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Unit 4 Exam

Last updated over 5 years ago

50 questions

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 Answer the questions by clicking on the correct answer. You will have ONE class period in which to complete this exam. 

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  Do NOT forget to turn in this assignment on Google Classroom after you have submitted it here! No credit will be awarded for unsubmitted assignments. 

The smallest particle into which an element can be divided and still be the same substance is called a(n)

A. nucleus.

B. electron.

C. atom.

D. neutron.

What particle did J.J. Thompson discover?

A. neutron

B. electron

C. atom

D. proton

How would one describe the nucleus?

A. dense and positively charged

B. large and positively charged

C. tiny and negatively charged

D. dense and negatively charged

Where are electrons likely to be found?

A. the nucleus

B. electron clouds

C. mixed throughout an atom

D. in distinct paths or energy levels

Dalton believed that

A. atoms of the same element are exactly alike.

B. most substances are made of atoms.

C. atoms of different elements are the same.

D. atoms can be divided.

What did Democritus, Dalton, Thompson, Rutherford & Bohr all have in common?

A. They each identified new elements.

B. They each identified new isotopes of atoms.

C. They each contributed to the development of the atomic theory.

D. They each conducted experiments in which particles collided.

In Thompson's "plum-pudding" model of the atom, (our chocolate chip cookie dough model), the plums (chocolate chips) represent

A. atoms.

B. protons.

C. neutrons.

D. electrons.

An atom of gold with 79 protons, 79 electrons and 118 neutrons would have a mass number of 

A. 39.

B. 158.

C. 197.

D. 276.

Which of the following has the least mass?

A. nucleus

B. proton

C. neutron

D. electron

If an isotope of uranium, U-235, has 92 protons, how many protons does U-238 have?

A. 92

B. 95

C. 143

D. 146

How did Democritus describe atoms?

A. large, soft particles

B. dividable particles

C. small, hard particles

D. a single material with one shape and size

What is the current model of the atom called?

A. The plum pudding model

B. The chocolate chip cookie dough model

C. The Bohr model

D. The electron cloud model

Which of the following subatomic particles has no electric charge?

A. proton

B. neutron

C. electron

D. nucleus

An atom of carbon with 6 protons, 6 electrons and 6 neutrons would have an atomic number of

A. 6.

B. 18.

C. 12.

D. 15.

The discovery of which particle proved that the atom was not indivisible?

A. proton

B. neutron

C. electron

D. nucleus

If H-1 has 1 proton, how many protons does H-2 have?

A. 2

B. 1

C. 3

D. 4

How many neutrons does an atom with an atomic number of 23 and a mass number of 51 have?

A. 23

B. 28

C. 51

D. 74

What took place in the late 1880's?

A. Dalton created a new atomic theory.

B.Dalton disproved his theory.

C. Dalton's theory was proved.

D. Dalton's theory was changed.

What is the meaning of the word "atom"?

A. dividable

B. invisible

C. hard particles

D. not able to be divided

Which statement about atoms is true?

A. A penny has about 20,000 atoms.

B. Aluminum has large atoms.

C. A penny has more atoms than Earth has people (approx 7.7 billion).

D. Aluminum atoms have a diameter of about 3 cm.

Which statement about isotopes is true?

A. They have the same number of protons.

B. They have the same number of neutrons.

C. They have a different atomic number.

D. They have the same mass.

According to Rutherford, what was in the center of an atom?

A. an electron

B. a nucleus

C. a particle

D. a proton

Which phrase describes radioactive isotopes?

A. They are stable.

B. They never change.

C. They are unstable.

D. They don't produce any measurable energy.

Isotopes exist because atoms of the same element can have different numbers of

A. protons.

B. neutrons.

C. electrons.

D. nuclei.

The raised surfaces show

A. protons.

B. neutrons.

C. electrons.

D. isotopes.

 Who proposed this new model of an atom? 

A. Bohr

B. Thompson

C. Rutherford

D. Democritus

Periodic means

A. happening at regular intervals.

B. happening very rarely.

C. happening frequently.

D. happening three or four times a year.

Periodic Law states that

A. elements are either solids, liquids or gases.

B. mercury and bromine are liquids at room temperature (270 C).

C. the properties of elements change periodically trending with the elements' atomic number.

D. some elements stay in the liquid state only for short periods.

Each vertical column on the periodic table is called a(n)

A. period.

B. group.

C. element.

D. property.

The elements to right of the zigzag line on the periodic table are called

A. nonmetals.

B. metals.

C. metalloids.

D. conductors.

Most metals are

A. solid at room temperature.

B. bad conductors of electric current.

C. dull.

D. nonmalleable.

Most of the elements in the periodic table are

A. metals.

B. nonmetals.

C. metalloids.

D. semiconductors.

Mendeleev arranged the elements by

A. density.

B. increasing atomic number.

C. appearance.

D. increasing atomic mass.

Each horizontal row on the periodic table is called a(n)

A. group.

B. family.

C. period.

D. atomic number.

Which one of the following tells you the physical state of an element at room temperature (270 C)?

A. the atomic number

B. the color of the chemical symbol

C. the atomic mass

D. the element name

How do the physical and chemical properties of the elements change?

A. within a group

B. across each period

C. within a family

D. across each group

Which element is necessary for substances to burn?

A. hydrogen

B. oxygen

C. nitrogen

D. carbon

Transition metals are

A. good conductors of thermal energy.

B. more reactive than alkali metals.

C. not good conductors of electrical energy.

D. used to make aluminum.

Mendeleev found that the properties of the known elements followed a pattern that repeated every

A. 5 elements.

B. 7 elements.

C. 10 elements.

D. 14 elements.

Which element makes up about 80% of the air we breathe?

A. oxygen

B. nitrogen

C. bromine

D. carbon

The elements to the left of the zigzag line on the periodic table are

A. nonmetals.

B. metalloids.

C. conductors.

D. metals.

The groups of elements that do not have individual names are called the

A. alkali metals.

B. alkaline earth metals.

C. noble gases.

D. transition metals.

The carbon group contains two metalloids, both of which are used to make

A. dinnerware.

B. foil.

C. cans.

D. computer chips.

Diamond and soot are very different, yet both are natural forms of

A. nickel.

B. carbon.

C. boron.

D. copper.

What element is used to make the most widely used compound in the chemical industry?

A. sulfur

B. tellurium

C. selenium

D. polonium

How could you describe most metals?

A. They are easily shattered.

B. They are bad conductors of electrical energy.

C. They have no luster.

D. They are ductile.

How many of the most recently discoved elements follow periodic law?

A. none of them

B. some of them

C. most of them

D. all of them

Which of the following elements should be the best conductor of electric current?

A. germanium

B. sulfur

C. aluminum

D. helium

Which group contains elements that have six valence electrons?

A. Group 2

B. Group 6

C. Group 16

D. Group 18

Which of the following items is NOT found on the periodic table?

A. atomic number

B. atomic mass

C. chemical symbol

D. mass number