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Chem 103 Significant Figures and Chapter 1 Suzanne
Part 1: Significant Figures
Significant Figures Rules
1. All ___________ _________ are significant.
2. Zeros ____________ ___________ are significant (known as ___________ zeros).
3. Zeros to the __________ of a number are not significant (also known as ___________).
4. Zeros to the __________ of a number after the decimal point are significant (__________ zeros).
5. What must come after a number to make all digits significant?
Write the number of significant figures for each:
a. 0000.465
b. 1946
c. 3500.
d. 0.00001385
e. 0.29500014
f. 0.0050760
Part 2: Significant Figures Calculations
I. Adding and Subtracting Sigfigs
Problems:
1) 24.1 + 21.08 = 4) 103.12 – 45.6 =
2) 5.8 – 0.009 = 5) 97.2 + 125 =
3) 0.0404 + 125.045 = 6) 7.20 + 3.013 + 0.04327 =
II. Multiplying and Dividing Sigfigs
Problems:
1) (0.0404) • (16) = 4) 89 ÷ 12.08 =
2) 2.30 ÷ 24 = 5) (0.0821) • (0.023) • (298) =
3) (15.4 𝑔𝑔𝑐𝑐𝑐𝑐3 ) • (21 𝑐𝑐𝑐𝑐3) = 6) (0.0821)•(0.023)•(298)1.5 =
Answer
key !
nonzero integersbetween 2 integers captive
left leadingright trailing
decimal point
3. sigfigs4 sigfigs4 sigfigs-04 sigfigs
leading zeros
captive Srsigfigs.
5 sigfigs
ieadi%captivettrailingsigaifikfntthf.ge#stqe-eramonmn.info
"s '
40.0
45.18 -045.2 57.52 -057.5
isiglig 2¥94'Sg.ya, → g. g 222.2 -0222
125.0854 -0 125.085 10.25627-010.26
Eg . 6.890-3 sigfigsLook at the least amount of × 18.931 ← ssigfigs
siggigsoverall
¥43459130 or1.30×102.6464-00.65
7.367549 -07.4
0.09585 -00.10 0.5627 -00.56
✓ I323.4)
0.37514 -0 0.38
3. 2×1029
Chem 103 Significant Figures and Chapter 1 Suzanne
Part 3: Chapter 1 Review
I. Terminology – define each definition and on the left side, list which section of Chp 1 they come from
a. Science –
b. Chemistry –
c. Technology –
d. Alchemy –
e. Hypothesis –
f. Scientific law –
g. Science theory –
h. Scientific model –
i. Risk –
j. Benefit –
k. Mass –
l. Weight -
II. Short Answer Questions
1. What is the difference between heat and temperature?
2. Differentiate: physical change and chemical change; physical properties and chemical properties.
3. Convert the following to their SI base unit. a. 2.17 nm b. 9.25 µs c. 0.0613 ML
4. Looking Ahead: Atoms a. Calculate the molar mass of glucose or 𝐶𝐶6𝐻𝐻12𝑂𝑂6.
b. Determine the values missing from the table.
Elements # Protons # Neutrons # Electrons
Na 12
23 23
Se 34
Ar 18 22
An accumulation of knowledge about nature and physical world
the study of matterand the changes it undergoes
practical application of knowledge by which humans modifythe
materials of natureto better satisfy their needs and wants
A mixture of chemistry and magic practiced in Europe duringMiddle Ages
A tentative explanation of observationsthat can be tested by experiment
A summaryof experimentaldata
Best current explanation for a phenomenonUses tangible items or pictures to represent
invisible processes
any hazard that leads to lossor injury
any that promoteswell-being or has a positive effect
A measure of the quantity ofmatterA measure of the force of attraction
between Earth and an object .
Heat is energy on the move .
Temperature is the measure of hot or cold
↳ altering physical to alteringwhole to oxidation,toxicity ,
identity of substance↳ color
, temperature,appearance I state boiling point , odor flammability=2-17×10-9 nm = 9.25×10
-bus0.0613 ML y#=
61,300 L or 6.13×10"L
l ML
atomic ¥÷Yz¥Yj÷IffgiYmomdf 180g Imd or glucosemassof
eachelement#
11 It
✓ 27
34 44
18
Chem 103 Significant Figures and Chapter 1 Suzanne
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