Sig figs Study guides, Class notes & Summaries
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CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS
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CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS 
 
A solid sample contains both NaOH and NaCl. 0.500 g of this solid sample was dissolved in water to make a 20.0 mL solution and then this solution was titrated by 0.500 mol/L HCl solution. If 22.5 mL of HCl was used to reach the end point, what is the mass % of NaOH in the original solid sample? 
NaOH + HCl --> NaCl + H2O - Answer- 90 
 
During titration, it is very common to have some NaOH spilled to the inside wall of Erlenmeyer fl...
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chem 121 study guide exam 1 updated 2024 with 100% complete solutions
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ALEKS Modules 1-7 (A+ Guaranteed)
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Fahrenheit Equation correct answers Tf=(Tc x 9℉/5℃) + 32℉ 
 
Celsius Equation correct answers Tc= 5℃/9℉ (Tf - 32℉) 
 
More Equations correct answers Ep=h x v 
c=weird symbol x v 
 
Average Velocity of a Gas Particle correct answers Vrms = square root (3RT/MM) 
 
R= gas law constant 
T= temperature 
MM= molar mass of gas particles 
 
Base for log correct answers It is 10 
10^5 
log10(100,000)=5 
 
Base for ln correct answers e 
Euler's number 
 
Rules for Counting Significant Figure...
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Chemistry Final ACS Exam 2024
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Accuracy? - Closeness of measurements to the TRUE VALUE of what is being measured 
 
Precision? - Closeness of a SET of measurements 
 
How do you calculate Percent Error? - I experimental-accepted I 
____________________ x 100 
 accepted value 
 
Are zeros infront of non-zero digis significant? - Nope! 
ex: 0.0071 is only 2 sig figs 
 
Are zeros at the end of a number and to the right of the decimal significant? - Yep! 
ex: 9.100 is 4 sig figs 
 
Addition/Subtraction in regards to sig figs? ...
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C215 Exam Questions with correct answers
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Aliquot - Answer- - *Portion of measurement added* 
 
- Example: "In this experiment, we will be using an *aliquot* of 10 mL of water for each trial 
 
Sig Fig Rules (Significant) - Answer- - Any non-zero digit is a sig fig 
 
- Zeros between non-zeros are sig figs 
 
- Zeros to the right of the last non-zero digit are sig figs 
 
Sig Fig Rules (Insignificant) - Answer- - Zeros to the left of the first non-zero are NOT sig figs 
 
Calculations Rules for Sig Figs (+/-) - Answer- - Focus on decim...
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Significant Figures Questions and Answers Scored A+
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Significant Figures Questions and Answers Scored A+ 
Rules for identifying significant figures 
1) All non-zero digits are significant 
2) Zeros that occur between significant digits are significant 
3) Zeros to the right of the decimal point AND at the end of the number are significant 
 
 
 
Rules for using significant figures with addition and subtraction 
1) Count the number of significant figures to the right of the decimal point for each number in the problem 
2) Add or subtract normally 
...
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Chemistry Final ACS Exam |Question and Answer| 100% Correct 2024/2025
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Chemistry Final ACS Exam |Question 
and Answer| 100% Correct 2024/2025 
Accuracy? *Ans* Closeness of measurements to the TRUE VALUE of what is being 
measured 
Precision? *Ans* Closeness of a SET of measurements 
How do you calculate Percent Error? *Ans* I experimental-accepted I 
____________________ x 100 
accepted value 
Are zeros infront of non-zero digis significant? *Ans* Nope! 
ex: 0.0071 is only 2 sig figs 
Are zeros at the end of a number and to the right of the decimal significant?...
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chem 121 study guide exam 1 updated 2024 with 100% complete solutions
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Chemistry Cumulative Test 1 Review Exam Questions With Complete Solutions
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Chemistry Cumulative Test 1 
Review Exam Questions With 
Complete Solutions 
add & subtract with sig figs ️️round to digit they all share 
multiply and divide sig figs ️️round to lowest number of sig figs 
1.672*e-27 ️️.0000000...1672 
giga ️️billion 
mega ️️million 
kilo ️️thousand 
centi ️️hundred 
milli ️️thousand
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chem 121 study guide exam 1 updated Rated 100% Correct!!
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Hypothesis vs Theory vs Law - Answer-Hypothesis: If, then, because 
Law: Statement or equation about a relationship 
- ex: force = mass * gravity 
Theory: Explains why a law exists 
Law of Conservation of Mass - Answer-Mass is always constant 
- Reactant mass = Product mass 
They are used (upheld) in chemical equations 
Three common states of matter and their characteristics - Answer-- Solid (s): color 
- Liquid (aq): melting point, solubility 
- Gas (g): 
Difference between Elements, Compounds,...
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