Search found 35 matches
- Sun Nov 24, 2019 10:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4280
Re: Bent vs linear
The bent molecule contains lone pairs, linear does not.
- Sun Nov 24, 2019 10:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: melting point
- Replies: 8
- Views: 644
Re: melting point
The melting point would most likely decrease.
- Sun Nov 24, 2019 10:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hydrogen Bonding
- Replies: 13
- Views: 717
Re: Hydrogen Bonding
Typically, yes, because the hydrogen is attracted to atoms N, O, and F, that have stronger partial negative charges.
- Sun Nov 24, 2019 10:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hybridization
- Replies: 7
- Views: 456
Re: Hybridization
It is when an atom uses both its s and p orbitals to bond, in cases where the number of bonds exceeds the number available in the unhybridized state.
- Sun Nov 24, 2019 10:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AXE Format
- Replies: 34
- Views: 1250
Re: AXE Format
You can just write one X or E- it's like writing X in an equation.
- Sun Nov 10, 2019 8:48 pm
- Forum: Lewis Structures
- Topic: Radicals
- Replies: 2
- Views: 187
Re: Radicals
Since oxygen has greater electronegativity, it will attract the lone electron.
- Sun Nov 10, 2019 8:46 pm
- Forum: Lewis Structures
- Topic: Lewis structure
- Replies: 5
- Views: 235
Re: Lewis structure
The phosphorus in the center is less electronegative than oxygen so it wouldn't make sense for it to attract such a large negative charge. Additionally, it is less stable in general for any one element in the structure to have such a large charge.
- Sun Nov 10, 2019 8:44 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 18
- Views: 694
Re: Drawing Lewis Structures
They should not always have a formal charge of zero. Instead, the formal charges should equal to the overall charge of what you are drawing.
- Sun Nov 10, 2019 8:42 pm
- Forum: Lewis Structures
- Topic: Formal Charges
- Replies: 15
- Views: 965
Re: Formal Charges
Since the central atom is typically the least electronegative, it probably should not have a negative charge. I think that, in general, it is best for the central atom not to have a formal charge.
- Sun Nov 10, 2019 8:41 pm
- Forum: Lewis Structures
- Topic: Electronegative
- Replies: 14
- Views: 850
Re: Electronegative
Yes, elements with stronger electronegativity are more likely to attract electrons.
- Sun Nov 03, 2019 10:59 pm
- Forum: Lewis Structures
- Topic: central atom
- Replies: 16
- Views: 2230
Re: central atom
The atom in the center should be the one with the least electronegativity.
- Sun Nov 03, 2019 10:58 pm
- Forum: Lewis Structures
- Topic: formal charge
- Replies: 6
- Views: 285
Re: formal charge
I don't think it is necessarily required, but it does help ensure that you draw the most stable compound.
- Sun Nov 03, 2019 10:57 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 3
- Views: 222
Re: Lewis Structure
Yes, you do.
- Sun Nov 03, 2019 10:56 pm
- Forum: Lewis Structures
- Topic: Lone Pairs
- Replies: 12
- Views: 596
Re: Lone Pairs
You figure out the number of pairs not included in one of the bonds.
- Sun Nov 03, 2019 10:54 pm
- Forum: Lewis Structures
- Topic: Drawing lewis structures
- Replies: 5
- Views: 226
Re: Drawing lewis structures
When drawing Lewis structures, I think you should try to draw the one with the lowest formal charge possible.
- Sun Oct 27, 2019 8:55 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2.A.17
- Replies: 3
- Views: 167
Re: 2.A.17
When it is positive, that means they lost electrons, so you look at their valence number and subtract the amount of the charge.
- Sun Oct 27, 2019 8:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: Valence Electrons
- Replies: 16
- Views: 769
Re: Valence Electrons
You can look at the group number to figure this out.
- Sun Oct 27, 2019 8:51 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 14
- Views: 1084
Re: Covalent Bonds
Yes, it is only between nonmetals!
- Sun Oct 27, 2019 8:49 pm
- Forum: Ionic & Covalent Bonds
- Topic: Metalloids
- Replies: 5
- Views: 223
Re: Metalloids
They can do either!
- Sun Oct 27, 2019 8:41 pm
- Forum: Ionic & Covalent Bonds
- Topic: Metals Vs. Nonmetals
- Replies: 8
- Views: 612
Re: Metals Vs. Nonmetals
Metals tend to form cations, while nonmetals form anions. This is because metals typically lose from their valence shells in order to obtain a full outer shell because it would require more energy to gain them.
- Sun Oct 20, 2019 11:04 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity
- Replies: 5
- Views: 339
Re: Electron affinity
Electron affinity is essentially how attracted an atom is to an electron. It is highest toward the upper right part of the periodic table with the exception of the noble gases because their shells are already filled.
- Sun Oct 20, 2019 10:56 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 16
- Views: 951
Re: Atomic Radius
I think you can only do it when they are in the ground state!
- Sun Oct 20, 2019 6:18 pm
- Forum: Properties of Light
- Topic: homework 1A.3
- Replies: 8
- Views: 293
Re: homework 1A.3
When frequency decreases, wavelength increases because the two have an inverse relationship.
- Sun Oct 20, 2019 6:14 pm
- Forum: Properties of Light
- Topic: What are the units of hertz
- Replies: 41
- Views: 2121
Re: What are the units of hertz
Hertz can also be expressed as s^-1, which means one cycle per second
- Sun Oct 20, 2019 6:13 pm
- Forum: Properties of Light
- Topic: Unit for Wavelength
- Replies: 34
- Views: 2481
Re: Unit for Wavelength
Wavelength is a measure of distance, so it will typically be in some variation of meters (nanometers, picometers, etc.).
- Sun Oct 13, 2019 9:29 pm
- Forum: SI Units, Unit Conversions
- Topic: Calculate using kg or g?
- Replies: 13
- Views: 893
Re: Calculate using kg or g?
I think that leaving the answer in grams is okay, but it might depend on the question being asked.
- Sun Oct 13, 2019 9:27 pm
- Forum: SI Units, Unit Conversions
- Topic: Molar Ratio
- Replies: 4
- Views: 1360
Re: Molar Ratio
Molar ratios express the proportion of moles between elements in a reaction. To find the molar ratio, you would balance an equation and then look at the coeffecients.
- Sun Oct 13, 2019 9:24 pm
- Forum: SI Units, Unit Conversions
- Topic: Angstrom
- Replies: 16
- Views: 886
Re: Angstrom
Angstroms are used to measure bond length and are expressed as 1*10^-10m
- Sun Oct 13, 2019 9:23 pm
- Forum: SI Units, Unit Conversions
- Topic: Accuracy vs Precision
- Replies: 11
- Views: 788
Re: Accuracy vs Precision
Accuracy cares about how close a measurement taken is to some accepted, agreed upon value. Precision, however, refers to how reproducible a measurement is (in other words, when measuring something, do you get around the same value each time). Precision does not care about an accepted value for the i...
- Sun Oct 13, 2019 9:20 pm
- Forum: SI Units, Unit Conversions
- Topic: Conversion
- Replies: 6
- Views: 581
Re: Conversion
These measure different things. A joule measures work, and can have the units of a Newton meter, while a meter just measures length.
- Sun Oct 06, 2019 8:18 pm
- Forum: Significant Figures
- Topic: Number of significant figures
- Replies: 5
- Views: 422
Re: Number of significant figures
The number of significant figures used depends on the numbers present in the given problem. Sig figs rely on the number given in the problem with the lowest number of significant figures.
- Sun Oct 06, 2019 8:16 pm
- Forum: Balancing Chemical Reactions
- Topic: Alternative to Guess and Check?
- Replies: 5
- Views: 260
Re: Alternative to Guess and Check?
I usually find that starting with the element that occurs the least on both sides works best. For example, if carbon was only in one place on both sides, I would start with that. This helps prevent some of the guessing and checking as you can usually build up to some of the reoccurring elements.
- Sun Oct 06, 2019 8:03 pm
- Forum: Limiting Reactant Calculations
- Topic: Percent or theoretical yield
- Replies: 14
- Views: 1291
Re: Percent or theoretical yield
Percent yield involves both the actual and theoretical yield (the formula is actual/theoretical x100). The theoretical yield assumes that everything in the reaction occurred in perfect conditions, which is not the case in practice. Therefore, the percent yield shows the difference.
- Sun Oct 06, 2019 8:01 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Theoretical Yield
- Replies: 9
- Views: 408
Re: Calculating Theoretical Yield
Once you find your limiting reactant, you use the number of moles of that reactant that are present, because the limiting reactant is what dictates the amount ultimately produced through the reaction. This is how you find out what the theoretical yield should be, and you can then compare that to the...
- Sun Oct 06, 2019 7:57 pm
- Forum: Limiting Reactant Calculations
- Topic: limiting reactant
- Replies: 9
- Views: 582
Re: limiting reactant
The limiting reactant is not necessarily always the one with the smallest number of moles. To determine which reactant is limiting, you have to compare the moles of each reactant to the ratios in the balanced chemical equation.