Search found 85 matches

by Michelle Xie 3A
Thu Feb 27, 2020 4:17 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation Energy
Replies: 12
Views: 307

Re: Activation Energy

Activation energy is the energy needed to a reaction to occur.
by Michelle Xie 3A
Thu Feb 20, 2020 10:34 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 8
Views: 32

Re: oxidation numbers

You use the known oxidation numbers for some elements and fill in the rest. The sum of all the oxidation numbers should add up to the total charge of the molecule.
by Michelle Xie 3A
Thu Feb 20, 2020 10:34 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions
Replies: 5
Views: 21

Re: Balancing Redox Reactions

I don't think it matters where the molecules are placed as long as they are balanced correctly and on the correct side.
by Michelle Xie 3A
Thu Feb 20, 2020 10:33 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 4
Views: 16

Re: oxidation numbers

A decrease in number means a decrease in charge, which signifies reduction because it gains an electron and goes down in charge. vice versa for increase
by Michelle Xie 3A
Thu Feb 20, 2020 10:32 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 5
Views: 27

Re: Oxidation Numbers

There's some rules to follow, such as oxygen is almost always 2-, fluorine is almost always 1-, etc. The oxidation numbers of all the elements should add up to the charge.
by Michelle Xie 3A
Thu Feb 20, 2020 10:30 pm
Forum: Balancing Redox Reactions
Topic: Oxidation numbers
Replies: 6
Views: 28

Re: Oxidation numbers

H2 is an exception because it is a diatomic and in its most stable form.
by Michelle Xie 3A
Tue Feb 11, 2020 3:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for delta H
Replies: 3
Views: 14

Re: Units for delta H

delta H is in kj/mol. if it was just kj, it would be q or just energy.
by Michelle Xie 3A
Tue Feb 11, 2020 3:00 pm
Forum: Calculating Work of Expansion
Topic: Constant Volume and Pressure Values
Replies: 8
Views: 34

Re: Constant Volume and Pressure Values

I think we just need to know the monoatomic ones.
by Michelle Xie 3A
Tue Feb 11, 2020 2:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: adiabatic
Replies: 18
Views: 70

Re: adiabatic

adiabatic means where there is no transfer of heat, so q is zero.
by Michelle Xie 3A
Tue Feb 11, 2020 2:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal energy of ideal gas
Replies: 4
Views: 22

Re: Internal energy of ideal gas

only delta U, or change in internal energy is 0.
by Michelle Xie 3A
Tue Feb 11, 2020 2:58 pm
Forum: Calculating Work of Expansion
Topic: calculating work of a reversible reaction
Replies: 5
Views: 29

Re: calculating work of a reversible reaction

If the system is doing work, or expanding, work would be negative. If it had work being done on it, or being compressed, it would be positive.
by Michelle Xie 3A
Tue Feb 11, 2020 2:57 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Thermodynamics
Replies: 6
Views: 38

Re: Thermodynamics

both would be negative since the system is losing energy.
by Michelle Xie 3A
Tue Jan 28, 2020 4:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: reaction enthalpy
Replies: 14
Views: 53

Re: reaction enthalpy

Energy is released when bonds form, therefore making it exothermic and the enthalpy would be negative since the final molecule has less energy than the separate atoms.
by Michelle Xie 3A
Tue Jan 28, 2020 4:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Best Method of the 3 Given?
Replies: 7
Views: 29

Re: Best Method of the 3 Given?

I think method one is the most accurate since the enthalpies are given as exact for each reaction.
by Michelle Xie 3A
Tue Jan 28, 2020 4:55 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 11
Views: 45

Re: Hess's Law

You add enthalpies together, reverse signs for reverse reactions, and multiply if you multiply the whole reaction.
by Michelle Xie 3A
Tue Jan 28, 2020 4:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 11
Views: 40

Re: Bond Enthalpies

The bond enthalpies are averages of all the possible ones, so it is less accurate.
by Michelle Xie 3A
Tue Jan 28, 2020 4:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Adding Enthalpies
Replies: 5
Views: 20

Re: Adding Enthalpies

You add the enthalpies and reverse signs when the reaction is reversed.
by Michelle Xie 3A
Thu Jan 23, 2020 4:21 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Endothermic Reaction.
Replies: 7
Views: 36

Re: Endothermic Reaction.

If delta H is positive, it means the reaction is endothermic .
by Michelle Xie 3A
Thu Jan 23, 2020 4:18 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Endothermic Reaction.
Replies: 7
Views: 36

Re: Endothermic Reaction.

If delta H is positive, it means the reaction is endothermic .
by Michelle Xie 3A
Thu Jan 23, 2020 4:17 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa to Kb
Replies: 12
Views: 52

Re: pKa to Kb

pKa + pKb is pKw, which is 14.
by Michelle Xie 3A
Thu Jan 23, 2020 4:16 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: exothermic reactions
Replies: 19
Views: 79

Re: exothermic reactions

In an exothermic reaction, the heat is written as a product. Increasing a product would push the reaction to the left and favor the reactants.
by Michelle Xie 3A
Thu Jan 23, 2020 4:15 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 19
Views: 88

Re: Le Chatelier's Principle

You use the principle when the reaction is no longer at equilibrium.
by Michelle Xie 3A
Thu Jan 23, 2020 4:14 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in pressure
Replies: 5
Views: 31

Re: Changes in pressure

Adding inert gases will not change concentration of anything and will just be present among both sides of the molecules. The inert gas does not react with anything.
by Michelle Xie 3A
Sat Jan 18, 2020 5:52 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction shifts right or left?
Replies: 14
Views: 73

Re: Reaction shifts right or left?

A left shift favors reactants and a right shift favors products.
by Michelle Xie 3A
Sat Jan 18, 2020 5:49 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Partial Pressure
Replies: 19
Views: 61

Re: Partial Pressure

Usually, it will be given.
by Michelle Xie 3A
Sat Jan 18, 2020 5:47 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q < K
Replies: 16
Views: 53

Re: Q < K

When Q is less than K, more products tend to form.
by Michelle Xie 3A
Sat Jan 18, 2020 5:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Eq. constants & solubility
Replies: 3
Views: 34

Re: Eq. constants & solubility

The greater the ksp, the greater the solubility.
by Michelle Xie 3A
Sat Jan 18, 2020 5:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc sig figs
Replies: 4
Views: 21

Re: Kc sig figs

Take the least amount of sig figs.
by Michelle Xie 3A
Tue Jan 07, 2020 4:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Writing expression for K
Replies: 5
Views: 59

Re: Writing expression for K

Px is used for gases to represent their partial pressure. In other cases, you would use concentration.
by Michelle Xie 3A
Tue Jan 07, 2020 4:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium and Equilibrium Constant
Replies: 4
Views: 32

Re: Equilibrium and Equilibrium Constant

Changing the equilibrium means you take the reaction out of the equilibrium by removing or adding reactant/product. Changing the constant would mean you have to change pressure and temperature.
by Michelle Xie 3A
Tue Jan 07, 2020 4:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Very Large K
Replies: 12
Views: 76

Re: Very Large K

A large K would mean the product concentration in the equation is much greater than the reactant. Therefore, the reaction at equilibrium favors the products.
by Michelle Xie 3A
Tue Jan 07, 2020 4:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant for Solids/Gases
Replies: 5
Views: 36

Re: Equilibrium Constant for Solids/Gases

Solids and liquids are not included in the equation.
by Michelle Xie 3A
Tue Jan 07, 2020 4:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc versus K
Replies: 4
Views: 34

Re: Kc versus K

K can be represented with both Kp and Kc.
by Michelle Xie 3A
Fri Dec 06, 2019 1:12 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 19
Views: 125

Re: sigma and pi bonds

Yes, sigma bonds are single bonds. Pi bonds are any bonds on top of the first one.
by Michelle Xie 3A
Fri Dec 06, 2019 1:07 pm
Forum: Ionic & Covalent Bonds
Topic: intermolecular vs intramolecular
Replies: 7
Views: 60

Re: intermolecular vs intramolecular

Intermolecular is between molecules while intramolecular is within a molecule.
by Michelle Xie 3A
Mon Dec 02, 2019 10:02 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: increasing pH and decreasing pH
Replies: 4
Views: 35

Re: increasing pH and decreasing pH

Yes the higher the hydronium ion concentration, the lower the pH and the more acidic.
by Michelle Xie 3A
Mon Dec 02, 2019 10:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Hydronium concentration = 1.5M, negative ph?
Replies: 3
Views: 34

Re: Hydronium concentration = 1.5M, negative ph?

I think we can assume it is zero since the pH scale is between 0 and 14.
by Michelle Xie 3A
Mon Dec 02, 2019 5:16 pm
Forum: Conjugate Acids & Bases
Topic: Product of Acid and Base
Replies: 5
Views: 47

Re: Product of Acid and Base

The proton combines with the hydroxide ion to make water and the two other ions made a salt.
by Michelle Xie 3A
Mon Dec 02, 2019 4:46 pm
Forum: Conjugate Acids & Bases
Topic: How many gets transferred?
Replies: 1
Views: 25

Re: How many gets transferred?

One proton gets transferred at a time.
by Michelle Xie 3A
Mon Dec 02, 2019 4:45 pm
Forum: Conjugate Acids & Bases
Topic: Identifying conjugate acids & bases
Replies: 3
Views: 25

Re: Identifying conjugate acids & bases

Water acts as the base. It can do this because it is an amphoteric molecule. I also think you meant the hydronium ion instead of the hydroxide ion.
by Michelle Xie 3A
Tue Nov 26, 2019 6:23 pm
Forum: Lewis Acids & Bases
Topic: Lewis and Bronsted
Replies: 5
Views: 36

Re: Lewis and Bronsted

The lewis definition involves the transfer of a pair of electrons. The bronsted definition involves transfer of a proton.
by Michelle Xie 3A
Tue Nov 26, 2019 6:21 pm
Forum: Amphoteric Compounds
Topic: How can compounds be amphoteric?
Replies: 5
Views: 35

Re: How can compounds be amphoteric?

Amphoteric compounds can both donate and accept a proton.
by Michelle Xie 3A
Tue Nov 26, 2019 6:20 pm
Forum: Bronsted Acids & Bases
Topic: Definition
Replies: 5
Views: 48

Re: Definition

A bronsted acid is one that can give up a proton. A lewis acid is one that can accept a pair of electrons.
by Michelle Xie 3A
Tue Nov 26, 2019 6:20 pm
Forum: Bronsted Acids & Bases
Topic: Difference
Replies: 3
Views: 21

Re: Difference

Bronsted acids involving the donating and accepting of a proton while lewis acids involve donating and accepting of a pair of electrons.
by Michelle Xie 3A
Thu Nov 21, 2019 3:26 pm
Forum: Biological Examples
Topic: Ligands
Replies: 7
Views: 313

Re: Ligands

There is usually one d metal atom.
by Michelle Xie 3A
Thu Nov 21, 2019 3:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: cisplatin
Replies: 4
Views: 43

Re: cisplatin

Cisplatin can bind to DNA molecules and prevent cells from dividing. It is used as a treatment for cancer.
by Michelle Xie 3A
Thu Nov 21, 2019 3:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate bonds
Replies: 3
Views: 38

Re: Coordinate bonds

Coordinate covalent bonds form when the ligand donates both electrons in the electron pair.
by Michelle Xie 3A
Thu Nov 21, 2019 11:03 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Covalent Bonds
Replies: 4
Views: 30

Re: Coordination Covalent Bonds

In a coordinate covalent bond, the nonmetal has a lone pair and donates both electrons to the bond.
by Michelle Xie 3A
Thu Nov 21, 2019 11:03 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 2
Views: 21

Re: Coordination Number

It's the number of bonds on the central atom.
by Michelle Xie 3A
Thu Nov 21, 2019 11:02 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 4
Views: 45

Re: Ligands

Ligands are not the central atom. They bond to the central atom.
by Michelle Xie 3A
Thu Nov 14, 2019 7:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electrons
Replies: 9
Views: 69

Re: Electrons

Electrons naturally repel each other so having a greater distance between them would lower these repulsion forces.
by Michelle Xie 3A
Thu Nov 14, 2019 7:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Model of H2O
Replies: 12
Views: 90

Re: VESPR Model of H2O

H2O is bent because of the two lone pairs on the oxygen.
by Michelle Xie 3A
Thu Nov 14, 2019 7:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Pyramid vs Trigonal Planar
Replies: 6
Views: 38

Re: Trigonal Pyramid vs Trigonal Planar

Trigonal planar is in one plane and has three areas of e density while trigonal pyramidal is 3d and has 4 areas.
by Michelle Xie 3A
Thu Nov 14, 2019 7:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 135

Re: Molecular Shape Name

I think we will need to know most of the names.
by Michelle Xie 3A
Thu Nov 14, 2019 6:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Molecular Structures
Replies: 8
Views: 45

Re: Drawing Molecular Structures

The solid triangle represents the atom coming out of the page towards you. The dashed lines represent the atom going away from you into the page. Lines are used to draw atoms that are on the same plane as the paper. The other two symbols are when the atoms come out of the plane.
by Michelle Xie 3A
Fri Nov 08, 2019 12:57 am
Forum: Octet Exceptions
Topic: General principles of octet exception
Replies: 7
Views: 43

Re: General principles of octet exception

Atoms with n=3 and greater can accommodate more than 8 electrons in its valence shell.
by Michelle Xie 3A
Fri Nov 08, 2019 12:56 am
Forum: Octet Exceptions
Topic: Lewis Acids and Bases?
Replies: 11
Views: 84

Re: Lewis Acids and Bases?

A lewis base would donate a pair of electrons and a lewis acid would accept a pair of electrons.
by Michelle Xie 3A
Fri Nov 08, 2019 12:55 am
Forum: Octet Exceptions
Topic: elements in 3p block
Replies: 8
Views: 105

Re: elements in 3p block

They are able to use their 3d orbital. They are just normally not filled.
by Michelle Xie 3A
Fri Nov 08, 2019 12:54 am
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 4
Views: 34

Re: Lewis Structure

The most stable would be the one in which the most atoms have the lowest formal charges.
by Michelle Xie 3A
Tue Nov 05, 2019 10:34 am
Forum: Coordinate Covalent Bonds
Topic: Single, double, and triple bonds
Replies: 6
Views: 48

Re: Single, double, and triple bonds

It depends on the atom radii. If the atoms are larger, the bond is weaker because the pull of the nucleus weaker due to how far apart they are from the electrons.
by Michelle Xie 3A
Sat Nov 02, 2019 5:30 pm
Forum: Bond Lengths & Energies
Topic: Single bond vs double bond
Replies: 14
Views: 134

Re: Single bond vs double bond

The numbers are the bond length between the carbon atoms.
by Michelle Xie 3A
Sat Nov 02, 2019 5:27 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 3
Views: 26

Re: Octet Exceptions

The element needs to have a d orbital, so only those from n=3 and greater.
by Michelle Xie 3A
Sat Nov 02, 2019 5:22 pm
Forum: Coordinate Covalent Bonds
Topic: Electronegativity
Replies: 12
Views: 414

Re: Electronegativity

As you go down a period, there is more and more shielding, making the nuclear charge weaker. Therefore, it is harder to pull an electron in, decreasing the electronegativity.
by Michelle Xie 3A
Sat Nov 02, 2019 5:19 pm
Forum: Lewis Structures
Topic: central atom
Replies: 16
Views: 155

Re: central atom

Use the element with the lowest electronegativity.
by Michelle Xie 3A
Sat Nov 02, 2019 5:02 pm
Forum: Sigma & Pi Bonds
Topic: Double bond
Replies: 15
Views: 119

Re: Double bond

Double bonds are used to satisfy the octet rule, which lowers the energy of the molecule, making it more stable.
by Michelle Xie 3A
Sat Nov 02, 2019 5:00 pm
Forum: Resonance Structures
Topic: Resonance structure
Replies: 4
Views: 36

Re: Resonance structure

NH4 does not have resonance but some molecules that do are the nitrate and carbonate ions.
by Michelle Xie 3A
Mon Oct 28, 2019 10:56 am
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds confusion
Replies: 7
Views: 54

Re: Ionic Bonds confusion

It is with a metal and nonmetal since a metal tends to give electrons away to the nonmetal.
by Michelle Xie 3A
Mon Oct 28, 2019 10:56 am
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 104

Re: Covalent Bonds

Covalent bonds are just between two nonmetals.
by Michelle Xie 3A
Mon Oct 28, 2019 10:55 am
Forum: Ionic & Covalent Bonds
Topic: Ground State
Replies: 11
Views: 73

Re: Ground State

The ground state is when the atom is at the lowest possible energy. It corresponds to the electron configuration.
by Michelle Xie 3A
Sun Oct 20, 2019 11:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Hund's Rule
Replies: 5
Views: 53

Re: Hund's Rule

There are electron repulsions with paired electrons, therefore it is not favorable to have paired electrons before parallel ones.
by Michelle Xie 3A
Sun Oct 20, 2019 11:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Excited State
Replies: 3
Views: 35

Re: Excited State

If an electron isn't following one of the rules, it is in an excited state. Atoms fill their orbitals with electrons starting from the lowest energy levels and with parallel spin. If an electron skips one of these levels, it is in an excited state.
by Michelle Xie 3A
Sun Oct 20, 2019 11:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Multi-electron atoms
Replies: 7
Views: 36

Re: Multi-electron atoms

Some ions have only one electron, such as He 1+ or Li 2+.
by Michelle Xie 3A
Wed Oct 16, 2019 11:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers question, ml
Replies: 2
Views: 45

Re: Quantum Numbers question, ml

ml can only range from -l to +l. So for example, if l=2, ml can be -2, -1, 0, 1, or 2. Therefore if l=0, ml can only be 0.
by Michelle Xie 3A
Thu Oct 10, 2019 3:59 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Photon Absorption/Emission
Replies: 8
Views: 116

Re: Photon Absorption/Emission

The photon will be emitted again once the electron falls back down from the excited level. The photon has to have the exact amount of energy needed in order for the electron to absorb it and move to a higher energy level.
by Michelle Xie 3A
Thu Oct 10, 2019 3:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Decreasing gap between energy level
Replies: 6
Views: 75

Re: Decreasing gap between energy level

As the electrons get farther from the nucleus, the pull of the nucleus becomes weaker. Therefore, it takes less energy to remove that electron from that level.
by Michelle Xie 3A
Thu Oct 10, 2019 3:11 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 2323

Re: E=hv

It represents the energy of a photon, but can be used to find energy needed.
by Michelle Xie 3A
Thu Oct 10, 2019 10:32 am
Forum: Properties of Light
Topic: Light intensity
Replies: 6
Views: 67

Re: Light intensity

The higher intensity in terms of wave properties would just mean a larger amplitude.
by Michelle Xie 3A
Thu Oct 10, 2019 12:05 am
Forum: Properties of Light
Topic: Speed of Light constant
Replies: 7
Views: 39

Re: Speed of Light constant

I usually just use 3.00 unless theres like another value with a crazy amount of sig figs. It should be fine since Prof. Lavelle also used it.
by Michelle Xie 3A
Tue Oct 01, 2019 4:37 pm
Forum: Significant Figures
Topic: Sig Figs for Tests/Quizzes
Replies: 7
Views: 86

Re: Sig Figs for Tests/Quizzes

Points probably won't be taken off for the correct number of sigfigs. I save all my decimals till the very end and then round where I need to so I'm not off by a few decimals.
by Michelle Xie 3A
Tue Oct 01, 2019 4:34 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 529

Re: Balancing Equations [ENDORSED]

You would probably lose points. Also even though the equation is balanced without whole numbers, it doesn't make sense for there to be half of a molecule. It would not only make more sense but also make solving problems later on easier with whole number coefficients.
by Michelle Xie 3A
Tue Oct 01, 2019 4:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution
Replies: 9
Views: 158

Re: Dilution

The amount of solute doesn't change, only the solvent. So when you are calculating dilutions, you only need to account for the added solvent since you already know the amount of solute already.
by Michelle Xie 3A
Tue Oct 01, 2019 11:56 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: What does dilution mean in a chemistry problem?
Replies: 8
Views: 302

Re: What does dilution mean in a chemistry problem?

Dilution is when you add more solvent, decreasing the concentration of the overall solution since the amount of solute remains the same.
by Michelle Xie 3A
Tue Oct 01, 2019 10:33 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 4
Views: 65

Re: Avogadro's Number

I used 6.022 x 10^23 in all the problems and I've gotten the right answer so I would say use that, especially if Dr. Lavelle uses it too.

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