General Chemistry Exam 2

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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


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