The planetary model of the atom is associated with

Select one:
a. Dalton.
b. Rutherford.
c. Bohr.
d. Thomson.

Question 2
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The periodic table is most easily understood in terms of the ______________ configurations of
the elements.

Select one:
a. periodic
b. proton
c. electron
d. neutron

Question 3
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The ancient Greek who is known for championing the concept of atom was named
______________.

Select one:
a. Democritus
b. Socrates
c. Zeus
d. Plato

Question 4
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Niels Bohr focused his attention on the element hydrogen because it

Select one:
a. was inexpensive.
b. had the simplest atom.
c. could be obtained in extremely high purity.
d. was so abundant.

Question 5
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Sodium is an example of

Select one:
a. A solution
b. A compound
c. An alloy
d. An element
Question 6
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Electrons at the outermost energy level of an atom are calledAnswer .

Question 7
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According to the Big Bang theory, when did the universe begin?

Select one:
a. 12.8 billion years ago
b. 13.7 billion years ago
c. 15.2 billion years ago
d. 13 billion years ago

Question 8
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When the Sun moves off the main sequence, it will next become a _______________.

Select one:
a. dwarf star
b. red giant
c. white dwarf
d. black hole

Question 9
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The "plum pudding model" of the atom is associated with

Select one:
a. Dalton.
b. Bohr.
c. Thomson.
d. Rutherford.

Question 10
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When the absolute magnitudes, or brightnesses, of stars are plotted against their surface
temperatures or colors, we obtain a(n)

Select one:
a. Hertzsprung-Russell (or H-R) diagram.
b. none of the choices
c. random pattern.
d. straight line.
Periodi
TheAnswer puts the elements in order of increasing atomic number, into seven
horizontal rows.

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Atomic Mass
TheAnswer of an element is the average mass of all its naturally occurring isotopes.

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True or False: Molecular compounds' melting and boiling temperatures are generally low.
True
Answer:

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The Sun's energy is generated from the fusion of

Select one: wrong

a. carbon nuclei to form magnesium nuclei.
b. uranium to form lead, Pb.
c. hydrogen nuclei to form helium nuclei.
d. helium nuclei to form carbon nuclei.

Question 5
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True or False: Dalton was the first to introduce the idea of the atom.
False
Answer:

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The planetary model of the atom is associated with

Select one:
a. Bohr.
b. Dalton.
c. Rutherford.
d. Thomson.

Question 7
Correct
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 Flag question

Question text

The horizontal rows of elements in the periodic table are called

Select one:
a. families.
b. periods.
c. series.
d. groups.

Question 8
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What is the formula unit of molecular compounds?

Answer:

Question 9
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About 75% of the mass of the visible universe is composed of which element?

Select one:
a. Silicon
b. Helium
c. Iron
d. Hydrogen

Question 10
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The heaviest elements are created in _______, the fantastic death of supergiant stars.

Select one:
a. nebulae
b. red giant
c. supernovae

Question 11
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He defined the word element as a form of matter that could not be split into simpler forms.

Select one:
a. Robert Boyle
b. Mendeleev
c. Ernest Rutherford
d. Niels Bohr

Question 12
Correct
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Valenc
Electrons at the outermost energy level of an atom are calledAnswer .

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True or False: When a gas is compressed, its temperature decreases.

False
Answer:

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AboutAnswer % of the universe is hydrogen.

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Aluminum is an example of

Select one:
a. an element.
b. a compound.
c. an alloy.
d. a solution.

Question 16
Correct
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The majority of stars are small, cool, type-M stars called

Select one:
a. brown dwarfs.
b. red dwarfs.
c. white dwarfs.
d. blue dwarfs.

Question 17
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Question text

Diamon
Answer is a form of carbon that is extremely hard and is one of the few materials that
can scratch glass.

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When the Sun moves off the main sequence, it will next become a _______________.

Select one:
a. dwarf star
b. white dwarf
c. black hole
d. red giant

Question 19
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True or False: The alchemists have been successful in changing lead to gold.
False
Answer:

Question 20
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 Flag question

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Who coined the term, "radioactivity"?

Select one:
a. Pierre Curie
b. Henri Becquerel
c. Marie Curie
d. Ernest Rutherford

True or False: Platinum has very high density.

True
Answer:

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True or False: Noble gases almost never react to other substances.

true
Answer:

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True or False: The catalyst is a reactant in the chemical reaction it speeds up.
False
Answer:

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True or False: Lower activation energy = more reactant particles with enough energy to
react causing the reaction to occur faster.
True
Answer:

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Flamma
Answer refers to the ability of matter to burn.

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Catalys
AAnswer is a substance that increases the rate of a chemical reaction.

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Correct
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Catalysts in living things are called

Enzymes
Answer:

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True or False: Silver conducts electricity at minimal circumstances only.

False
Answer:

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True or False: Substances made of wood are not prone to flammability.

False
Answer:

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Density
Answer refers to the concentration of a substance.

Identification: How fast or slow a chemical process takes place.

Answer:

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What is the proper term for catalysts involved in biological processes?

Enzyme
Answer:

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Which atom is more positive than the other in a molecule of dihydrogen oxide?

Answer:

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Identification: Which reaction rate factor is due to the amount of reacting substances?
Concentration
Answer:

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Flamma
Answer refers to the ability of matter to burn.

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Physic
Fill in the blank: TheAnswer property of a substance can be observed without
changing the substance.

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Answer is occurring when gas bubbles are released during the reaction.

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Identification: These properties can be detected using your senses.

Physical Properties
Answer:

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True or False: Carbon in graphite can be described as hard as the carbon in diamond.
False
Answer:

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Precipi
The solid that settles out of a liquid solution is calledAnswer .

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In a water molecule, which atom is more frequented by the shared electrons?

Answer:

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Identification: Reaction rate factor that is due to the movement of the molecules of the
reactants.

Answer:

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Identification: Factor in the rate of reaction that is caused by the amount of reactants.

Answer:

Question 14
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Identify the substance that hastens chemical reactions?

Catalyst
Answer:

Question 15
Correct
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True or False: Lower activation energy = more reactant particles with enough energy to
react causing the reaction to occur faster.
True
Answer:

Question 16
Correct
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 Flag question

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What do you call the solid formed when a liquid solution is allowed to stand still for a long
amount of time?

Select one:
a. Reactivity
b. Precipitate
c. Density

Question 17
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True or False: Sodium can exist by itself. false

True
Answer:

Question 18
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What type of covalent bonding is characterized by the incongruent sharing of electrons

between the atoms?
Polar Covalent Bonding
Answer:
Question 19
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Identification: What do you call the solid formed when a liquid solution is allowed to stand
still for a long amount of time?
Precipitate
Answer:

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True or False: Platinum has very high density.

True
Answer:

True or False: Molecular compounds' melting and boiling temperatures are generally low.
True
Answer:

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Wilhelm Roentgen discovered

Select one:
a. radio waves.
b. X-rays.
c. gamma rays.
d. microwaves.

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The temperature of the Sun's interior is estimated to be about how many kelvins?

Select one:
a. 15 million
b. 5 billion
c. 60,000
d. 1500

Question 4
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This consists of fundamental particles called leptons.

Select one:
a. protons
b. electrons
c. neutrons
Question 5
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The "billiard ball model" of the atom is associated with

Select one:
a. Thomson.
b. Bohr.
c. Rutherford.
d. Dalton.

Question 6
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The greater the mass of a star, the _______________ it moves through its life cycle.

Select one:
a. slower
b. Neither of these; mass has no effect on the life cycle of a star.
c. faster

Question 7
Correct
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Energy
Answer are fixed distances from the nucleus.

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Polar C
When electrons are not shared equally between two atoms, it is calledAnswer bonds.

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The Sun's photosphere is, by mass, about 75%

Select one:
a. hydrogen.
b. oxygen.
c. helium.
d. carbon.

Question 10
Correct
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 Flag question

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About 75% of the mass of the visible universe is composed of which element?

Select one:
a. Silicon
b. Helium
c. Hydrogen
d. Iron

Question 11
Correct
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The majority of stars are small, cool, type-M stars called

Select one:
a. blue dwarfs.
b. brown dwarfs.
c. white dwarfs.
d. red dwarfs.

Question 12
Correct
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Question text

The horizontal rows of elements in the periodic table are called

Select one:
a. series.
b. periods.
c. families.
d. groups.

Question 13
Correct
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What is the visible surface of the Sun called?

Select one:
a. Stratosphere
b. Atmosphere
c. Glowing sphere
d. Photosphere

Question 14
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Periodi
TheAnswer puts the elements in order of increasing atomic number, into seven
horizontal rows.

Question 15
Correct
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Thomson's revision of the model of the atom into what became known asAnswer
Plum Pu
model.

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The "plum pudding model" of the atom is associated with

Select one:
a. Dalton.
b. Rutherford.
c. Bohr.
d. Thomson.

Question 17
Correct
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True or False: High-mass stars eventually evolve into white-dwarves.

 False
Answer:

Question 18
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The remaining core of a planetary nebula is called a _______________.

Select one:
a. black hole
b. white dwarf
c. neutron star
d. red giant

Question 19
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What was the nationality of the first persons who we know speculated about “elements”?

Select one:
a. Roman
b. Greek
c. Chinese
d. Egyptian

Question 20
Correct
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 Flag question

Question text

In 1661, who developed a definition of element that made the concept subject to laboratory
investigation?

Select one:
a. Davy
b. Boyle
c. Lavoisier
d. Berzelius

True or False: Sodium reacts violently with water.

True
Answer:

Question 2
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Identification: Two different atoms may or may not have this type of covalent bonding.
Polar Covalent Bonding
Answer:

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Identification: Solid formed from the settling of solid particles in a liquid solution.
Precipitate
Answer:

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Non-po
Fill in the blank:Answer covalent bonding exists between two identical atoms.

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True or False: Tools made from iron easily rust.

True
Answer:

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True or False: The catalyst brings the reactants together by permanently bonding with them.
False
Answer:
Question 7
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What is the component of a chemical reaction that is present at its start?

Reactant
Answer:

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Activat
Answer energy is the energy needed to start a reaction.

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Identification: Reaction rate factor that is due to the movement of the molecules of the
reactants.

Answer:

Question 10
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Identification: This factor in a reaction rate is a consequence of the kinetic energy of the
reactant molecules?

Answer:

Question 11
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True or False: Aluminum is a good conductor of heat.

True
Answer:

Question 12
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What do you call the ability of a substance to chemically combine with other compounds?

Select one:
a. Precipitate
b. Reactivity
c. Temperature
Question 13
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What type of covalent compound is there a slight difference in the electric charge between
the opposite sides of the molecule?
Polar Covalent Compound
Answer:

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Identification: Factor in the rate of reaction that is caused by the amount of reactants.
Concentration
Answer:

Question 15
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Identification: Identify the substance that hastens chemical reactions?

Catalyst
Answer:

Question 16
Correct
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Identification: What is the proper term for catalysts involved in biological processes?
Enzyme
Answer:

Question 17
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What kind of chemical bond involves the sharing of electrons between two atoms?
Covalent Bond
Answer:

Question 18
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Identification: What is the component of a chemical reaction that is present at its start?
Reactant
Answer:

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Reactio
Answer refers to how fast a chemical reaction occurs.

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True or False: Noble gases almost never react to other substances.

TRUE
Answer:

Who discovered the electron in 1897?

Select one:
a. James Chadwick
b. Niels Bohr
c. Ernest Rutherford
d. J. J. Thomson

Question 2
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Nearly 100% of mass of Earth's core is composed of the two elements

Select one:
a. aluminum and silicon
b. oxygen and aluminum
c. silicon and oxygen.
d. iron and nickel

Question 3
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Who discovered the atomic nucleus in 1911?

Select one:
a. Ernest Rutherford
b. Marie and Pierre Curie
c. Niels Bohr
d. Henri Becquerel

Question 4
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Who discovered the electron in 1897?

Select one:
a. Dalton
b. Thomson
c. Bohr
d. Rutherford

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The water solubility of molecular compounds isAnswer .

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The greater the mass of a star, the _______________ it moves through its life cycle.

Select one:
a. faster
b. Neither of these; mass has no effect on the life cycle of a star.
c. slower

Question 7
Correct
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The temperature of the Sun's interior is estimated to be about how many kelvins?
Select one:
a. 5 billion
b. 15 million
c. 1500
d. 60,000

Question 8
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This refers to a star that has a mass of more than 8 solar masses.
Supergiants WRONG
Answer:

Question 9
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True or False: The human body is composed of 65% oxygen & 18% carbon.
True
Answer:

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The second most abundant element in the Earth's atmosphere is

Select one:
a. argon.
b. oxygen.
c. nitrogen.
d. carbon dioxide.

Question 11
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True or False: Diamond vaporizes to gas at temperatures above 3500 degrees Celsius.
True
Answer:

Question 12
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The Bohr theory was developed to explain which of these phenomena? WRONG

Select one:
a. X-rays
b. Quantum numbers
c. The photoelectric effect
d. Line spectra

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True or False: Oxygen has two polar bonds.

FALSE
Answer:

Question 14
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Niels Bohr focused his attention on the element hydrogen because it

Select one:
a. could be obtained in extremely high purity.
b. had the simplest atom.
c. was so abundant.
d. was inexpensive.

Question 15
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Molecu
Answer refers to an electrically neutral particle composed of two or more atoms
chemically combined.
Question 16
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What was the nationality of the first persons who we know speculated about “elements”?

Select one:
a. Greek
b. Chinese
c. Roman
d. Egyptian

Question 17
Correct
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The ancient Greek who is known for championing the concept of atom was named
______________.

Select one:
a. Socrates
b. Zeus
c. Democritus
d. Plato

Question 18
Correct
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 Flag question

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What is the temperature in kelvins of the visible surface of the Sun?

Select one:
a. 600 K
b. 6 billion K
c. 6000 K
d. 6 million K

Question 19
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True or False: The Earth's core is is composed of 78% nitrogen, 21% oxygen, and about 1%
argon. FALSE IS THE ANSWER
True
Answer:

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The periodic table is most easily understood in terms of the ______________ configurations of
the elements.
Select one:
a. neutron
b. electron
c. proton
d. periodic

The periodic table is most easily understood in terms of the ______________ configurations of
the elements.

Select one:
a. electron
b. periodic
c. neutron
d. proton

Question 2
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The Sun is a(n)

Select one:
a. planet.
b. cluster.
c. star.
d. galaxy.

Question 3
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Question text

The greater the mass of a star, the _______________ it moves through its life cycle.

Select one:
a. slower
b. faster
c. Neither of these; mass has no effect on the life cycle of a star.

Question 4
Correct
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Who discovered the electron in 1897?

Select one:
a. James Chadwick
b. Niels Bohr
c. J. J. Thomson
d. Ernest Rutherford

Question 5
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The planetary model of the atom is associated with

Select one:
a. Dalton.
b. Bohr.
c. Rutherford.
d. Thomson.

Question 6
Correct
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The Sun's photosphere is, by mass, about 25%

Select one:
a. carbon.
b. oxygen.
c. helium.
d. hydrogen.

Question 7
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Valenc
Electrons at the outermost energy level of an atom are calledAnswer .WRONG

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Which of these is not a basic idea of Dalton’s atomic theory?

Select one:
a. Atoms join together to form compounds, and a given compound always consists of the
same kinds of atoms in the same proportions
b. Chemical combination is simply the bonding of a definite number of atoms to make one
molecule of the compound
c. All substances are made of atoms
d. There are atoms gained/lost/changed in identity during a chemical reaction.
e. All atoms of the same element are alike and have the same mass.

Question 9
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What is the name given to all matter, energy, and space?

Select one:
a. Galaxy
b. Local group
c. Solar system
d. Universe

Question 10
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The "billiard ball model" of the atom is associated with

Select one:
a. Rutherford.
b. Dalton.
c. Thomson.
d. Bohr.

The Sun is a(n)

Select one:
a. planet.
b. star.
c. galaxy.
d. cluster.

Question 2
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True or False: Dalton thought individual atoms were solid, hard spheres so he modeled
them with wooden balls.
True
Answer:

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The Sun's energy is generated from the fusion of

Select one:
a. helium nuclei to form carbon nuclei.
b. carbon nuclei to form magnesium nuclei.
c. hydrogen nuclei to form helium nuclei.
d. uranium to form lead, Pb.

Question 4
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True or False: Molecular compounds' melting and boiling temperatures are generally low.
True
Answer:

Question 5
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What is element 61 called?

Select one:
a. technetium
b. francium
c. astatine
d. promethium

Question 6
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What is the formula unit of molecular compounds?

Molecule
Answer:

Question 7
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The heaviest elements are created in _______, the fantastic death of supergiant stars.

Select one:
a. nebulae
b. red giant
c. supernovae

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Diamon
Answer is a form of carbon that is extremely hard and is one of the few materials that
can scratch glass.

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The fusion process that explains how hydrogen is fused in hotter stars.

Select one: WRONG

a. proton-proton chain
b. CNO cycle
c. triple alpha process

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Wilhelm Roentgen discovered

Select one:
a. microwaves.
b. X-rays.
c. radio waves.
d. gamma rays.

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True or False: The alchemists have been successful in changing lead to gold.
False
Answer:

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True or False: Formaldehyde is a nonpolar compound.

False
Answer:

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Who coined the term, "radioactivity"?

Select one:
a. Pierre Curie
b. Ernest Rutherford
c. Henri Becquerel
d. Marie Curie

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Atomic
TheAnswer of an element is the average mass of all its naturally occurring isotopes.

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True or False: Diamond does not melt at all.

True
Answer:

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Variab
The water solubility of molecular compounds isAnswer .

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Where are stars born?

Answer:
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Periodi
TheAnswer puts the elements in order of increasing atomic number, into seven
horizontal rows.

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True or False: Neutrons are found in all atoms except for most atoms of nitrogen.
False
Answer:

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74% of the mass of the Earth's crus is composed of only two elements. What are these?

Select one:
a. oxygen and silicon
b. oxygen and hydrogen
c. oxygen and aluminum
d. oxygen and iron

True or False: In determining the limiting reactant, mass quantities must be converted to
moles.
True
Answer:

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Precipi
The solid that settles out of a liquid solution is calledAnswer .

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True or False: Density decreases as temperature increases.

FALSE
Answer:

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True or False: Chromium is one of the soft elements.

 False
Answer:

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True or False: Aluminum is a good conductor of heat.

True
Answer:

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Reactio
Answer refers to how fast a chemical reaction occurs.

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True or False: Carbon in graphite can be described as hard as the carbon in diamond.
False
Answer:

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True or False: Lower activation energy = more reactant particles with enough energy to
react causing the reaction to occur faster.
True
Answer:

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Catalysts in living things are called

Enzymes
Answer:

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True or False: The rate of reaction is faster if the temperature of reactants is higher.
True
Answer:
Ductile
Matter isAnswer if it can be rolled and stretched to long and thin shapes.

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True or False: Carbon in graphite can be described as hard as the carbon in diamond.
False
Answer:

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Identification: Reaction rate factor that is due to the movement of the molecules of the
reactants.

Answer:

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What kind of chemical bond involves the sharing of electrons between two atoms?
Covalent Bond
Answer:

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Identification: These properties can be detected using your senses.

Physical Properties
Answer:

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True or False: Salt can conduct electricity in any form.

False
Answer:

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What type of covalent compound is there a slight difference in the electric charge between
the opposite sides of the molecule?
Polar Covalent Compound
Answer:

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Identification: These compounds are highly soluble in water.

Ionic Compounds
Answer:

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Identification: What kind of change results to the production of a material that is entirely
different from the reactants?
Chemical Change
Answer:

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True or False: Chemical reactions occur inside living things.

True
Answer:

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What do you call the solid formed when a liquid solution is allowed to stand still for a long
amount of time?

Select one:
a. Precipitate
b. Reactivity
c. Density

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Flamma
Answer refers to the ability of matter to burn.

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Identification: This refers to the speed of a chemical process.

Reaction Rate
Answer:

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What type of compound is formed by the sharing of electrons?

Covalent Compound
Answer:

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Identification: What is the component of a chemical reaction that is present at its start?
Reactant
Answer:

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Identification: Identify the kind of change wherein the product is the same as the reactants.
PHYSICAL CHANGE
Answer:

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Density
Answer refers to the concentration of a substance.

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True or False: Noble gases almost never react to other substances.

True
Answer:

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True or False: Lower activation energy = more reactant particles with enough energy to
react causing the reaction to occur faster.
True
Answer:

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True or False: Substances made of wood are not prone to flammability.

False
Answer:

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Hardne
Answer helps determine how an element might be used.

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Reactivity
Answer is the ability of matter to combine chemically with other substances.

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POLAR
Fill in the blank:Answer covalent bond does not have an equal sharing of electrons.

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Identification: This factor in a reaction rate is a consequence of the kinetic energy of the
reactant molecules?
Temperature
Answer:
Identification: This compound is formed by a cation and an anion.
Ionic Compound
Answer:
Identification: This is the force that exists between the molecules of a compound.
Intermolecular Force
Answer:
Identification: This is another term used to refer to covalent compounds.
Molecular Compound
Answer:
True or False: New stars are born in the Orion nebula.
TRUE
Answer:
The vertical columns of elements in the periodic table are called

Select one:
a. periods.
b. series.
c. families.
d. groups.
In 1869, a major event in the history of chemistry occurred; it was the

Select one:
a. discovery of the law of definite proportions.
b. development of the periodic table.
c. discovery of the law of conservation of mass.
d. discovery of the octet rule.

When fast electrons strike a metal target, what are produced?

Select one:
a. Gamma rays
b. Microwaves
c. X-rays
d. Radio waves

He invented the neutron.

Select one:
a. Niels Bohr
b. Ernest Rutherford
c. James Chadwick
d. J.J. Thomson

He invented the neutron.

Select one:
a. Niels Bohr
b. Ernest Rutherford
c. James Chadwick
d. J.J. Thomson
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Intermo
Answer force refers to forces between molecules.

This was one of Rutherford's famous experiements where he used a radioactive source to
direct alpha particles toward a very thin sheet of gold foil.
Gold Foil Experiment
Answer: