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District Assessment IV
District Assessment IV
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1
A horizontal row in the periodic table is called a(n)
Octet
Period
Family
Group
2
The halogens are located on the periodic table in group
1
17
18
2
3
Whenever an excited hydrogen atom returns from an excited state to its ground state, it
Emits a photon of radiation
Emits radiation over a range of frequencies
Absorbs specific frequencies of light
Absorbs a photon of radiation
4
Which of the following is an example of a heterogeneous mixture?
tap water
chunky peanut butter
gold ring
orange colored water
5
The theory that light behaves as a wave is best illustrated by the
Lyman, Balmer and Paschen Series
Photoelectric effect
Emission of electromagnetic radiation by a hot body
Interference of light
6
The word atom means
Energetic
Indivisible
Indestructible
Charged
7
The number of valence electrons for group 2 elements is
n-1
equal to the period number
2
8
8
Theories are considered successful only if they
Can be stated in simple terms
Can be written in the form of an equation
Can be used to make accurate predictions
Have been accepted by all scientists
9
Electrons that move freely throughout the entire lattice of atoms is called ____ bond.
Covalent
Multiple
Metallic
Ionic
10
The branch of chemistry in which the compositions of materials are identified is known as
Physical chemistry
Analytical chemistry
biochemistry
Organic chemistry
11
The ancient greek natural philosopher who first proposed the notion of the atom was
Aristotle
Socrates
Democritus
Plato
12
Which of these terms best describes the statement "A solution of the unknown compound turned the litmus paper blue."
Quantitative Observation
Qualitative Observation
Model
Hypothesis
13
Which of these does the angular momentum quantum number indicate?
The shape of an oribtal
The orientation of an orbital around the nucleus
The Spin state of an electron in an orbital
The main energy level of an electron
14
Mendeleev did not list all of the elements in order of increasing atomic mass because he wanted to group together
Charges
Isotopes
Atomic Numbers
Properties
15
The molar mass of an element is numerically equal to
the element's average atomic mass
The percentage composition of the element by mass
The number of electrons possessed by an element
The element's average atomic number
16
Which of the formula listed below represents a polyatomic ion?
Cl-
H2SO4
HCO3-
Na+
17
The SI base unit for length is the
cubic centimeter
liter
gram
meter
18
Which of these statements is true of the scientific method?
Scientists rarely publish results of experiments
Working scientists rarely use it
Scientists must follow its steps exactly
The steps may vary somewhat to suit the experiment
19
Which of these recorded observations is qualitative, rather than quantitative?
Iron is denser than aluminum
The compound melts at 87.5 Celsius
A chemical reaction is complete in 2.3 s
A solid has a mass of 23.4 g
20
A covalent bond is formed when two atoms
Share one or more pairs of electrons with each other
Gains electrons
Share an electron with each other
Loses electrons
21
The least massive particle in an atom is the
Proton
Electron
Neutron
None of the above
22
What is the correct electron configuration for a neutral atom with 7 electrons?
1s2 2s5
1s2 2s2 2p3
1s2 2s2 2p2 3s1
1s2 2s3 2p2
23
Every pure chemical compound consists of two or more elements that
Are combined in any proportion
are combined chemically
Can not be seperated
can be separated by a physical change
24
The atomic symbol for beryllium, Be
4
9
, indicates that the
atomic number equals 9
atomic number is 4
atomic number is 9
mass number is 4
25
Chemistry is a natural science that deals with the study of
The composition, structure, properties, and changes of matter
living things and their life processes
The physical features of Earth
The composition, motion, and relative positions of stars and planets
26
Compared with a mole of lead atoms, a mole of iron atoms
has the same number of atoms
can not be determined because iron is magnetic
has more atoms
has fewer atoms
27
In division and multiplication, the answer should have the same number of significant figures as the
Total number of significant figures in the calculation.
Number in the calculation with the most significant figures
Average number of significant figures in the calculation
Number in the calculation with the fewest significant figures
28
For each successive electron removed from an atom, the ionization energy
Increases
Decreases
Remains the same
Equals the nuclear charge
29
The force acting on a certain area is called
diffusion
Effusion
Pressure
Velocity
30
Neutral atoms contain equal numbers of
electrons and neutrons
protons, electrons, and neutrons
Protons and electrons
Protons and neutrons
31
Which of the periodic group or family of elements is NOT correctly matched with its name?
Group 2: Alkaline-earth metals
Group 17: Halogens
Group 3: Alkali Metal
Group 18: Noble Gases
32
What is the atomic number of the element with the noble-gas notation [Kr] 5s
1
35
36
37
38
33
Which of the following changes is a physical change of matter?
Paper burning
Water evaporating
A nail rusting
A silver spoon tarnishing
34
In the reaction described by the wood equation (sodium + water -> sodium hydroxide + hydrogen gas)
Sodium hydroxide is a reactant
Hydrogen Gas is a reactant
Sodium hydroxide is a product
Sodium is a product
35
Which of the following elements is most similar in behavior to calcium?
Chlorine
Sulfur
Magnesium
Sodium
36
The lowest energy state of an atom is its
Ground State
Highest occupied energy level
Electron Configuration
Principle quantum number
37
Which of these statements about density is true?
Density is expressed in units of mL/cm3
Density does not change with temperature
Density is proportional to the amount of a substance
Density may be used to help identify a material.
38
To calculate the number of atoms present in 2.0 mol of an element, you would
Divide avogadro's number of atoms per mole to 2.0 mole
Subtract avogadro's number of atoms per mole to 2.0 mole
Add avogadro's number of atoms per mole to 2.0 mole
Multiply avogadro's number of atoms per mole to 2.0 mole
39
The ____ states matter can not be created or destroyed.
Law of conservation of matter
Boyle's law
Dalton's theory
Charles' Law
40
Which of the following elements is a transition metal?
Calcium
Sulfur
Sodium
Iron
41
The charge of an ion is
Always Negative
Zero
Either positive or negative
Always Positive
42
According to the octect rule, a calcium atom has a tendency to
gain one electron
lose one electron
lose two electrons
gain two electrons
43
Which of these is an example of an extensive property?
Color
Boiling Point
Mass
Density
44
According to VSEPR theory, what is the shape of a molecule of CS
2
?
Tetrahedral
Linear
Trigonal Planar
Bent
45
The smallest unit of matter that retains the properties of that matter is
A molecule
An atom
A mixture
A compound
