Search found 56 matches

by Andrea- 3J
Thu Dec 06, 2018 7:02 pm
Forum: Conjugate Acids & Bases
Topic: 12.3 6th edition
Replies: 1
Views: 31

12.3 6th edition

"Write the proton transfer equilibria for the following acids in aqueous solution and identify the acid-base pairs ...b)C6H5NH3+"

My answer is C6H5NH3+ + H20 -> H3O+ + C6H5NH2

acid: C6H5NH3+"
base: H2O
conjugate acid: H30+
conjugate base: C6H5NH2

Am I correct?
by Andrea- 3J
Thu Dec 06, 2018 6:48 pm
Forum: Conjugate Acids & Bases
Topic: 12.1 6th edition
Replies: 2
Views: 28

12.1 6th edition

"Write the formula for the conjugate bases of d)HCO3- ..."
I am having trouble writing the formula for this conjugate base.
This is what I came up with.

HCO3- + H+ -> CO3^2-

Am I correct?
by Andrea- 3J
Thu Dec 06, 2018 5:30 pm
Forum: Bronsted Acids & Bases
Topic: 6th edition J.1
Replies: 2
Views: 23

Re: 6th edition J.1

*bronsted
by Andrea- 3J
Thu Dec 06, 2018 5:29 pm
Forum: Bronsted Acids & Bases
Topic: 6th edition J.1
Replies: 2
Views: 23

6th edition J.1

"Identify each compound as either a Bronstead acid or a Bronstead base: a) NH3; b)HBr; c)KOH; d)H2SO3; e)Ca(OH)2"
A bronstead acid is a proton donor and a bronstead base is a proton receiver.
How do I identify if each compound is an acid or base?
by Andrea- 3J
Thu Nov 29, 2018 9:38 pm
Forum: Hybridization
Topic: CH2O hybridization
Replies: 9
Views: 416

CH2O hybridization

For CH2O, the VSEPR formula is AX3. The molecular shape is trigonal planar and it is polar.
How do I find it's hybridization?
by Andrea- 3J
Thu Nov 29, 2018 9:31 pm
Forum: Hybridization
Topic: Hybridization connection
Replies: 2
Views: 38

Hybridization connection

How do I connect hybridization with lewis structures, molecular formula, molecular geometry and polarity?
by Andrea- 3J
Thu Nov 29, 2018 9:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar or not polar
Replies: 4
Views: 58

polar or not polar

On the 6th edition on 4.25 it is asking if CH2Cl2 and SF4 is polar or not polar. I came across a chart that says tetrahedrals are not polar while pyramidal structures are polar. CH2Cl2 is a tetrahedral, therefore it is not polar. SF4 is trigonal bipyramidal therefore it is polar. How would I know wh...
by Andrea- 3J
Thu Nov 29, 2018 8:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th edition 4.23
Replies: 3
Views: 25

6th edition 4.23

It says to find the lewis structure and predict the shape of OSCl3, SO2Cl2, and IO2F2-. For OSCl3 the molecular formula is AX4N0 which is a tetrahedral. Did I write the molecular formula correctly? For SO2Cl2 the molecular formula is AX4N0 which is also a tetrahedral. For IO2F2- the molecular formul...
by Andrea- 3J
Thu Nov 29, 2018 7:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angle
Replies: 6
Views: 60

bond angle

For a trigonal planar, bent the bond angle is less than 120.
How do I find the exact angle? Is it acceptable that for the test I put >120 for the bond angle?
by Andrea- 3J
Tue Nov 27, 2018 10:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th edition 4.7 pt b
Replies: 1
Views: 38

6th edition 4.7 pt b

"How many different OSCl bond angles are there in this molecule?"
How do you find the amount and different bond angles?
by Andrea- 3J
Tue Nov 27, 2018 10:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th edition 4.5
Replies: 2
Views: 31

6th edition 4.5

"a) what is the shape of the CLO2+ ion?"
Can someone help me clarify this question? Is it asking to draw the shape or do I just name it. The shape is trigonal planar bent.
How do I find the actual bond angle? All I know is that it is less than 120.
by Andrea- 3J
Thu Nov 15, 2018 8:04 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 6th edition 4.31
Replies: 1
Views: 21

6th edition 4.31

"State the relative orientation of the following hybrid orbitals: a)sp3 b) sp c) sp3d2 d)sp2"

How do I determine the relative orientation of b and d?

For sp3 its 4 electron density groups with tetrahedral orientation
For sp3d2 its 6 electron density groups with octahedral orientation
by Andrea- 3J
Thu Nov 15, 2018 7:53 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 6th edition 4.67
Replies: 2
Views: 42

6th edition 4.67

"Based on their valence-shell electron configurations, which of the following species would you expect to have the lowest ionization energy : a) c2+, b) c2, c) c2-?"

How does the valence shell electron configuration of a,b, and c determine the ionization energy?
by Andrea- 3J
Thu Nov 15, 2018 7:50 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 4.63
Replies: 1
Views: 34

4.63

"Which of the following species are paramagnetic: a) b2; b) b2- c) b2+? If the species is paramagnetic, how many unpaired electrons does it possess?"
Paramagnetic usually means weak attraction. How do I determine how a,b, and c are paramagnetic?
by Andrea- 3J
Thu Nov 08, 2018 6:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: (CH3)2Be shape
Replies: 2
Views: 76

(CH3)2Be shape

What is the difference between the solution manual saying (CH3)2Be is a tetrahedral while the molecule as a while is linear? Can someone explain this?
by Andrea- 3J
Thu Nov 08, 2018 6:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: S2O3 ^2 shape and angles
Replies: 1
Views: 43

S2O3 ^2 shape and angles

How do I determine the shape and predict the bond angles of S2O3 ^2-?
by Andrea- 3J
Thu Nov 08, 2018 5:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 2
Views: 92

VSEPR

Can someone explain to be how to use the VSEPR formula to predict the shape of sulfur tetrachloride?
by Andrea- 3J
Thu Nov 01, 2018 8:07 pm
Forum: Resonance Structures
Topic: chemical formula
Replies: 1
Views: 38

chemical formula

#1nWhat's the difference between chemical formula and molecular formula?

#2 Are bismuth(iii) fluoride the same as bismuth trifluoride?
by Andrea- 3J
Thu Nov 01, 2018 7:47 pm
Forum: Resonance Structures
Topic: Ground State Electron Configuration
Replies: 1
Views: 29

Ground State Electron Configuration

Which is the proper way to write ground state electron configuration?
How should we write it on a test?

1s^2 2s^2 2p^6 3s^2 3p^6 3d^10
OR
[Ar]3d^10
by Andrea- 3J
Thu Nov 01, 2018 7:42 pm
Forum: Resonance Structures
Topic: Ground State Electron Configuration
Replies: 1
Views: 23

Ground State Electron Configuration

6th edition 3.11
Which M^3+ ions (where M is a metal) are predicted to have the following ground state-electron configuration:
a)[Ar]3d^6
b)[Ar]3d^5

I need help finding which metal these configurations go with. Can someone take me step by step by how to find it?
by Andrea- 3J
Wed Oct 24, 2018 10:51 pm
Forum: Trends in The Periodic Table
Topic: Ionization energies
Replies: 9
Views: 126

Re: Ionization energies

Ionization energy increases left to right of the periodic table. Barium comes after Cesium meaning it has one more electron. More electrons means the strength of electron shielding increases. Therefore, Barium has more electron shielding.
by Andrea- 3J
Wed Oct 24, 2018 10:39 pm
Forum: Trends in The Periodic Table
Topic: Isoeletronic
Replies: 3
Views: 55

Re: Isoeletronic

isoelectronic: having the same number of electrons An atom is neutral, as they contain the same number of protons and electrons. An ion is electronically charged particle. When electrons are added to a neutral atom it becomes a positive ion. When electrons are removed from a neutral atom it becomes ...
by Andrea- 3J
Wed Oct 24, 2018 10:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Q. 1.57
Replies: 2
Views: 78

Re: Q. 1.57

You find the change in energy using :
ΔE= Ef-Ei=-(hR/n^2f)-(-hR/n^2i)

To find the wavelength you use:
λ=E/⋎ and E=h⋎
by Andrea- 3J
Sat Oct 20, 2018 12:05 am
Forum: Quantum Numbers and The H-Atom
Topic: ml Quantum Number
Replies: 4
Views: 70

Re: ml Quantum Number

I don't know if this helps but:

The d orbital has 5 subshells. Which means 5 spots which are: -2, -1, 0, 1, 2



s orbital has 1 subshell ...ml=0
p orbital has 3 subshells...ml=-1,0,1
d orbital has 5 subshells...ml=-2, -1, 0, 1, 2
f orbital has 7 subshells... ml=-3, -2, -1, 0, 1, 2, 3
by Andrea- 3J
Fri Oct 19, 2018 11:54 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Concentration
Replies: 2
Views: 95

Concentration

"Determine the concentration of the solution made by dissolving 660g Ca3(PO4)2 in 2.5L of water." concentration is moles/vol. You must find the moles of Ca3(PO4)2 and then divide it by 2.5L. How do you find moles of Ca3(PO4)2? Ca3(PO4)2 is a complicated compound so I don't understand how t...
by Andrea- 3J
Fri Oct 19, 2018 11:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Combustion Problem
Replies: 1
Views: 88

Combustion Problem

"Salicylic acid is the precursor to the active ingredient in aspirin and was used in history as an early painkiller. It has the formula C7H6O3. If you took a 1.35g pill containing 15% salicylic acid by weight, how many grams of carbon dioxide would you exhale as a result of digesting the salicy...
by Andrea- 3J
Thu Oct 11, 2018 8:26 pm
Forum: Photoelectric Effect
Topic: photoelectric effect
Replies: 2
Views: 57

photoelectric effect

Can someone explain the diagram that Lavelle used for the photoelectric effect? Please include the equations and an example. Thank you:)
by Andrea- 3J
Thu Oct 11, 2018 8:17 pm
Forum: Properties of Light
Topic: spectrum [ENDORSED]
Replies: 2
Views: 42

Re: spectrum [ENDORSED]

The electromagnetic spectrum consists of radiation type, wavelength(m), approximate scale of wavelength, and frequency of radio, microwave, infrared, visible, ultraviolet, x-ray and gamma ray. The absorption spectrum decreases the intensity of radiation at certain wavelengths. It looks like a patter...
by Andrea- 3J
Thu Oct 11, 2018 7:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.21
Replies: 2
Views: 116

G.21

A solution is prepared by dissolving 0.500g of kcl, 0.500g of k2s, and 0.500g of k3po4 in 500.ml of water. What is the concentration in the final solution of (a) potassium ions: (b)sulfide ions? I know that you find concentration by dividing moles by liters. For instance: convert 0.500g of kcl to mo...
by Andrea- 3J
Thu Oct 04, 2018 9:40 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: F 5 Percent Composition
Replies: 4
Views: 32

F 5 Percent Composition

What is the mass percentage composition of l-carnitine, C7H15NO3, a compound that is taken as a dietary supplement to reduce muscle fatigue? I am having trouble fully understanding this problem. The problem does not state which element I need to find the percent composition for. You find mass percen...
by Andrea- 3J
Thu Oct 04, 2018 1:29 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: problem e15 "sulfide of this metal"
Replies: 2
Views: 35

problem e15 "sulfide of this metal"

E15 "The molar mass of the metal hydroxide M(OH)2 is 74.10 g/mol. What is the molar mass of the sulfide of this metal?" I need clarification with this problem. I am assuming M stands for the unknown metal sulfide. So the total molar mass of M(OH)2 which is S(OH)2 is 74.10g/mol. O=16g H=1.0...
by Andrea- 3J
Thu Oct 04, 2018 1:11 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Problem E7 converting atoms to moles
Replies: 4
Views: 40

Problem E7 converting atoms to moles

E7 "A molecule of human DNA was found to contain 2.1x10^9 atoms of carbon. Calculate the chemical amount (in moles) of carbon atoms in the molecule of DNA." Can we submit problems from the sixth edition chemistry textbook? The problem above is asking for atoms to be converted to moles. I j...
by Andrea- 3J
Thu May 24, 2018 10:46 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing power vs polarizability
Replies: 2
Views: 152

Polarizing power vs polarizability

Can someone please explain the difference between polarizing power vs polarizability?

All I know is that cations have higher polarization power and anions have higher polarizability.
by Andrea- 3J
Thu May 24, 2018 10:43 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 3
Views: 152

Re: Polarizing Power

In my notes I wrote: Polarizing power is the cation's ability to pull electrons towards it. The smaller the atom means that there are less electrons and the anion will be closer to the nucleus which will have a stronger pull. I assume that you do need to know polarizing power because it was apart of...
by Andrea- 3J
Thu May 24, 2018 10:38 am
Forum: Bond Lengths & Energies
Topic: Shorter bond length always leads to stronger bond?
Replies: 5
Views: 238

Re: Shorter bond length always leads to stronger bond?

I read in the chemistry textbook that "the higher the bond order, the stronger the pull between the two atoms and the shorter the bond length." This means that the smaller the bond length the stronger the bond is. Small bond length consists of the radii of atom. So generally the smaller in...
by Andrea- 3J
Thu May 24, 2018 10:24 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Confusion on electron configuration
Replies: 1
Views: 92

Confusion on electron configuration

What is the electron configuration for Cu+? Cu has 11 electrons starting from period 4. So the electron configuration for Cu is [Ar]3d104s1. we get rid of the 4d1 because the extra proton. The electron configuration of Cu+ is [Ar]3d10 Can someone briefly explain the process of electron configuration...
by Andrea- 3J
Tue May 22, 2018 9:41 pm
Forum: Lewis Structures
Topic: hwk problem 3.37
Replies: 1
Views: 61

hwk problem 3.37

I need help on homework problem 3.37. The following lewis structure was drawn for a period 3 element. Identify the element." The lewis structure consists of 32 electrons. O has a double bond with an element and 2 lone pair electrons. There are three Cls with 3 lone pairs and one single bond wit...
by Andrea- 3J
Fri May 11, 2018 10:50 am
Forum: Quantum Numbers and The H-Atom
Topic: Midterm Question
Replies: 13
Views: 348

Re: Midterm Question

Just wanted to add on: Principle Quantum Number (n) indicated Valence Shell and it specifies on energy/size. n=1,2,3,4... ****note:as you go down each period in the periodic table Angular Momentum Quantum Number (l) indicates subshell and it specifies on shape. l=0 corresponds to s & it has 1 or...
by Andrea- 3J
Fri May 11, 2018 10:38 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge: Lewis dot structures
Replies: 6
Views: 151

Re: Formal Charge: Lewis dot structures

There's an equation to find formal charge. FC=V-(N+(B/2)) FC=formal charge V=number of Valence electrons N=number of non-bonding valence electrons B=total number of electrons in covalent bonds with other atoms in the molecule Example: the formal charge of Oxygen (O) in Carbon Dioxide (CO2) V=6 N=4 B...
by Andrea- 3J
Tue May 08, 2018 9:54 am
Forum: Trends in The Periodic Table
Topic: Chapter 2, Homework Problem 2.45
Replies: 3
Views: 571

Re: Chapter 2, Homework Problem 2.45

tellurium
by Andrea- 3J
Tue May 01, 2018 11:26 pm
Forum: Molarity, Solutions, Dilutions
Topic: Concentration [ENDORSED]
Replies: 4
Views: 257

Re: Concentration [ENDORSED]

I'm just having trouble starting the problem. Do I convert grams of na2co3 to grams of na in order to find the concentration?
by Andrea- 3J
Tue May 01, 2018 11:24 pm
Forum: Molarity, Solutions, Dilutions
Topic: Concentration
Replies: 4
Views: 168

Re: Concentration

how do i find the moles of ni before the electrodeposition process?
I know the moles of ni after the electrodeposition process is 0.007g ni.
by Andrea- 3J
Tue May 01, 2018 11:14 pm
Forum: Limiting Reactant Calculations
Topic: limiting reactant
Replies: 2
Views: 145

Re: limiting reactant

Thank you for the detailed explanation!
by Andrea- 3J
Tue May 01, 2018 11:12 pm
Forum: Empirical & Molecular Formulas
Topic: empirical formula + mass percentage
Replies: 2
Views: 145

Re: empirical formula + mass percentage

I started out the problem with
co2
C: 69.4g/32.01g=5.78g
h20
h: 17.05g/2.016g=8.457g
Am i going in the right path? if yes what is my next step? if no what am i doing wrong?
by Andrea- 3J
Tue May 01, 2018 11:06 pm
Forum: Balancing Chemical Reactions
Topic: balancing chemical reactions
Replies: 6
Views: 242

Re: balancing chemical reactions

Hi,
I tried it your way but I still got the balancing wrong. With your way the reactants are
Cu:1
H:4
N:4
O:12
while the products are
Cu:1
H:4
N:4
O:10
The oxygens don't match.
by Andrea- 3J
Thu Apr 26, 2018 11:36 pm
Forum: Balancing Chemical Reactions
Topic: balancing chemical reactions
Replies: 6
Views: 242

balancing chemical reactions

_Cu+_HNO3-> _Cu(NO3)2+_NO+_H2O
by Andrea- 3J
Thu Apr 26, 2018 11:34 pm
Forum: Empirical & Molecular Formulas
Topic: empirical formula + mass percentage
Replies: 2
Views: 145

empirical formula + mass percentage

determine the empirical formula for an organic compound that, when burned in the presence of oxygen, formed 69.4 of CO2 and 17.05g of H20. what is the mass percentage of carbon and hydrogen in the sample?
by Andrea- 3J
Thu Apr 26, 2018 11:31 pm
Forum: Limiting Reactant Calculations
Topic: limiting reactant
Replies: 2
Views: 145

limiting reactant

Carbon monoxide can form ozone, which can be toxic at the earth's surface: CO(g)+202(g)->CO2(g)+03(g) A)if a car releases 100.0g of C0 in a garage containing 100.0g of O2, what is the limiting reactant? B) what mass of reactant will be leftover? I attempted this problem but I got it wrong. How do I ...
by Andrea- 3J
Thu Apr 26, 2018 11:23 pm
Forum: Molarity, Solutions, Dilutions
Topic: Concentration
Replies: 4
Views: 168

Concentration

One industrial application of an electrolyte solution is electroplating of metals. In this process, an aqueous solution of metal ions is prepared and electrochemistry can be performed to deposit metal to a desired electrode surface. Suppose one is depositing nickel to an electrode surface and has pr...
by Andrea- 3J
Thu Apr 26, 2018 11:18 pm
Forum: Molarity, Solutions, Dilutions
Topic: Concentration [ENDORSED]
Replies: 4
Views: 257

Concentration [ENDORSED]

Sodium Carbonate, Na2CO3, is a salt which has an important in the manufacture of glass. A solution of sodium carbonate is prepared by dissolving 4.00g of salt to 1.00L water. The above solution is dilluted with 1.00L of 2.00M sodium chloride, NaCl, solution. What is the concentration of sodium ions ...
by Andrea- 3J
Thu Apr 12, 2018 10:48 pm
Forum: Properties of Light
Topic: spectroscopy [ENDORSED]
Replies: 2
Views: 74

spectroscopy [ENDORSED]

Spectroscopy is the analysis of light emitted on desolved by substances used in a spectrometer to analyze light. What is an example for spectroscopy and what do we need it for? I'm just trying to understand how we used this concept in our daily lives.
by Andrea- 3J
Thu Apr 12, 2018 10:45 pm
Forum: SI Units, Unit Conversions
Topic: Volume V Density [ENDORSED]
Replies: 5
Views: 207

Volume V Density [ENDORSED]

Can someone explain the differences between volume and density?
by Andrea- 3J
Thu Apr 12, 2018 10:02 pm
Forum: Properties of Light
Topic: key concept 4/11/18
Replies: 1
Views: 66

key concept 4/11/18

I am having trouble understanding the key concept from Wednesday's lecture.
Equations in Quantum mechanics have variables that are quantized or discrete. Can someone explain this?
by Andrea- 3J
Fri Apr 06, 2018 3:45 pm
Forum: SI Units, Unit Conversions
Topic: Si Unit for molar mass
Replies: 3
Views: 400

Re: Si Unit for molar mass

Remember to always keep the units consistent. I suggest you always convert kilograms to grams. The conversion factor is 1kg=1000g .
by Andrea- 3J
Fri Apr 06, 2018 3:40 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula f.19
Replies: 2
Views: 313

Molecular Formula f.19

F.19
Caffeine, a stimulant in coffee and tea, has a molar mass of 194.19g/mol and a mass percent composition of 49.48%C, 28.85%N, and 16.48%O. What is the molecular formula of caffeine?
Can someone help me by providing a steps to how to do this?
by Andrea- 3J
Fri Apr 06, 2018 3:33 pm
Forum: Balancing Chemical Reactions
Topic: H.15 adding solid, liquid, gas or aqueous to balanced equations [ENDORSED]
Replies: 3
Views: 147

H.15 adding solid, liquid, gas or aqueous to balanced equations [ENDORSED]

H.15 Hydrofluoric acid is used to etch grooves in glass because it reacts with the silica, SiO2(s), in glass. The products of the reaction are aqueous silicon tetrafluoride and water. Write a balanced equation for the reaction. My balanced equation is: 4HF+ SiO2(s)->SiCl4(aq)+2H2o How do I determine...

Go to advanced search