×
Log in to StudySoup
Get Full Access to ECU - CHEM 1150 - Study Guide
Join StudySoup for FREE
Get Full Access to ECU - CHEM 1150 - Study Guide

Already have an account? Login here
×
Reset your password

ECU / Chemistry and Biochemistry / CHEM 1150 / What is the meaning of pure substance in the matter?

What is the meaning of pure substance in the matter?

What is the meaning of pure substance in the matter?

Description

School: East Carolina University
Department: Chemistry and Biochemistry
Course: General Chemistry I
Professor: Sambuddha banerjee
Term: Spring 2018
Tags: General Chemistry, Midterm Study Guide, Chemistry, Chem, and Study Guide
Cost: 50
Name: CHEM 1150 Exam 1 Study Guide
Description: Here is a detailed study guide that I made for chapters 1-3. It contains the concepts that are going to be on the test and also example problems.
Uploaded: 02/14/2017
10 Pages 37 Views 2 Unlocks
Reviews


Chem Exam


What is the meaning of pure substance in the matter?



xam

1 Study

Guide

Chapter 1 4. Scientific 12. Matter

concepts Method

Study Son

Study sour

Yes

Sudy

Matter

variable composition! & No Pure substances

(Mixture Seporable into simpler

r Uniform throughout? substances?

Not

Yes Herogeneous) Homogenous (Element) [Compound


What is the meaning of mixture in the matter?



Wet sand

Tea with Helium

Pure water

Sugar

di

Nov

& Yes

d

Intensive properties :- Does not depend on the (intense intense heat amount of substance present

boiling point) - Used to identity substances

- Melting point, color, boiling point Extensive properties : - Depend on the quantity of (extend length) substance present


What is the meaning of homogenous in a mixture?



Don't forget about the age old question of What is the center of the heart?

- length, mass, volume

Study

Sudy sou

13. Units

length:

1 inch = 2.54cm

Study Soup

Volume:

1m L =

1cm2

Temperature.

K = °C + 273,15

Co K-273,15 of = 9/5 (°C) +32

(=[of -327 5%.

Sody Soup

Study So

4. Significant figures Don't forget about the age old question of What is the common name for mosses liverworts and hornworts?

- Lean rules of sig figs - Addition and subtraction: Final answer should If you want to learn more check out What is the meaning of gel electrophoresis in genes?
If you want to learn more check out What is the basic history of openness in florida and the foia?

have some number of decimal places as We also discuss several other topics like What is the meaning of red shift?

measurement with fewest number of decimal placed - Multiplication and division : Final answer

should contain some number of sig figs as measurement with least number of sig If you want to learn more check out What is the meaning of graying of america?

figs

Shudu

di

LS. Dimensional

Analysis

Info

given &

Conversion

factor

= desired

amant

12.5in

to

cm?

2.5cm = 31.8cm

12.5 ik

x

Say Sous

sady Sou

Study Soup

Stud Sou

Study Soup

StudySous

Chapter 2

concepts

11. Three laws that led to atomic theoryl 1. Law of conservation of mass

• Mass remains constant during a

chemical reaction.

• Number of substances may change

but mass stays the same. Mass of reactants mass of product

X Sour

2. Law of definite proportions

• All samples of a given compound, regardless

of their source or how they were prepared, have the same proportions of elements.

• Mass ratio: Mass of one element.

- Mass of second element

• Divide larger number by smaller

3. Law of multiple proportions.

- When two elements (A and B) form two NO2 2.28 g = 4.00 different compounds, the masses of N20 0.570g element B that combine with 1 g of

element A can be expressed as a *NO2 contains ratio of small numbers 4x more & oxygen than NO2 contains 2.28g oxygen to every 100g nitrogen NO NO contains .570g oxygen to every 1.00g nitrogen

sudy sou

Stupy Sour

) Study Soup

Sorite

Study Sour

2 Atomic Symbols, isotopes, numbers

A X = The symbol of the Atom or Isotope

x = Atomic symbol of element z = Atomic number = #protons.

A = mass number - protons & neutrons

Isotopes atoms of an element with the

same number of protons, but a

different number of neutrons. 3 Periodic Table

- Learn where transition metals, inner transition

metals, gases are found

y atomic number (protons)

Study SOUD

Study Soup

mass of

1 atom of Clin amu

35,454 chlorine

sup

ady Soul

Cation positively charged ion.

Anion : negatively charged ion

In forming an ionic compound, the cations and onions will combine

so the net charge of the compound is neutral.

• Metals tend to lose elections to become cations

Nonmetals tend to gain electrons. to become anions

Study Soul

Study Soup

107

6 Calculate atomic mass from percent abundance

and isotopic mass, Problem Silver (Ag : Z=47) has 46 known isotopes,

but only two occur naturally, oth and 10 A

Given the following mass spectrometric data, calculate the atomic mass of Agi Isotope Massa Abundance 107 Aa L 106.90 Sogo 51.84%

108.90476 - 48.16%

Sluds soup

109 Ag

Solution :

(0.5184 x 106.90509) + (0.4816 x 108.90476) = 155.41)

152.44) = 107.867 #remember sig figs.

6

Converting between

mass

moles

atoms

Problem:

are in

a penny

How many Cu atoms Weighing 3.10g!

Given info: 3.10 g copper penny

mw = 63.546 g/mol

Avogadro's number: 6.022 x 10 Solution :

3.10 gto 1 mol 16.022x102 Cu atons

63.5520 L Imol.

2.9441022 Cu atoms

Study Soup

MI Study Scur

1

Chapter 3 Concepts Naming Compounds Ionic compounds. Transfer of elections to non-metal.

Study Sous

from metal

Covalent compounds formed when elements share elections, which usually occurs between non-metals

name of/ charge of base name Ionic metal and nonmetal

cation #co

(cation of onien

(non metal)

Ex.

FeCl3

» iron (111) chloride

name of

i base name of est dement) pictix 1 second element tid!

Moleator

nonmetals

-

Prefix

Study Soup

Ex.

P2Os

diphosphorous

pentaxide

SOU

basc name

Binary acids (two element)

hydrol of nanmetal

acid

e

Ex. HCl hydrochlovic acid @ Polyatamic ions Memorized

Carbonate: CO 2 - Sulfite: SO2 - Nitrite: NO2

Sulfate: 304 Nitrate : NO

Chlorite: Clog I Phosphate : PO 3 -

chlorate : Clo,

Study Soup

6

Naming Compounds Na S3 = Dinitrogen trisulfide /Covalent because (it doesn't have la metal

Na Cl ionic

=

Sodium

Chloride

metal

a

Sulfate

- 3

©

FeSO4 = Ironcinsulfate Ivan (11) Sulfate

Studs Soup

Study Sour

& Nitrite

Dous + Acid

+6 I Fez (SO4)3 * HNO2)

= Nitrous

psulfate ic + 6 H2SO4

= Sulfuric

Study

Acid Acid

Studio

Acid

Hydro

Bromine

DHR.

= Hydrobromic

Acid

Practice

Problems Exam 1 Study (vide

lift

1

HE

x

H

Thin

l2in

thin

9.881b/ft3

les 9.88 16 lft

1 ft3 1728 in?

-

1 in 2.34cm3

= 16.387cm3

udy Soup

lin? 16.387 cm3

4

lcm2 ImL

453.599 = 0.1582 6 / mL

llb

= 10. 158 9/mL

(same sig figs as the 9.881b/ft3 which was starting

value)

How

many

seconds is

125 years ?

= 125 yr x 365.24 days 24 hr 60 min & 60 sec

lyr Iday Ihr Imin = 3944592000 = 13.94x109/

3 You have 253.5g of Cu wire

a) How many moles is this?

253.5 g Cox

Imol 63.55

= 3.989 mol of Cul

Study sou

I b) How mong

atoms is

this?

3.989 mol x

6.022 x 102 atoms = 2.402 x 1024

I mol

to

en

tu

lugar

Isotopes are atoms of the same element with the same number of protons, but different number of neutions.

Calculate the atomic mass of bromine given the following information: Br-79=78,918 amo 51% abundance Br-

81= 80.916 amu 49% abundance

(78.918 amu) (0.51) = 40.248 (80.916 amo) (0.49 = 39,649

( 79.897

& Identify the number of neutrons and the element

for the isotope below.

Atomic mass

13 1 Xe neutrons : 77

Protons

54 -

-

A cation is a positively charged species when an atom loses an election, and an anich is a negatively charged species when on atom

gains an election.

) Study Soup

Study Soul

sidy Soup

Study Soup

You know that carbon has an average isotopic mass of 12.05 amo. Calbon has two isotopes one with 6 neations and one with 7 neations. What is the isotopic abundance of each species?

Sty Soup

(= bet + b n = ( 12 = 12.x

SOSA

bet + 7 h = 613 = 13.1-x

12.05 12 (X) + 13 (1-x) = 12.05amu

12x + 13 - 13x = 12.05

12+ - 13x = -95

-Ir-.95

x=.95F 95 % for

5% for

C12 Cis

OUT

Determine the molecular formula for a

compound that is 49.48% carbon, 5.19% Hydrogen, 28.55% Nitrogen , and 16.48% Oxygen,

The molar mass is 194. 19 g/mol.. 49.48gC l ml

Imola 4

24 Hs No 0 = 97g/mol imol 2

194.19 - 16.48 g Olnog = 1

THN.nl

imel

25

5.199 H 28.859 N

Imal

97

Page Expired
5off
It looks like your free minutes have expired! Lucky for you we have all the content you need, just sign up here