Chemistry Test #1 terms

Question 1

Rule for sig fig: Nonzero digits are always ____

Answer 1

significant

Question 2

Leading zeros are ______
Ex) 0.0004932g

Answer 2

not significant

Question 3

Captive zeros (zeros between non zero digits) are _____
Ex 0.0004024

Answer 3

significant

Question 4

trailing zeros with a decimal point are ___

Answer 4

significant

Question 5

Density formula?

Answer 5

p=mass over volume g/mL or g/cm^3

Question 6

Energy forms?

Answer 6

Kinetic and potential

Question 7

Joule (j) =

Answer 7

SI Unit of energy (1 cal = 4.184 J)

Question 8

Daltons Atomic theory states that:

Answer 8

1. All matter is composed of indivisible atoms
2. atoms of the same element are identical
3. Atoms combine in whole number ratios

Question 9

Law of conservation of mass states that:

Answer 9

Mass is neither created nor destroyed

Question 10

Law of definite proportions states that

Answer 10

A compound always has the same ratio of elements

Question 11

law of multiple proportions states that

Answer 11

When elements form compounds, their ratios are whole numbers

Question 12

Atomic number (z)=?

Answer 12

Number of protons

Question 13

Mass number (A) = ?

Answer 13

Protons + neutrons

Question 14

Isotopes are

Answer 14

atoms of the same element with different neutrons

Question 15

1 mole =

Answer 15

6.022 x 10^23 (Avogadros number)

Question 16

Electromagnetic spectrum (lowest to highest energy)

Answer 16

Radio < microwave < infared < visible (red -> violet) < UV < X-rays < gamma

Question 17

Longest wavelength =

Answer 17

Red (700 NM)

Question 18

Shortest wavelength =

Answer 18

Violet (400 NM)

Question 19

c = λν

Answer 19

(Speed of light = wavelength X frequency)

Question 20

E = hν

Answer 20

(Energy = Planck’s Constant X Frequency)

Question 21

Principal Quantum Number (n)

Answer 21

Energy Level (1,2,3)

Question 22

Angular Momentum (I)

Answer 22

Shape (S=0,P=1,D=2,F=3)

Question 23

Magetic (ml)

Answer 23

Orientation (-I TO +I)

Question 24

Spin (ms)

Answer 24

Electron spin (+1/2 - 1/2)

Question 25

Closest Electron To Nucleus =

Answer 25

2s

Question 26

Heisenberg uncertainty principle states that

Answer 26

Cannot know both position and momentum

Question 27

Elements VS Compounds

Answer 27

Elements cannot be chemically broken down.

Question 28

Atomic Radius Decreases =

Answer 28

Across, Increase down

Question 29

Ionization energy Increases=

Answer 29

Across, decrease down

Question 30

Destructive Interference

Answer 30

Waves cancel out

Question 31

Constructive Interference

Answer 31

Waves Amplify

Question 32

The number of cycles that pass through a stationary point are called

Answer 32

frequency

Question 33

JJ Thompson

Answer 33

Discovered electron using cathode ray: plum pudding model

Question 34

Milikans Oil Drop

Answer 34

Determined the charge of an electron (-1.602x10^-9)

Question 35

Rutherfords Gold Foil Experiment

Answer 35

Discovered nucleus, proposed nucleus model of the atom