Search found 21 matches

by Nadeen 3D
Fri Dec 07, 2018 1:11 am
Forum: Amphoteric Compounds
Topic: Amphiprotic vs. amphoteric
Replies: 3
Views: 54

Amphiprotic vs. amphoteric

What is the difference between Amphiprotic vs. amphoteric? and if you can please give an example.
by Nadeen 3D
Thu Dec 06, 2018 11:49 pm
Forum: Conjugate Acids & Bases
Topic: Charges when naming it acid or base
Replies: 1
Views: 51

Charges when naming it acid or base

How come when a negatively charged compound formed with water is still an acid? Isn't it when a compound is negatively charged it's a base or when it is added with water there is an exception?

For example H2PO4- (acid) +H20 (base)
by Nadeen 3D
Tue Nov 27, 2018 7:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs. Non-polar
Replies: 6
Views: 81

Polar vs. Non-polar

Are we able to distinguish a molecule polar or non-polar if there is an ion? Because when I was doing practice problems, when distinguishing polarity a lot of the answers said n/a. So does that mean we do not know whether the molecule is polar vs. nonpolar?
by Nadeen 3D
Tue Nov 27, 2018 6:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angle Distorted
Replies: 4
Views: 68

Angle Distorted

I was wondering what 'angle distorted' means when it comes to the molecular geometry?
by Nadeen 3D
Tue Nov 27, 2018 2:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent shape
Replies: 1
Views: 18

Bent shape

Is another word for bent angular? (I noticed bent shapes being called angular but just want to make sure)

Also, if the molecular shape has only one lone pair and two bonds attached, is that considered bent? (because bent has 2 lone pairs)
by Nadeen 3D
Mon Nov 26, 2018 12:08 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs. Non-polar
Replies: 3
Views: 46

Polar vs. Non-polar

I have trouble really distinguishing between polar and non-polar and I've done practice problems but can some explain the concept to me a little more and provide examples?
by Nadeen 3D
Mon Nov 26, 2018 12:05 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Test
Replies: 5
Views: 73

Re: Test

I believe it will cover Molecular shape, VSEPR Theory, Valence-bond theory, hybridization, pie, sigma, Molecular Orbital Theory. I think you should review note, watch videos online(it really helps me), and the homework problems.
by Nadeen 3D
Mon Nov 26, 2018 12:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework Help Chapter 4 #5
Replies: 2
Views: 23

Homework Help Chapter 4 #5

(a) What is the shape of the ClO2 + ion? (b) What is the expected OClO bond angle?

When I tried solving this problem, the molecular shape was bent(well the way I drew it), but why was the answer trigonal planar?
by Nadeen 3D
Mon Nov 26, 2018 12:00 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Nodal Planes
Replies: 3
Views: 36

Re: Nodal Planes

A nodal plane which is sometimes called an angular plane is where you will likely not find an electron in the orbital. For example, the 2s orbital has one nodal plane and the 2pz and 2p has one orbital.
by Nadeen 3D
Sun Nov 25, 2018 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming Shapes
Replies: 5
Views: 39

Re: Naming Shapes

Hello,
Memorizing the shapes would be ideal but also understanding when to use them. There are problems that are trying to trick you, so just really try to memorize but understand how to name them. Hope this helped.
by Nadeen 3D
Sun Nov 25, 2018 11:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 4
Views: 30

Molecular Shape

I was wondering if formal charge matters when drawing out the molecular shape or is it only for the Lewis structure?
by Nadeen 3D
Sun Nov 11, 2018 11:29 pm
Forum: General Science Questions
Topic: Homework Problem help #2.39
Replies: 1
Views: 56

Homework Problem help #2.39

2.39 Determine whether each of the following electron configurations represents the ground state or an excited state of the atom given. I got lost trying to figure this out if someone can explain the concept behind it or help me solve it would be great. There is more to the question and is hard to p...
by Nadeen 3D
Sun Nov 11, 2018 11:16 pm
Forum: Dipole Moments
Topic: Test
Replies: 15
Views: 176

Re: Test

The test will be in week 9 after Thanksgiving.
by Nadeen 3D
Sun Nov 11, 2018 11:09 pm
Forum: Lewis Structures
Topic: VSEPR Model
Replies: 6
Views: 114

Re: VSEPR Model

The purpose of the VSEPR Model is to determine the arrangments of the electrons pairs around non-hydrogen atoms. It also helps predict the structure of almost any molecule or polyatomic ion in which the middle atom is a nonmetal.
by Nadeen 3D
Fri Nov 02, 2018 8:07 pm
Forum: DeBroglie Equation
Topic: equation definition
Replies: 5
Views: 148

Re: equation definition

The De Broglie equation has to do with the matter. For instance, moving objects like a baseball. When solving for the wavelength of light, it is matterless.
by Nadeen 3D
Fri Nov 02, 2018 8:05 pm
Forum: DeBroglie Equation
Topic: Hw problem 1.37- 6th edition
Replies: 3
Views: 108

Hw problem 1.37- 6th edition

Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 105 m s 1 in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. How come for this problem the De Brogl...
by Nadeen 3D
Fri Nov 02, 2018 7:58 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation
Replies: 2
Views: 76

De Broglie Equation

A baseball must weigh between 5.00 and 5.25 ounces (1 ounce 28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?

When solving for this, why do we use the De Broglie Equation to calculate wavelength?
by Nadeen 3D
Fri Oct 12, 2018 2:45 am
Forum: SI Units, Unit Conversions
Topic: Units
Replies: 8
Views: 126

Re: Units

I heard that if you miss some units you will be marked down because you should be originally adding them anyways when solving the problem.
by Nadeen 3D
Fri Oct 12, 2018 2:41 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Questions Due Date
Replies: 7
Views: 84

Re: Chemistry Community Questions Due Date

I believe that by having them done by Friday and posting at least 3 times should give you your full points.
by Nadeen 3D
Fri Oct 12, 2018 2:40 am
Forum: Properties of Light
Topic: Homework Problem #7
Replies: 1
Views: 46

Homework Problem #7

1.7 (a) The frequency of violet light is 7.1 1014 Hz. What is the wavelength (in nanometers) of violet light? (b) When an electron beam strikes a block of copper, x-rays with a frequency of 2.0 1018 Hz are emitted. What is the wavelength (in picometers) of these x-rays? I am lost if someone can plea...
by Nadeen 3D
Fri Oct 05, 2018 1:12 am
Forum: Molarity, Solutions, Dilutions
Topic: Chem 14a Problem G.5
Replies: 2
Views: 34

Chem 14a Problem G.5

A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain (a) 2.15 mmol Na ; (b) 4.98 mmol ...

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