Search found 50 matches

by Tracey Tran 3I
Sat Dec 07, 2019 5:41 pm
Forum: Naming
Topic: bis-,tris-,tetrakis-
Replies: 2
Views: 31

bis-,tris-,tetrakis-

When do we use the prefixes bis-, tris-, tetrakis- instead of bi-, tri-, tetra and why?
by Tracey Tran 3I
Sat Dec 07, 2019 5:40 pm
Forum: Biological Examples
Topic: Porphyrin
Replies: 1
Views: 34

Porphyrin

What does porphyrin mean?
by Tracey Tran 3I
Sat Dec 07, 2019 5:39 pm
Forum: Biological Examples
Topic: Hemoglobin
Replies: 4
Views: 91

Hemoglobin

How is hemoglobin made?
by Tracey Tran 3I
Sat Dec 07, 2019 5:35 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs Amphiprotic
Replies: 11
Views: 366

Amphoteric vs Amphiprotic

What is the difference between an amphoteric and amphiprotic molecule?
by Tracey Tran 3I
Sat Dec 07, 2019 5:31 pm
Forum: Identifying Acidic & Basic Salts
Topic: Nonmetal oxides
Replies: 2
Views: 95

Nonmetal oxides

Why do nonmetal oxides not dissociate in the presence of water?
by Tracey Tran 3I
Sun Dec 01, 2019 2:39 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength
Replies: 3
Views: 65

Acid Strength

Why does increasing the number of oxygen atoms make the acid stronger?
by Tracey Tran 3I
Sun Dec 01, 2019 2:36 am
Forum: Biological Examples
Topic: Cisplatin vs Transplatin
Replies: 2
Views: 39

Cisplatin vs Transplatin

Why is cisplatin used to treat cancer but not transplatin?
by Tracey Tran 3I
Sun Dec 01, 2019 2:35 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape
Replies: 1
Views: 31

Shape

What is the shape of a coordination compound that has 3 ligands?
by Tracey Tran 3I
Sun Dec 01, 2019 2:34 am
Forum: Conjugate Acids & Bases
Topic: Strength of Conjugate Acids and Bases
Replies: 3
Views: 57

Strength of Conjugate Acids and Bases

Why are conjugate bases of strong acids weak?
by Tracey Tran 3I
Sun Dec 01, 2019 2:33 am
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 4
Views: 42

Lewis vs Bronsted

Is it possible for an element or molecule to be a Lewis acid or base but not a Bronsted acid or base?
by Tracey Tran 3I
Sat Nov 23, 2019 10:35 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids
Replies: 13
Views: 213

Acids

What acids are we expected to know?
by Tracey Tran 3I
Sat Nov 23, 2019 10:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand
Replies: 3
Views: 34

Ligand

What is a ligand?
by Tracey Tran 3I
Sat Nov 23, 2019 10:33 pm
Forum: Biological Examples
Topic: Biological Importance
Replies: 6
Views: 59

Biological Importance

What elements/molecules are we expected to know the biological importance/function of?
by Tracey Tran 3I
Sat Nov 23, 2019 10:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation Number
Replies: 3
Views: 40

Oxidation Number

How do we determine oxidation number?
by Tracey Tran 3I
Sat Nov 23, 2019 10:32 pm
Forum: Naming
Topic: Prefixes
Replies: 4
Views: 50

Prefixes

When do we use the prefixes, bis, tris, tetrakis, pentakis?
by Tracey Tran 3I
Thu Nov 14, 2019 11:04 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Electrons
Replies: 9
Views: 104

Electrons

How does spreading electrons further apart make the molecule more stable?
by Tracey Tran 3I
Thu Nov 14, 2019 10:58 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion
Replies: 1
Views: 33

Repulsion

Why do lone pairs have more repulsion power than bond pairs?
by Tracey Tran 3I
Thu Nov 14, 2019 10:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Arrangement vs Shape
Replies: 3
Views: 26

Arrangement vs Shape

What is the difference between the arrangement and shape of a molecule?
by Tracey Tran 3I
Thu Nov 14, 2019 10:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 3
Views: 47

VSEPR Formula

How do you determine VSEPR formula?
by Tracey Tran 3I
Thu Nov 14, 2019 10:55 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 9
Views: 68

Bond Angle

Why is the bond angle of a trigonal pyramidal a little less than 109.5 degrees instead of being exactly 109.5 degrees?
by Tracey Tran 3I
Thu Nov 07, 2019 1:09 pm
Forum: Coordinate Covalent Bonds
Topic: Elements that can form coordinate covalent bonds
Replies: 2
Views: 54

Elements that can form coordinate covalent bonds

Are there elements that are more likely to provide the two electrons for a coordinate covalent bond? If so, why?
by Tracey Tran 3I
Thu Nov 07, 2019 1:01 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths in resonance structures
Replies: 2
Views: 33

Bond lengths in resonance structures

How do we determine the bond length in resonance structures? Is it just the average of all the bond lengths?
by Tracey Tran 3I
Thu Nov 07, 2019 1:00 pm
Forum: Bond Lengths & Energies
Topic: Bond Length differences
Replies: 2
Views: 38

Bond Length differences

Why is a double bond not half the length of a single bond?
by Tracey Tran 3I
Thu Nov 07, 2019 12:58 pm
Forum: Dipole Moments
Topic: Induced Dipole
Replies: 4
Views: 40

Induced Dipole

How is a dipole induced?
by Tracey Tran 3I
Thu Nov 07, 2019 12:51 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability of Anions
Replies: 3
Views: 38

Polarizability of Anions

Are more negatively charged anions more polarizable or are less negatively charged anions more polarizable why?
by Tracey Tran 3I
Sun Nov 03, 2019 10:07 am
Forum: Bond Lengths & Energies
Topic: Bond Strength
Replies: 6
Views: 58

Bond Strength

Why are shorter bond lengths stronger?
by Tracey Tran 3I
Sun Nov 03, 2019 10:06 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Stability
Replies: 3
Views: 73

Formal Charge Stability

Why are molecules with lower formal charge more stable?
by Tracey Tran 3I
Sun Nov 03, 2019 10:02 am
Forum: Electronegativity
Topic: electronegativity trend
Replies: 9
Views: 91

electronegativity trend

Why does electronegativity decrease going down the column?
by Tracey Tran 3I
Sun Nov 03, 2019 10:01 am
Forum: Dipole Moments
Topic: Significance
Replies: 2
Views: 29

Significance

What is the significance of dipole moments in chemistry?
by Tracey Tran 3I
Sun Nov 03, 2019 9:59 am
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 1
Views: 44

Octet Exceptions

How can some elements accommodate more than 8 valence electrons but others can't?
by Tracey Tran 3I
Wed Oct 23, 2019 9:27 pm
Forum: Ionic & Covalent Bonds
Topic: lewis structures for diff bonds
Replies: 5
Views: 93

Re: lewis structures for diff bonds

Yes, we still draw lewis structures for both ionic and covalent bonds. In class potassium chloride was drawn as K+ [ Cl ]-. The Cl has 8 electrons surrounding it.
by Tracey Tran 3I
Wed Oct 23, 2019 9:24 pm
Forum: Resonance Structures
Topic: defintion
Replies: 7
Views: 96

Re: defintion

Yes, it is when some lewis structures have multiple bonds in different equivalent locations.
by Tracey Tran 3I
Wed Oct 23, 2019 9:22 pm
Forum: Ionic & Covalent Bonds
Topic: Octet Rule
Replies: 6
Views: 74

Octet Rule

Why are H, He, Li, and Be exceptions to the octet rule?
by Tracey Tran 3I
Wed Oct 23, 2019 9:20 pm
Forum: Ionic & Covalent Bonds
Topic: Double Bond vs Single Bond Length
Replies: 6
Views: 170

Double Bond vs Single Bond Length

Are double bonds shorter than single bonds because they're stronger? If so, then why is the observed N-O bond length in the NO3- 1.24 A.
by Tracey Tran 3I
Wed Oct 23, 2019 9:16 pm
Forum: Ionic & Covalent Bonds
Topic: Resonance
Replies: 12
Views: 186

Resonance

Why are compounds with resonance considered more stable?
by Tracey Tran 3I
Sun Oct 20, 2019 3:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Opposite Spin
Replies: 5
Views: 89

Opposite Spin

Why do electrons in an orbital have opposite spins?
by Tracey Tran 3I
Sun Oct 20, 2019 3:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 5
Views: 71

Electron Configuration Exceptions

What are the exceptions to electron configuration, and why do those exceptions exist?
by Tracey Tran 3I
Sun Oct 20, 2019 3:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Plane
Replies: 3
Views: 37

Nodal Plane

What is the purpose of a nodal plane and why does s- orbitals not have it but others do?
by Tracey Tran 3I
Sun Oct 20, 2019 3:10 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 2
Views: 48

Quantum Numbers

When does ms equal +1/2 and when does it equal -1/2
by Tracey Tran 3I
Sun Oct 20, 2019 3:07 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 7
Views: 100

Photoelectric Effect

Can someone explain why increasing the intensity of light does not help eject an electron again?
by Tracey Tran 3I
Sat Oct 12, 2019 12:21 am
Forum: Properties of Electrons
Topic: Wave properties
Replies: 5
Views: 47

Re: Wave properties

All matter has wavelike properties, but only moving objects with extremely small mass such as electrons can be thoroughly observed/detected.
by Tracey Tran 3I
Sat Oct 12, 2019 12:13 am
Forum: Quantum Numbers and The H-Atom
Topic: Help with 1A. 11
Replies: 1
Views: 26

Re: Help with 1A. 11

The quantum number for the lower energy level is the same for every absorption line in each series. For example, the Lyman series has a lower energy level of n=1 for all of the absorption lines.
by Tracey Tran 3I
Sat Oct 12, 2019 12:04 am
Forum: Einstein Equation
Topic: Cancelling out units
Replies: 2
Views: 57

Re: Cancelling out units

The units of h, which is Planck's Constant is Js. Joules=kgm^2s^-2. Mass is in the units of kilogram, and velocity has units of m/s. Therefore you have [(kgm^2s^-2)(s)] / [(kg)(m/s)]. The kilograms cancel out: [( kg m^2s^-2)(s)] / [( kg )(m/s)]. The seconds cancel out: [( kg m^2 s^-2 )( s )] / [( kg...
by Tracey Tran 3I
Fri Oct 11, 2019 11:51 pm
Forum: Properties of Light
Topic: Homework question 1E.5?
Replies: 1
Views: 66

Re: Homework question 1E.5?

a) False because electrons in lower energy levels/orbitals shield electrons in higher ones due to electron repulsion. Thus, electrons in higher orbital levels experience less attraction to the nucleus. b) True c) False because electrons attraction to the nucleus decrease as l increases, decreasing t...
by Tracey Tran 3I
Fri Oct 11, 2019 11:39 pm
Forum: Properties of Light
Topic: Question 1B7
Replies: 1
Views: 23

Re: Question 1B7

a) Using the equation c=vλ, we can replace v in the equation E=hv with c/λ. E=hc/λ=(6.626x10^-34)(2.997x10^8)/(589x10^-9)=3.37X10^-19J b) For this problem I used dimensional analysis: 5.00x10^-3 g Na (1 mol Na/22.99g Na ) ( 6.022x10^23 atoms/1 mol Na)( 3.37x10^-19 J/ 1 atom)= 44.1 J c) Dimensional a...
by Tracey Tran 3I
Fri Oct 04, 2019 8:26 pm
Forum: SI Units, Unit Conversions
Topic: Rounding
Replies: 6
Views: 111

Re: Rounding

There is no need to directly indicate it. Just write as many digits as you consider necessary. I usually do two or three digits more than the sig figs for the final answer.
by Tracey Tran 3I
Fri Oct 04, 2019 8:23 pm
Forum: Molarity, Solutions, Dilutions
Topic: G23
Replies: 2
Views: 80

G23

In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL of a solution containing 0.50 g of NaCl and 0.30 g of KCl, as well as glucose and other sugars. What is the concentration of chloride ions in the solution? D...
by Tracey Tran 3I
Fri Oct 04, 2019 8:11 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 3
Views: 50

Sig Figs

If there is both multiplication/division and addition/subtraction in a problem, how do we determine the sig figs for the final answer?
by Tracey Tran 3I
Fri Oct 04, 2019 8:09 pm
Forum: Balancing Chemical Reactions
Topic: Question on H15
Replies: 3
Views: 84

Re: Question on H15

A molecule is aqueous if it can be dissolved in water.
by Tracey Tran 3I
Fri Oct 04, 2019 8:03 pm
Forum: Balancing Chemical Reactions
Topic: M9
Replies: 2
Views: 74

M9

Can someone refresh me on how to write ionic equations?

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