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