Chem 141 exam #1

Question 1

joint proportionality

Answer 1

if x≈a, and x≈b

then x≈(a*b)

≈means proportional in these cards

Question 2

how to get (PPM)

Parts Per Million

Answer 2

multiply by 10⁶

Question 3

how to get (PPB)

parts per Billion

Answer 3

multiply by 10⁹

Question 4

mass

Answer 4

quantity of matter

Question 5

Inverse Proportionality

Answer 5

when two quantities are related in such a way that when one is doubled, the other is halved

Question 6

weight

Answer 6

measure of force of gravitational attraction

Question 7

volume

Answer 7

length * width * height

Question 8

1 ml =

Answer 8

1 cm³

Question 9

1 atm=

Answer 9

760 mm Hg

760 Torr

14. 7 psi
15. 01325 bar

Question 10

Boyles Law

Answer 10

V ≈ 1/P

Question 11

Charles Law

Answer 11

V≈T

use KELVIN

Question 12

Combined Gas Law

Answer 12

(V₁P₁/T₁) = (V₂P₂/T₂)

Question 13

Law of Conservation Mass

Answer 13

The mass of the reactants in a chemical change is equal to the mass of the products

Lavoisier and sealed jar

Question 14

Law Of Multiple Proportions

Answer 14

The mass of one substance that completley reacts with the other (100) parts of the other substance occurs in whole number ratios

such as (72:36) which is (2:1)

since 72+36=100 parts

Question 15

In the Crooks tube the current traveled from

Answer 15

cathode to anode

Question 16

Cathode Rays

Answer 16

negatively charged

Question 17

Anode Rays

Answer 17

positively charged

Question 18

Law of Combining Volumes

Answer 18

volume ratios in which gases react occur in whole numbers

Question 19

J.J. Thompson

Answer 19

discovered electrons

w/ crooks tube

Question 20

Millikan’s Oil drop experiment

Answer 20

discovered the charge on a electron is always a intregal muliple of the same number

Question 21

Rutherford’s Scattering Experiment

Answer 21

showed the nucleus has a positive charge when it repelled positively charged alpha particles

(nuclear model of atom)

(because it has protons found out later)

Question 22

Rutherford

Answer 22

discovered the proton

Theorized their was neutral atom and handed work off to chadwick

Question 23

Chadwick

Answer 23

discovered the neutron

w/ help of Rutherford

Question 24

Isotope

Answer 24

atoms of the same element can have different numbers of neutrons and thus different masses

Question 25

mass # of element

Answer 25

protons + neutrons

Question 26

atomic # of element

Answer 26

protons

Question 27

Electron

e^-

Answer 27

9. 109x10^-28 grams
10. 000549 u ≈ 0

1/2000

• very small compared to neutron/proton size
• outside nucleus

Question 28

1 atomic mass unit (u) =

Answer 28

= 1/12 the mass of a carbo-12 atom

6. 02x10²³ u = 1 gram
   - how to express masses of atoms

Question 29

Proton

p , p⁺

Answer 29

1. 673x10^-24 grams
2. 00728 u ≈ 1
   - inside nucleus

Question 30

Neutron

n , n⁰

Answer 30

1. 675x10^-24 grams
2. 00867 u ≈ 1
   - inside nucleus

Question 31

Density of H₂O

Answer 31

1 g/ml

Question 32

Pressure=

Answer 32

Force/Area

Question 33

Density=

Answer 33

Mass/Volume

Question 34

1 gallon= _____ L

Answer 34

3.785L

Question 35

1 lb=______g

Answer 35

453.6 g

Question 36

1 inch=____cm

Answer 36

2.54cm