Search found 51 matches

by Arvind 4G
Wed Dec 04, 2019 11:20 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 6
Views: 37

Re: Strong Acids

The ability to completely dissociate into solution and have two stable products in the solution.
by Arvind 4G
Wed Dec 04, 2019 11:19 pm
Forum: Lewis Acids & Bases
Topic: HF
Replies: 4
Views: 26

Re: HF

F- is not stable in solution and would react with the H+ ions in solution taking them out of solution.
by Arvind 4G
Wed Dec 04, 2019 11:18 pm
Forum: Lewis Acids & Bases
Topic: HCl and HI
Replies: 10
Views: 59

Re: HCl and HI

HI is stronger because the H-Cl bond is stronger than the H-I bond. A stronger acid needs to have weak bonds that are easily broken which allows H+ ions into solution.
by Arvind 4G
Wed Dec 04, 2019 11:16 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pOH Trends
Replies: 3
Views: 25

Re: pOH Trends

pOH is the opposite of pH. A high pOH indicates an acidic solution while a low pOH indicates a basic solution
by Arvind 4G
Wed Dec 04, 2019 11:12 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How does anion stability contribute to relative acidity?
Replies: 6
Views: 57

Re: How does anion stability contribute to relative acidity?

A more stable anion means that the anion is able to be by itself without reforming the compound it was a part of. Acid strength refers to its ability to form products, namely H+. If the H+ reacts with the anion because the anion isn't stable then the acid is not as strong.
by Arvind 4G
Sun Dec 01, 2019 8:54 pm
Forum: Hybridization
Topic: Applying Hybridization
Replies: 2
Views: 39

Re: Applying Hybridization

Hybridization is used in covalent bonds as the atoms do not have enough unpaired electrons in their valence shells and need to hybridize in order to bond.
by Arvind 4G
Sun Dec 01, 2019 8:51 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Base
Replies: 5
Views: 55

Re: Conjugate Base

Conjugate bases of strong acids are very weak so they do not have affect the pH of the solution
by Arvind 4G
Sun Dec 01, 2019 8:49 pm
Forum: Conjugate Acids & Bases
Topic: Water as an Acid/Base
Replies: 20
Views: 448

Re: Water as an Acid/Base

Water can be an acid or a base depending on what it is reacting with
by Arvind 4G
Sun Dec 01, 2019 8:47 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids Vs. Bases
Replies: 11
Views: 93

Re: Acids Vs. Bases

Acids donate protons and bases receive protons, and acids dissociate and increase the H+ concentration whereas bases dissociate and the increase the OH- concentration
by Arvind 4G
Sun Dec 01, 2019 8:46 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Pka vs Ka
Replies: 10
Views: 108

Re: Pka vs Ka

pKa is a way to represent ka and is easier on the eyes as it uses the logarithmic scale.
by Arvind 4G
Mon Nov 18, 2019 3:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: CH2Cl2 structure
Replies: 2
Views: 19

Re: CH2Cl2 structure

That will depend on the question. If it asks you to draw the molecule as polar then put the Cl's on the same side so that the dipoles do not cancel. Otherwise, put them on opposite sides so that the dipoles do cancel.
by Arvind 4G
Mon Nov 18, 2019 3:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 7
Views: 53

Re: VSEPR Notation

You do not need to write the E0 in that situation.
by Arvind 4G
Mon Nov 18, 2019 3:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 2
Views: 21

Re: Lone Pairs

Lone pairs push the bonded domains closer together and thus reduce the angle between those domains. The extent to which they are weakened differs from molecule to molecule.
by Arvind 4G
Mon Nov 18, 2019 3:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 44

Re: Shapes

We should know all of the geometries possible with up to 6 bonding domains and any combination of non bonding domains within those domains, i.e. 6 bonding domains of which one is a lone pair, etc..
by Arvind 4G
Mon Nov 18, 2019 3:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi Bond vs Sigma
Replies: 6
Views: 47

Re: Pi Bond vs Sigma

Sigma bonds are stronger than pi bonds because there is greater overlap between orbitals in sigma bonds.
by Arvind 4G
Thu Nov 14, 2019 11:35 am
Forum: Ionic & Covalent Bonds
Topic: Water molecules and ionic substances
Replies: 5
Views: 43

Re: Water molecules and ionic substances

They hydrogen bonding as well as the high polarity of water allows for the ionic substances to dissolve.
by Arvind 4G
Thu Nov 14, 2019 11:34 am
Forum: Ionic & Covalent Bonds
Topic: London Dispersion
Replies: 13
Views: 97

Re: London Dispersion

Every molecule has London dispersion forces which are created by momentary dipoles. Because they add up, larger molecules have stronger dispersion forces than smaller molecules.
by Arvind 4G
Thu Nov 14, 2019 11:33 am
Forum: Ionic & Covalent Bonds
Topic: covalent bonds
Replies: 7
Views: 67

Re: covalent bonds

3: polar covalent, nonpolar covalent, and coordinate covalent.
by Arvind 4G
Thu Nov 14, 2019 11:32 am
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 8
Views: 64

Re: Bond Strength

Ionic bonds are stronger because there is a greater charge difference between atoms and thus a higher attraction.
by Arvind 4G
Thu Nov 14, 2019 11:31 am
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 7
Views: 51

Re: Electronegativity

You can use the periodic trends to find which atoms are more electronegative.
by Arvind 4G
Thu Nov 07, 2019 10:44 am
Forum: Bond Lengths & Energies
Topic: Bonding
Replies: 7
Views: 74

Re: Bonding

The third row of the periodic table and beyond can have expanded octets as they have the d orbital available and are also larger atoms.
by Arvind 4G
Thu Nov 07, 2019 10:44 am
Forum: Bond Lengths & Energies
Topic: Bond strengths
Replies: 9
Views: 57

Re: Bond strengths

I would say that in general, say that if a bond is shorter, it is stronger. I am not sure if there are any exceptions to this rule.
by Arvind 4G
Thu Nov 07, 2019 10:43 am
Forum: Bond Lengths & Energies
Topic: Short bond lengths vs long bond lengths
Replies: 6
Views: 56

Re: Short bond lengths vs long bond lengths

Shorter bonds mean that the nucleus has a better pull on the electrons involved in the bonding.
by Arvind 4G
Thu Nov 07, 2019 10:41 am
Forum: Electronegativity
Topic: Electron affinity
Replies: 4
Views: 28

Re: Electron affinity

Electron affinity is how much energy is released when an atom receives an electron.
by Arvind 4G
Thu Nov 07, 2019 10:40 am
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 22
Views: 136

Re: Trend of Electronegativity

Electronegativity increases up the periodic table and to the right.
by Arvind 4G
Mon Oct 28, 2019 10:53 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 10
Views: 66

Re: Lone Pairs

Lone pairs are electrons in the structure that are not shared between atoms or in other words, not involved in a bond. They are generally represented by dots around the atom that they belong to.
by Arvind 4G
Mon Oct 28, 2019 10:51 pm
Forum: Ionic & Covalent Bonds
Topic: Ground State
Replies: 11
Views: 84

Re: Ground State

This is the state of the atom when it is at its lowest energy.
by Arvind 4G
Mon Oct 28, 2019 10:48 pm
Forum: Resonance Structures
Topic: Resonance Clarification
Replies: 8
Views: 58

Re: Resonance Clarification

This means that there are multiple possibilities for electron placement, but instead of there being different molecules with different electron placement, the electrons are delocalized and move freely giving the molecule more stability.
by Arvind 4G
Mon Oct 28, 2019 10:46 pm
Forum: Octet Exceptions
Topic: expanded octet?
Replies: 9
Views: 80

Re: expanded octet?

They do not have a filled d orbital and are thus able to have expanded octets.
by Arvind 4G
Mon Oct 28, 2019 10:45 pm
Forum: Octet Exceptions
Topic: aufbau principle
Replies: 8
Views: 85

Re: aufbau principle

The 3d is in the energy level of n=3 which has less energy than the 4s which is in the energy level of n=4.
by Arvind 4G
Thu Oct 24, 2019 12:25 am
Forum: Ionic & Covalent Bonds
Topic: Ionic Compounds
Replies: 6
Views: 85

Re: Ionic Compounds

Yes, one electron is given creating a cation while another atom receives an electron creating an anion. These are attracted to each other like magnets keeping the atoms bonded.
by Arvind 4G
Thu Oct 24, 2019 12:24 am
Forum: Ionic & Covalent Bonds
Topic: Resonance
Replies: 12
Views: 111

Re: Resonance

Their electrons are very mobile and delocalized which gives them stability.
by Arvind 4G
Thu Oct 24, 2019 12:21 am
Forum: Ionic & Covalent Bonds
Topic: Octet Rule
Replies: 6
Views: 60

Re: Octet Rule

They don't fill up their second shell, rather they lose electrons to fill only their first shell which only has two electrons.
by Arvind 4G
Thu Oct 24, 2019 12:20 am
Forum: Ionic & Covalent Bonds
Topic: Double Bond vs Single Bond Length
Replies: 6
Views: 125

Re: Double Bond vs Single Bond Length

In general, yes. The NO3 is a special case of resonance as its double bond is not on one of the bonds, but rather each bond is a bit stronger than a single bond and a bit weaker than a double bond.
by Arvind 4G
Thu Oct 24, 2019 12:18 am
Forum: Lewis Structures
Topic: Electronegativity
Replies: 5
Views: 51

Re: Electronegativity

You can look at the periodic table and using the trend that it increases up and to the right (excluding noble gases), be able to compare between two elements.
by Arvind 4G
Thu Oct 17, 2019 1:38 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron spin
Replies: 8
Views: 97

Re: Electron spin

As long as you remember that +1/2 is a positive spin and -1/2 is a negative spin, that's all I think matters
by Arvind 4G
Thu Oct 17, 2019 1:35 am
Forum: Photoelectric Effect
Topic: Particle vs. Wave Model
Replies: 5
Views: 45

Re: Particle vs. Wave Model

Photons act as both waves and particles giving them properties of both. Because of this we describe them as being both
by Arvind 4G
Thu Oct 17, 2019 1:34 am
Forum: Photoelectric Effect
Topic: Photoelectric effect
Replies: 5
Views: 62

Re: Photoelectric effect

The different energy specifications for each metal will be given in the problem
by Arvind 4G
Thu Oct 17, 2019 1:31 am
Forum: Properties of Electrons
Topic: electron mass
Replies: 8
Views: 71

Re: electron mass

It will be given on the formula sheet.
by Arvind 4G
Thu Oct 17, 2019 1:31 am
Forum: Properties of Electrons
Topic: Momentum
Replies: 11
Views: 59

Re: Momentum

Momentum is the mass of a particle multiplied by its velocity. Momentum takes into account the mass of a particle in addition to its velocity.
by Arvind 4G
Thu Oct 17, 2019 1:29 am
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 106

Re: Constant for Speed of Light

I would use the more specific value as it will give you a more exact answer.
by Arvind 4G
Thu Oct 10, 2019 11:00 am
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 17
Views: 275

Re: Combustion

Combustion is when a carbon based compound reacts with oxygen to form carbon dioxide and water. To represent it in an equation you just have to react the initial compound with oxygen.
by Arvind 4G
Thu Oct 10, 2019 10:58 am
Forum: Significant Figures
Topic: Do we use molar mass ?
Replies: 8
Views: 79

Re: Do we use molar mass ?

Usually you don't want to use sig figs or round until the end of the problem, so until then use the whole value if you can.
by Arvind 4G
Thu Oct 10, 2019 10:57 am
Forum: SI Units, Unit Conversions
Topic: Accuracy vs Precision
Replies: 11
Views: 138

Re: Accuracy vs Precision

Accuracy is how close a value is to the accepted value while precision is how consistent you are with getting results, regardless if they are accurate or not. Hope this helps!
by Arvind 4G
Thu Oct 10, 2019 10:56 am
Forum: Balancing Chemical Reactions
Topic: Fractions
Replies: 20
Views: 241

Re: Fractions

I would convert all fractions into an integer but using fractions is a good way to keep the numbers straight and helps initially with balancing.
by Arvind 4G
Thu Oct 10, 2019 10:55 am
Forum: Molarity, Solutions, Dilutions
Topic: G 25
Replies: 7
Views: 136

Re: G 25

You can double the solution 90 times by raising 2 to the 90 power and multiplying that with the initial volume.
by Arvind 4G
Wed Oct 02, 2019 6:59 pm
Forum: Empirical & Molecular Formulas
Topic: HW E17 part C
Replies: 5
Views: 78

Re: HW E17 part C

Yes, you would be correct. It looks like a trick question as for any compound or element, the number of atoms in a mole is constant.
by Arvind 4G
Wed Oct 02, 2019 6:58 pm
Forum: Empirical & Molecular Formulas
Topic: H25 Fundamental Question
Replies: 3
Views: 61

Re: H25 Fundamental Question

Those refer to the different oxidation states of those respective phosphorus atoms. In order to differentiate between the two oxides that would otherwise have the same name, they include the oxidation state in parentheses to specify which oxide they are referring to.
by Arvind 4G
Wed Oct 02, 2019 6:56 pm
Forum: Empirical & Molecular Formulas
Topic: Homework problem E1
Replies: 9
Views: 114

Re: Homework problem E1

The problem is asking how long the chain is where the chain is 1 mole of argon atoms long. It gives you the length of one of the argon atoms and you would then just multiply that by how many atoms are in a mole (Avogadro's number) to find how long the chain is.
by Arvind 4G
Wed Oct 02, 2019 6:54 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding for Formulas
Replies: 8
Views: 120

Re: Rounding for Formulas

I don't know that there is a specific cutoff, but you should come fairly close to it. If you are off by a significant amount, I would go back and double check your work on that problem.
by Arvind 4G
Wed Oct 02, 2019 6:38 pm
Forum: Empirical & Molecular Formulas
Topic: Question about Theoretical Yield
Replies: 8
Views: 126

Re: Question about Theoretical Yield

No, they should be the same. If you calculate the theoretical yield in moles then you can convert that into grams as well. Grams and moles can be converted back and forth into one another so when calculating in one, you can just convert it to the other.

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