## Determining sig figs

MedhaVallurupalli1F
Posts: 30
Joined: Wed Feb 27, 2019 12:15 am

### Determining sig figs

Is there a difference in sig figs for 100g of something versus 100.g of something? How can you tell which numbers are significant?

Chem_Mod
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### Re: Determining sig figs

Yes, there is a difference. 100g of something only has one significant figure. 100.g of something has three significant figures. Zeros after a number are significant if there is a decimal point. Examples:
0.0100 --> three significant figures
0.01 --> one significant figure
100.0 --> four significant figures
1000 --> one significant figure

Kevin To 1B
Posts: 32
Joined: Sat Feb 02, 2019 12:15 am

### Re: Determining sig figs

The reason why 100 only has one significant figure is due to the fact that zeros that only hold places are not considered to be significant.

nicknavejas1B
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### Re: Determining sig figs

I had this exact same question, thank you guys for the help!

Zachary Menz 1D
Posts: 32
Joined: Wed Nov 07, 2018 12:17 am

### Re: Determining sig figs

The difference is that 100 grams of something has 1 significant figure, while 100. grams of something has 3 significant figures. This is because the decimal point shows that the number is exact.

Sisi Li 1F
Posts: 34
Joined: Mon Mar 11, 2019 12:15 am

### Re: Determining sig figs

Decimal points will tell you how precise a number we are measuring. Looking at the number 100, you don't really know for sure whether 100 is an estimate or not- perhaps it was obtained by rounding up or down from a different number, but you don't really know for sure. On the other hand, 100. tells you that the number is exactly 100 with no estimation. Hope that helps!

Yen Ho Chou 1D
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Joined: Wed Feb 27, 2019 12:16 am

### Re: Determining sig figs

There's no difference between 100g and 100.g, but there is a difference between 100g and 100.0g or 100.00g. The zeros that follow the decimal point are significant

Jeril Joseph 1B
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### Re: Determining sig figs

I have a question. So, if you are given a problem that has one value with 3 sig figs and another value of 4 sig figs, would you express your final answer using 3 or 4 sig figs? Would the amount of sig figs used change if there's more values given with 3 or 4 sig figs??? Sorry for asking.

Yasmin Olvera 1D
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Joined: Thu Feb 14, 2019 12:15 am

### Re: Determining sig figs

I believe it would be 3 sig figs.

jlinwashington1B
Posts: 65
Joined: Fri Sep 28, 2018 12:22 am

### Re: Determining sig figs

Will the number of sig figs determine if our answer is correct or incorrect?

Haorui Li 1A
Posts: 30
Joined: Mon Jun 17, 2019 7:23 am

### Re: Determining sig figs

I think if we don't have the correct sig. fig. the points will be deducted even if you have correct answers.