Search found 13 matches

by Grace_Bower_2B
Wed Mar 15, 2017 2:04 pm
Forum: *Alkanes
Topic: Non-Hydrocarbon Substituants
Replies: 1
Views: 352

Non-Hydrocarbon Substituants

How are you supposed IUPEC name hydrocarbons with substituents like bromine and chloride? Is it the number and then just bromo or chloro?
by Grace_Bower_2B
Wed Mar 15, 2017 2:02 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Homework question
Replies: 2
Views: 270

Re: Homework question

Why did you think the methyl group had higher priority than the ethyl group? Z (cis) and E (trans) are determined base on the location of the highest priority substituent on either side. To determine priority you look at the atomic number of the molecular attached to the central carbon. In the case ...
by Grace_Bower_2B
Wed Mar 15, 2017 1:23 pm
Forum: *Alkanes
Topic: Naming from Line Structure
Replies: 2
Views: 209

Re: Naming from Line Structure

You're right the number in front of the methyl is the number of the carbon it's attached too. How you find that number is that you assign it, making sure that you are using the lowest numbers. Look at this example (a cyclic molecule with two methyl groups you described. http://www.chemspider.com/Ima...
by Grace_Bower_2B
Wed Mar 15, 2017 1:12 pm
Forum: *Alkanes
Topic: 1.16 Ch.1 Organic Textbook Question
Replies: 2
Views: 265

Re: 1.16 Ch.1 Organic Textbook Question

The trick is if the prefix is number based you ignore it. Otherwise, it counts for alphabetical.
by Grace_Bower_2B
Mon Feb 27, 2017 11:27 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Equations for activation energy
Replies: 1
Views: 169

Re: Equations for activation energy

The significance of pointing out the difference between the two is it's sometimes useful to have the linear equation. It makes it easy to see how temperature affects the reaction constant K from an equation or a plot. If you were given a plot of the non-linear Arrhenius equation it would be a lot mo...
by Grace_Bower_2B
Mon Feb 13, 2017 3:36 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Probability of higher order reactions
Replies: 1
Views: 227

Re: Probability of higher order reactions

Increasing the temperature and the pressure will increase the kinetic energy of the molecules, which will increase the number of collisions happening over a certain period of time. As the overall number of collisions increases, the number of rare collisions (tetra or trimolecular) will also increase...
by Grace_Bower_2B
Sun Feb 05, 2017 11:36 pm
Forum: Balancing Redox Reactions
Topic: Oxygen Ion Charge
Replies: 3
Views: 546

Re: Oxygen Ion Charge

Do you have the rules written out somewhere, because I'm not sure what you're talking about? Oxygen almost always has an oxidation state of -2 (like you would expect from its position in the periodic table and it's electron configuration). There are certain compounds that cause oxygen to have a -1 c...
by Grace_Bower_2B
Sun Feb 05, 2017 11:28 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 3
Views: 383

Re: Sig Figs

If those are the only data points you are given, yes. Otherwise use the least precise measurement not counting measurements that have to be made in whole numbers.
by Grace_Bower_2B
Sun Feb 05, 2017 11:25 pm
Forum: Environment, Fossil Fuels, Alternative Fuels
Topic: Concept of "Cold"
Replies: 4
Views: 701

Re: Concept of "Cold"

First of all, consider the ice the 'system' and the coffee the 'surroundings'. The melting of the ice is an endothermic reaction, it requires heat to occur, so the q of the system increases. According to the first law of thermodynamics, the q of the system = —q of the surroundings, so if the q of th...
by Grace_Bower_2B
Thu Jan 19, 2017 10:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.57
Replies: 2
Views: 350

Re: HW 8.57

You're overcomplicating it. Hydrogenation just means adding hydrogen, this case adding hydrogen to ethyne to turn it into ethane. It's not telling you that you have to do something to the equation, just naming the reaction occurring (like combustion)
by Grace_Bower_2B
Thu Jan 19, 2017 10:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Help on Problem 8.99 [ENDORSED]
Replies: 4
Views: 650

Re: Help on Problem 8.99 [ENDORSED]

The simple answer is that I literally just went to the back of the book to the table of enthalpies and the given enthalpy for Zn was zero. The actual answer goes back to the idea of standard states. If you look on page 17 of the course reader it explains that the standard enthalpy of an element in i...
by Grace_Bower_2B
Thu Jan 19, 2017 7:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Help on Problem 8.99 [ENDORSED]
Replies: 4
Views: 650

Re: Help on Problem 8.99 [ENDORSED]

The first thing you need to do is setup the equation so you can calculate the enthalpy of the reaction, which is mixing sold zinc and hydrochloric acid. 2HCl (aq) + Zn (s) --> H 2 (g) + ZnCl 2 or 2H + (aq) + 2Cl - (aq) + Zn (s) --> H 2 (g) + 2Cl - (aq) + Zn 2+ (aq) which simplfies to 2H + (aq) + Zn ...
by Grace_Bower_2B
Tue Jan 17, 2017 5:35 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess' Law [ENDORSED]
Replies: 5
Views: 640

Hess' Law [ENDORSED]

I don't understand why balancing one of the component equations used when solving Hess's Law you don't have to change the enthalpy. For example, in 8.55, one of the component equations is 2Al(s) + O 2 (g) --> Al 2 O 3 (g) which needs to balanced by multiplying O 2 by two-thirds. Normally when we mak...

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