ENGR 1A Review

Question 1

What are lone pairs?

Accepted Answer

Nonbonding electrons that aren't shared by atoms

Question 2

Metallic character increases from right to left and top to bottom across the periodic table

Accepted Answer

False

Question 3

This is...

Accepted Answer

The relationship between frequency and wavelength for energy waves.

Question 4

Which of these are NOT subatomic particles of an atom?

Accepted Answer

Ion

Question 5

What is an atom's atomic number and what letter is used to identify it?

Accepted Answer

The number of protons in the atom; Z

Question 6

What is an isotope?

Accepted Answer

An atom with a different number of neutrons in its nucleus

Question 7

What does this equation calculate?

Accepted Answer

The energy of the photon released during relaxation

Question 8

Which of these is NOT true about light?

Accepted Answer

It is a type of electrothermal radiation

Question 9

Which of the quantum numbers and the properties that they determine are incorrectly matched?

Accepted Answer

ml - orbital size

Question 10

Which of these do NOT have the correct Angular Momentum QN and orbital shapes listed?

Accepted Answer

l = 3 --> f --> hearts

Question 11

What is the coordination number of an atom in a simple cubic unit cell?

Accepted Answer

6

Question 12

Electron affinity tends to increase going left to right across a period and bottom to top through a group

Accepted Answer

True

Question 13

What isotope is this, how many neutrons does it have, and what element is it an isotope of?

Accepted Answer

P-21 ; 21; Phosphorus

Question 14

Where are the nonmetals and metalloids located on the periodic table?

Accepted Answer

p-block

Question 15

What is the electron configuration of a neutral Chromium atom?

Accepted Answer

Cr = [Ar] 4s13d5

Question 16

I learned at least 3 new things in ENGR 1A this quarter

Accepted Answer

True

Question 17

What is resonance?

Accepted Answer

When 2 or more valid Lewis structures can be drawn for the same compound, Where some degree of electron delocalization occurs to stabilize a molecule

Question 18

What is VSEPR theory used for?

Accepted Answer

Predicting angles between atoms in a covalently bonded molecule, Determining the 3D molecular geometry and electronic geometry of molecules

Question 19

The radius of a cation is much larger than that of a neutral atom due to experiencing a larger effective nuclear charge

Accepted Answer

False

Question 20

Why do atoms in covalently bonded molecules want to form octets?

Accepted Answer

Forming an octet creates a "Noble Gas Configuration", decreasing energy

Question 21

Which of these would make a molecule nonpolar?

Accepted Answer

Symmetrical shape & bonding/atom arrangements

Question 22

Which of these are NOT true about the photoelectric effect?

Accepted Answer

Photon energy is inversely proportional to its frequency: E=\frac{λ}{hc}

Question 23

Which of these aren't a part of the electromagnetic spectrum

Accepted Answer

Ultrasonic waves

Question 24

What is paramagnetism?

Accepted Answer

When atoms/ions have a net magnetic field due to having unpaired electrons

Question 25

Predict the charge that an atom of chlorine would obtain to become an ion

Accepted Answer

-1

Question 26

Which of these is an example of a natural polymer?

Accepted Answer

Gelatin

Question 27

What are the 4 quantum numbers and their symbols?

Accepted Answer

Principle (n), Angular momentum (l), magnetic (ml), spin (ms)

Question 28

What is the formula and name of the compound created by the ions shown below?

Accepted Answer

Fe2(SO4)3 : Iron (III) Sulfate

Question 29

Why do we need quantum mechanics?

Accepted Answer

To explain why absolutely small matter doesn't obey classical physics laws, To increase our understanding of chemistry and explain periodic trends

Question 30

Cation and anion ionic radii follow the same periodic trend as neutral atomic radii

Accepted Answer

True

Question 31

We can know both the position and velocity of an electron

Accepted Answer

False

Question 32

What is the name of the covalently bonded molecule SF6?

Accepted Answer

Sulfur Hexafluoride

Question 33

How many atoms are in a Body-Centered Cubic unit cell?

Accepted Answer

2

Question 34

How do you calculate how many hybridized orbitals were formed?

Accepted Answer

Add the number of standard orbitals that were combined during hybridization

Question 35

Which of these are NOT true about electron shielding and effective nuclear charge?

Accepted Answer

Zeffective = Charge of Nucleus + Charge of Shielded Electrons

Question 36

What is the name of the covalently bonded molecule N2O5?

Accepted Answer

Dinitrogen Pentoxide

Question 37

Which of these prefix/suffix pairs means "more than"?

Accepted Answer

hyper- ; -ate

Question 38

Which is true about the periodic table?

Accepted Answer

The arrangement of the table allows us to predict elemental properties, Elements in the same group have similar properties, Elements are arranged in rows of increasing atomic mass, Groups/families are vertical, periods are horizontal

Question 39

What is the correct formula and name for the compound created by these two ions?

Accepted Answer

NiO : Nickel (II) Oxide

Question 40

Atomic radius increases going from left to right and top to bottom in the periodic table

Accepted Answer

False

Question 41

Which of these groups contain elements that are liquid at standard temperature and pressure?

Accepted Answer

The Halogens (Group 7)

Question 42

How do you determine if a bond is ionic, polar covalent, nonpolar covalent, or pure covalent in nature?

Accepted Answer

Subtract their electronegativities and assess final value

Question 43

Elements in the third period and below can have incomplete octets in their Lewis structures

Accepted Answer

False

Question 44

Ionization energy...

Accepted Answer

is the minimum energy needed to remove an electron from an atom or ion, decreases down a group and generally increases left to right across periods, can have multiple iterations (1st and 2nd)

Question 45

________ theory explains/fixes the problems with Lewis theory

Accepted Answer

Orbital hybridization

Question 46

What is the charge of an electron?

Accepted Answer

-1, -1.602*10-31 C

Question 47

Metals are ...

Accepted Answer

malleable, shiny, conductive of heat/electricity, & lose e-s to become ions

Question 48

Which of these have incorrect allowed values for their listed QNs?

Accepted Answer

l : [1,n-1]

Question 49

In the context of ions, transition metals...

Accepted Answer

Can have multiple species of ions since they can lose several e-s, lose electrons from their highest n-value orbitals first

Question 50

What type of formula is shown?

Accepted Answer

Structural

Question 51

What is a mole?

Accepted Answer

6.022 x 1023 of something, A number, A unit of measurement used when dealing with large quantities of things

Question 52

Which of these bonding types is nondirectional?

Accepted Answer

Metallic, Ionic

Question 53

Where can you find a neutron?

Accepted Answer

In the atomic nucleus

Question 54

Which of these Principles/Rules are NOT correctly matched with their descriptions?

Accepted Answer

Aufbau Principle: Energy levels fill up from highest to lowest sublevel

Question 55

What effect do lone pairs have on a molecule's geometric structure?

Accepted Answer

Pushes atoms together and makes bonding-pair angles smaller than expected

Question 56

What is a formal charge?

Accepted Answer

Charge an atom would have if all electrons were shared equally in a bond, # of valence e-s - # of nonbonding e-s - 1/2( # of bonding e-s)

Question 57

What is an atom's electron affinity?

Accepted Answer

Measure of how easily an atom accepts an additional electron

Question 58

Which of these experiments disproved the "Plum Pudding" Model of the atom?

Accepted Answer

Rutherford's Gold Foil Experiment

Question 59

Which of these statements is false?

Accepted Answer

σ bonds result from orbitals overlapping side-by-side

Question 60

What are the 4 quantum numbers and their symbols?

Accepted Answer

Principle (n), Angular momentum (l), magnetic (ml), spin (ms)

Question 61

What are degenerate orbitals?

Accepted Answer

Orbitals of the exact same energies

Question 62

Which of these are true about the De Broglie relation?

Accepted Answer

λ=\frac{h}{mv}, Wavelength of particle is inversely proportional to its momentum

Question 63

What happens when an electron becomes excited?

Accepted Answer

The electron transitions to an orbital in a higher energy level

Question 64

What charge will elements from Group 2 obtain to become an ion?

Accepted Answer

+2

ENGR 1A Review

Questions 68

ENGR 1A Review

Questions 68