Search found 56 matches

by sarahartzell1A
Sun Mar 01, 2020 8:57 pm
Forum: General Science Questions
Topic: Studying
Replies: 19
Views: 113

Re: Studying

practice problems
by sarahartzell1A
Sun Mar 01, 2020 8:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell potential
Replies: 15
Views: 53

Re: cell potential

if Ecell is positive, delta G will be negative meaning the reaction is spontaneous
by sarahartzell1A
Sun Mar 01, 2020 8:50 pm
Forum: Balancing Redox Reactions
Topic: 6L.9
Replies: 3
Views: 58

Re: 6L.9

Yeah I think you're right
by sarahartzell1A
Sun Feb 16, 2020 8:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 12
Views: 86

Re: K

Exclude pure solids and liquids!
by sarahartzell1A
Sun Feb 16, 2020 8:21 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta s = 0
Replies: 8
Views: 107

Re: Delta s = 0

In a reversible isothermal reaction
by sarahartzell1A
Sun Feb 16, 2020 8:19 pm
Forum: Van't Hoff Equation
Topic: delta s
Replies: 9
Views: 51

Re: delta s

Because delta s won't change in those conditions!
by sarahartzell1A
Sun Feb 16, 2020 8:18 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 13
Views: 57

Re: Spontaneous

When delta G is negative!
by sarahartzell1A
Sun Feb 16, 2020 8:17 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 8
Views: 84

Re: Phase changes

Usually when the boiling, melting, or freezing point has been reached.
by sarahartzell1A
Sun Feb 02, 2020 7:47 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Value of q
Replies: 11
Views: 86

Re: Value of q

q of the system would be equal to q of the surroundings I believe
by sarahartzell1A
Sun Feb 02, 2020 7:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1 #6
Replies: 6
Views: 51

Re: Test 1 #6

HF is a weak acid!
by sarahartzell1A
Sun Feb 02, 2020 7:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Moles
Replies: 8
Views: 55

Re: Moles

Just the coefficients for gaseous molecules!
by sarahartzell1A
Sun Feb 02, 2020 7:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 6
Views: 33

Re: Bond Enthalpies

Energy is released when the bonds are formed, so it is negative as it is exothermic.
by sarahartzell1A
Sun Jan 26, 2020 11:53 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta s
Replies: 5
Views: 27

Re: delta s

Delta s is entropy which is change in disorder, while delta h is enthalpy.
by sarahartzell1A
Sun Jan 26, 2020 11:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Pure solids & liquids
Replies: 5
Views: 35

Re: Pure solids & liquids

Pure solids and liquids are in their pure form and not dissolved in any other liquid.
by sarahartzell1A
Sun Jan 26, 2020 11:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp to Kc
Replies: 11
Views: 47

Re: Kp to Kc

Yes, unless it is a pure solid or gas.
by sarahartzell1A
Sun Jan 26, 2020 11:49 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 12
Views: 89

Re: H2O as a Gas

If it is a gas or aqueous you include it, but if not you do not.
by sarahartzell1A
Sun Jan 26, 2020 11:48 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating K
Replies: 15
Views: 120

Re: Calculating K

The equation should be balanced.
by sarahartzell1A
Sun Jan 12, 2020 11:09 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 6
Views: 41

K is the equilibrium constant while Q is the reaction quotient.
by sarahartzell1A
Sun Jan 12, 2020 11:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentrations and the K value.
Replies: 7
Views: 47

Re: Concentrations and the K value.

Maybe because it represents the molar ratio of the substances.
by sarahartzell1A
Sun Jan 12, 2020 11:06 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating Q
Replies: 16
Views: 77

Re: Calculating Q

You include the aqueous solutions.
by sarahartzell1A
Sun Jan 12, 2020 11:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homogenous Equilibrium
Replies: 13
Views: 59

Re: Homogenous Equilibrium

All the products/reactants have to be in the same phase for it to be considered homogeneous.
by sarahartzell1A
Sun Jan 12, 2020 11:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 9
Views: 46

Re: Calculating K

Water is not accounted for because it is a pure liquid!
by sarahartzell1A
Thu Dec 06, 2018 11:11 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: H30+ and H+
Replies: 4
Views: 126

Re: H30+ and H+

H+ does not usually exist as a single proton and binds with water.
by sarahartzell1A
Thu Dec 06, 2018 11:10 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 814

Re: Work Function

Use the equation EK = h v - workfunction to solve.
by sarahartzell1A
Thu Dec 06, 2018 11:09 pm
Forum: Bronsted Acids & Bases
Topic: Glucose as an acid
Replies: 3
Views: 127

Re: Glucose as an acid

I do not think it is either, as well.
by sarahartzell1A
Fri Nov 30, 2018 7:32 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 5
Views: 189

Re: Polarizability

When it is highly polarizable, this means its electron cloud has a higher chance of being distorted, usually because of the size of the anion.
by sarahartzell1A
Fri Nov 30, 2018 7:31 am
Forum: Hybridization
Topic: hybridization notation
Replies: 3
Views: 117

Re: hybridization notation

The 2 refers to the energy level of the orbital.
by sarahartzell1A
Fri Nov 30, 2018 7:29 am
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angle
Replies: 6
Views: 184

Re: bond angle

Since you cannot know the exact angle, <120 is acceptable.
by sarahartzell1A
Fri Nov 30, 2018 7:29 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 3
Views: 150

Re: Lone pairs

Lone pairs have a larger volume of space whereas the electrons on the atoms are more restricted by the bonds so the repulsion is less.
by sarahartzell1A
Fri Nov 30, 2018 7:28 am
Forum: Sigma & Pi Bonds
Topic: Sigma bonds
Replies: 6
Views: 241

Re: Sigma bonds

Sigma bonds overlap on top of each other.
by sarahartzell1A
Fri Nov 30, 2018 7:27 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: test #3
Replies: 14
Views: 641

Re: test #3

You should know the bond angles. Also, it helps to follow the outlines he posted as to what is on the test.
by sarahartzell1A
Thu Nov 15, 2018 4:52 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 10
Views: 637

Re: Formal Charge

It is important to pay attention to the formal charge as not all elements adhere to the octet rule.
by sarahartzell1A
Thu Nov 15, 2018 4:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Double Bonds in VSEPR
Replies: 5
Views: 128

Re: Double Bonds in VSEPR

The double bond will still be considered one area of electron density so there is no difference in the model.
by sarahartzell1A
Thu Nov 15, 2018 4:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Planar vs Pyramidal
Replies: 3
Views: 181

Re: Planar vs Pyramidal

Even if the atoms are different, it will still be planar.
by sarahartzell1A
Thu Nov 08, 2018 10:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 2
Views: 303

Re: VSEPR

Look at bonding electrons and lone pairs of electrons around the central atom. Sulfur has four bonds and one lone pairs of electrons, so the formula is AX4E which corresponds to the see-saw shape
by sarahartzell1A
Thu Nov 08, 2018 10:06 pm
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 817

Re: Octet vs formal charge

It is important to make sure the formal charge is as accurate as possible but always be aware of the octet rule and its exceptions
by sarahartzell1A
Mon Nov 05, 2018 12:56 pm
Forum: DeBroglie Equation
Topic: work function and frequency
Replies: 4
Views: 372

work function and frequency

How do you calculate the frequency of an incident light when given the wavelength and work function (for example: if the wavelength of the ejected electron is 1.1 nm, what was the frequency of the incident light? The work function of sodium is 150.6 kj mol-1)
by sarahartzell1A
Fri Nov 02, 2018 8:45 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent Bonds
Replies: 18
Views: 731

Re: Ionic vs Covalent Bonds

Ionic bonds involve the transfer of electrons while in covalent bonds the electron is shared
by sarahartzell1A
Fri Nov 02, 2018 8:43 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Degenerate orbitals
Replies: 3
Views: 130

Re: Degenerate orbitals

Degenerate orbitals are orbitals that have the same energy level
by sarahartzell1A
Fri Nov 02, 2018 8:39 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Is electron removed from 3d or 4s first?
Replies: 5
Views: 9947

Re: Is electron removed from 3d or 4s first?

The electron will be removed from 4s first since 3d has slightly higher energy.
by sarahartzell1A
Thu Oct 25, 2018 6:46 pm
Forum: Properties of Electrons
Topic: mass of electron
Replies: 5
Views: 251

Re: mass of electron

It might be faster when doing calculations to memorize the value, however, most constants and equations can be found on a reference sheet during an exam.
by sarahartzell1A
Thu Oct 25, 2018 6:44 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty of an Electron's Velocity & Speed of Light
Replies: 4
Views: 238

Re: Uncertainty of an Electron's Velocity & Speed of Light

Nothing can go faster than the speed of light, so since the model shows the velocity of the electron as being faster, it was disproved.
by sarahartzell1A
Thu Oct 25, 2018 6:27 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 3177

Re: E=hv

E represents the energy of the photon but you can also use this equation to find the energy needed to remove the electron, just remember to pay attention to kinetic energy.
by sarahartzell1A
Thu Oct 18, 2018 6:00 pm
Forum: Photoelectric Effect
Topic: Speed of Light
Replies: 5
Views: 165

Re: Speed of Light

Nothing can travel faster than the speed of light.
by sarahartzell1A
Thu Oct 18, 2018 5:56 pm
Forum: DeBroglie Equation
Topic: units
Replies: 3
Views: 150

units

When using DeBroglie's equation do you have to calculate given values into certain units before putting them into the equation?
by sarahartzell1A
Thu Oct 18, 2018 5:55 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 2
Views: 95

orbitals

How do you find the number of orbitals in a sub shell when given the value of l?
by sarahartzell1A
Fri Oct 12, 2018 8:24 am
Forum: SI Units, Unit Conversions
Topic: Units
Replies: 8
Views: 286

Re: Units

I am not sure about points but it is a good idea to write the units in your work just in case and so you know what the correct units should be at the end for your answer
by sarahartzell1A
Fri Oct 12, 2018 8:22 am
Forum: Significant Figures
Topic: sig figs urgent question!
Replies: 12
Views: 765

Re: sig figs urgent question!

There are 4 significant figures because the zeros are in between 1s which are sig figs.
by sarahartzell1A
Fri Oct 12, 2018 8:21 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reagent
Replies: 10
Views: 709

Re: Limiting Reagent

personally, I would use the amount of each reagant to calculate the amount of moles you have then use the molar ratio to determine how many moles of each substance you need to find the limiting reactant that way.
by sarahartzell1A
Thu Oct 04, 2018 6:29 pm
Forum: Molarity, Solutions, Dilutions
Topic: aqueous solutions
Replies: 1
Views: 70

aqueous solutions

How do we explain how to prepare an aqueous solution when given the amount we need to prepare and a percent composition of a compound (such as in question G.7 in the sixth edition)?
by sarahartzell1A
Thu Oct 04, 2018 6:25 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 220

Molecular Formula

How do you write the molecular formula for a compound when given the diagram of the molecular structure? (such as in question F.1 in the sixth edition for example)
by sarahartzell1A
Thu Oct 04, 2018 6:04 pm
Forum: Empirical & Molecular Formulas
Topic: Homework Problem F.3 (part a)
Replies: 2
Views: 100

Re: Homework Problem F.3 (part a)

There are some common rules you can memorize to help you find the formulas for acids and other compounds. For example, if an acid ends in "ic," it comes from an anion that ended in "ate," in this case nitrate (NO3-). Since the anion has a 1- charge, one hydrogen is needed to bala...

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