Search found 42 matches

by Jessica Luong 3E
Sun Nov 24, 2019 11:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Focus 2.63
Replies: 1
Views: 45

Focus 2.63

Estimate the bond angles marked with arcs and lowercase letters in peroxyacetylnitrate, an eye irritant in smog: Peroxyacetylnitrate
by Jessica Luong 3E
Sun Nov 24, 2019 11:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Focus 2.61
Replies: 1
Views: 22

Focus 2.61

Methane, the most abundant hydrocarbon in the atmo- sphere and a potent greenhouse gas, is slowly oxidized in the air to carbon dioxide. An intermediate in the oxidation of methane to carbon dioxide is HOCO. (a) Draw the Lewis structure for this compound. (b) Decide whether the compound is a radical.
by Jessica Luong 3E
Sun Nov 24, 2019 11:24 pm
Forum: Hybridization
Topic: Focus 2.57
Replies: 4
Views: 42

Focus 2.57

Acetonitrile, CH3CN, is used as a solvent in the pharmaceu- tical industry. Describe the structure of the CH3CN molecule in terms of hybrid orbitals, bond angles, and s- and p-bonds. The N atom is a terminal atom.
by Jessica Luong 3E
Sun Nov 24, 2019 11:24 pm
Forum: Hybridization
Topic: Focus 2.45
Replies: 3
Views: 42

Focus 2.45

Consider the bonding in H2CPCHCHO. (a) Draw the most important Lewis structure. Include all nonzero formal charges. (b) Identify the composition of the bonds and the hybridization of each lone pair—for example, by writing s(H1s,C2sp2).
by Jessica Luong 3E
Sun Nov 24, 2019 11:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Focus 2.27
Replies: 1
Views: 25

Focus 2.27

(a) Draw a Lewis structure for each of the following species: CH31; CH4; CH32; CH2; CH221; CH222. (b) Identify each as a radical or not. (c) Rank them in order of increasing HCH bond angles. Explain your choices.
by Jessica Luong 3E
Sun Nov 24, 2019 11:22 pm
Forum: Hybridization
Topic: 2F.17
Replies: 1
Views: 24

2F.17

Describe the structure of the formaldehyde molecule, CH2O, in terms of hybrid orbitals, bond angles, and s- and p-bonds. The C atom is the central atom to which the other three atoms are attached.
by Jessica Luong 3E
Sun Nov 24, 2019 11:21 pm
Forum: Hybridization
Topic: 2F.15
Replies: 1
Views: 20

2F.15

Noting that the bond angle of an sp3 hybridized atom is 109.58 and that of an sp2 hybridized atom is 1208, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?
by Jessica Luong 3E
Sun Nov 24, 2019 11:21 pm
Forum: Hybridization
Topic: 2F.13
Replies: 3
Views: 44

2F.13

Acrylonitrile, CH CHCN, is used in the synthesis of 2
acrylic fibers (polyacrylonitriles), such as Orlon. Draw the Lewis structure of acrylonitrile and describe the hybrid orbitals on each carbon atom. What are the approximate values of the bond angles?
by Jessica Luong 3E
Sun Nov 24, 2019 11:21 pm
Forum: Hybridization
Topic: 2F.9
Replies: 1
Views: 27

2F.9

Identify the hybrid orbitals used by the phosphorus atom in each of the following species: (a) PCl41; (b) PCl62; (c) PCl5; (d) PCl3.
by Jessica Luong 3E
Sun Nov 24, 2019 11:20 pm
Forum: Hybridization
Topic: 2F.7
Replies: 1
Views: 30

2F.7

Identify the hybrid orbitals used by the atom in boldface red type in each of the following species: (a) BF3; (b) AsF3; (c) BrF3; (d) SeF31.
by Jessica Luong 3E
Sun Nov 24, 2019 11:20 pm
Forum: Hybridization
Topic: 2F.5
Replies: 3
Views: 23

2F.5

State the hybridization of the atom in boldface red type in each of the following molecules and ions: (a) BeCl2; (b) BH3; (c) BH42; (d) SiF4.
by Jessica Luong 3E
Sun Nov 24, 2019 11:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F.3
Replies: 3
Views: 14

2F.3

How many s-bonds and how many p-bonds are there in (a) H2S and (b) SO2?
by Jessica Luong 3E
Sun Nov 24, 2019 11:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.29
Replies: 3
Views: 24

2E.29

There are three isomers of dichlorobenzene, C6H4Cl2, which differ in the relative positions of the chlorine atoms on the benzene ring. (a) Which of the three forms are polar? (b) Which has the largest dipole moment?
by Jessica Luong 3E
Sun Nov 24, 2019 11:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.27
Replies: 1
Views: 19

2E.27

Predict whether each of the following molecules is likely to be polar or nonpolar: (a) C5H5N (pyridine, a molecule like benzene except that one OCHO group is replaced by a nitrogen atom); (b) C2H6 (ethane); (c) CHCl3 (trichloromethane, also known as chloroform, a common organic solvent and once used...
by Jessica Luong 3E
Sun Nov 24, 2019 11:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.25
Replies: 2
Views: 24

2E.25

Draw the Lewis structure and predict whether each of the following molecules is polar or nonpolar: (a) CH2Cl2; (b) CCl4; (c) CS2; (d) SF4.
by Jessica Luong 3E
Sun Nov 24, 2019 11:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.23
Replies: 1
Views: 20

2E.23

Draw the Lewis structure and predict the shape of (a) OSbCl3; (b) SO2Cl2; (c) IO2F22. The atom in boldface red type is the central atom.
by Jessica Luong 3E
Sun Nov 24, 2019 11:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shape
Replies: 21
Views: 96

T-shape

What are T-shapes?
by Jessica Luong 3E
Sat Nov 02, 2019 5:35 pm
Forum: Dipole Moments
Topic: Interaction between ions and molecules
Replies: 2
Views: 16

Interaction between ions and molecules

What are interionic and intermolecular attractive forces?
by Jessica Luong 3E
Sat Nov 02, 2019 5:32 pm
Forum: Electronegativity
Topic: What is isoelectronic?
Replies: 13
Views: 55

What is isoelectronic?

What is isoelectronic?
by Jessica Luong 3E
Sat Nov 02, 2019 5:30 pm
Forum: Trends in The Periodic Table
Topic: Period Trends
Replies: 4
Views: 19

Period Trends

Are there any other trends besides electron affinity, ionization, and electronegativity?
by Jessica Luong 3E
Sat Nov 02, 2019 5:29 pm
Forum: Quantum Numbers and The H-Atom
Topic: 4th Quantum Number
Replies: 3
Views: 24

4th Quantum Number

How do you find the 4th quantum number?
by Jessica Luong 3E
Sat Nov 02, 2019 5:22 pm
Forum: Octet Exceptions
Topic: Covalent Bond
Replies: 4
Views: 24

Covalent Bond

What is a coordinate covalent bond?
by Jessica Luong 3E
Mon Oct 28, 2019 12:35 am
Forum: Ionic & Covalent Bonds
Topic: 2A.11
Replies: 4
Views: 35

2A.11

Which M31 ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar]3d6; (b) [Ar]3d5; (c) [Kr]4d5; (d) [Kr]4d3?
by Jessica Luong 3E
Mon Oct 28, 2019 12:33 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.11
Replies: 1
Views: 18

1E.11

Write the ground-state electron configuration for each of the following atoms: (a) sodium; (b) silicon; (c) chlorine; (d) rubidium.
by Jessica Luong 3E
Mon Oct 28, 2019 12:32 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.9
Replies: 1
Views: 19

1E.9

Of the following sets of four quantum numbers {n,l,ml,ms}, identify the ones that are forbidden for an electron in an atom and explain why they are invalid:
(a) {54,2,21,16}; (b) {55,0,21,16}; (c) {54,4,21,16}.
by Jessica Luong 3E
Mon Oct 28, 2019 12:30 am
Forum: Quantum Numbers and The H-Atom
Topic: 1D.21
Replies: 2
Views: 26

1D.21

Write the subshell notation (3d, for instance) and the number of orbitals having the following quantum numbers: (a) n 5 5, l52; (b) n51,l50;(c) n56,l53; (d) n52,l51.
by Jessica Luong 3E
Mon Oct 28, 2019 12:29 am
Forum: Quantum Numbers and The H-Atom
Topic: 1D.17
Replies: 3
Views: 30

1D.17

For each orbital listed in Exercise 1D.15, give the possible values of the magnetic quantum number.
by Jessica Luong 3E
Sun Oct 20, 2019 10:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: What is electron configuration?
Replies: 3
Views: 30

What is electron configuration?

Can someone help me break down electron configuration and explain what it is?
by Jessica Luong 3E
Sun Oct 20, 2019 10:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Stern and Gerlach Experiment: Electron Spin
Replies: 3
Views: 19

Stern and Gerlach Experiment: Electron Spin

Hi, can someone re-explain to me the "stern and gerlach experiment: electron spin" from class? I didn't quite understand the concept.
by Jessica Luong 3E
Sun Oct 20, 2019 10:30 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 3
Views: 37

Nodal Planes

Why do we have to know about the nodal planes? What's their relevance to the orbitals?
by Jessica Luong 3E
Sun Oct 20, 2019 10:29 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 2
Views: 22

Schrodinger's Equation

What does schrodinger's equation look like?
by Jessica Luong 3E
Sun Oct 20, 2019 10:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atomic Orbitals
Replies: 3
Views: 36

Atomic Orbitals

What's the importance of the orbitals? Why do we need to know this?
by Jessica Luong 3E
Sun Oct 13, 2019 11:27 pm
Forum: Properties of Light
Topic: Spectroscopic Analysis
Replies: 1
Views: 10

Spectroscopic Analysis

What is spectroscopic analysis? What do we use this for?
by Jessica Luong 3E
Sun Oct 13, 2019 11:23 pm
Forum: Properties of Light
Topic: Equations
Replies: 2
Views: 33

Equations

In what situations do you use De Broglie's equation, Heisenberg's equation, and Schrodinger's equation?
by Jessica Luong 3E
Sun Oct 13, 2019 11:18 pm
Forum: Properties of Light
Topic: Kydberg's Constant
Replies: 1
Views: 7

Kydberg's Constant

In what equation do we use Kydberg's Constant, 3.29 x 10^15?
by Jessica Luong 3E
Sun Oct 13, 2019 11:15 pm
Forum: Properties of Light
Topic: Energy Equation
Replies: 3
Views: 19

Energy Equation

What is "h" in the equations we have been using? It's the one with the same numbers, 6.626 x 10^-34 Js.
by Jessica Luong 3E
Sun Oct 13, 2019 11:12 pm
Forum: Properties of Light
Topic: What is Threshold Energy?
Replies: 9
Views: 51

What is Threshold Energy?

Can someone re-explain to me what a threshold energy is? What do we need to know this for? Thank you!
by Jessica Luong 3E
Sat Oct 05, 2019 1:15 pm
Forum: SI Units, Unit Conversions
Topic: Polyatomic ions
Replies: 3
Views: 31

Re: Polyatomic ions

Omg thank you so much! This chart and the naming iconic compound video is really helpful!!
by Jessica Luong 3E
Sat Oct 05, 2019 1:09 pm
Forum: Balancing Chemical Reactions
Topic: H.5
Replies: 2
Views: 32

Re: H.5

When balancing equations, make sure you start with the element with the least amount of atoms. In this case, it should be Mg. However, both sides of the equation have exactly 1 Mg, so you didn't need to do anything. Next, you should look at N. There are 6 N atoms on the left side and 3 on the right ...
by Jessica Luong 3E
Sat Oct 05, 2019 12:53 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Naming Compounds
Replies: 3
Views: 59

Naming Compounds

What other prefixes/suffixes should I be aware of when naming compounds? The only ones I've seen so far were di-, -ate, and -ite. If there are more, please reply below because I don't wanna bomb my first test.
by Jessica Luong 3E
Sat Oct 05, 2019 12:42 pm
Forum: SI Units, Unit Conversions
Topic: Charges
Replies: 2
Views: 17

Charges

What's the significance of an ion's charge when writing compound formulas? Why is it relevant to know whether or not the charge is positive or negative? Also, do you guys know if these will be on the test?
by Jessica Luong 3E
Sat Oct 05, 2019 12:39 pm
Forum: SI Units, Unit Conversions
Topic: Polyatomic ions
Replies: 3
Views: 31

Polyatomic ions

Does anyone have any easy tips/tricks to memorizing the polyatomic ions?

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