Christmas Exam

Question 1

Atomic number

Answer 1

No of protons in an atom of that same element

Question 2

What is an electron

Answer 2

Subatomic particle, located in electron cloud of an atom

Question 3

Orbital

Answer 3

Region of space within the nucleus of an atom with a high probability of finding an electron

Question 4

Cathode rays

Answer 4

Streams of negatively charged rays called electrons

Question 5

State One limitation of Arrhenius acid base theory

Answer 5

NH3 cannot be considered a base

Question 6

Acid according to Arrhenius

Answer 6

Substance that dissociates in water to give protons

Question 7

Acid according to bronsted Lowry

Answer 7

Proton donor

Question 8

What is a conjugate pair

Answer 8

Two species that differ by a proton

Question 9

Knocking

Answer 9

Results from petrol auto igniting

Question 10

Octane number

Answer 10

Measure of a tendency of a fuel to resist knocking

Question 11

Define heat of formation

Answer 11

Heat change when 1 mole of a substance is formed from its elements in their standard states

Question 12

Define fractional distillation

Answer 12

Separation into components according to molecular size

Question 13

Hess law

Answer 13

Heat change for a reaction depends only on initial and final states

Question 14

Atomic theory

Answer 14

matter is composed of tiny, indivisible particles called atoms that can neither be created nor destroyed.

Question 15

Why might an electron not occupy n= 1

Answer 15

Excited

Question 16

What colour can be seen when electron jumps from n= 3 to n= 2

Answer 16

Red

Question 17

What are the lines on the hydrogen emission spectra called

Answer 17

Balmer

Question 18

How many orbitals are associated with n = 2

Answer 18

4

Question 19

What is the max no of electrons that can occupy n = 3

Answer 19

18 (2 + 8 + 8)

Question 20

What term described the condition of the electron when E1

Answer 20

Ground state

Question 21

What causes the electron to leave E1 level

Answer 21

Acquires energy or is heated

Question 22

Why does the electron not stay in E2 E3 etc

Answer 22

Higher energy states unstable

Question 23

What is the energy level that produces colour

Answer 23

N= 2

Question 24

How does modern atomic theory describe behaviour of electrons

Answer 24

Electrons are tiny particles that also have wave properties

Question 25

What was the purpose of milikans oil drop experiment

Answer 25

Measure magnitude of charge of electron

Question 26

What happens in a radioactive nucleus during beta decay

Answer 26

Neutron changes into a proton and an electron which is emitted

Question 27

Why does ammonia have hydrogen bonding

Answer 27

Nitrogen small and highly electronegative

Question 28

Why does ammonia have highest boiling point

Answer 28

It has hydrogen bonding which is stronger than the other intermolecular forces

Question 29

Why is phosphine’s boiling point lower than arsine

Answer 29

Phosphine molecules smaller