- Unimolecular reaction: only 1 reactant molecule participates, molecularity =1
- Bimolecular reaction: two reactant species come together to react, molecularity=2
- Termolecular reaction: the collision of 3 molecules & uncommon
Search found 64 matches
- Fri Mar 15, 2019 3:36 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Types of Molecularity
- Replies: 4
- Views: 2262
- Fri Mar 15, 2019 3:34 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Molecularity
- Replies: 3
- Views: 761
Re: Molecularity
You can determine molecularity by looking at the number of molecules/ions/atoms that are participating in the rate determining step of a reaction.
- Fri Mar 15, 2019 3:30 pm
- Forum: *Enzyme Kinetics
- Topic: How do you tell if something is a catalyst vs an intermediate?
- Replies: 16
- Views: 6013
Re: How do you tell if something is a catalyst vs an intermediate?
When you are looking at the elementary reactions, catalysts are in the very first step as a reactant and as a product in the very last step too. Catalysts create a different, faster pathway for the reaction, but it is not used. Intermediates are not present as reactants in the first step but are pro...
- Fri Mar 15, 2019 3:17 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst and Activation Energy
- Replies: 2
- Views: 355
Re: Catalyst and Activation Energy
The catalyst provides a completely different pathway, which speeds up the reaction; it does not speed up the original pathway. You usually base the rate law on the slowest, rate determining step. But when a catalyst is introduced, you can base it upon the new, different pathway the catalyst provides...
- Fri Mar 15, 2019 3:08 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: DeltaS Total
- Replies: 2
- Views: 570
Re: DeltaS Total
deltaStot = deltaSsys + deltaSsurr
When a reaction is at equilibrium & is reversible.
Then, deltaSsurr=-deltaSsys
When a reaction is at equilibrium & is reversible.
Then, deltaSsurr=-deltaSsys
- Fri Mar 15, 2019 3:05 pm
- Forum: Balancing Redox Reactions
- Topic: Balanced Half Reactions
- Replies: 5
- Views: 696
Re: Balanced Half Reactions
First, focus on balancing the reactants and products of each half reaction. Next, to get the overall reaction, add the two half-reactions together. At this step, you would multiply a factor to a half reaction if needed so that electrons/spectators are canceled as needed for the overall rxn.
- Fri Mar 15, 2019 3:01 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: strong and weak acids
- Replies: 5
- Views: 765
Re: strong and weak acids
A weak acid has less % dissociation (less of the acid, or the [HA] is breaking down), so that means when you take the pH, the value will be higher.
- Fri Mar 15, 2019 2:58 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Purpose of Arrhenius equation
- Replies: 2
- Views: 280
Re: Purpose of Arrhenius equation
If we are asked to find the frequency factor, A, it tells us how often molecules collide when the concentration is [1] and whether or not the molecules are properly oriented.
- Fri Mar 15, 2019 2:54 pm
- Forum: General Rate Laws
- Topic: k'
- Replies: 3
- Views: 344
Re: k'
Like the others said k' is the rate constant for the reverse reaction. In addition to applying it to the K=k/k', you can also see k' in elementary reaction rates that are used to find net rate of formation.
- Mon Mar 11, 2019 7:20 pm
- Forum: Experimental Details
- Topic: Dimerization
- Replies: 2
- Views: 797
Re: Dimerization
I think dimerization is referring to an addition reaction where two molecules of the same compound react. For example, molecule A + molecule A reacts to form molecule A2.
- Mon Mar 11, 2019 7:16 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation number?
- Replies: 12
- Views: 7571
Re: Oxidation number?
This list really helped me determined oxidation numbers!
- Mon Feb 25, 2019 2:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge vs porous disk
- Replies: 2
- Views: 266
Re: salt bridge vs porous disk
Both the salt bridge and the porous disk have the same purpose in a cell. They facilitate ion transfer, which stops charge buildup within the cell. I don't think we have to know when/why either is used for this class; it will be either be stated in the problem or it won't be significant.
- Mon Feb 25, 2019 2:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic vs Voltaic
- Replies: 1
- Views: 194
Re: Galvanic vs Voltaic
They are the same; there are just two names for it. Both are names for an electrochemical cell in which a spontaneous redox reaction is induced to create electrical charge flow.
- Mon Feb 25, 2019 2:34 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: F in Nernst Equation
- Replies: 2
- Views: 254
Re: F in Nernst Equation
Yes, F is the Faraday constant. The Faraday constant represents the # of colombs per mole of elections. I think it is given to us on the equation sheet!
- Sun Feb 17, 2019 2:41 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Entropy using statefunctions
- Replies: 2
- Views: 529
Re: Entropy using statefunctions
Because entropy is a state function, it doesn't matter what "path" you take, as long as you correctly get from point A to point B. Therefore, you calculate the change in volume, then you can calculate the change in temperature (or vice versa, it doesn't what order you do it in). Then you a...
- Sun Feb 17, 2019 2:38 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Monatomic VS Diatomic Gases and their C
- Replies: 3
- Views: 644
Re: Monatomic VS Diatomic Gases and their C
They are different because their C value is different depending on the structure of the molecule you're looking at and whether or not the system is at constant pressure or constant volume. Cv,m=3/2R for a monatomic molecule Cv,m= 5/2R for a diatomic or linear molecule Cp,m=5/2R for a monatomic molec...
- Sun Feb 17, 2019 2:35 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: calculating delta S
- Replies: 4
- Views: 488
Re: calculating delta S
Using the ideal gas law, or Boyle's law, where PV=nRT, P and V are inversely proportional which is why V2/V1=P1/P2.
- Thu Feb 07, 2019 12:15 am
- Forum: Calculating Work of Expansion
- Topic: Different Work Equations
- Replies: 2
- Views: 278
Re: Different Work Equations
Le learned this in discussion today and these are from my notes!
- For a reversible, isothermal expansion of an ideal gas:
w=-nRTln(Vfinal/Vinitial) OR w=-nRTln(Pinitial/Pfinal)
- For constant pressure:
w=-PdeltaV=-deltanRT
- For constant volume:
w=0
- For a reversible, isothermal expansion of an ideal gas:
w=-nRTln(Vfinal/Vinitial) OR w=-nRTln(Pinitial/Pfinal)
- For constant pressure:
w=-PdeltaV=-deltanRT
- For constant volume:
w=0
- Wed Feb 06, 2019 11:52 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: 'C' constant
- Replies: 2
- Views: 213
Re: 'C' constant
The constant C in (ΔS = nC ln (T2/T1)) stands for the heat capacity at constant volume or constant pressure, depending on the problem.
- Wed Feb 06, 2019 11:36 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Degeneracy
- Replies: 2
- Views: 235
Re: Degeneracy
Degeneracy refers to the multiple ways that energy can be configured. Entropy refers to the "uncertainty" or "disorder" of a system. They have a proportional relationship; as degeneracy increases, entropy increases too, vice versa.
- Wed Feb 06, 2019 11:31 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Negative q
- Replies: 7
- Views: 2784
Re: Negative q
Heat (q) is negative when the amount of heat is being released/reaction is exothermic. The equation for entropy includes delta q, or the change in q; this is how q and entropy are related.
- Wed Feb 06, 2019 11:27 pm
- Forum: Calculating Work of Expansion
- Topic: 6th edition 8.31
- Replies: 3
- Views: 375
Re: 6th edition 8.31
Here's the worked out problem!
- Wed Feb 06, 2019 10:20 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temp affecting K
- Replies: 4
- Views: 556
Re: Temp affecting K
Temperature is the only thing that affects the equilibrium constant (K). Therefore, when temperature changes, so does K. Q is used to calculate the current state or a hypothetical state of a reaction to compare to the K for the temperature to see whether the reaction will favor reactants or products.
- Wed Feb 06, 2019 10:17 pm
- Forum: Student Social/Study Group
- Topic: Unit Conversion for Temp
- Replies: 2
- Views: 305
Re: Unit Conversion for Temp
We don't have to always convert to K for every calculation in chemistry, but most of the equations we use right now have units that use K in them. The best course of action is to look at the units used in the equation/problem and adjust accordingly.
- Tue Feb 05, 2019 3:03 pm
- Forum: Calculating Work of Expansion
- Topic: Reversible and Irreversible Reactions
- Replies: 2
- Views: 262
Re: Reversible and Irreversible Reactions
More work is down in a reversible expansion because they move very slowly and work against external pressure. Think about the equations; the equation for reversible expansion uses an integral for accuracy because the expansion is slower and does more work whereas the equation for irreversible equati...
- Tue Feb 05, 2019 2:44 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Microstate
- Replies: 7
- Views: 822
Re: Microstate
Microstates are specific ways in which the energy of a system can be arranged. The multiple ways the energy can be arranged depends on the atom/molecule arrangements. Entropy is the measure of uncertainty in a system, so the more microstates there are, the higher the entropy.
- Tue Feb 05, 2019 12:32 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy
- Replies: 2
- Views: 278
Re: Entropy
DeltaU describes the change in internal energy of a system and DeltaH describes the change in total heat content of the system. Entropy is the measure of uncertainty, which is very significant in describing a system.
- Mon Feb 04, 2019 2:05 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Thermos
- Replies: 4
- Views: 550
Re: Thermos
A thermos is technically an isolated system because there is no exchange of matter or energy between the system (thermos) and surroundings. However, a cold or hot drink in the thermos will eventually get to room temperature. It's very difficult to achieve and build a true, isolated system, but the t...
- Sun Feb 03, 2019 11:44 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heating Curve
- Replies: 4
- Views: 420
Re: Heating Curve
Steam hurts a lot more than just hot water because of the energy difference. Looking at the heating curve, steam (water in gas form) lies higher than hot water (water in liquid form; although it is hot water and "holds" more energy, it is still a liquid). When the steam hits your hand, the...
- Sun Feb 03, 2019 11:39 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: intensive vs extensive properties
- Replies: 2
- Views: 310
Re: intensive vs extensive properties
Extensive properties depend on the quantity of material being measured. An example of an extensive property is mass. The higher the quantity of the material, the higher the mass will be. On the other hand, intensive properties don't depend on the quantity of material being measured. For example, an ...
- Sun Feb 03, 2019 11:36 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Hess's Law depends on enthalpy as a state function
- Replies: 3
- Views: 1075
Re: Hess's Law depends on enthalpy as a state function
Hess's Law states that the heat of a specific reaction is equal to the sum of the heats of reaction. This depends on the fact that enthalpy is a state function because state function values do not depend on the path that is taken to reach that specific value. Therefore, it is okay to add/subtract th...
- Sun Feb 03, 2019 11:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated systems
- Replies: 2
- Views: 280
Re: Isolated systems
Isolated systems are important because there is no energy or matter transfer between the system and its surroundings. An open system allows both energy and matter to transfer between the system and its surroundings & a closed system allows energy to be transferred between the system and its surr...
- Thu Dec 06, 2018 2:49 pm
- Forum: Ionic & Covalent Bonds
- Topic: Net dipole
- Replies: 2
- Views: 1350
Re: Net dipole
ClF3 is T-Shaped, and so the dipole movement between the Cl and F atoms do not evenly cancel each other out. This means the ClF3 molecule is polar. However, the BF3 molecule is trigonal planar, so the dipole movement between the B and F atoms cancel each other out. The dipole movement points to the ...
- Thu Dec 06, 2018 2:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing trigonal planar
- Replies: 4
- Views: 914
Re: Drawing trigonal planar
You don't have to draw wedges/lined triangles in a trigonal planar shape. The wedges and such indicate that the bond is 3D (either "coming out" of the paper or "going into" the paper), but all four atoms in a trigonal planar molecule lay flat.
- Thu Dec 06, 2018 2:43 pm
- Forum: Student Social/Study Group
- Topic: Dec 5 Notes
- Replies: 2
- Views: 551
Re: Dec 5 Notes
Here!
- Thu Dec 06, 2018 2:31 pm
- Forum: Conjugate Acids & Bases
- Topic: Inverse Proportional
- Replies: 2
- Views: 308
Re: Inverse Proportional
Yes, the relationship between the strength of an acid/base and the strength of its conjugate base/acid is inversely proportional. The stronger the base is, the stronger its conjugate acid & vice versa.
- Thu Dec 06, 2018 2:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E
- Replies: 18
- Views: 3293
Re: AX3E
First, add together the number of bonds in the molecule (the number following X). In this case, it is 3. Then add the number of lone pairs (the number following E). In this case, it is 1. 3 + 1 = 4. Therefore, we know that the shape is tetrahedral, but since there is a lone pair, the geometry is tri...
- Thu Dec 06, 2018 2:20 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Water
- Replies: 2
- Views: 390
Re: Water
When we increase the temperature, water's ability to ionize increases, so [H+] increases, which means pH decreases. Essentially, a record of a pH value without a corresponding temperature value is not enough information in something like a lab report. If it is just water by itself, I don't think tem...
- Thu Dec 06, 2018 2:10 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Neutral salt
- Replies: 3
- Views: 511
Re: Neutral salt
Looking at salt as the product of an acid-base reaction, we can determine how the salt would act. For example, a popular neutral salt is table salt, or NaCl. We know the Na+ ion comes from NaOH. NaOH is a strong base, dissociating fully. Once dissociated, Na+ does not want to turn back into NaOH. We...
- Thu Dec 06, 2018 2:01 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Ka equation
- Replies: 2
- Views: 438
Re: Ka equation
Water is left out of the equation because it doesn't change in concentration. These equations are determining the strength of an acid/base, so the constant H2O concentration does not play a role.
- Thu Dec 06, 2018 1:50 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating pH
- Replies: 2
- Views: 325
Re: Calculating pH
For example, we are given that the molarity of a solution is 0.1M NaOH. Since we know that NaOH is a strong base, we know that it will fully dissociate. Therefore,
0.1 M NaOH --> 0.1 M OH-
pH = 14 - pOH = 14 - (-log([OH-])) = 14 - (-log([0.1M)) = 14 - 1 = 13
So, the final answer is pH = 13.
0.1 M NaOH --> 0.1 M OH-
pH = 14 - pOH = 14 - (-log([OH-])) = 14 - (-log([0.1M)) = 14 - 1 = 13
So, the final answer is pH = 13.
- Thu Dec 06, 2018 1:44 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: PKa and Pkb vs Ka and Kb
- Replies: 4
- Views: 1929
Re: PKa and Pkb vs Ka and Kb
They aren't exactly the same, but they are related. The PKa/PKb is used to measure the strength of an acid or base in solution whereas pH is specifically the measure of the concentration of hydrogen ions in solution.
- Thu Dec 06, 2018 1:41 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acid/Base
- Replies: 3
- Views: 431
Re: Conjugate Acid/Base
In an acid-base reaction, the conjugate acid/base are on the products side of the equation. Essentially, the conjugate acid is the base with a hydrogen ion added to it. The conjugate base what is remaining after the original acid has donated a proton during the acid-base reaction.
- Sat Nov 17, 2018 9:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity
- Replies: 3
- Views: 392
Re: Polarity
Polar compounds are often nonsymmetrical as well. The lack of symmetry is what causes dipole moments. Nonpolar molecules do not have dipole moments because either the bonded atoms do not have a great enough electronegativity difference or the molecule is symmetrical and the dipole moments cancel.
- Sat Nov 17, 2018 9:00 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: Lewis Structures before Forces
- Replies: 3
- Views: 290
Re: Lewis Structures before Forces
I agree with the others who have responded. I feel that it is always best to start out with a Lewis structure and then go from there. You can determine the shape/structure and then observe how the intermolecular forces affect molecule interaction.
- Sat Nov 17, 2018 8:48 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: Energy of Intermolecular Forces
- Replies: 6
- Views: 939
Re: Energy of Intermolecular Forces
It seems a little bit counterintuitive, but forming bonds requires energy. Creating a bond is bringing 2+ atoms into a more stable position. Thus, breaking the bond is where energy is absorbed whereas forming bonds is where energy is released.
- Sat Nov 17, 2018 8:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.17d
- Replies: 2
- Views: 476
Re: 4.17d
Determining when the bond angle is a "little less" or "slightly less" greatly depends on the existence of lone pairs and how it creates repulsion against one another and thus, against the other atoms within the molecules. I like to try to imagine the molecule and picture how cert...
- Sat Nov 17, 2018 8:36 pm
- Forum: Bond Lengths & Energies
- Topic: 6th edition 3.87
- Replies: 2
- Views: 338
Re: 6th edition 3.87
Essentially, the question is asking the following: Of CF4, CCl4, and CBr4, which is the strongest bond? The strongest bond would be the shortest bond; the pull between the two atoms is the strongest. Therefore, the strongest C-X bond would be predicted to be CF4.
- Sat Nov 17, 2018 8:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 16
- Views: 1233
Re: Bond Angles
It isn't necessary to memorize exact bond angles for specific molecules. Dr. Lavelle mentioned that we just need to know how lone pairs affect repulsion and nearby bond angles (i.e. a lone pair will push against adjacent bond angles, making them less than the standard degree for that specific shape).
- Sun Nov 04, 2018 6:11 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 4
- Views: 446
Re: Electronegativity
Electronegativity is how efficient an atom can attract electrons and electron affinity is the energy released when an electron is added in the gaseous state to form an anion. Electronegativity increases and electron affinity gets more negative from left to right, and from bottom to top.
- Sun Nov 04, 2018 5:40 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 4
- Views: 437
Re: Atomic Radius
An easy way to memorize how the atomic radius trends are to consider how electrons and protons are attracted to each other.
- Sun Nov 04, 2018 5:36 pm
- Forum: Ionic & Covalent Bonds
- Topic: Naming Ionic Compounds
- Replies: 5
- Views: 497
Re: Naming Ionic Compounds
I don't think Dr. Lavelle said anything specific about naming ionic compounds, but an easy way to remember is to name the cation first and then name the anion second, changing the suffix of the nonmetal to "-ide."
- Mon Oct 29, 2018 3:04 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Balmer series, Lyman series?
- Replies: 3
- Views: 425
Re: Balmer series, Lyman series?
The Balmer and Lyman series are just named for series with a specific final resting energy quanta level (n). Lyman's final resting spot is n=1 whereas Balmer ends at n=2.
- Mon Oct 29, 2018 2:42 am
- Forum: Ionic & Covalent Bonds
- Topic: Roman numerals next to element
- Replies: 8
- Views: 6160
Re: Roman numerals next to element
The use of Roman numerals in chemical nomenclature is to indicate the charge of the ion. Usually, the transitional metal has multiple possible ion charges. For example, Fe (II) stands for Fe2+ and Fe (III) stands for Fe3+; the charge changes according to the number of electrons on the atom.
- Mon Oct 29, 2018 2:39 am
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 13
- Views: 1039
Re: Lewis Structures
The center atom is most likely the one with the lowest ionization/electronization energy.
- Mon Oct 22, 2018 8:48 pm
- Forum: Lewis Structures
- Topic: determining shapes of molecules
- Replies: 2
- Views: 201
Re: determining shapes of molecules
When determining the shape of a molecule, I like to draw a basic Lewis dot structure model and then use the VSEPR (Valence Shell Electron Pair Repulsion) theory, which states that the repulsion of the valence electron pairs is what gives the molecules their shape.
- Mon Oct 22, 2018 8:44 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Pauli Exclusion Principle
- Replies: 3
- Views: 445
Re: Pauli Exclusion Principle
Essentially the Pauli exclusion principle doesn't allow the electrons to have the same exact quantum numbers. So to occupy the same orbital, the spin has to be different.
- Mon Oct 22, 2018 8:27 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Two exceptions
- Replies: 2
- Views: 182
Re: Two exceptions
There are two exceptions because a completely full/half full d sub-level is more stable than when partially filled, so an electron from the 4 oribital is excited and moves to a 3d orbital. They are more stable configurations. And I agree, I think we should memorize these exceptions.
- Sun Oct 14, 2018 2:54 pm
- Forum: Significant Figures
- Topic: When to round the answers to significant figures
- Replies: 11
- Views: 2688
Re: When to round the answers to significant figures
I usually try to keep as many sig figs as I can during the calculations so that the final answer is more accurate. Then, I do all the rounding and cut down to the appropriate number of sig figs at the final step.
- Fri Oct 12, 2018 6:38 pm
- Forum: DeBroglie Equation
- Topic: "Wave-like Properties" of Matter
- Replies: 6
- Views: 279
Re: "Wave-like Properties" of Matter
I think Dr. Lavelle mentioned this in lecture! From what I remember, he said there is no specific wavelength where a moving object is considered to have "measurable wave-like properties." I don't think we will have to worry about this on any tests/quizzes though, it's just something to kee...
- Fri Oct 12, 2018 6:23 pm
- Forum: Properties of Light
- Topic: 6th Edition Ch.1 #57
- Replies: 1
- Views: 206
6th Edition Ch.1 #57
Can someone explain how to do Ch.1 6th edition 57?
- Thu Oct 04, 2018 5:31 pm
- Forum: Empirical & Molecular Formulas
- Topic: HW 1 Problem F.9
- Replies: 7
- Views: 472
Re: HW 1 Problem F.9
Yes, they are asking for the empirical formula.
- Thu Oct 04, 2018 5:25 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework: E1, 6th Ed.
- Replies: 5
- Views: 554
Re: Homework: E1, 6th Ed.
It gives you the radius, but you need the diameter to get the length of the chain. So 2 x 144 pm = 288 pm. 1 mol of Ag means there are 6.022 x 10^23 atoms of Ag. Then you multiply (6.022 x 10^23 atoms of Ag)(288 pm)= 1.73 x 10^26 pm. Then, you convert to km, which is 1.73 x 10^11 km.
- Thu Oct 04, 2018 5:01 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 6
- Views: 521
Re: Sig Figs
Whenever there is a decimal, you count from left to right starting with the first nonzero number, which is why 400.0 and 400.00 have a different amount of sig figs.