Search found 31 matches

by skim313
Sat Nov 16, 2019 10:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs. Nonpolar
Replies: 12
Views: 46

Re: Polar vs. Nonpolar

You need to draw the lewis structure and it helps to draw arrows to the negative charged atom from the positively charged ion. If there are two different poles, then the molecule is polar, if both cancel out, it is nonpolar.
by skim313
Sat Nov 16, 2019 10:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E 11 b)
Replies: 4
Views: 11

Re: 2E 11 b)

Chlorine cannot have more than a single bond so we know that there are 3 single bonds on iodine, meaning there will be two left over lone pairs on iodine.
by skim313
Sat Nov 16, 2019 9:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar or non polar?
Replies: 7
Views: 29

Re: polar or non polar?

You need both to figure out if it is polar/nonpolar. Electronegativity will tell where the pull of electrons is, but the Lewis structure shows the positioning of the atoms and whether they will cancel or not.
by skim313
Sun Nov 10, 2019 9:03 pm
Forum: Electronegativity
Topic: Karen's worksheet #12
Replies: 3
Views: 46

Re: Karen's worksheet #12

There is a greater difference in electronegativity.
by skim313
Sun Nov 10, 2019 8:58 pm
Forum: Electronegativity
Topic: ionic character
Replies: 7
Views: 28

Re: ionic character

Ionic character, I believe, is a covalently bond that has such strong ionic character (electronegativity) that a covalently bonded substance is almost ionic.
by skim313
Sun Nov 10, 2019 8:57 pm
Forum: Electronegativity
Topic: Ionic or covalent?
Replies: 17
Views: 99

Re: Ionic or covalent?

An ionic bond is typically comprised of a non metal and a metal while a covalent bond is usually two non metals.
by skim313
Sun Nov 10, 2019 8:56 pm
Forum: Electronegativity
Topic: memorizing tables
Replies: 9
Views: 39

Re: memorizing tables

Just know the general trend on the periodic table.
by skim313
Sun Nov 10, 2019 8:56 pm
Forum: Electronegativity
Topic: Ionization Energy vs. Electronegativity
Replies: 9
Views: 30

Re: Ionization Energy vs. Electronegativity

Both ionization energy and electronegativity increase toward the upper right hand side of the periodic table.
by skim313
Sun Nov 10, 2019 8:54 pm
Forum: Electronegativity
Topic: Electron Affinity and Electronegativity
Replies: 7
Views: 18

Re: Electron Affinity and Electronegativity

Electron affinity is the energy released when an electron in added to to an atom, while electronegativity is how much an atom pulls electrons.
by skim313
Sun Nov 10, 2019 8:49 pm
Forum: Octet Exceptions
Topic: Incomplete octets
Replies: 3
Views: 15

Re: Incomplete octets

Hydrogen, helium, and boron are all exceptions to the rule.
by skim313
Wed Oct 30, 2019 9:04 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 10
Views: 38

Re: Lone Pairs

Lone pair electrons are electrons that are not bonded to other elements. In other words, they are not shared with any other elements.
by skim313
Wed Oct 30, 2019 9:03 pm
Forum: Lewis Structures
Topic: Exceptions to the Octet Rule
Replies: 3
Views: 20

Re: Exceptions to the Octet Rule

Elements P, Cl, and S do not adhere to the octet rule because of the d orbital.
by skim313
Wed Oct 30, 2019 9:01 pm
Forum: Lewis Structures
Topic: Creating Lewis Structures
Replies: 7
Views: 47

Re: Creating Lewis Structures

Typically, the element with the lowest ionization energy will go in the center.
by skim313
Wed Oct 30, 2019 8:59 pm
Forum: Lewis Structures
Topic: Valence electrons
Replies: 5
Views: 41

Re: Valence electrons

Sulfur, Phosphorous, and Chlorine all deviate from the octet rule because they have the extra d orbitals.
by skim313
Wed Oct 30, 2019 8:58 pm
Forum: Lewis Structures
Topic: Drawing lewis structures
Replies: 8
Views: 41

Re: Drawing lewis structures

If the question asks for Lewis structures, I assume it is just the 2D model without angles. I'm sure if we learn about bond angles there will be a separate question.
by skim313
Sun Oct 20, 2019 11:48 pm
Forum: Properties of Light
Topic: Speed of light
Replies: 13
Views: 70

Re: Speed of light

Typically, if not mentioned, you use the speed of light in a vacuum.
by skim313
Sun Oct 20, 2019 11:39 pm
Forum: Properties of Light
Topic: Combining Different Equations
Replies: 8
Views: 51

Re: Combining Different Equations

Sometimes you are given some info but not others, so in order to solve with the info given you can rearrange them to fit the info you have.
by skim313
Sun Oct 20, 2019 11:36 pm
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 67

Re: Constant for Speed of Light

For tests at least, I used the constant given on the front sheet and I got full points for the problem.
by skim313
Sun Oct 20, 2019 11:35 pm
Forum: Properties of Light
Topic: Unit Conversions
Replies: 6
Views: 49

Re: Unit Conversions

I find it easier to convert when you first convert to meters, then to the needed measurement from there.
by skim313
Sun Oct 20, 2019 11:33 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 211

Re: What are the units of hertz

The unit is 1/s which is essentially s^-1
by skim313
Sun Oct 20, 2019 11:32 pm
Forum: Properties of Electrons
Topic: Angstrom Conversion
Replies: 12
Views: 89

Re: Angstrom Conversion

1 Angstrom is equal to 10^-10 meters
by skim313
Fri Oct 11, 2019 4:04 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 773

Re: Speed of Light

3.00 x 10^8 is the speed of light inside a vacuum.
by skim313
Fri Oct 11, 2019 4:03 pm
Forum: Properties of Light
Topic: Frequency and Hertz
Replies: 5
Views: 43

Re: Frequency and Hertz

The unit is simply second^-1 or 1/s.
by skim313
Fri Oct 11, 2019 3:58 pm
Forum: Properties of Light
Topic: Relationship between lambda and nu
Replies: 5
Views: 56

Re: Relationship between lambda and nu

Based on the equation for the speed of light, c = λ ν, c is a constant, so λ and ν are inversely proportional because they are being multiplied. As one goes up, the other value must go down, and vice versa. For example, if λ, the wavelength goes up in value, the frequency, ν, must respond accordingl...
by skim313
Fri Oct 11, 2019 3:55 pm
Forum: Properties of Light
Topic: Clarification on Frequency
Replies: 8
Views: 74

Re: Clarification on Frequency

Since C=λν, frequency and wavelength are inversely proportional, meaning that as one increases, the other decreases since the speed of light, c, is constant. By decreasing the wavelength, you can increase the frequency.
by skim313
Fri Oct 11, 2019 3:53 pm
Forum: Properties of Light
Topic: Converting units
Replies: 8
Views: 33

Re: Converting units

400nm (1m / 10^9nm) (1 A / 10^-10m) = 4000 A
by skim313
Sat Oct 05, 2019 7:51 pm
Forum: Significant Figures
Topic: Sig Figs in Mulitstep Problems
Replies: 10
Views: 65

Re: Sig Figs in Mulitstep Problems

Personally, I have a calculator that keeps track of all the problems I did previously (TI-84), so what I do is when I am doing work on paper, I will write the answer (throughout the problem not the final answer) with the amount of sig figs that are called for, but when I am calculating the next port...
by skim313
Sat Oct 05, 2019 7:42 pm
Forum: Balancing Chemical Reactions
Topic: Strategies for Balancing Chemical Equations
Replies: 12
Views: 64

Re: Strategies for Balancing Chemical Equations

It might also help to examine the full equation and start with the elemnts or molecules taht appear the least amount of times on each side and work your way up. I agree that this is one of the easiest ways for me to balance equations. Professor Lavelle did also mention this method as his way of bal...
by skim313
Sat Oct 05, 2019 7:40 pm
Forum: Balancing Chemical Reactions
Topic: When are atoms lost or created?
Replies: 14
Views: 134

Re: When are atoms lost or created?

Atoms cannot be created or destroyed according to the Law of Conservation in chemical reactions, but Professor Lavelle did mention that in the future we will learn about a different type of reaction where atoms can be created of destroyed.
by skim313
Sat Oct 05, 2019 7:36 pm
Forum: Limiting Reactant Calculations
Topic: Order of atoms in molecules
Replies: 6
Views: 50

Re: Order of atoms in molecules

Like most people said already, the order is not very important, but there is a method called the Hill System that states that Carbon atoms are listed first, then Hydrogen, and the rest of the atoms alphabetically.
by skim313
Sat Oct 05, 2019 7:30 pm
Forum: Limiting Reactant Calculations
Topic: Percent or theoretical yield
Replies: 14
Views: 98

Re: Percent or theoretical yield

Theoretical yield is the calculated amount of yield you get when you plug in values into an equation. Percent yield, however, is the percentage of how much actual yield is produced out of the theoretical yield. Factors that inhibit reactions from producing 100% yield occur because of loss of product...

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