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Unit 7 Lessons 1,2,3 Test Review Flashcards | StudBud
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Unit 7 Lessons 1,2,3 Test Review
Unit 7 Lessons 1,2,3 Test Review
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1
Think about a wooden chair and a balloon. What do these two objects always have in common?
A. Both are made of atoms.
C. Both are made of the same kind of atom.
D. Both are made of the same number of atoms.
B. Both have the same mass number.
2
The periodic table is arranged in columns and rows. What are the columns and the rows of the periodic table called?
D. groups and atomic numbers
C. atomic numbers and periods
A. periods and energy levels
B. groups and periods
3
Tearing paper into pieces is an example of what kind of change?
C. a chemical change
A. a change in mass
D. a change in energy
B. a physical change
4
Which of these statements describes a fact about an electron cloud?
B. It is made up of electrons and neutrons.
A. It is the most massive part of an atom.
D. It is located in the center of an atom’s nucleus.
C. It is where an atom’s electrons are found.
5
Which observation is a sign of a chemical change?
D. A plaster statue breaks when it falls onto the floor.
B. A melting block of ice leaves a large puddle.
C. A cloud changes shape when blown by wind.
A. A rotting potato gives off a bad smell.
6
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
C. 210
B. 125
D. 295
A. 85
7
Which label points to the part of the atom that has a neutral charge?
D
B
C
A
8
If he uses a basketball for a proton, which object would best represent an electron?
C. a soccer ball
B. a beach ball
A. a pea
D. a bowling ball
9
The diagram shows a portion of the periodic table. What makes the shaded elements unique?
D. They can be made in a laboratory only.
C. They do not react with other elements.
A. They are metalloids.
B. They are gases at all temperatures.
10
Which of the following types of changes does NOT observe the law of conservation of mass?
D. physical changes and chemical changes
C. only chemical changes
A. only nuclear changes
B. only physical changes
11
An atom of the element gallium (Ga) has 31 protons and 39 neutrons. What is the atomic number of gallium?
D. 70
A. 8
C. 39
B. 31
12
How is the current model different from Thompson's and Rutherford's model?
A. Electrons move only in the current model of the atom.
C. Electrons travel in orbits only in the current model of the atom.
D. Electrons travel in an electron cloud only in the current model of the a
B. Electrons are fixed only in the current model of the atom.
13
How does the electron cloud model differ from the Bohr model?
D. The cloud shows that all the electrons combine together to form one mass
C. The electron cloud shows a region in which electrons are likely to be fo
A.The electron cloud shows there is not empty space in an atom.
B. The electron cloud shows that electrons do not have a negative charge.
14
Which process is an example of a chemical change?
D. a piece of wood shrinking as it dries out
A. steam rising from a boiling pot of soup
C. alcohol evaporating from a cotton swab
B. a metal railing rusting in damp weather
15
What is the smallest particle of calcium that has all the chemical properties of calcium?
D. a molecule that contains calcium
C. an electron from a calcium atom
B. a proton from a calcium atom
A. an atom of calcium
16
Which types of changes observe the law of conservation of mass?
A. only changes of state
B. only physical changes
D. physical changes and chemical changes
C. only chemical changes
17
Which of these is the smallest particle to retain the properties of an element?
B. a proton
A. an atom
C. a molecule
D. an electron
18
The diagram below is one model of an atom. By whom was this model of an atom proposed?
C. Rutherford
D. Bohr
A. Thompson
B. Dalton
19
In the periodic table below, find the element with the average atomic mass of 87.62
A. Rb
D. Y
C. Sr
B. Sc
20
What information is in this square of the periodic table, from top to bottom?
B. atomic number, chemical symbol, chemical name, average atomic mass
C. average atomic mass, chemical symbol, chemical name, proton number
A. average atomic mass, chemical symbol, chemical name, atomic number
21
Which label points to the part of the atom that has a negative charge?
D
C
A
B
22
Which of these statements describes a fact about an electron cloud?
D. It is located in the center of an atom’s nucleus.
C. It is where an atom’s electrons are found.
A. It is the most massive part of an atom.
B. It is made up of electrons and neutrons.
23
The periodic table has a lot of information in the form of letters and numbers. What does each box represent?
A. a group
C. an element
B. a period
D. a compound
24
Which of the following are the building blocks of atoms?
C. pure substances
B. molecules
A. elements
D. subatomic particles
25
The toast turns black. What caused this chemical change to go too far?
D. an increase in temperature
A.the type of bread
B. the size of the bread
C. a decrease in temperature
26
Which statement is supported by the atomic theory?
C. Atoms are easily destroyed when matter is cooled or heated.
B. Atoms are made up of smaller particles called molecules.
A. Atoms combine to make all the substances on Earth.
D. Atoms come in different sizes, but most are visible using a simple hand
27
What is true about the position of all metals in the periodic table?
A. They are in the first group.
B. They are in the bottom period.
C. They are in the rightmost column.
D. They are to the left of the zigzag line.
28
Which group lists the parts of an atom from the most massive to the least massive?
D. nucleus, proton, electron
B. nucleus, electron, proton
A. proton, nucleus, electron
C. electron, nucleus, proton
