## Search found 101 matches

Sun Feb 16, 2020 5:59 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 3/2R & 5/2R
Replies: 9
Views: 42

### Re: 3/2R & 5/2R

Cp is constant pressure (5/2R) Cv is constant volume (3/2R)
Sat Feb 15, 2020 3:19 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Joules or KJ?
Replies: 14
Views: 38

### Re: Joules or KJ?

I don't think it matters unless the question specifically asks for a unit
Sat Feb 15, 2020 3:19 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy
Replies: 5
Views: 13

### Re: Gibbs free energy

yes, gibbs free energy is a state function
Sat Feb 15, 2020 3:18 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U = 0
Replies: 7
Views: 24

### Re: Delta U = 0

for an isothermal process
Sat Feb 15, 2020 3:17 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Negative work
Replies: 10
Views: 24

### Re: Negative work

when your system does work. so in this class, most of the time its when a gas expands.
Sat Feb 15, 2020 3:17 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Boltzmann Equation
Replies: 10
Views: 24

### Re: Boltzmann Equation

You use it to find residual energy. Its useful if you have the number of particles and the amount of states it can be in
Sun Feb 09, 2020 7:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp/Cv
Replies: 7
Views: 27

### Re: Cp/Cv

i think just assume constant pressure.
Sun Feb 09, 2020 7:26 pm
Forum: Phase Changes & Related Calculations
Topic: Heating Curve Phase Changes
Replies: 11
Views: 28

### Re: Heating Curve Phase Changes

It takes energy to change a phase from one to another. For example, if you're heating Ice into liquid water, it'll take a certain amount of energy to get it from a solid to a liquid. This is the reason why steam at 100 degrees Celsius causes harsher burns than liquid water at 100 degrees Celsius (be...
Sun Feb 09, 2020 7:23 pm
Forum: Administrative Questions and Class Announcements
Topic: memorizing things?
Replies: 13
Views: 54

### Re: memorizing things?

i think all the equations are given to us? You will have "memorize"/understand some conceptual things because not everything is calculations
Sun Feb 09, 2020 7:21 pm
Forum: Administrative Questions and Class Announcements
Topic: slides
Replies: 8
Views: 50

### Re: slides

no slides : (
Sun Feb 09, 2020 7:21 pm
Forum: Phase Changes & Related Calculations
Topic: Heat & Temperature of Phase Changes
Replies: 5
Views: 14

### Re: Heat & Temperature of Phase Changes

It takes energy to change phases. (heat of vaporization, heat of fusion)
Sun Feb 09, 2020 7:19 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Second Law Thermodynamics
Replies: 4
Views: 21

### Re: Second Law Thermodynamics

yeah, the second law says that entropy of the universe is increasing
Sun Feb 02, 2020 1:43 pm
Forum: Phase Changes & Related Calculations
Topic: Multiple Phase Changes
Replies: 4
Views: 17

### Re: Multiple Phase Changes

You have to account for energy it takes for changes in phases and the difference in specific heat for different phases.
Sun Feb 02, 2020 1:38 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Constant pressure
Replies: 19
Views: 70

### Re: Constant pressure

Constant external pressure
Sun Feb 02, 2020 1:38 pm
Forum: Calculating Work of Expansion
Topic: Gas constant
Replies: 5
Views: 24

### Re: Gas constant

There is a chart of gas constants. Match up R with the correct units.
Sun Feb 02, 2020 1:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal energy = State function
Replies: 4
Views: 16

### Re: Internal energy = State function

Internal energy remains constant throughout the reaction (first law of thermo) so it doesn't matter how you get from the initial to final values.
Sun Feb 02, 2020 1:36 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Phase change
Replies: 20
Views: 47

### Re: Phase change

Sun Feb 02, 2020 1:36 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Definition of First Law
Replies: 9
Views: 17

### Re: Definition of First Law

It's conservation of energy: energy is can't be created or destroyed. So the total energy of a internal system remains constant.
Sun Feb 02, 2020 12:54 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy
Replies: 4
Views: 18

### Re: Entropy

Sun Jan 26, 2020 9:05 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Negative Square Root solving an ICE box
Replies: 13
Views: 31

### Re: Negative Square Root solving an ICE box

Trying doing the opposite of what you did (i.e. since its -b plus or minus ... , try minus if you did plus and plus if you did minus)
Sun Jan 26, 2020 8:45 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure & temperature in chemical equilibria
Replies: 3
Views: 14

### Re: Pressure & temperature in chemical equilibria

Pressure shifts the reaction to the side with the least moles of gas if you add gas and the opposite if you remove gas

Temperature depends on whether or not the reaction is endothermic or exothermic
Sun Jan 26, 2020 5:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH
Replies: 7
Views: 34

### Re: pH

You would probably take the 10^-pka to convert it into Ka and then make a ICE table to find the concentration of H+ ions. After that, you would take the -log of the H+ concentration.
Sun Jan 26, 2020 5:43 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs Water
Replies: 4
Views: 13

### Re: Steam vs Water

It takes energy to convert liquid into a gas. During this period of time, more energy is added to the substance (water) without changing the temperture. Thus, you can have a liquid and a gas at the same temperature but the gas would have much more energy
Sat Jan 25, 2020 9:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 4
Views: 19

### Re: Acid and Bases

Make an ICE table and solve for H+ concentration. Find the pH by taking the -log of it, and then subtract that value from 14 to find poh
Sat Jan 25, 2020 9:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Burns: Steam or Water
Replies: 4
Views: 17

### Re: Burns: Steam or Water

It takes energy for any substance to move from liquid to gas state. During this period in which bonds are being broken, energy added to the substances does not increase the temperature. Therefore, you could have steam that is 100 degrees with more energy compared to 100 degree water.
Sat Jan 25, 2020 9:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 3
Views: 18

### Re: Acid and Bases

Usually, you would look at Ka value and set up an ICE table; however, since sulfuric acid is an strong acid, the reaction goes to completion and you can just find the concentration of [H+] via stoich and then take the -log of it.
Sat Jan 25, 2020 9:51 pm
Forum: Phase Changes & Related Calculations
Topic: State Function
Replies: 7
Views: 24

### Re: State Function

the path a reaction takes does not change the enthalpy of the reaction
Sun Jan 19, 2020 9:03 pm
Forum: General Science Questions
Topic: test 1
Replies: 8
Views: 46

### Re: test 1

It's during your discussion this week
Sun Jan 19, 2020 6:24 pm
Forum: Phase Changes & Related Calculations
Topic: lecture on 1/17
Replies: 3
Views: 29

### Re: lecture on 1/17

On Friday, we didn't really learn new material. We just did application of what we learned and some problems
Sun Jan 19, 2020 6:23 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 27
Views: 80

### Re: X was ignored

The value of x changes 0.1 so little that it's negligible
Sun Jan 19, 2020 5:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE tables
Replies: 3
Views: 15

### Re: ICE tables

You usually use ICE tables to find the concentration of a reactant or product given that the reaction does not go to completion (at equilibrium there are both reactants and products still being formed).
Sun Jan 19, 2020 5:33 pm
Forum: Ideal Gases
Topic: response to change in equilibria
Replies: 3
Views: 10

### Re: response to change in equilibria

The easiest way to think about it is if you have 2 moles of gas on onside and 1 mole of gas on the other. If you increase the pressure, the reaction will favor the side with 1 mole of gas.
Sun Jan 19, 2020 5:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pH vs. pOH
Replies: 13
Views: 30

### Re: pH vs. pOH

to calculate pOH. You find the concentration of OH- molecules and then take the -log[OH-] to find the pOH
Sun Jan 19, 2020 5:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pKa
Replies: 13
Views: 23

### Re: pKa

Lower pKa means a stronger acid
Sun Jan 19, 2020 5:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Problem 6D.15
Replies: 1
Views: 19

### Re: Problem 6D.15

Sun Jan 19, 2020 12:51 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Biological examples- ATP hydrolysis, osmotic pressure
Replies: 1
Views: 18

### Re: Biological examples- ATP hydrolysis, osmotic pressure

There some stuff on page 442 of the textbook. You should just go through the chapters and find these sections
Tue Jan 14, 2020 6:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1
Replies: 7
Views: 38

### Re: Test 1

We'll probably go over what we will have to know on the test this week.
Tue Jan 14, 2020 6:21 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and exothermic reactions
Replies: 11
Views: 36

### Re: Endothermic and exothermic reactions

Endothermic reactions favor product formation if the temperature increases and vice versa. Exothermic reactions favor reactant formation if temperture increase. The opposite is true if temperture decreases. Equations tend to resist change by doing the opposite of what is happening around them
Tue Jan 14, 2020 6:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constants table
Replies: 4
Views: 21

### Re: Equilibrium constants table

Temperature is how you decide between the three. There should be a colmum that shows temperature for and a given K for that
Tue Jan 14, 2020 6:15 pm
Forum: General Science Questions
Topic: Test 1 [ENDORSED]
Replies: 13
Views: 101

### Re: Test 1[ENDORSED]

it's week 3 during your discussion i think
Tue Jan 14, 2020 6:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 8
Views: 37

### Re: Autoprotolysis

it's proton transfer between two of the same atom. one of them acts as a bronsted acid and the other as a bronsted base.
Sat Jan 11, 2020 2:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure
Replies: 7
Views: 23

### Re: Partial Pressure

Yeah its only used for gases. Every gas has a partial pressure and when all the partial pressures get added together, you get the total pressure of the system.
Wed Jan 08, 2020 10:33 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 19
Views: 70

### Re: Understanding Q

Yes, solving for Q is the same way you would solve for K
Wed Jan 08, 2020 10:33 pm
Forum: Ideal Gases
Topic: PV=nRT equation manipulation
Replies: 13
Views: 79

### Re: PV=nRT equation manipulation

You can change the equation around so that you can find the pressure of elements which helps you find the equilibrium for gases
Wed Jan 08, 2020 10:25 pm
Forum: Ideal Gases
Topic: Ideal gas constant R
Replies: 10
Views: 423

### Re: Ideal gas constant R

It depends if the pressure given is in atm or pascals
Wed Jan 08, 2020 10:17 pm
Forum: Ideal Gases
Topic: non gases
Replies: 3
Views: 239

### Re: non gases

Yes, the ideal gas law only applies to gases
Wed Jan 08, 2020 10:13 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 13
Views: 64

### Re: Understanding Q

Yeah you only count things that are in aqeuous states and gas states if you are calculated the equilibrium for pressure
Sat Dec 07, 2019 11:59 pm
Forum: Identifying Acidic & Basic Salts
Topic: 6D11 part e
Replies: 1
Views: 38

### 6D11 part e

Decide whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. Write a chemical equation to justify your answer: AlCl3 The Cl doesn't factor into pH since it came from a strong acid. So you use the Al which would be Al3+ as an ion. But the solution...
Sat Dec 07, 2019 10:24 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: acid constants
Replies: 1
Views: 24

### Re: acid constants

no i dont think.
Sat Dec 07, 2019 9:20 pm
Forum: Lewis Structures
Topic: ClF4+ Lewis Structure
Replies: 2
Views: 51

### Re: ClF4+ Lewis Structure

I think F only forms only single bonds because of its electronegativity
Sat Dec 07, 2019 9:15 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH formula?
Replies: 21
Views: 399

### Re: pH formula?

it's -log[h+] and i doubt we would need to derive it
Sat Dec 07, 2019 6:40 pm
Forum: Naming
Topic: Latin Names
Replies: 3
Views: 25

### Latin Names

How do you know if an element's name originates from a Latin name like Fe(ferrum)
Mon Dec 02, 2019 9:29 am
Forum: Naming
Topic: hacks
Replies: 2
Views: 68

### Re: hacks

naming for what?
Mon Dec 02, 2019 8:59 am
Forum: Amphoteric Compounds
Topic: Identifying Amphoteric Compounds
Replies: 5
Views: 28

### Re: Identifying Amphoteric Compounds

Mon Dec 02, 2019 8:51 am
Forum: Administrative Questions and Class Announcements
Topic: Final tips
Replies: 19
Views: 149

### Re: Final tips

Probably go over your midterm, go over homework problems, and examples Lavelle emphasized in class.
Mon Dec 02, 2019 8:51 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Posts
Replies: 10
Views: 101

### Re: Chemistry Community Posts

I’m not sure, would like to know to lol
Mon Dec 02, 2019 8:48 am
Forum: Identifying Acidic & Basic Salts
Topic: Final: Strong/ Weak Acids/Bases
Replies: 11
Views: 724

### Re: Final: Strong/ Weak Acids/Bases

I think it would be helpful to know them
Mon Dec 02, 2019 8:47 am
Forum: Calculating the pH of Salt Solutions
Topic: pH formula?
Replies: 21
Views: 399

### Re: pH formula?

pH=-log[h+]
Mon Dec 02, 2019 8:47 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH calcuations
Replies: 8
Views: 44

### Re: pH calcuations

I think so, unless he gives us another one
Fri Nov 29, 2019 2:44 pm
Forum: SI Units, Unit Conversions
Topic: midterm/final
Replies: 18
Views: 246

### Re: midterm/final

probably like the midterm, mostly calculation with some conceptual problems.
Fri Nov 29, 2019 2:43 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength and Weakness
Replies: 12
Views: 326

### Re: Strength and Weakness

compare ka values
Fri Nov 29, 2019 2:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Value of pH
Replies: 8
Views: 41

### Re: Value of pH

yes it could go below negative. The way you calculate ph is -log[h+]
Fri Nov 29, 2019 2:32 pm
Forum: Lewis Acids & Bases
Topic: HCl vs HF
Replies: 19
Views: 98

### Re: HCl vs HF

HCL is a strong acid
Sun Nov 24, 2019 6:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7826
Views: 1085614

### Re: Post All Chemistry Jokes Here

What's Ba(Na2)?

a banana.
Sun Nov 24, 2019 4:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7826
Views: 1085614

### Re: Post All Chemistry Jokes Here

What weapon can you make from the elements potassium, nickel and iron? A KNiFe.
Thu Nov 21, 2019 9:27 am
Forum: Hybridization
Topic: Quiz 2 Hybridization Question
Replies: 4
Views: 42

### Re: Quiz 2 Hybridization Question

no hybridization was not on the test
Thu Nov 21, 2019 9:24 am
Forum: Hybridization
Topic: for test 2
Replies: 7
Views: 54

### Re: for test 2

i dont think so
Thu Nov 21, 2019 9:23 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: types of bonds
Replies: 14
Views: 267

### Re: types of bonds

A single bond has 1 sigma bond, double has a sigma and a pi, and triple has a sigma and 2 pi
Sat Nov 16, 2019 8:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 8
Views: 45

### Re: Bond Angles

I think you find it out experimentally. The way you know for a test is just memorizing
Wed Nov 13, 2019 5:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear VSEPR model
Replies: 21
Views: 126

### Re: Linear VSEPR model

Lone pairs on the central atom adds a domain onto the central atom so it would not be linear. For example if you had H2O, the electron geometry would be tetrahedral because of 2 O-H bonds and 2 lone pairs.
Wed Nov 13, 2019 5:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR model angles
Replies: 7
Views: 39

### Re: VSEPR model angles

I think so
Wed Nov 13, 2019 5:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorizing and Recognizing Molecular Shapes
Replies: 4
Views: 26

### Re: Memorizing and Recognizing Molecular Shapes

I would assume so. We went over them in class in detail so I believe they will be tested
Sun Nov 03, 2019 7:14 pm
Forum: Trends in The Periodic Table
Topic: Effective Nuclear Charge and Nuclear Charge
Replies: 6
Views: 47

### Re: Effective Nuclear Charge and Nuclear Charge

outer electrons experience a shielding effect from the inner electrons so it's less than the nuclear charge.
Sun Nov 03, 2019 7:12 pm
Forum: Bond Lengths & Energies
Topic: Bonding
Replies: 7
Views: 62

### Re: Bonding

Anything in period 3 or larger can have a expanded shell because electrons can fill the D orbital
Sun Nov 03, 2019 7:08 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 5
Views: 25

### Re: Resonance structures

yes, basically. There can be a lot of possible ways to draw an molecule but the best drawing is the one with the lowest formal charge.
Sun Nov 03, 2019 7:07 pm
Forum: Lewis Structures
Topic: lowest energy
Replies: 5
Views: 29

### Re: lowest energy

I think it just means the one that is the most stable (lowest formal charges on the atoms)
Sun Nov 03, 2019 7:05 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent
Replies: 5
Views: 22

### Re: Ionic and Covalent

Ionic bonds are when electrons from on atom are transferred over to the other. Covalent bonds are equal sharing of electrons.
Sun Oct 27, 2019 8:32 pm
Forum: Ionic & Covalent Bonds
Topic: Putting valence electrons on N than H
Replies: 2
Views: 26

### Re: Putting valence electrons on N than H

hydrogen has a max shell of 2. A bond is already two ions so the rest of the electrons have to rest on the nitrogen
Sun Oct 27, 2019 8:31 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 5
Views: 40

### Re: Resonance

resonance structures are similar molecules with bonds in different places basically.
Sun Oct 27, 2019 8:30 pm
Forum: Resonance Structures
Topic: delocalized electrons
Replies: 3
Views: 22

### Re: delocalized electrons

it makes it hard to draw so we don't represent them. Delocalization of electrons are not bound to just one atom but they are freely floating so the actual molecule is a sort of average of all the resonance structures Heres an article that helps explain it.https://chem.libretexts.org/Bookshelves/Phys...
Sun Oct 27, 2019 8:26 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 12
Views: 64

### Re: Lone Pairs

a lone pair is 2 dots next to an atom
Sun Oct 27, 2019 8:26 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 5
Views: 29

### Re: Drawing Lewis Structures

You first add up the number of valence electrons for each of the atoms. Then, you try to make sure you try to make it so each atom has 8 valence electrons with the exception of H(only can share 1 bond), and a elements that have period 3 or higher.
Sun Oct 20, 2019 7:09 pm
Forum: DeBroglie Equation
Topic: EM Radiation and DeBroglie Equation
Replies: 3
Views: 21

### Re: EM Radiation and DeBroglie Equation

i don't think theres a consensus about that, it's a weird property of light to have momentum but not mass. Heres an article that I read online: http://www.desy.de/user/projects/Physic ... _mass.html
Sun Oct 20, 2019 7:08 pm
Forum: SI Units, Unit Conversions
Topic: midterm/final
Replies: 18
Views: 246

### Re: midterm/final

I feel like it would be mostly calculations. But, you can check past midterms in his class. i think theres a test bank somewhere.
Sun Oct 20, 2019 7:05 pm
Forum: Photoelectric Effect
Topic: Video module Test
Replies: 3
Views: 46

### Re: Video module Test

to find the longest wavelength first you would have to find the frequency of the wave. You get that through E=hv. where v= E/h. Then you would plug v into the equation c=(wavelength)(v) and then solve for wavelength.
Sun Oct 20, 2019 7:02 pm
Forum: Einstein Equation
Topic: Equation use
Replies: 6
Views: 45

### Re: Equation use

you would just have to see what you're looking for and what you're given. I think the best way to learn is through practice.
Sun Oct 20, 2019 6:56 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 384

### Re: Best Way To Study?

I look over lecture notes + read through the textbook and do practice problems.
Sat Oct 19, 2019 5:46 pm
Forum: Einstein Equation
Topic: Focus 1B.5 Homework.. Electron Volts
Replies: 2
Views: 24

### Re: Focus 1B.5 Homework.. Electron Volts

it's just another way of representing energy. the conversion between eV and Joules is: 1 eV = 1.6× 10^-19 J
Sat Oct 19, 2019 5:40 pm
Forum: Properties of Light
Topic: Difference between photon vs particle
Replies: 5
Views: 43

### Re: Difference between photon vs particle

I think it's because photons are a type of particle with the unique property that they are both a particle with wavelike properties
Fri Oct 11, 2019 4:11 pm
Forum: Properties of Light
Topic: Energy Levels
Replies: 8
Views: 103

### Re: Energy Levels

UV radiation has the highest energy. Anything that deals with n=1 is in the UV region because it takes the most amount of energy to go from it.
Fri Oct 11, 2019 4:03 pm
Forum: Significant Figures
Topic: for test 1
Replies: 3
Views: 85

### Re: for test 1

you will probably get points off for not having correct sig figs
Fri Oct 11, 2019 3:52 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 20
Views: 211

### Re: Balancing Chemical Reactions

Not really. Sometimes you just gotta grind it out. If you dont already, you can try to balance polyatomic ions if they show up on both sides instead of breaking them up into individual elements.
Fri Oct 11, 2019 2:42 pm
Forum: Properties of Light
Topic: Amplitude
Replies: 12
Views: 101

### Re: Amplitude

Fri Oct 11, 2019 2:40 pm
Forum: Balancing Chemical Reactions
Topic: HW Problem H7
Replies: 4
Views: 95

### Re: HW Problem H7

Hydroxide= (OH) with a -1 charge. Ca has a +2 so you would need 2 hydroxides

It's always good to remember some of the common polyatomic ions (phosphate, sulfate, sulfide, nitrate, nitride, etc) but he did not say anything about memorizing them yet.
Fri Oct 11, 2019 2:37 pm
Forum: Significant Figures
Replies: 8
Views: 84

### Re: Sig Figs in Answer

I would probably do 3 but that might not be right.
Wed Oct 02, 2019 12:45 pm
Forum: Empirical & Molecular Formulas
Topic: Homework problem E1
Replies: 9
Views: 91

### Re: Homework problem E1

Since you want to find the length of the atoms in 1 mol of a element, you would mutiple the given radius by 2 to get the diameter and then mutiple it by the total number of atoms (6.02 x 10^23).
Wed Oct 02, 2019 12:42 pm
Forum: Molarity, Solutions, Dilutions
Topic: G5 Solution?
Replies: 5
Views: 52

### Re: G5 Solution?

I think you're doing the same thing. When you convert divide by 250ml by the moles, you are finding the molarity. My equations seem to be the same as you.
Wed Oct 02, 2019 9:14 am
Forum: Balancing Chemical Reactions
Topic: Chem Test Balancing Equations [ENDORSED]
Replies: 4
Views: 343

### Re: Chem Test Balancing Equations[ENDORSED]

In order to start this problem, you have to correctly balance out the equation first. Then, convert grams into moles and convert to one of the products and whichever produces less product is the limiting reactant.
Wed Oct 02, 2019 9:11 am
Forum: Significant Figures
Topic: Lecture on Sig Figs?
Replies: 4
Views: 52

### Re: Lecture on Sig Figs?

it might be better to review it on your own so that even if we review it in class you understand it better.
Mon Sep 30, 2019 11:26 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations
Replies: 7
Views: 82

### Re: Balancing equations

Most of the time, I think you should have whole numbers in your balanced equations and not decimals.