Deck 2: Atoms and Molecules

Question 1

The chemical formula for nitrite is NO₃ ⁻ .

Answer 1

False

Question 2

Cations are particles with fewer electrons than protons.

Answer 2

True

Question 3

A horizontal row of elements on the periodic table is referred to as a family.

Answer 3

False

Question 4

Silicon tetrachloride plays an important role in the production of semiconductors .

Question 5

_____ are examples of actinides.

A)Ti and Cr
B)U and Np
C)Sm and Er
D)Kr and Xe

Question 6

The vertical columns in the periodic table are called _____.

A)groups
B)periods
C)classes
D)sections

Question 7

Which of the following pairs of elements can be classified as noble gases?

A)H and He
B)Na and K
C)Kr and Ar
D)N and O

Question 8

All polymers form rigid solids at standard temperature and pressure.

Question 9

Ions of opposite charges attract one another. This attraction is governed by _____.

A)Graham's law
B)Henry's law
C)Kirchoff's law
D)Coulomb's law

Question 10

The systematic name of AlCl₃is aluminum chloride.

Question 11

Group II elements (Be, Mg, Ca, Sr, and Ba)are commonly referred to as _____.

A)alkali metals
B)alkaline earth metals
C)halogen metals
D)lanthanide metals

Question 12

The systematic name of V₂O₅is vanadium pentoxide.

Question 13

Free radicals, such as Cl ∙, tend to be very reactive.

Question 14

The average mass of an atom is determined by:

A)adding the number of protons and electrons and dividing it by the number of neutrons.
B)averaging the masses of each isotope.
C)calculating the weighted average of all stable isotopic masses.
D)adding the number of protons and neutrons and dividing it by the number of electrons.

Question 15

In the context of the modern periodic table, _____ a re examples of transition metals.

A)Fe and Zn
B)Sb and I
C)Pm and Gd
D)Al and Ga

Question 16

In the modern periodic table, the densest element is found in  _____.

A)period 2
B)period 4
C)period 6
D)period 8

Question 17

Elements in a periodic family tend to combine with the same number of hydrogen atoms.

Question 18

The nucleus of an atom is comprised of protons and electrons.

Question 19

CH₃− O − CH₃is an example of an alcohol.

Question 20

Chlorine forms four oxyanions.

Question 21

Uranium, plutonium, and neptunium are classified as _____.

A)alkali metals
B)alkaline earth metals
C)lanthanides
D)actinides

Question 22

Alkali metal cations carry a charge of _____.

A)1+
B)2+
C)2 −
D)1 −

Question 23

The systematic (IUPAC)name of NaClO₄is _____.

A)sodium perchlorate
B)sodium chlorate
C)sodium hypochlorate
D)sodium chloride tetraoxide

Question 24

The molecular formula for ammonium chloride is _____.

A)NH₃Cl
B)NH ₂ Cl ₂
C)NH₄Cl
D)NH ₂ Cl ₃

Question 25

The systematic (IUPAC)name of Sr(NO₂)₂is _____.

A)strontium nitrate
B)strontium dinitrate
C)sirium nitrate
D)strontium nitrite

Question 26

The molecular formula for calcium phosphate is _____.

A)Ca₃P₂
B)CaPO₃
C)Ca₃(PO₄)₂
D)Ca₂(PO₄)₃

Question 27

Which of the following chemical species contains 9 protons?

A)"¹⁶O"
B)"¹⁹F"
C)"³⁵S"
D)"³²P"

Question 28

The systematic (IUPAC)name of CuO is _____.

A)copper (I)oxide
B)copper (II)oxide
C)copper oxide
D)copper (II)hydroxide

Question 29

The molecular formula for tin(IV)oxide is _____.

A)TiO₂
B)SnO₂
C)SnO₄
D)TiO₄

Question 30

If an ion contains 33 protons, 39 neutrons, and 34 electrons, the ion is _____.

A)"⁷³Se^{1 −} "
B)"⁷²As^{1 −} "
C)"⁶⁷Y¹⁺"
D)"⁷³Se¹⁺"

Question 31

The molecular formula for strontium chloride is _____.

A)SrCl₂
B)StCl₂
C)SrClO₂
D)SrCl

Question 32

The molecular formula for lead nitrate is _____.

A)PbN₃
B)Pb(NO₂)₃
C)Pb(NO₃)₂
D)PNO₃

Question 33

Consider ²³⁵U. How many neutrons are present in this nuclide?

A)143
B)235
C)92
D)177

Question 34

The molecular formula for rubidium chloride is _____.

A)RuCl₂
B)RbCl₂
C)RuCl
D)RbCl

Question 35

How many neutrons are present in ²⁰¹ Hg?

A)201
B)80
C)283
D)121

Question 36

CaCl₂is an example of a(n)_____.

A)covalent compound
B)formula unit
C)molecular compound
D)organic acid

Question 37

The molecular formula for iron(II)bromide is _____.

A)FeBr₃
B)FeBr₂
C)I₂Br₂
D)IBr₃

Question 38

The molecular formula for dinitrogen pentoxide is _____.

A)N₂O₅
B)(NO₅)₂
C)2NO₅
D)N₂P₅O

Question 39

The systematic (IUPAC)name of MgI₂is _____.

A)manganese iodide
B)manganese diiodide
C)magnesium iodide
D)magnesium (II)iodide

Question 40

How many electrons are present in ⁴⁰Ca²⁺?

A)40
B)38
C)20
D)18

Question 41

When electrons are shared between pairs of atoms rather than donated from one atom to another or mobile across an entire lattice, we have _____ bonding.

Question 42

The atomic mass of an atom is the number of _____ in that particular atom.

Question 43

The ratio of isotopes for a given element can be measured instrumentally using a _____.

Question 44

Which of the following is a metalloid?

A)Boron
B)Lithium
C)Uranium
D)Tungsten

Question 45

Anions are negatively charged species that contain fewer electrons than protons.

Question 46

Which of the following isotopes has the highest number of neutrons?

A)"⁸⁵Rb"
B)"²⁸Si"
C)"⁷⁹Br"
D)"⁸³Kr"

Question 47

Barium is an alkali metal.

Question 48

An _____ provides the relative ratio between the numbers of atoms of the different elements present in a  compound.

Question 49

Atoms of the same element that have different numbers of neutrons are called _____.

Question 50

Potassium has two stable isotopes: ³⁹ K, which has a mass of 38.96 amu and makes up 93.26 % of the natural potassium found; and ⁴¹ K, with a mass of 40.96 amu. What is the atomic weight of potassium?