[Cute-Bunny]

A substance is found to have a density of 2.40 g mL-1 and weighs 100 g. What is its volume in mL?
 

[Cute-Bunny]

Which of the following numbers can be added directly in exponential notation?


1. 3x10^-4

2. 600x 10

3. 32.6x10^-3

4. 0.4x10^-4

[Cute-Bunny]

A density of 1.5 g cm-3 is equivalent to:

a. 1500 g L-1

b. 150 g L-1

c. 1.5x10^-3 kg L-1

d. 15 g L-1

 

[Cute-Bunny]

The density of a substance___________as the temperature increases

please answer 

[Arkcon]

Please read the Forum Rules, posted in Red at the top of every forum page.  We like to help, but we don't give complete answers to homework problems.  Make some sort of attempt to solve the questions you've asked, and we'll see where you may be stuck, and we'll offer help.  For everyone's convenience, I've merged your various postings into one thread, they seem to all cover the same general topic -- except for one, but we can work on that at the same time, you'll need the answer for all of your other work, anyway.

[Cute-Bunny]

Please read the Forum Rules, posted in Red at the top of every forum page.  We like to help, but we don't give complete answers to homework problems.  Make some sort of attempt to solve the questions you've asked, and we'll see where you may be stuck, and we'll offer help.  For everyone's convenience, I've merged your various postings into one thread, they seem to all cover the same general topic -- except for one, but we can work on that at the same time, you'll need the answer for all of your other work, anyway.

ok but this is not homework lool im a university student and i found these on a book but there where no answers only questions were there so thats why im asking 

[Arkcon]

Oh ... kay.  You've found these problems in a book, so you should have access to the rest of the chapter.  For example, can you find the definition of the term density?  And the formula for calculating it?  Once you have that, you can solve the first question for yourself.

[dazza95]

Density=mass/volume

[XGen]

How would you use this formula, density = mass/volume, to find the volume of a substance given density and mass? Hint, you have two of the three variables in that equation.

[Arkcon]

Thanks for trying to be helpful, dazza95: and XGen:, but if you quickly check the profile of Cute-Bunny:, right here:  http://www.chemicalforums.com/index.php?action=profile;u=128098  you can see they haven't logged on at all since the day after their postings.  Maybe we can wait until some work on their part is actually posted.  We have dozens of other threads on density and significant figures, if a third party wants to browse our forums for help.

[Borek]

CB posted exactly the same questions at PF and got help there as well.