chapter 2 atoms, molecules, and ions

Question 1

How many neutrons are present in chlorine -37?
(atomic # of chlorine is 17)

Answer 1

20

Question 2

How many electrons are present in an iron atom?
ptable.com is a good go-to

Answer 2

26

Question 3

How many electrons are present in FE 2+

Answer 3

24

Question 4

How many neutrons are present in iodine-126?
atomic # of iodine is 53)

Answer 4

73

Question 5

How many protons are present in Al 3+
(atomic # of Al is 13)

Answer 5

13
the number of protons pretty much defines what element it is

Question 6

What is the formula weight of Ca(NO3)2

Answer 6

164 amu
1(Ca) 2(N) 6(O)

Question 7

Given the following abundances for the isotopes of Mg, what is its atomic mass?
24 Mg 23.985 79%
25 Mg 24.986 10%
26 Mg 25.983 11%

Answer 7

24.3 amu

(23.985)(0.79) + (24.986)(0.10) + (25.983)(0.11) = 24.3amu

Question 8

Given the following abundances for the isotopes of Boron, what is its atomic mass?
10B 10.013 20%
11B 11.009 80%

Answer 8

10.8 amu

(10.013)(0.20) + (11.009)(0.80) = 10.8amu

Question 9

What is the correct name for (NH4)2S?

Answer 9

ammonium sulfide

Question 10

What is the atomic mass of fluorine?

Answer 10

19 amu

Question 11

What is the correct name for MgSO3?

Answer 11

magnesium sulfite

Question 12

What is the correct name for FE2O3?

Answer 12

iron (III) oxide

Question 13

Give the chemical formula for titanium (IV) oxide

Answer 13

TiO2

Question 14

What is the correct formula for potassium hypochlorite?
ClO’s are all polyatomic ions

Answer 14

KClO

Question 15

What is the correct formula for sodium dichromate? NaCrO4, NaCr2O7, Na2CrO4, Na2Cr2O7, Na(CrO4)2

Answer 15

Na2Cr207
Dichromate has a charge of 2- so you need 2 Na’s to balance that out

Question 16

What is the correct name for ClO3?

Answer 16

chlorine trioxide

Question 17

What is the correct name for PCl5?

Answer 17

phosphorus pentachloride

Question 18

What is the correct name for N2O?

Answer 18

dinitrogen oxide

Question 19

What is the correct formula for dinitrogen tetroxide?

Answer 19

N2O4

Question 20

Give the chemical formula for carbon tetrachloride

Answer 20

CCl4

Question 21

Give the chemical formula for tetraphosphorus decoxide

Answer 21

P4O10

Question 22

What is the correct name for aqueous HBR?

Answer 22

hydrobromic acid

Question 23

What is the correct formula for hydrosulfuric acid?

Answer 23

H2S

Question 24

What is the correct name for aqueous HIO2?

Answer 24

iodous acid

Question 25

Give the IUPAC name for H2SO3 as an acid.

Answer 25

sulfurous acid

Question 26

What is the correct formula for nitrous acid?

Answer 26

HNO2

Question 27

Give the chemical formula for bromic acid.

Answer 27

HBRO3

Question 28

What is the IUPAC name for SF4?

Answer 28

sulfur tetrafluoride

Question 29

Give the chemical formula for barium hydroxide.

Answer 29

Ba(OH)2 barium has a 2+ charge and OH has a 1- so you need two OH's to balance it

Question 30

Give the chemical formula for hydrofluoric acid.

Answer 30

HF

Question 31

Give the chemical formula for silver sulfide. AgSO4, Ag2SO4, AgSO3, Ag2SO3, Ag2S

Answer 31

Ag2S

Question 32

What is the IUPAC name for MgI2?

Answer 32

magnesium iodide you don't have to use a roman numeral because mg is not a transition metal

Question 33

What is the IUPAC name for SO3? hint: it does not want the polyatomic ion name

Answer 33

sulfur trioxide

Question 34

Give the chemical formula for periodic acid.

Answer 34

HIO4 think of the 'per' as 'hyper'

Question 35

Give the chemical formula for calcium sulfite.

Answer 35

CaSO3 calcium has a 2+ charge, SO3 has a 2-

Question 36

Give the chemical formula for chlorous acid.

Answer 36

HClO2

Question 37

Give the IUPAC name for HBrO2 as an acid.

Answer 37

bromous acid

Question 38

Give the chemical formula for potassium dichromate.

Answer 38

K2Cr2O7 Cr2O7 has a 2- charge, K has a 1-

Question 39

What is the IUPAC name for (NH4)2CO3?

Answer 39

ammonium carbonate

Question 40

Give the IUPAC name for HI as an acid.

Answer 40

hydroiodic acid

Question 41

What is the IUPAC name for ICl3?

Answer 41

iodine trichloride

Question 42

What is the IUPAC name for K2O?

Answer 42

potassium oxide It's not a transition metal so you don't need a roman numeral

Question 43

Give the chemical formula for sodium hypochlorite.

Answer 43

NaOCl I'm not sure why it isn't written as NaClO but this is what was on the quiz

Question 44

Give the chemical formula for dinitrogen tetroxide.

Answer 44

N2O4

Question 45

Give the IUPAC name for H2S as an acid.

Answer 45

hydrosulfuric acid It's not an oxy-acid so it will start with a 'hydro' and end with an 'ic'

Question 46

What is the correct formula for potassium carbonate? KCO4, KCO3, K2CO3, K(CO3)2, K2CO4

Answer 46

K2CO3 K has a 1+ charge and CO3 has a 2-

Question 47

What is the IUPAC name for ZnSO4?

Answer 47

zinc sulfate zinc is an exception in that is always has the same charge, 2+ because of this, no roman numeral is needed

Question 48

What is the IUPAC name for ClO2? hint: the answer is not the polyatomic ion name

Answer 48

chlorine dioxide

Question 49

What is the correct name CaH2?

Answer 49

calcium hydride It's not an acid because an acid consists of a hydrogen and a non-metal

Question 50

Give the IUPAC name for H3PO3 as an acid.

Answer 50

phosphorous acid there is PO3 and PO4 only so one would be phosphorous acid and the other would be phosphoric acid

Question 51

Which of the following does not have a positive charge? atomic nucleus, proton, cation, lithium ion, hydrogen atom

Answer 51

hydrogen atom

Question 52

All isotopes of the same element have (assuming no charge or nuclear decay)...? The same number of protons + neutrons, the same mass, the same number of neutrons, the same number of protons, different numbers of protons

Answer 52

the same number of protons

Question 53

In comparison with the element Cu, the species Cu2+ has...? lost 2 protons, gained 2 protons, lost 2 electrons, gained 2 protons and lost 2 electrons, doubled its atomic mass

Answer 53

lost 2 electrons

Question 54

The mass number of an isotope is determined by... protons only, neutrons only, electrons only, neutrons + protons, or protons + neutrons + electrons

Answer 54

protons + neutrons

Question 55

Rutherford's famous experiment used a beam of alpha particles directed at a thin, gold sheet. Which of the following correctly describes the main findings of his experiment? electrons exist in discrete energy levels, atoms contain positively charged particles called protons, a 3rd subatomic particle called a neutron has similar mass to protons but with zero charge, the mass of an electron is very small, or atoms contain a small, dense, positively charged nucleus

Answer 55

atoms contain a small, dense, positively charged nucleus

Question 56

Elements in the same group on the periodic table have the same number of... electrons (total), neutrons, atomic orbitals, valence electrons, or isotopes

Answer 56

valence electrons

Question 57

Which of the following is the same for atoms of 11B and 12C (boron-11 and carbon-12)? number of electrons, number of protons, number of neutrons, number of protons + neutrons, or none of these?

Answer 57

number of neutrons

Question 58

What is the formula weight of chromium (III) nitrate Cr(NO3)3? use a table with amu

Answer 58

238 amu

Question 59

How many neutrons are present is Thorium-228 use periodic table

Answer 59

138

Question 60

What do the following species have in common? O (2-), F (-), Ne, Na+, Mg (2+), and Al (3+)?

Answer 60

the same number of electrons