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Worksheetsexam review Dec.22
Total questions: 40
Worksheet time: 1hrs 20mins
Which statement differentiates a compound from a mixture?
A compound has two identical atoms joined chemically, and a mixture has two identical atoms physically combined.
A compound must be broken down by simple physical means, and a mixture must be broken down by chemical means.
A compound has two or more atoms joined chemically, and a mixture has two or more atoms physically combined.
A compound is made of only one type of atom, and a mixture is made of two types of atoms.
The student’s claim is correct because a substance that contains more than two of the same atom is a compound.
The student’s claim is incorrect because the atoms in the substances are physically combined to form a mixture.
The student’s claim is correct because the atoms in the substances are chemically combined to form a compound.
The student’s claim is incorrect because a substance that contains more than one element is always a mixture.
Which table describes the difference between a mixture and a compound?
A compound is made of two or more different element. Which gas is classified as a compound?
carbon dioxide
hydrogen
nitrogen
oxygen
Which statement is true regarding a compound?
A compound is composed of only one type of atom that is chemically combined.
A compound is made up of two or more different atoms that are chemically combined.
A compound is an impure substance that cannot be broken down.
A compound is able to be separated into its parts using filtration.
If the solar system were used as a model of an atom, what would the Sun most likey represent?
an ion
a nucleus
a neutron
an electron
a model of an atom includes red marbles for electrons, green marbles for protons and blue marbles for neutrons. All marbles have a radius of 2 cm. How could the model be changed to represent more properties of an atom?
by using smaller marbles to represent electrons
by using two marbles to represent each neutron
by using two differently colored marbles for protons
by switching the colors of the marbles
Ninety-nine percent of the mass of an atom is located in
the outermost energy level
the first energy level
the electron clouds
the nucleus
All atoms of an element have the same number of ________ in their nuclei.
electrons
isotopes
molecules
protons
Which atomic structure is made up of more than one particle?
electron
neutron
nucleus
proton
An atom of beryllium has 4 protons, 4 electrons, and 5 neutrons. What is its mass number?
4
5
8
9
What particle always has a mass of one atomic mass unit (amu) and no charge?
a neutron
a proton
an electron
an atom
An atom of which element contains one more proton than one atom of chlorine (Cl)?
sulfur (S)
argon (Ar)
flourine (F)
bromine (Br)
A certain atom has 20 electrons, 21 neutrons, 20 protons. What is the atomic mass of the atom?
20
21
41
61
The difference between the atomic number of an element and the element's atomic mass is the number of
ions
protons
electrons
neutrons
Which parts of an atom contribute most to its mass?
protons
electrons
protons and neutrons
neutrons and electrons
An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?
50 protons, 69 electrons, 50 neutrons
50 protons, 50 electrons, 69 neutrons
69 protons, 50 electrons, 69 neutrons
69 protons, 69 electrons, 50 neutrons
Which statement best describes a neutron?
It has a negative charge.
It moves around the nucleus
It adds mass to the nucleus.
It has a postitive charge.
1
2
3
4
When an atom has a neutral charge, which particles within the atom have equal numbers?
electrons and neutrons
protons and electrons
neutrons and protons
ions and neutrons
One scientist made more significant contributions than others.
Hundreds of years passed between discoveries.
People did not think about the atom after 1913.
One discovery was important for another.
The Greek philospher Aristotle described matter with the phrase "unable to be divided." The modern concept that grew from Aristotle's idea is the
atom
proton
neutron
electron
Which scientist was the first to devise the rules of chemical reactions that are explained by modern atomic theory?
John Dalton
Issac Newton
Galileo Galilei
Albert Einstein
Elements are identified by their atomic number because
the mass of an element changes over time.
the number of protons remains constant.
atoms of the same element have different numbers of neutrons.
elements in a group react in a similar way.
A potassium (K) atom has 20 neutrons, 19 protons, and 19 electrons. What is the atomic mass of potassium?
19
20
38
39
on the left side
on both sides
on the right side
only touching
Using the image, choose the correct compostion of each bowl.
Bowl 1--metal
Bowl 2--nonmetal
Bowl 3--metal
Bowl 1--nonmetal
Bowl 2--nonmetal
Bowl 3--metal
Bowl 1--metal
Bowl 2--metal
Bowl 3--metal
Bowl 1--nonmetal
Bowl 2--metal
Bowl 3--metal
X = atomic mass
Y = element
Z = atomic number
X = atomic number
Y = element
Z = atomic mass
X = element
Y = atomic number
Z = atomic mass
A sample of the element of copper is divided into the smallest particles possible such that each particle is still copper. Each particle can best be described as
an atom
a molecule
a nucleus
an electron
metals conduct heat
metals conduct electricity
metals are good insulators
metals combine with nonmetals
An atom can best be described as
the smallest particle that has all the characteristics of a compound.
a charged particle that is similar to a molecule.
a charged particle that is larger than a molecule.
the smallest particle that has all the characteristics of an element.
substance 1
substance 2
substance 3
substance 4
Sodium Na, is in the same group as
Ne
K
Ca
Mg
Oxygen (O) has more protons than chlorine (Cl).
Iron (Fe) has more protons than silver (Ag).
Sodium (Na) has more protons than carbon (C).
Hydrogen (H) has more protons than helium (He).
section 1
section 2
section 3
section 4
18 (8A)
17 (7A)
1 (1A)
2 (2A)
What physical property is characteristic of all the elements in the group located in the rightmost column of the periodic table?
very high melting point
gas state at room temperature
good conductor of electric current
extremely brittle solid at room temperature
Where are the most reactive metals located on the periodic table?
the uppermost complete row of the table
the rows at the bottom of the table connecting two section
the column at the far left side of the table
the second column from the right side of the table
The image shows a model of a substance. How is this substance classified?
element
mixture
compound
atom
