General Chemistry Exam 2
Which statement below is NOT consistent with the nuclear theory of the atom as proposed by Rutherford
Electrical charge is a fundamental property of protons and electrons in which like
Atoms make it so one element differs from another _________?
Element
Group 17
Halogens
All atoms of a given element are ____________?
Identical
Who discovered the electron?
JJ thompson
The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?
Law of Constant Composition
Most metals are solid except___________?
Mercury
Which of the following elements has only 12 protons?
Mg
Who studied electrically charged oil drops
Milikan
Which statement reflects the results of Rutherford's gold foil experiments?
Most all of the alpha particles passed directly through the foil.
Which of the following is not part of Dalton's Atomic Theory?
Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.
How many of each type of atoms are there in the formula NH4C2H3O2?
N = 1, H = 7, C = 2, O = 2
How many of each type of atom are there in the formula (NH4)2HPO4?
N = 2, H = 9, P = 1, O = 4
Group 18
Noble gasses
A specific isotope of an element is known to have 15 protons and 16 neutrons. Which symbol would properly represent this isotope?
P
What is the correct formula of a compound that has ten oxygen atoms and four phosphorus atoms?
P4O10
Which of the following is not a correct name, symbol combination?
Potassium P
The first chemist to formally state the law of constant composition was ________.
Proust
Who discovered the "Nuclear Atom"
Rutherford
Which of the statements about the discovery of electrons is FALSE?
Rutherford proved the plum-pudding model correct.
What is the correct formula for a compound that has three oxygen atoms and one sulfur atom?
SO3
What is the atomic symbol for tin?
Sn
All of the following statements about different elements are true EXCEPT:
Sulfur is considered a metalloid.
what is the law of conservation of mass?
The mass of the reactants is equal to the mass of the products
Which of the following statements about chemical formulas is FALSE?
The subscripts represent the relative mass of each type of atom in the compound
Group 3-12
Transition Metals or noble metals
What is the law of constant proportion?
When one element combines with another to form more than one compound. the mass ratio are simple whole numbers
Group 1A elements are also called:
alkali metals.
Mg is a member of which family
alkaline earth metals
Group 2A elements are also called:
alkaline earth metals.
When an atom gains an electron, the resulting particle is called
an anion
Which statement below accurately describes the contributions of Democritus?
ancient Greek philosopher who proposed that matter was not continuous
another name for negative ions
anion
Carbon is considered which of the following?
atomic element
Ions are formed when
atoms gain or lose an electron
Isotopes are:
atoms of the same element that have different number of neutrons.
Which statement below accurately describes the contributions of Thomson?
discovered the existence of electrons
Group 7A elements are also called:
halogens.
Which of the following is not a correct name, symbol combination?
iron I
What is an isotope?
it is the same element with a different number of protons
What is an Ion
it is when an atom loses or gains an electron
What is the correct formula for a potassium ion with 18 electrons?
k+
Metals are located where on the periodic table?
left side
Nonmetals are located where on the periodic table?
left side
Which of the following is not a correct name, symbol combination?
manganese, Mg
Carbon monoxide is considered which of the following
molecular compound
Fluorine is considered which of the following
molecular element
Which among the following elements does not exist as a diatomic molecule in nature?
neon
Xe is a member of which family?
noble gases
Group 8A elements are also called
noble gases.
Cr is a member of which family?
none of the above
What is the correct chemical symbol for mercury?
none of the above
Which statement below accurately describes the contributions of Dalton?
proposed the modern Atomic Theory
Which of the following subatomic particles has a mass of 1.66 x10-24?
protons and neutrons
the nucleus consists mainly of
protons and neutrons
what is the law of constant proportion?
regardless of the amount a given compound always has the same elements in the same proportion by mass
The names of the elements whose symbols are Si, P, Mn, and S are respectively,
silicon, phosphorus, manganese, and sulfur.
What occupies 99.99 of the space in an atom?
the protons and neutrons in the nucleus of an atom
When elements combine to form compounds,
their properties change completely.
An atom that has the same number of neutrons as
xe
Metalloids are located where on the periodic table?
zig zag
what groups are the most reactive?
1 2 18
What is the charge on the cesium ion?
1+
What is the oxygen-to-sulfur mass ratio of sulfur dioxide?
1.0
1 AMU is equal to
1.66x10^-24 g
The atomic mass unit is defined as:
1/12 the mass of a carbon atom containing six protons and six neutrons.
How many neutrons are present in Ne-22?
12
How many total atoms are in the formula Al2(CO3)3
14
What is the oxygen-to-hydrogen mass ratio for H2O2?
16
How many electrons would be in a -2 charged anion of sulfur?
18
What is the charge on the barium ion?
2+
How many carbon atoms are in the formula Al2(CO3)3?
3
What is the mass number of the hydrogen isotope that contains 2 neutrons?
3
How many electrons are in Br-?
36
An atom of a carbon-14 isotope would contain
6 protons, 8 neutrons,and 6 electrons.
Chlorine has two stable isotopes, Cl-35 and Cl-37. If their exact masses are 34.9689 amu and 36.9695 amu, respectively, what is the natural abundance of Cl-35? (The atomic mass of chlorine is 35.45 amu)
75.95
How many neutrons are present in C-14?
8
How many protons and electrons are present in O2-?
8 protons and 10 electrons.
A fictional element has two isotopes, each making up 50% of the population. Isotope 1 has a mass of 80.0 amu, Isotope 2 has a mass of 85.0 amu. Calculate the atomic mass of the fictional element.
82.5 amu
A fictional element has two isotopes and an atomic mass of 87.08 amu. If the first isotope is 86 amu and the second isotope has a mass of 90 amu. Which isotope has the greatest natural abundance?
86 amu
How many oxygen atoms are in the formula Al2(CO3)3?
9
Which of the following statements about atoms is FALSE?
A) Atoms compose all matter. B) Atoms are responsible for the sensation of smell. C) Atoms are the basic building block of nature. D) An atom is the smallest identifiable unit of an element E) All of the above statements are true.
Which of the following statements about the nature of electrical charge is FALSE?
A) Electrical charge is a fundamental property of protons and electrons. B) Positive and negative electrical charges attract each other. C) Positive-positive or negative-negative charges repel each other. D) Positive and negative charges cancel each other so that a proton and electron, when paired, are charge neutral. E) All of the above statements are true. E
What is the atomic symbol for silver?
Ag
Group 1
Alkaline earth metals
Group 2
Alkaline metals
The law of constant composition states
All samples of a given compound have the same proportions of their constituent elements.
Identify the element that is a nonmetal, a gas, and has an elemental symbol that starts with the letter "A".
Ar
Elements are made from tiny particles called_________?
Atoms
Which of the following elements has an atomic number of 4?
Be
How many protons and neutrons are in Cl-37?
C) 17 protons, 20 neutrons
How many of each type of atom are there in the formula Ca3(PO4)2?
Ca = 3, P = 2, O = 8
Properties of nonmetals are?
Can be found in gas liquid or solid are non conductors
Which of the following statements about ions is INCORRECT?
Cations are formed when an atom gains protons.
Who discovered neutrons?
Chadwick
Most metals are very good ____________?
Conductors
Atoms are indivisible and can not be _______________?
Created or destroyed
When an atom loses an electron, the resulting particle is called
cation
another name for positive ion
cation
Atoms will combine with another atoms of different element to form a ___________
compound
