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