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Which properties of a gas increase linearly as the temperature is increased?

A. Volume and density
B. Volume and pressure
C. Amount of gas and density
D. Amount of gas and volume
I believe the answer is A or D But I am pretty sure the answer is a

No. Look at the P vs V plot at that same site. It certainly is not linear. Do you know what linear means?

See the V vs T graph.

https://www.google.com/search?q=graph+volume+gas+vs+T&ie=utf-8&oe=utf-8

is the answer B?

after looking at graphs I know believe the answer is D. What do you think?

What does linear mean?

it goes in the same directions. If temperature increase then the other properties have to increase

I think you have defined "directly proportional" which is the opposite of "inversely proportional". Here is the definition of linear from the web.

https://www.google.com/search?q=define%3Alinear&ie=utf-8&oe=utf-8
Notice it talks of a straight line. You had the right answer when you started. I simply posted that V vs T plot to show you it was a straight line. The P vs V plot is a curved line. Go back and look at those graphs. The V vs T is straight, V vs P is curved, and the other choices make no sense anyway.

I am so confused. All the answers make no sense. I know the answer has to be A,B or D because of the volume but which one do I choose? A?

It turns out you were wrong; The true answer is B.

You're right. I didn't read the question thoroughly enough. The secret word in the problem is increase. And when T increases the density decreases because the volume increases. density = mass/volume so when volume goes up density goes down. As for B, I looked up the graphs BUT chose P vs V and not V vs T and P vs T so I wasn't even on the right page. Thank you for sharing.

Probably I should have said I didn't read the question "carefully enough". But thoroughly fits in there somewhere.

I told you above it was a. a is the only one that gives you a straight line on the graph. All you had to do was look at the graph and see which gives a straight line. A straight line is the only way you can get a linear relationship (if you plot directly and not log or something like that). If you didn't know that before reading this last response from me then you aren't connecting the dots.