Search found 77 matches

by ABombino_2J
Sun Feb 16, 2020 10:19 pm
Forum: Balancing Redox Reactions
Topic: easier to split?
Replies: 6
Views: 22

Re: easier to split?

The splitting of the redox reaction into two half reactions makes it easier to balance the reaction by adding electrons and therefore adding h+ to the opposite side.
by ABombino_2J
Tue Feb 11, 2020 4:22 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: State of matter affect entropy
Replies: 3
Views: 7

Re: State of matter affect entropy

Typically entropy will increase as heat is added and vice-versa because deltaS= delta q/T
by ABombino_2J
Tue Feb 11, 2020 4:18 pm
Forum: Ideal Gases
Topic: reversing reactions
Replies: 9
Views: 27

Re: reversing reactions

K reverse : 1/k
K*n : K^n
K*m: K^(1/m)
by ABombino_2J
Tue Feb 11, 2020 4:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure equilibrium problems
Replies: 2
Views: 11

Re: Partial Pressure equilibrium problems

Many times you will need to use PV=nRt to find the partial pressures of all the gases, then use an ICE table just like you would with contractions and a Kp value.
by ABombino_2J
Tue Feb 11, 2020 4:09 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Inert Gas
Replies: 2
Views: 11

Re: Adding Inert Gas

Adding an inert gas increases the pressure of the system but will not affect the equilibrium constant K or Q because these gases do not react easily because they have a full octet
by ABombino_2J
Tue Feb 11, 2020 4:03 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Pizza Rolls Question 5!! Help
Replies: 3
Views: 53

Re: Pizza Rolls Question 5!! Help

No it shouldn't matter because the volume is no longer changing. You can think of it as doing the volume change with constant temperature then the temperature change with the constant final volume.
by ABombino_2J
Sun Feb 02, 2020 10:04 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: accuracy of bond enthalpies
Replies: 8
Views: 23

Re: accuracy of bond enthalpies

The bond enthalpy method is the least accurate because all the bond enthalpy es are averages of many molecules.
by ABombino_2J
Sun Feb 02, 2020 9:54 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: boltzmann equation
Replies: 4
Views: 24

Re: boltzmann equation

Yes. I’m pretty sure W is number of states^number of particles.
by ABombino_2J
Sun Feb 02, 2020 9:41 pm
Forum: Phase Changes & Related Calculations
Topic: Relevance of Phase Changes
Replies: 9
Views: 31

Re: Relevance of Phase Changes

When calculating the enthalpy change you need to add the enthalpy as a result of change in temperature as well as the enthalpy that comes from a phase change.
by ABombino_2J
Sun Feb 02, 2020 9:36 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 7
Views: 23

Re: Enthalpy

q=enthalpy only when the pressure is constant because no other work is being done.
by ABombino_2J
Sun Feb 02, 2020 9:33 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess’ Law
Replies: 10
Views: 35

Re: Hess’ Law

Hess’ Law is essentially the definition of a state function for enthalpy.
by ABombino_2J
Sun Jan 26, 2020 11:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Base Concentration
Replies: 3
Views: 18

Re: Acid and Base Concentration

If you had the concentration of an acid or base you would need to find the [H3O+] or [OH-] then find the PH of the acid. If the PH or POH are very very low they are most likely strong acids/bases.
by ABombino_2J
Sun Jan 26, 2020 11:23 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw Equations
Replies: 9
Views: 29

Re: Kw Equations

ka*kb=kw=10^-14
pka+pka=pkw=14 (you get this by taking the -log of the first equation)
Also, these equations are on the equation sheet just replace [H3O+] with ka, [OH-] with kb, pH with pka, and POH with pkb.
by ABombino_2J
Sun Jan 26, 2020 11:17 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka and Kb
Replies: 10
Views: 27

Re: Ka and Kb

All acids/bases have a Ka or a Kb but strong acids and bases have such large Ka and Kb's that they are considered to fully dissociate.
by ABombino_2J
Sun Jan 26, 2020 11:11 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Shifts Left or Right
Replies: 15
Views: 42

Re: Reaction Shifts Left or Right

Whenever you see heat added or released from a system, you can treat it just like the concentrations of products and reactants using Le Chatelier's.
by ABombino_2J
Sun Jan 26, 2020 11:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE
Replies: 20
Views: 70

Re: ICE

You may also need to use an ICE table when asked for the PH. Indirectly they are asking for the [H3O+] concentration to find the PH.
by ABombino_2J
Sun Jan 26, 2020 11:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta s
Replies: 5
Views: 12

Re: delta s

No delta S is entropy which measures change in disorder of a system. Delta H is enthalpy which measures change of heat in a system.
by ABombino_2J
Sun Jan 26, 2020 11:01 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 8
Views: 31

Re: Phase changes

Phase changes take up a large amount of heat so although heat is being supplied, the temperature does not change until the threshold for the new phase is reached.
by ABombino_2J
Sun Jan 26, 2020 10:58 pm
Forum: Phase Changes & Related Calculations
Topic: Hess's Law
Replies: 8
Views: 23

Re: Hess's Law

Hess' Law essential proves that enthalpy is a state function because you are allowed to add enthalpies without any regard for how the value was obtained.
by ABombino_2J
Sun Jan 26, 2020 10:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percent Ionization
Replies: 12
Views: 40

Re: Percent Ionization

Percent ionization is the x, or [H3O+] concentration divided, by by the initial acid concentration.
by ABombino_2J
Sun Jan 26, 2020 10:56 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of Vaporization and Fusion
Replies: 5
Views: 9

Re: Enthalpy of Vaporization and Fusion

The energy required to turn a liquid into a gas is a lot more than the energy that is required to turn a solid into a liquid.
by ABombino_2J
Fri Jan 10, 2020 11:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure's Effect on Equilibrium
Replies: 6
Views: 58

Re: Pressure's Effect on Equilibrium

When an inert gas is added, the concentrations of the products and the reactions are the same because there are the same moles present in the same volume container; therefore, K does not change.
by ABombino_2J
Fri Jan 10, 2020 11:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table Ratios
Replies: 7
Views: 36

Re: ICE Table Ratios

The ratio does not matter, but using whole number coefficients goes along better with the balanced equation.
by ABombino_2J
Fri Jan 10, 2020 10:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Meaning of equilibrium constant
Replies: 5
Views: 44

Re: Meaning of equilibrium constant

When 10^-3<K<10^3, neither the products nor the reactants are significantly favored. However, if K< 1, the reactants are slightly favored and the reaction lies to the left. Also, if K> 1, the products are slightly favored and the reaction lies to the right.
by ABombino_2J
Fri Jan 10, 2020 10:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: K vs Q
Replies: 9
Views: 51

Re: K vs Q

When Q is less than K there are more reactants because a larger denominator in [products]/[reactants] will lead to a smaller value Q. Therefore, this reaction will shift to the right to regain equilibrium. When Q is greater than K there are more products because a larger numerator in [products]/[rea...
by ABombino_2J
Fri Jan 10, 2020 10:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: predicting effects
Replies: 8
Views: 24

Re: predicting effects

Removing SO3 will lead to increase in not only NO but also SO3 because when the products are removed the reactants are favored, which means the reaction must shift to the left to once again reach equilibrium to accommodate for the higher concentration of the reactants.
by ABombino_2J
Mon Dec 09, 2019 3:50 am
Forum: Bronsted Acids & Bases
Topic: Strong Acids and Bases
Replies: 6
Views: 51

Re: Strong Acids and Bases

Strong acids are HCl, Her, HI, H2SO4, HClO3, HClO4, and HNo3.
The strong bases are group 1 and 2 oxides and hydroxides.
by ABombino_2J
Mon Dec 09, 2019 3:47 am
Forum: Quantum Numbers and The H-Atom
Topic: n, l ,ml, ms
Replies: 13
Views: 124

Re: n, l ,ml, ms

ms tells you if the electron is spin up or spin down. If it is the first time filling the orbital it is spin up. If you need to pair an electron it will be spin down.
by ABombino_2J
Mon Dec 09, 2019 3:45 am
Forum: DeBroglie Equation
Topic: converting from nm to m
Replies: 3
Views: 34

Re: converting from nm to m

You should convert nm to m so that the units cancel with the m in J.
by ABombino_2J
Mon Dec 09, 2019 3:44 am
Forum: Lewis Acids & Bases
Topic: Lewis acid
Replies: 3
Views: 37

Re: Lewis acid

NH4+ cannot accept anymore electrons because its octet is full.
by ABombino_2J
Mon Dec 09, 2019 3:42 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Stronger acid?
Replies: 9
Views: 80

Re: Stronger acid?

HClO2 is the stronger acid because it pulls electrons away from the H-C bonds making them easier to break which results in more H+ ions in solution.
by ABombino_2J
Mon Dec 09, 2019 3:41 am
Forum: Calculating the pH of Salt Solutions
Topic: OH- and H+
Replies: 6
Views: 64

Re: OH- and H+

If there is an acid in solution it will result in H+(H3O+) and if there is a base in solution it will result in OH-.
by ABombino_2J
Mon Dec 09, 2019 3:39 am
Forum: Calculating the pH of Salt Solutions
Topic: pH
Replies: 6
Views: 45

Re: pH

The higher the H3)+ concentration the lower the pH and the higher the pOH. The higher the OH- concentration the higher the pH and the lower the pOH.
by ABombino_2J
Mon Dec 09, 2019 3:36 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Shape
Replies: 29
Views: 186

Re: Bent Shape

A bent shape can have either 1 or 2 lone pairs.
by ABombino_2J
Mon Dec 09, 2019 3:33 am
Forum: Naming
Topic: "Ferrate"
Replies: 14
Views: 136

Re: "Ferrate"

In this case it would be ferrate because the coordination compound has a negative charge.
by ABombino_2J
Mon Dec 09, 2019 3:32 am
Forum: Biological Examples
Topic: Myoglobin
Replies: 3
Views: 53

Re: Myoglobin

Myoglobin has the biological capacity to transport 1 single Oxygen molecule.
by ABombino_2J
Wed Nov 27, 2019 12:14 am
Forum: Naming
Topic: Oxidation
Replies: 3
Views: 35

Re: Oxidation

To find the oxidation, take the charge of the one of the atoms you know for sure. O is always -2 and H is always +1. Essentially, take what you know and find the charges of the other atoms by adding or subtracting it to the charge of the molecule.
by ABombino_2J
Wed Nov 27, 2019 12:08 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How do you know is an acid is strong or weak?
Replies: 6
Views: 51

Re: How do you know is an acid is strong or weak?

The stronger the acid the more it will dissociate in water. The weaker the acid the less it will dissociate in water
by ABombino_2J
Wed Nov 27, 2019 12:02 am
Forum: Naming
Topic: Alphabetical Order
Replies: 6
Views: 41

Re: Alphabetical Order

Do all the ligands in alphabetical order not paying attention to the greek prefixes then put the central metal atom. All of these must be in the coordination sphere. Following the items within the coordination sphere, put the other ions and molecules.
by ABombino_2J
Tue Nov 26, 2019 11:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity and dipole moments
Replies: 8
Views: 46

Re: Polarity and dipole moments

A dipole cancels when a molecule has no lone pairs and the same attachments. It also will cancel when the net dipole moments cancel when they are facing the opposite directions. In addition, it is important to know that 2-3 linear geometry and square planar are non-polar when they have the same atta...
by ABombino_2J
Tue Nov 26, 2019 11:54 pm
Forum: Amphoteric Compounds
Topic: Amphoteric
Replies: 8
Views: 53

Re: Amphoteric

If you look at Be, Al, Ga, Sn, Pb, and Sb they form a rough diagonal line on the periodic table
by ABombino_2J
Sun Nov 24, 2019 9:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Numbers
Replies: 4
Views: 25

Re: Coordination Numbers

The coordination number is the amount of atoms or molecules attached directly to the central atom.
by ABombino_2J
Sun Nov 24, 2019 9:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Transition Metals
Replies: 7
Views: 45

Re: Transition Metals

Because the transition metals are all good Lewis acids, they can all form coordination compounds, but I'm pretty sure he said we only need to concern ourselves with the first row.
by ABombino_2J
Sun Nov 24, 2019 9:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Sphere
Replies: 5
Views: 35

Re: Coordination Sphere

The coordination sphere is the sphere around the molecules and ions attached to the transition metal atom. The ligands need to be in the sphere because ligands are the ions attached to the transition metals. Anything within the "[]" is inside the coordination sphere
by ABombino_2J
Sun Nov 24, 2019 9:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H3O+
Replies: 11
Views: 85

Re: H3O+

H3O+ is has an electron arrangement tetrahedral because there are 4 regions of electron density. However, the shape of H3O+ is trigonal planar because there are 3 bonds and 1 lone pair in H3O+. Be sure when looking at a molecule that you differentiate whether or not you are looking for shape or elec...
by ABombino_2J
Sun Nov 24, 2019 9:09 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 19
Views: 110

Re: sigma and pi bonds

Yes. All single bonds are sigma bonds. As you add an extra bond, you add a single pi bond to the sigma bond, so a double bond is sigma and pi and a triple bond is a sigma with 2 pis.
by ABombino_2J
Thu Nov 14, 2019 3:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Model of H2O
Replies: 12
Views: 83

Re: VESPR Model of H2O

H20 has a bent shape because it has 2 lone pairs and 2 single bonds. When trying to determine shape, count all the bonding regions and lone pairs. I assume we will learn about this in class on Friday.
by ABombino_2J
Thu Nov 14, 2019 3:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 122

Re: Molecular Shape Name

Yes, you should know the shape names as well as the bonding angles. These are easiest to memorize when you look at them in terms of total bonding regions as opposed to individually. You do not need to know how to draw the structure in 3d space, only the lewis structures; 3d will be reserved for orga...
by ABombino_2J
Thu Nov 14, 2019 3:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Methane VSEPR
Replies: 7
Views: 46

Re: Methane VSEPR

In 3-d Space when all the H atoms are equally spaced from C and when all the H atoms are as far apart as possible, the angle of the H-C-H bonds are approximately 109.5 degrees.
by ABombino_2J
Thu Nov 14, 2019 3:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electrons
Replies: 9
Views: 64

Re: Electrons

When electrons are close together, their negative charges repel each other which leads to a more unstable molecule. When the electrons are father apart, the electron electron repulsion is much less and in some cases 0.
by ABombino_2J
Thu Nov 14, 2019 3:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance VSEPR
Replies: 6
Views: 34

Re: Resonance VSEPR

When trying to determine shape, only pay attention to bonding regions, not the amount of bonds.
by ABombino_2J
Fri Nov 01, 2019 12:44 pm
Forum: Lewis Structures
Topic: Charges on Lewis Structures
Replies: 7
Views: 55

Re: Charges on Lewis Structures

For a molecule with a +1 charge such as ammonium, NH4+, you would subtract one e- from the valence e- so the total valence e- would 8. For a molecule with a -1 share like sulfate, SO4^2-, you would add 2 extra valence e-. The result is 32. To draw the lewis structure, just be sure to satisfy the amo...
by ABombino_2J
Fri Nov 01, 2019 12:35 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 10
Views: 54

Re: Lone Pairs

Lone pairs are pairs of electrons that are not shared with other elements. They are represented by dots around an element. To find the amount of lone pairs, count the number of dots and divide that number by 2.
by ABombino_2J
Fri Nov 01, 2019 12:29 pm
Forum: Bond Lengths & Energies
Topic: Single bond vs double bond
Replies: 14
Views: 122

Re: Single bond vs double bond

The double bonds are shorter than the single bonds because the extra e- creates more attractions between 2 elements. However, for benzene there are not true single or double bonds. Benzene actually has delocalized bonds, so rather than drawing a hexagon with alternating double bonds, the actually st...
by ABombino_2J
Fri Nov 01, 2019 12:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing electron configuration
Replies: 7
Views: 32

Re: Writing electron configuration

Yes, for Ca the electron configuration would en with 4s^2. For Ca^2+, the electron configuration would end with 3p^6.
by ABombino_2J
Fri Nov 01, 2019 12:12 pm
Forum: Bond Lengths & Energies
Topic: bond lengths
Replies: 10
Views: 76

Re: bond lengths

Bond dissociation is the energy required to break a chemical bond. For example, to break an H--H bond, the bond dissociation energy is 436D.
by ABombino_2J
Fri Nov 01, 2019 12:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing electron configuration
Replies: 7
Views: 32

Re: Writing electron configuration

Whenever you are writing an electron configuration the orbital with the lower n should come first.
by ABombino_2J
Sun Oct 27, 2019 7:32 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 5
Views: 33

Re: Lewis Structure

The 2 double bonds on the sulfate atom bring the formal charge of sulfate to 0. It is more important to have a lower formal charge on the central atom because it has a lower electron affinity.
by ABombino_2J
Sun Oct 27, 2019 7:30 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: p-orbitals
Replies: 11
Views: 41

Re: p-orbitals

The Px, Py, Pz should only be used when showing if the orbitals are full.
by ABombino_2J
Sun Oct 27, 2019 7:25 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 5
Views: 32

Re: Formal Charge

A single bond is counted as one electron although a single bond has a value of 2 electrons because 1 electron goes to one atom and the other electron goes to the other atom.
by ABombino_2J
Sun Oct 27, 2019 6:49 pm
Forum: Properties of Electrons
Topic: Electron removal
Replies: 11
Views: 82

Re: Electron removal

The electrons closer to the nucleus experience a stronger attraction and shield the outer electrons from receiving the same type of attraction.
by ABombino_2J
Sun Oct 27, 2019 6:37 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 16
Views: 110

Re: Valence Electrons

The valence electrons are electrons in the outer shell. If n=3, all of the electrons in that shell are the valance electrons.
by ABombino_2J
Sun Oct 20, 2019 9:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Pauli Exclusion Prinicple
Replies: 3
Views: 41

Re: Pauli Exclusion Prinicple

The Pauli Exclusion Principle essentially means that there cannot be more than 1 quantum number per election because, even if they share the same subshell, they will have different spin. If more than 2 electrons were to exist in an orbital they would have the same quantum numbers.
by ABombino_2J
Sun Oct 20, 2019 9:53 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configurations of ions
Replies: 4
Views: 22

Re: Electron configurations of ions

If the ion is positive, electrons must be taken away from the electron configuration because electrons have a negative charge. When the ion is negative, electrons must be added to the next available subshells.
by ABombino_2J
Sun Oct 20, 2019 9:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number
Replies: 4
Views: 32

Re: Quantum Number

You should not have to memorize anything since it can all be found on the periodic table.
by ABombino_2J
Sun Oct 20, 2019 9:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Ground State
Replies: 5
Views: 41

Re: Ground State

Ground state means that all the electrons are in the lowest possible energy levels. An excited state is when the electrons exist in a higher energy level.
by ABombino_2J
Sun Oct 20, 2019 9:41 pm
Forum: Properties of Electrons
Topic: Electron Configuration
Replies: 4
Views: 43

Re: Electron Configuration

The 3d orbital has less energy than the 4s orbital so it must come before because electron configurations are written in order based on amounts of energy.
by ABombino_2J
Sun Oct 13, 2019 5:53 pm
Forum: DeBroglie Equation
Topic: Wavelength
Replies: 6
Views: 55

Re: Wavelength

The smallest detectable wavelength is a gamma ray at 10^-14 meters. Professor Lavelle said anything smaller than 10^-15 meters is irrelevant and we should consider it to have an undetectable wavelength.
by ABombino_2J
Sun Oct 13, 2019 5:34 pm
Forum: SI Units, Unit Conversions
Topic: Unit conversion
Replies: 15
Views: 201

Re: Unit conversion

You need to use stoichiometry. (Unit A)(Unit B/Unit A). This will work for any unit so long as they are similar. For example: meters with millimeters or grams with kilograms.
by ABombino_2J
Sun Oct 13, 2019 5:21 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 17
Views: 215

Re: Combustion

Combustion, or burning, occurs whenever a hydrocarbon interacts with Oxygen. The products are Carbon dioxide and Water. The more oxygen present the more successful the combustion will be.
by ABombino_2J
Sun Oct 13, 2019 5:15 pm
Forum: Significant Figures
Topic: When to apply Sig Figs
Replies: 6
Views: 58

Re: When to apply Sig Figs

You should apply sig figs at the end of the calculation so that you do not get a rounding error for your final answer. It will be more accurate if you wait until the end.
by ABombino_2J
Sun Oct 13, 2019 5:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Configuration
Replies: 5
Views: 52

Re: Electron Configuration

You need to memorize it based on where the element shows up on the periodic table. The first S orbital begins with 1. The first P orbital starts with 2. The first D orbital starts with 3. The first F orbital starts with 4. For each row you go down on the periodic table these numbers increase by 1.
by ABombino_2J
Fri Oct 04, 2019 1:19 am
Forum: Limiting Reactant Calculations
Topic: Percent or theoretical yield
Replies: 14
Views: 149

Re: Percent or theoretical yield

The theoretical yield is calculated using stoichiometry to find the ideal mass of a product under ideal lab conditions. The percent yield shows how accurate the actual yield is in comparison to the theoretical yield. The percent yield is calculated using the following equation: percent yield= (actua...
by ABombino_2J
Fri Oct 04, 2019 1:03 am
Forum: SI Units, Unit Conversions
Topic: scientific notation
Replies: 7
Views: 52

Re: scientific notation

Scientific notation should be used to provide a more simplified view of an extreme number. .000006 is difficult to understand quickly so 6.0 x 10^-6 is used so that scientists can understand the number and it’s ramifications more easily.
by ABombino_2J
Fri Oct 04, 2019 12:37 am
Forum: Molarity, Solutions, Dilutions
Topic: Converting Before or After?
Replies: 10
Views: 63

Re: Converting Before or After?

You can have the final units in whichever unit makes the most sense. For example, you would not want a final mass to be 9.8 x 10^-2 kg because you could just say 98g unless it explicitly asks for kg. As you work the problem, you should use whichever units are easiest to use. Grams are usually easies...
by ABombino_2J
Sun Sep 29, 2019 4:02 pm
Forum: Significant Figures
Topic: Basic sig fig question
Replies: 6
Views: 214

Re: Basic sig fig question

I would recommend keeping the original numbers and numbers achieved from calculations without rounding until the final answer so that the final answer can be most accurate. The more rounding that is done throughout the process the less accurate the final answer will be.
by ABombino_2J
Sun Sep 29, 2019 3:31 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations
Replies: 7
Views: 82

Re: Balancing equations

You cannot have decimals in a balanced chemical reaction as your final result. If you do have any decimals, just multiply the entire equation by some number so that each stoichiometric coefficient is a whole number. The whole numbers are essential for providing a clear ratio between compounds/elemen...

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