Test 1: Sig Figs

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

nehashetty_2G
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Joined: Thu Jul 25, 2019 12:15 am

Test 1: Sig Figs

Do sig figs count on the test 1? If so, how do sig figs work with pH and decimals points. For example, if pH = 5.1 and the question asks for the [H+], how many sig figs would the [H+] have?

Wendy 1E
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Re: Test 1: Sig Figs

I am not sure if they count, but I would suggest knowing how they work. If pH=5.1 and you have to find the hydronium concentration, there are two significant figures total in the pH. Thus, you would put two numbers after the decimal point in your hydronium concentration answer. If you are asked to find the pH and are given the hydronium concentration such as 0.183, then the pH will have three significant figures total because there are three numbers after the decimal point in the hydronium concentration given.

Sidharth D 1E
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Joined: Sat Aug 24, 2019 12:17 am

Re: Test 1: Sig Figs

I think that Sig Figs do count on the exam, and refer to this link on how to use them: https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf

MTanikella_1K
Posts: 110
Joined: Sat Jul 20, 2019 12:16 am

Re: Test 1: Sig Figs

Sig figs count on test 1 and for pH, the numbers after the decimal point are counted for sig figs. Dr. Lavelle has a document on his website regarding sig figs rules which will be helpful!

Sreyes_1C
Posts: 90
Joined: Fri Sep 28, 2018 12:19 am

Re: Test 1: Sig Figs

I would assume they count, and I think you have to base it off how many sig figs the problem gives you. I believe its the lowest amount of sig figs the problem gives you and you match yours with those given

Yailin Romo 4G
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Joined: Wed Feb 20, 2019 12:16 am

Re: Test 1: Sig Figs

I don't think they count the sig figs as much as long as you get the correct answer I don't see why they wouldn't give full points even if your sig figs were off.

005162902
Posts: 102
Joined: Wed Sep 18, 2019 12:15 am

Re: Test 1: Sig Figs

It's usually dependent on your TA how strictly they grade sig figs so always make sure to double check them!

anjali41
Posts: 109
Joined: Fri Aug 09, 2019 12:15 am

Re: Test 1: Sig Figs

I think that I would err on the side of caution and be mindful of sig figs. Additionally, my TA mentioned that using the correct units was something they focus on as well.