## Search found 111 matches

Sat Oct 12, 2019 10:22 pm
Forum: Balancing Chemical Reactions
Topic: F.3
Replies: 5
Views: 209

### F.3

F.3 a) Write the formula for nitric acid. b) Without doing a calculation, estimate which element in nitric acid occurs with the greatest mass percentage.

Are we expected to be able to derive the formula for nitric acid and other compounds on our own?
Sun Oct 06, 2019 9:51 pm
Forum: Balancing Chemical Reactions
Topic: Understanding how to get whole #s [ENDORSED]
Replies: 18
Views: 259

### Re: Understanding how to get whole #s[ENDORSED]

Once you have calculated the moles of each element, you should first divide by the smallest number. If you still don't have integers for your answers, start multiplying through the numbers until you have whole integers.
Sun Oct 06, 2019 9:45 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Word Problem Efficiency
Replies: 7
Views: 250

### Re: Word Problem Efficiency

I have the same problem.. I have no problem solving the problems that are laid out simply, but spend most of my time trying to break down the word problems. Ive tried circling quantities to try to simplify the paragraphs, but it doesn't help too much. If anyone has any other methods for breaking dow...
Sun Oct 06, 2019 9:28 pm
Forum: Balancing Chemical Reactions
Topic: Alternative to Guess and Check?
Replies: 5
Views: 74

### Re: Alternative to Guess and Check?

I usually start balancing equations with the element that occurs alone on either side of the equation. In this example's case, it would be Sulfur. By balancing the isolated element, you can then focus on the more complicated elements and mixed compounds. It usually does include some guessing and che...
Sun Oct 06, 2019 9:05 pm
Forum: Significant Figures
Topic: When do zeros count?
Replies: 5
Views: 87

### Re: When do zeros count?

Why is it that 3000 only has one sig fig, but 3000. has four? What is the significance of the decimal when there are no figures following it?
Sun Oct 06, 2019 9:02 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 4002

### Re: Showing Work for Limiting Reactant Calculations on Tests[ENDORSED]

Do we need to show our work on tests to show how we calculated the correct number of sig figs? Or is our final answer the only thing we are graded on?
Sun Sep 29, 2019 4:46 pm
Forum: Molarity, Solutions, Dilutions
Topic: Finding the volume of stock solution to dilute
Replies: 13
Views: 791

### Re: Finding the volume of stock solution to dilute

I'd recommend converting to L before you start your calculations, because the formula for finding molarity is [moles of solute (M)]/[volume of solution (L)]. Either way, you'll have to convert to L before finalizing your answer.
Sun Sep 29, 2019 4:41 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations
Replies: 5
Views: 718

### Re: Balancing Equations

Since all reactants and products are in the gaseous form, the problem is simply asking what the net change in total moles is. So, since the reactants amount to 30 moles of gas, and the products amount to 36 moles of gas, your net number of moles produced is 6. Don't forget to balance the reaction fi...
Sun Sep 29, 2019 4:32 pm
Forum: Limiting Reactant Calculations
Topic: Finding limiting reagent
Replies: 6
Views: 401

### Re: Finding limiting reagent

You also need to take into account the ratio of the reactants to each other. For example, if the ratio of two reactants, CO2 and H2O, is anything besides 1:1, you need to determine how much product will be produced by each quantity of reactants, then determine which one is limiting.
Sun Sep 29, 2019 4:22 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 1119

### Re: Balancing Equations[ENDORSED]

How are we supposed to know what number to multiply by in order to attain whole integers? Knowing if we need to multiply by 2 or 3 to reach a whole number is easy, but what about when the solution is more complicated?
Sun Sep 29, 2019 4:13 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 203
Views: 141364

### Re: Rusty on High School Chem[ENDORSED]

I'm in a similar place - I took a Chemistry course the summer after my sophomore year in high school and I am now a second year. Luckily, Dr. Lavelle is starting this course with a week focused on reviewing high school chemistry topics, and I've heard he's a great teacher. Past that, I think the bes...

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