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ISU / Chemistry / CHE 110 / What are the significant figures of rules?

What are the significant figures of rules?

What are the significant figures of rules?

Description

Quantity/Unit Abbreu. length meter mass Kilograms/ kg temperature (Kelvins IK


What are the significant figures of rules?



time seconds Is Amt. of substance mole mol

- compounds

odd ends -molecular: covalent bonas "Stick

exy H2O, CO2 clonic: tatracting - RK NaCl, CaCl2

lon: charged 20on: negative We also discuss several other topics like Does the data set have a mode?

ration: positive Diatomics - elements that are molecules rather than straight atoms/ EXI H2;02, N2, Cla, Brz,


What is the chemical formula of calcium chloride?



Don't forget about the age old question of What is the purpose of social work?

I2, F2

FlonversIONST * Here's where units & prefives come in * les A pound (410) of your favorite potato chips cost $4.50. A 1002 bag of a competetor's brand costs 33.75. which is a better deal? * figure out 100% of favorite chips cust*


What is the chemical formula of beryllium oxide?



We also discuss several other topics like What if the data does not support the theory?

the $4.50 - $ 2.81 for 1007 20160p 716 14 favorite ones are

Labeler cleal! lex convert 150 lbs to Kilograms and then grams.

08.0 15010S i kg - xKg x 2.2051 . .

027 grams en convert 2 quarts tol

02759 -

Lot

1000g

Derived units two units essentially shoved together

ex miles/hr, Keluins/second prefix: muitplication or division of a gium unit. ex Kilo-, centi We also discuss several other topics like What is the meaning of first-level packaging?

Thebers) (hivotn)

1 Kg

anos

Objective 3 ML 246 * .657&t=11.8923 tools of the trade'

Density def: amant of Stuh you can fit in a certain space If you want to learn more check out What did hume say about the concept of natural law?

Wome US precision Accuracy: did you hit what

You were aiming for?

•clensity of a substance

preaston: Did you get

there often? can change with states Of matter I temperature.

Landcracy Text What is the density of a substance when 5. og 15 low precision Placed in 10.0mL of water the volume of the water rises to 12. We also discuss several other topics like What freedoms did the colonists have?

5mL? (5)=d=2.Oglm L. High accuracy High Accuracy

low precision High precision

.

hin precision

Significant figures rules Rules: O All nonzeros are significant © Exact numbers have no incertainty 3 a)

zeros are significant when they're Inbetween two nonzeros lex 305) and at the end of a number with a clecimal point (2x 3.00, 20., 25.160)

b) zeros are not significant when it is between a decimal and the first nonzero cligit lex) 0.0025, 0.0183) of sig figs tells us precision of measurment. 2) All of the numbers we're sure of

plus one guess. exact numbers have unlimited

sig figs

number

Heat -q

> 39.10

|

mass

protonstneutrons

mass ist heutrons

electroneguhuih.

18=650057

Abbreviations VOBjective 4: Basic Structures & Properties of mattert Energy-E calculating to change tempi Panodic table Element Kinetic Energy -KE

Potassiumza name

q=MSAT (Heat = mass specific heat.AT)

atomic 19

Potential Energy-PEL How much heat must be added to raise #of protons

- symbol

the temperature of 449 of water from Temperature -T 115oC to 50°C? (5=4,184 SigoC for water)

0.84"lectronegchun

q=449 *4.1845/9°C X35

Joules -J Specific heat -S

Parts of an arum

An unknown plece of metal weighing 950 is heated to 98°C and is dropped into 258

Location charge mass (4)

inchemistry we of water at 23°C. The temperature of the

proton Nudeus

+1 I

take

water and metal is zque. finds of metal.

the position

I Neutron Nucleus Lo TNI

of the system

REMSAT (nect of water) 8 = 2509*4.184 x 6°C -6300J

election cloud 1-1 Approx. 07

lf energy comes in, cheat of metal) 6300J = 959 x S + 647

[Change in ...

effect

it is positive (+). S=.925)

Proton # changes charge & element 'If every goes at, Physical prop, Chem. prop or Pie Chiang electron # changes charge mere ces)

Hisa loss, so (-). I flammable - chemical property E tEor-E?

Terminology

l Density is 1.06 - Physical property Artic Ice melting (+E) Specific heat-physical property

tons - change in electrons

caton - “positive losers"> lose e- to become + Starting a car (te).compound is yellow - physical property Janion - "negative gainers"->gaine' to become - Flash atlantninalost Bleaching hair with H2O2 -chemical chany atoms-smallest part of matter that's Dryice vapenzing its rammering copper wire - physical change made up of protons, neutrons, & electrons

7. Boiling water - physical change Ex] 27Io P=53 n-548=54

Blowing up a balloon (2). Dissolving sugar in H20 - Euro hotel ya 65 Zn P-30 N= 35 € -30 - Lighting a match - Chemical change Exl. 1266 $ %6C are Isotopes

Tanahons & mars

Play Objective 5 N

#5a

INTERACTIVE SIMULATIONS University of Colorado Boulcher

BALANCING CHEMICAL EQUATIONS

Load the simulation Balancing Chemical Equations http://phet.colorado.edu/en/simulation/balancing-chemical-equations

CRITICAL THINKING QUESTIONS

1. Explore the Balancing Chemical Equations simulation. Discuss with your group what you find.

hat are the different ways that the simulation indicates when an equation is balanced? - smiley fire

-balance 2. For each balanced reaction, indicate the total number of molecules in the table below.

Reaction

Total Number of Molecules Reactant Side Product Side

(Left)

(Right) Make Ammonia 12 +312 | 2NH3 Separate Water am 2H2O 2 H2 + 102 Combust Methane 1 CH4 + 2O2 CO2 + 2H2O

3. Is the number of total molecules on the left side of a balanced equation always equal to the

number of total molecules on the right side of the equation? Explain your answer. xona vemdeclues are onesvest

no atoms are equal 4. For each balanced reaction, indicate the total number of atoms in the table below.

Reaction

Total Number of Atoms Reactant Side Product Side

(Left)

(Right)

Make Ammonia

Separate Water | Combust Methane

5. Is the number of total atoms on the left side of a balanced equation always equal to the number

of total atoms on the right side of the equation? 1. Yes, atoms are conaned.

6. What is the same on the left and right side of a balanced equation? Explain your answer.

Hot atoms from each einen 7. As a group, play level 1 of the balancing equation game. Write down the strategies your group

uses to balance chemical equations.

-draw

out, make sure pictures match.

BALANCING CHEMICAL EQUATIONS

PET #5Q page 2

INTERACTIVE SIMULATIONS

8. Start level 2 of the balancing equation game. Take turns in your group to balance the equations

in the sim, using your strategies from Level 1, and adding new strategies as needed.

Each person should be in charge of balancing at least one equation, asking for help from the group as needed. As a group, write down the equations as you solve them.

CH4 + H2O 3 H2 +40 CH4 +45 - CS2 +2H2S CH4 + 202 - CO2 + 2H2O C2Hot Clz -> C2HCl + HCl

20+ 2H2O - CH4 + CO2

9. In the simulation, were you able to use noninteger numbers (like 12 or 0.43) for the coefficients

in a balanced equation? Why do you think this is?

NO, cone nation Of Wass, cant split. a) Which of the following are coefficients you could use in a balanced equation?

are 1/2 0% 01 02 06 109

b) If you were balancing an equation containing the 02 molecule, which of the following would

be correct representations of O2 and its coefficient?

o 2302 Oz 302 ✓ 602 030 503

10. What do you have to do to the coefficients of equation I below to get to equation II?

i. 2 SnO2 + 4 H2 → 2 Sn + 4 H20 ii. SnO2 + 2 H2 → Sn + 2 H20 - duce by the a) Both equation I and II are balanced, but equation Ilis the correct way to write the balanced

equation. Summuti

b) Can you divide equation II by another factor and still have it be correct? Why or why not?

Noi Decause there's nothing to dlude by.

c) In a complete sentence, write down a method you could use to determine if an equation is

written in the correct way. make sure there's no coefficient to aivide by 11. Start level 3 of the balancing equation game. Take turns and write down the equations as you

solve them, along with any new strategies you needed for balancing.

Studi

BALANCING CHEMICAL EQUATIONS

allo Handout #2b pq1

Instructions: Look at each group of chemical formulas and names. Examine each group for patterns and devise a set of "rules” (the patterns) for naming the compound from the formula and writing the formula based on the name

Things to think about when looking for the patterns:

• You will want your Periodic Table. What can it tell you?

What types of elements are in the compound? Suffixes or Prefixes?

Order of the words in the name and formula?

• How do you get the correct formula (with the subscripts) from the name?

All non-metal (covalent) compounds

Group 1: Formula CO2 SO2 N20 P4010 NBr3 N204

Name carbon dioxide sulfur dioxide dinitrogen monoxide tetraphosphorous decoxide nitrogen tribromide dinitrogen tetroxide

Formula CO NO P205

Std Sou

Name carbon monoxide nitrogen monoxide diphosphorous pentoxide carbon tetrachloride silicon dioxide

U

SiO2

can be on first tho

First

Rules for Naming

awaranto. correctly use prefixes em Teft to right

(type of compound or type of elements involved) (you don't have to use all of the bulleted spaces) numbers

ΤΟΥΤΟΥ

• Read element Icompounds from left to right

Sultives do not change

· numbers are little (subscripts)

Based on your rules name these compounds or write the formula

1. OF2 Oxygen clifloride 5. disulfur dichloride S2C1 2. PC1; phosphorous trichloricke 6. bromine monofluoride Bry 3. Ngse: tetranitrogen 7. dinitrogen tetrafluoride N2 F4

8. phosphorous pentabromide P BEE sulfur trixide

4. So, tetra selenide

TOUS

| 2b pq 2

metals & non metais > TONIC

Group 2: Think about how this group is different than the last group.

Formula (H1) Naci (1)

KI MgO KO

Al2S3 KN

Name sodium chloride potassium iodide magnesium oxide potassium oxide aluminum sulfide potassium nitride

Formula NaBr MgCl2 Na2O CaF2 AICI: LiBr

Name sodium bromide magnesium chloride sodium oxide calcium fluoride aluminum chloride lithium bromide

Rules for Naming

(type of compound or type of elements involved) (you don't have to use all of the bulleted spaces)

• No prefixes

· Charges are neutralized - equal to gero

endin" ide" no changes to first name

Write the names or give the formulas for:

en LiI

5. lithium iodide

6. magnesium bromid

1. Caciz Calcium chloride 2. Beo Beryllium Oxide 3. SrBrz Strontwm Bromide 4. Nazn sodium Nitride

7. beryllium nitride Bez Nz 8. strontium iodide SrI2

o cesiumsulficle → Cs2S & Aluminum chloncle) AlCl3 ☺ penta phosphorous decaoxicle > Ps010 © Potassium phosphide -> K3P

2b pq3

Group 3: Think about how this group is different and similar to the last group

ra

Formula Cuci Cu, FeF2 FeO

Name copper (1) chloride copper (I) oxide iron (II) fluoride iron (II) oxide vandium (V) fluoride cobalt (II) chloride silver chloride zinc chloride

Formula CuCl2 Cuo FeF; Fe2O3 CrCl3 COCI: Ag2S ZnS

Name copper (II) chloride copper (II) oxide iron (III) fluoride iron (III) oxide chromium (III) chloride cobalt (III) chloride silver sulfide zinc sulfide

VF5

CoCl2 AgCl ZnCl2

Rules for Naming Ionic Compounds with

(you don't have to use all of the bulleted spaces)

• Roman numeral specifies charge on first element

• No prefixes

ends in the

· Silver & zinc don't change charge maat

silver is tl, zine is 72

Based on your rules name these compounds or write the formulas.

6. manganese (IV) oxide MAOZ

Ies

7. nickel (II) chlo

1. Coci; cobalt (III) chloride 2. Fe:0; Tron (II) Oxide 3. Crko Chromium M, Flance 4. AgBr Silver Antuna bromicie 5. Tici, Titanium (1) Chionde

8. zinc chloride 2nci 9. lead (IV) sulfide Pos2

20 pg4

Group 4:

Think about how this group is different and similar to the last group. Table 4.3 on pg 104 (or on ppt slide) might be helpful.

Formula NaOH Mg(OH)2 Ca(NO3)2 NaNO3 Mg3(PO4)2

Name sodium hydroxide magnesium hydroxide calcium nitrate sodium nitrate magnesium phosphate

Formula NH4Cl Na2SO4 (NH4)20 FeCO3 CUNO3

Name ammonium chloride sodium sulfate ammonium oxide iron (II) carbonate copper (I) nitrate

Rules for Naming

(you don't have to use all of the bulleted spaces)

Rules for Naming Dolny at omic pons

· charge mevtralize

•no prefives

He & ate

•3 eletments = polyatomie

Based on your rules name these compounds or write the chemical formula.

1. NH4NO3 Ammonium Ditrate 2. MgSO4 magnesium sulfate 3. Alpo, Aluminum phosphate 4. Licn Lithium Cyancie 5. NaHCo, Sultan A horas campanarke

o soclinh carbonate

6. ammonium nitrate NHAN3 7. lithium phosphate LigPO4 8. Iron (II) nitrate Fe (103)3

9. magnesium carbonate

10. calcium hydroxide Carol

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