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# June 2017 Chemistry Regents

Registered User Posts: 227 Junior Member
Test is Tuesday morning, start sharing concerns/questions

## Replies to: June 2017 Chemistry Regents

• Registered User Posts: 19 New Member
Lets get 100
• Registered User Posts: 22 New Member
Hey so anyone know any good websites/ techniques and methods to get a high 90 on this regent
• Registered User Posts: 227 Junior Member
http://www.cheat-sheets.org/saved-copy/200WaysChem.pdf
We got this in class...200 ways to pass the chemistry regents
• Registered User Posts: 597 Member
I would recommend taking a practice test and seeing what concepts you need work on. There are things like characteristics of ideal gases and excited states that is like always on the test. Also, know how to use each table in the reference tables.
• Registered User Posts: 597 Member
Yes that 200 things is very good because there are a lot of terms you need to know. Take some if the recent exams on nysedregents.org
• Registered User Posts: 227 Junior Member
The one thing i don't understand is Significant Figures. My original teacher couldn't teach, and that was the only unit he taught us. The super-sub then never made us use them, so none of us know how (all ik is LN-CA-RIDE)
• Registered User Posts: 597 Member
Significant figures are the number of digits you can measure with certainty. Here is how to find how many significant figures a number has:

1. Ignore any zeros to the left of a number
2. Any non-zero digit is significant.
3. Any zero between two non-zero digits is significant
4. Any zero after a digit after a decimal point is significant.

Examples:
321 has 3 sig figs
33000000000 has 2 sig figs (since it is just 3.3*10^10)
4002000 has 4 sig figs (4.002*10^6)
.00000002 has 1 sig fig (2*10^-8)
.30000 has 5 sig figs (since the zeros after the 3 tell us that we know to 5 decimal places)
.0020 has 2 sig figs (2.0*10^.3)

When adding, subtracting, multiplying, dividing, etc. numbers with sig figs, you can only be as accurate as your lesst accurate number:

2.00g*.003L is only reported to 1 sig fig since 2.00 has 3 but .003 has only 1.
• Registered User Posts: 597 Member
Lemme know if you have any other questions. Basically, you should not say 1g/3L=.3333333333g/L because that implies that you know that you are correct to 10 decimal places. You should just say .3g/L
• Registered User Posts: 227 Junior Member
i get SF's in context of just "how many does this number have" but not in application of like percent error problems
• Registered User Posts: 597 Member
There was one a year or two back that was like "to how many significant figures should the density be reported". I would honestly just look up a video or article online for a better explanation.
• Registered User Posts: 14 New Member