Search found 24 matches
- Sun May 27, 2018 5:47 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid deposition
- Replies: 2
- Views: 961
Acid deposition
How is acid deposition formed?
- Sun May 27, 2018 5:46 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Ionisation [ENDORSED]
- Replies: 2
- Views: 699
Ionisation [ENDORSED]
How do strong and weak acids differ in the extent of ionisation?
- Sun May 27, 2018 5:38 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Conjugate acid-base pair
- Replies: 1
- Views: 492
Conjugate acid-base pair
How do you find whether a pair of species are an acid-base pair?
- Fri May 18, 2018 1:15 am
- Forum: Ionic & Covalent Bonds
- Topic: Allotropes
- Replies: 1
- Views: 288
Allotropes
Do we need to know the giant structure examples of covalent and ionic bonding (ie. graphite and diamond)?
- Fri May 18, 2018 1:14 am
- Forum: Ionic & Covalent Bonds
- Topic: Melting and Boiling Points
- Replies: 3
- Views: 498
Melting and Boiling Points
What are the differences in the melting and boiling points of ionic and covalent bonds?
- Fri May 18, 2018 1:13 am
- Forum: Ionic & Covalent Bonds
- Topic: Solubility
- Replies: 3
- Views: 479
Solubility
Are covalent bonds usually soluble or insoluble in water?
- Sat May 12, 2018 12:38 pm
- Forum: Octet Exceptions
- Topic: Octet fule in forming compounds
- Replies: 2
- Views: 452
Octet fule in forming compounds
How does calcium obey the octet rule when reacting to form compounds?
- Sat May 12, 2018 12:34 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge of ClO2- [ENDORSED]
- Replies: 4
- Views: 3205
Formal charge of ClO2- [ENDORSED]
Is the compound drawn as Cl-O-O or O-Cl-O?
- Sat May 12, 2018 12:31 pm
- Forum: Resonance Structures
- Topic: Resonance structure of benzene
- Replies: 4
- Views: 663
Resonance structure of benzene
What is the resonance structure of benzene (the aromatic ring compound)?
- Sun May 06, 2018 3:47 pm
- Forum: Properties of Light
- Topic: The visible spectrum
- Replies: 4
- Views: 732
The visible spectrum
What is the difference between the continuous spectrum and the line spectrum?
- Sun May 06, 2018 3:42 pm
- Forum: Trends in The Periodic Table
- Topic: Ionisation energy
- Replies: 1
- Views: 348
Ionisation energy
How does ionisation energy change down and across the periodic table?
- Sun May 06, 2018 3:36 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Shapes of orbitals
- Replies: 6
- Views: 780
Shapes of orbitals
Will we need to know the shapes of the different orbitals? ie how p is a dumbbell shape or s is spherically shaped?
- Tue Apr 24, 2018 10:01 pm
- Forum: Properties of Light
- Topic: test 2
- Replies: 18
- Views: 1650
Re: test 2
I think the questions will be similar to those we did in class discussions.
- Tue Apr 24, 2018 9:54 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Order of Orbitals
- Replies: 10
- Views: 2596
Re: Order of Orbitals
The orbitals are differentiated in terms of their relative energy, s having the lowest and f having the highest (s<p<d<f).
- Tue Apr 24, 2018 9:52 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Special Orbitals
- Replies: 2
- Views: 364
Re: Special Orbitals
I think there are two anomalous configurations when an element fills the orbital 'abnormal': chromium and copper which do not seem to fit the pattern. Chromium is energetically more stable to have 3d5 then pair up the 4s orbital ((Ar)4s1 3d5). Copper has extra stability due to a full set of 3d orbit...
- Wed Apr 18, 2018 1:11 pm
- Forum: Properties of Electrons
- Topic: electron mass
- Replies: 15
- Views: 1673
Re: electron mass
Electrons have a mass but in comparison to protons and neutrons in an atom, they will not affect the total mass I think.
- Wed Apr 18, 2018 1:01 pm
- Forum: Properties of Light
- Topic: Rydberg equation
- Replies: 2
- Views: 419
Re: Rydberg equation
The Rydberg Equation is used to find the wavelengths of all the spectral lines in the emission spectrum of hydrogen, for example the wavelength of light which moves between n=2 and n=4.
- Wed Apr 18, 2018 12:58 pm
- Forum: Properties of Light
- Topic: Series Question
- Replies: 3
- Views: 478
Re: Series Question
We looked at the Hydrogen spectral series which accounts for the transition of electrons between different energy levels in an atom. The hydrogen spectrum consists of a series of lines of different colours (violet, blue, green and red) in the visible region of the spectrum. The Lyman series correspo...
- Thu Apr 12, 2018 10:57 pm
- Forum: SI Units, Unit Conversions
- Topic: Temperature
- Replies: 5
- Views: 751
Re: Temperature
The most common form of measurement is Celsius, Kelvin is almost used in relation with celsius as it is an absolute scale meaning that it indicates the temperature at which molecules stop moving (0K = absolute zero).
- Thu Apr 12, 2018 10:53 pm
- Forum: SI Units, Unit Conversions
- Topic: writing out conversions in one long line vs. steps
- Replies: 16
- Views: 1479
Re: writing out conversions in one long line vs. steps
I find it easier to break the problem in multiple steps as it reduces any room for error and makes it easier to understand the question.
- Thu Apr 12, 2018 10:51 pm
- Forum: SI Units, Unit Conversions
- Topic: Volume V Density [ENDORSED]
- Replies: 5
- Views: 941
Re: Volume V Density [ENDORSED]
Volume is the amount of space a substance takes up. On the other hand, the density is the mass of an object divided by the object's volume.
- Sun Apr 08, 2018 10:34 am
- Forum: SI Units, Unit Conversions
- Topic: Units + their meanings
- Replies: 3
- Views: 446
Re: Units + their meanings
Also if it helps, g/mol = mass (in grams) / number of moles (mol) - lending itself to the correct units of the molar mass
- Sun Apr 08, 2018 10:31 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 444479
Re: Rusty on High School Chem [ENDORSED]
Usually with chem practicing a variety of questions on the topic is very useful - so I would recommend doing extra questions in the text book.
- Sun Apr 08, 2018 10:30 am
- Forum: Balancing Chemical Reactions
- Topic: Balancing equations with fractions [ENDORSED]
- Replies: 13
- Views: 1643
Re: Balancing equations with fractions [ENDORSED]
Also it is easier to use whole numbers as it would be simpler to decipher the mole ratio between reactants and products.