 1I
Sun Nov 24, 2019 5:42 pm
Forum: Naming
Topic: Testing
Replies: 1
Views: 24

Testing

What kind of problems will Lavelle probably give us for this type of topic?
by Timmy Nguyen Dis 1I
Sun Nov 17, 2019 9:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: single vs. double/triple bonds
Replies: 4
Views: 36

Re: single vs. double/triple bonds

Like the above reply, the bonded electrons stay together. At the same time, they're delocalized.
by Timmy Nguyen Dis 1I
Sun Nov 17, 2019 9:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals
Replies: 2
Views: 22

Re: Radicals

I think so, but they DO repel.
by Timmy Nguyen Dis 1I
Sun Nov 17, 2019 9:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Nonpolar
Replies: 6
Views: 48

Re: Polar and Nonpolar

Its also important to keep in mind whether there is cis (atoms on one side of the molecule) or trans (atoms on opposite sides of the molecule) because those could affect the polarity of the molecule.
by Timmy Nguyen Dis 1I
Sun Nov 17, 2019 9:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs pi bonds
Replies: 2
Views: 22

Sigma vs pi bonds

How do these affect VSEPR?
by Timmy Nguyen Dis 1I
Sun Nov 17, 2019 9:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 10
Views: 42

Re: Lone Pairs

Lone pairs affect molecular geometry because they cause repelling forces against the other atoms in the molecule
by Timmy Nguyen Dis 1I
Fri Nov 08, 2019 12:26 pm
Forum: Dipole Moments
Topic: How do i know if a molecule has a dipole moment?
Replies: 7
Views: 60

Re: How do i know if a molecule has a dipole moment?

If a molecule is not symmetrical, it is probably going to have a dipole moment.
by Timmy Nguyen Dis 1I
Fri Nov 08, 2019 12:16 pm
Forum: Electronegativity
Topic: Ionization energy and electronegativity
Replies: 8
Views: 30

Re: Ionization energy and electronegativity

electronegativity is usually a combination of ionization energy and electron affinity. That's why they usually have the same periodic trends.
by Timmy Nguyen Dis 1I
Fri Nov 08, 2019 12:13 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Strength of Cations
Replies: 8
Views: 48

Re: Polarizing Strength of Cations

When cations are smaller, that means the Effective nuclear charge is high, meaning it has a larger polarizing power.
by Timmy Nguyen Dis 1I
Fri Nov 08, 2019 12:11 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of ionic and covalent bonds
Replies: 5
Views: 24

Re: Strength of ionic and covalent bonds

Covalent bonds are the strongest. Ionic bonds such as NaCl can get dissociated.
by Timmy Nguyen Dis 1I
Fri Nov 08, 2019 12:08 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Electron Distortion
Replies: 2
Views: 18

Re: Electron Distortion

Well atoms are the ones that are polarizable, not electrons when we're talking about electron distortion. Basically, if an atom is more polarizable, it will be more likely to have its electron cloud be distorted because it has a weaker hold over the electrons!
by Timmy Nguyen Dis 1I
Sun Nov 03, 2019 2:59 pm
Forum: *Shrodinger Equation
Topic: Review
Replies: 4
Views: 70

Re: Review

For the review session I went to, the UA went over some concepts and also provided a worksheet and answers.
by Timmy Nguyen Dis 1I
Sun Nov 03, 2019 2:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atomic Orbitals in Terms of Probability
Replies: 6
Views: 73

Re: Atomic Orbitals in Terms of Probability

Basically the orbitals just represent that if you are within the orbitals, there is a possibility that you'll find the electron there.
by Timmy Nguyen Dis 1I
Sun Nov 03, 2019 2:56 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: using indeterminancy
Replies: 3
Views: 48

Re: using indeterminancy

Yes multiply 3 by 2 because the full range of the numbers is 6. Also remember to turn delta(p) into mass * delta(v)
by Timmy Nguyen Dis 1I
Sun Nov 03, 2019 2:51 pm
Forum: DeBroglie Equation
Topic: Determining Wave-like Properties
Replies: 4
Views: 39

Re: Determining Wave-like Properties

I'm still confused as to what the relationship between the deBroglie wavelength and the mass is? If an atom has a longer wavelength does that mean it has a lighter mass or? Generally, yes. Atoms with lighter mass tend to have a longer wavelength but be mindful of the velocity thats also involved in...
by Timmy Nguyen Dis 1I
Sun Nov 03, 2019 2:46 pm
Forum: SI Units, Unit Conversions
Topic: Calculate using kg or g?
Replies: 13
Views: 196

Re: Calculate using kg or g?

I think both are fine. Just do what the question is asking, and pay attention to the different units when doing dimensional analysis. For example, remember to convert to kg if you're going to use a formula involving Joules, because Joules is kg * m^2 * s^-2
by Timmy Nguyen Dis 1I
Sun Oct 27, 2019 3:11 pm
Forum: Resonance Structures
Topic: 'delocalized'
Replies: 4
Views: 34

Re: 'delocalized'

Since we don't know where electrons are exactly due to the Heisenberg uncertainty principle, when electrons are "delocalized" they are spread out across the entire molecule.
by Timmy Nguyen Dis 1I
Sun Oct 27, 2019 3:09 pm
Forum: Lewis Structures
Topic: Bond lengths
Replies: 3
Views: 24

Re: Bond lengths

I don't think that's something we'll have to do, because the bond lengths he talked about in class were experimentally observed.
by Timmy Nguyen Dis 1I
Sun Oct 27, 2019 3:05 pm
Forum: Electronegativity
Topic: Difference between electronegativity, ionization energy, and electron affinity
Replies: 5
Views: 32

Difference between electronegativity, ionization energy, and electron affinity

Hey can someone tell me the differences between these? They get used often but I get confused on which is which sometimes.
by Timmy Nguyen Dis 1I
Sun Oct 27, 2019 3:04 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 8
Views: 42

Re: Resonance

Like others said, the purpose is to show another possible combination of bonds. However, the true bond is somewhere in between due to electrons' wavelike properties.
by Timmy Nguyen Dis 1I
Sun Oct 27, 2019 3:03 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 4
Views: 28

Re: Bond Length

To add on, double bonds involve more electrons so the attraction forces are stronger, which causes double bonds to be shorter.
by Timmy Nguyen Dis 1I
Sun Oct 20, 2019 8:16 pm
Forum: *Shrodinger Equation
Topic: Wave functions
Replies: 9
Views: 68

Re: Wave functions

Alexandra Bartolome 4D wrote:Wave functions represent the probability of finding the position of an electron in an atom. They are used to describe an electron, which has wavelike properties and indeterminate momentum/position, in an atom.


Ah ok. What happens if they're negative, though?
by Timmy Nguyen Dis 1I
Sat Oct 19, 2019 9:50 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Unit for Avogadro's Number
Replies: 10
Views: 129

Re: Unit for Avogadro's Number

Avogrado's number can be used to describe any unit. It's just that any 1 mole of something = 6.02 x 10^23
by Timmy Nguyen Dis 1I
Sat Oct 19, 2019 9:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question regarding definition of molecules
Replies: 5
Views: 65

Re: Question regarding definition of molecules

A mole (6.02 x 10^23) can be a mole of anything, even money or people.
by Timmy Nguyen Dis 1I
Sat Oct 19, 2019 9:28 pm
Forum: Photoelectric Effect
Topic: E = pc vs E= mv^2/2
Replies: 2
Views: 15

E = pc vs E= mv^2/2

Hey just asking when do we use one or the other?
by Timmy Nguyen Dis 1I
Sat Oct 19, 2019 9:26 pm
Forum: *Shrodinger Equation
Topic: Wave functions
Replies: 9
Views: 68

Wave functions

Hey just asking what the wave functions represent exactly, and will we have to know actual numeric values for the functions?
by Timmy Nguyen Dis 1I
Sat Oct 19, 2019 9:21 pm
Forum: *Black Body Radiation
Topic: General Question about this
Replies: 2
Views: 50

General Question about this

Hey did we go over this at all in class? If so, what is it??
by Timmy Nguyen Dis 1I
Sun Oct 13, 2019 9:05 pm
Forum: DeBroglie Equation
Topic: Concept of a wave
Replies: 7
Views: 80

Re: Concept of a wave

Also I believe wavelike properties are only demonstrated by objects that are extremely small. While light does exhibit wavelike properties, the equation cannot be applied towards it. So... does this mean objects with wavelike properties move in a wave? or what? That's the part I'm having trouble wi...
by Timmy Nguyen Dis 1I
Sat Oct 12, 2019 11:44 pm
Forum: DeBroglie Equation
Topic: Concept of a wave
Replies: 7
Views: 80

Re: Concept of a wave

Also I believe wavelike properties are only demonstrated by objects that are extremely small. While light does exhibit wavelike properties, the equation cannot be applied towards it. So... does this mean objects with wavelike properties move in a wave? or what? That's the part I'm having trouble wi...
by Timmy Nguyen Dis 1I
Sat Oct 12, 2019 11:39 pm
Forum: Photoelectric Effect
Topic: Differences between Particle and Wave
Replies: 5
Views: 35

Re: Differences between Particle and Wave

There are two models: In the wave model the intensity of radiation is proportional to the square of the amplitude of the wave and in the particle model intensity is proportional to the number of photons. Electrons and all matters have both particle and wavelike properties. This would be known as th...
by Timmy Nguyen Dis 1I
Sat Oct 12, 2019 11:35 pm
Forum: Photoelectric Effect
Topic: Question from module
Replies: 5
Views: 43

Re: Question from module

You could just use the mass of the electron, since it's going to be one of those numbers that are given on exams.
by Timmy Nguyen Dis 1I
Sat Oct 12, 2019 7:52 pm
Forum: Photoelectric Effect
Topic: Differences between Particle and Wave
Replies: 5
Views: 35

Differences between Particle and Wave

Hey can someone please help explain the differences exactly? I'm a bit confused.
by Timmy Nguyen Dis 1I
Sat Oct 12, 2019 7:47 pm
Forum: Properties of Electrons
Topic: wavelike properties of an electron
Replies: 4
Views: 53

wavelike properties of an electron

Ok so in class Professor Lavelle showed and explained the wavelike properties of an electron. That is, when electrons are shined at a wall with 2 holes, there are detectors that sense the electrons on the other side. However, I'm still a bit confused. Does that mean the electron is moving in a wave?
by Timmy Nguyen Dis 1I
Sat Oct 12, 2019 7:44 pm
Forum: DeBroglie Equation
Topic: Concept of a wave
Replies: 7
Views: 80

Concept of a wave

Ok so I kinda get that if the wavelength of an gathered from the DeBroglie's equation can be measurable, that means that the object has wavelike properties. However, I'm still having trouble figuring out exactly what that means. Can someone help me?
by Timmy Nguyen Dis 1I
Sat Oct 05, 2019 4:47 pm
Forum: Limiting Reactant Calculations
Topic: Determining Limiting Reactant by Mole or Mass
Replies: 8
Views: 85

Re: Determining Limiting Reactant by Mole or Mass

In my opinion, it is easier to use moles, because you can just compare it to the chemical reaction.
by Timmy Nguyen Dis 1I
Sat Oct 05, 2019 4:33 pm
Forum: Properties of Light
Topic: The units for Frequency
Replies: 3
Views: 25

The units for Frequency

The unit for frequency is Hz, meaning s^-1, so for example 10 hz is just 10 / s ?? How does that work?
by Timmy Nguyen Dis 1I
Sat Oct 05, 2019 4:31 pm
Forum: Limiting Reactant Calculations
Topic: Explaining why a reactant is limiting
Replies: 4
Views: 65

Explaining why a reactant is limiting

Hey are we going to have to ever prove why a reactant is limiting?

For example

2B + A >>>> C

If we have .3 moles of B and .2 moles of A, how do we explain that B is a limiting reactant?
Is the explanation "We need .4 moles of B for .2 moles of A" acceptable?
by Timmy Nguyen Dis 1I
Sat Oct 05, 2019 4:29 pm
Forum: Significant Figures
Topic: Clarification with sig figs
Replies: 6
Views: 64

Clarification with sig figs

Wait so if the problem has the lowest sigfig as 3 eg. 8.00, the end answer should be in 3 sigfigs right? But we don't round before?
by Timmy Nguyen Dis 1I
Sun Sep 29, 2019 3:32 pm
Forum: Significant Figures
Topic: Rounding the elements
Replies: 12
Views: 116

Rounding the elements

Does anyone know how much we're supposed to round when we're using elements from the table? For example, are we supposed to use 1 or 1.008 for Hydrogen, 16 or 15.999 for Oxygen, etc.

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