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).

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Test 1: Sig Figs

Postby nehashetty_2G » Wed Jan 22, 2020 5:21 pm

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

Postby Wendy 1E » Wed Jan 22, 2020 7:27 pm

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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Re: Test 1: Sig Figs

Postby Sidharth D 1E » Thu Jan 23, 2020 12:50 pm

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

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Re: Test 1: Sig Figs

Postby MTanikella_1K » Sun Feb 02, 2020 6:19 pm

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!

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Re: Test 1: Sig Figs

Postby Sreyes_1C » Sun Feb 02, 2020 7:04 pm

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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Re: Test 1: Sig Figs

Postby Yailin Romo 4G » Sun Feb 02, 2020 8:09 pm

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.

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Re: Test 1: Sig Figs

Postby 005162902 » Mon Feb 03, 2020 5:54 pm

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

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Re: Test 1: Sig Figs

Postby anjali41 » Mon Feb 03, 2020 6:19 pm

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.

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