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Cahill midterm
Cahill midterm
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#grade_11 #grade_10 #chemistry
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1
Rutherford’s gold-foil experiment led him to conclude that
Aloha particles were a poor choice for a material
positive charge existed in the atom
Light was emitted by electrons
2
Which is a heterogeneous mixture
Salt
Air
Nitrogen
Mud
3
As electrons add to s and p, they are pulled closer to the nucleus, causing
Atomic radii to decrease in size
Atomic radii to increase in size
Atomic radius explodes
Nucleus to increase in size
4
When 6.02 mc012-1.jpg 10 23 is multiplied by 9.1 mc012-2.jpg 10 -31, the product is
5.5 x 10^67
5.5 x 10^53
5.5 x 10^-7
5.5 x 10^-8
5
Sample of bismuth has a mass of 343g and a volume of 35.0cm^3. What is the density
1.20 x 10^4 g/cm^3
1.20 x 10^4 g/cm^3
.102 g/cm^3
9.80 g/cm^3
6
SI base units for time and temp
Second and degree celsius
Hour and kelvin
Hour and degree celsius
Second and kelvin
7
According to the law of definite proportions, any two samples of KCl will have
different densities
The same mass
same elements in the same proportions by mass
slightly different molecular structures
8
Which of the following changes is a physical change of matter
Paper burning
Nail rusting
Water evaporating
Silver spoon tarnishing
9
What is an example of a nonmetal
Cadmium
Mercury
Phosporus
Copper
10
Which property would be least helpful in determining whether a substance is a metal or nonmetal
Luster
State
Conductivity
Ductility
11
scientists to concluded that cathode rays are composed of
Positive particles
Neutral particles
Negative particles
Doodoo
12
All the alkali metals are found in
Group 1
Group 3
Period 8
Group 7
13
A homogeneous mixture is one that
Is uniform in composition
Contains only one element
Cannot change state easily
Acts as a solvent
14
Which measurements are all the zeros considered to be non sig figs
506mL
0.0037mL
400.mL
60.0mL
15
NOT an SI base unit
Pound
Kelvin
Ampere
Meter
16
0.0265g rounded to two sig figs
0.030g
0.027g
0.026g
0.03g
17
Mass of 3.56mol of glucose (The molar mass of C6 H12 O6 is 180.18 g/mol.)
308g
549mol
102g
641g
18
Which properties are common to elements within a single group on the periodic table
Chemical properties & ability to bond to atoms
Color & luster
Boiling point & freezing point
Atomic weight & number
19
Research carried out for sake of increasing knowledge is
Technological development
None of the above
Applied research
Basic research
20
Which of the following changes is a chemical change of matter
Ice melting to produce water
Vinegar combining with baking soda
Water boiling to produce water vapor
Liquid silica solidifying to form glass
21
a scientist working in a lab, with compounds containing carbon. She is most likely working in
None of the above
Inorganic chemistry
Theoretical chemistry
Organic Chemistry
22
Water boiling at 100C is an example of
Extensive property
Physical property
Chemical property
Chemical change
23
Compared with a mole of lead atoms, a mole of iron atoms
Cannot be determined
Has the same number of atoms
Has fewer atoms
Has more atoms
24
An atom of potassium has 19 protons and 20 neutrons. Its mass number is
20
9
39
19
25
Which of the following is an example of a heterogeneous mixture
Tap water
Orange colored water
Chunky peanut butter
Gold ring
26
An object’s weight is a measure
Force with which it is attracted by gravity
Pressure exerted on a scale
Amount of material per unit volume
Force causing the object to move
27
Scientist working with math & computer models. He is working in
Analytical chemistry
Biochemistry
Physical chemistry
Theoretical chemistry
28
The atomic symbol for beryllium indicates that the
Atomic number is 4
Atomic number is 6
Mass number is 4
Atomic number is 9
29
Which feature of Dalton’s atomic theory is different from modern atomic theory?
Atoms cannot be destroyed
Atoms cannot be subdivided
Atoms cannot be rearranged in chemical reactions
Atoms combine in whole-number ratios
30
For P block elements the total number of electrons is equal to
Group number minus 10
Group number plus 3
Group number plus 9
Group number minus 6
31
Which of the following is an intensive property of matter
Energy content
Volume
Density
Mass
32
Which of the following elements has an electron affinity
Alkali metals
Transition metals
Halogens
Noble gases
33
Mixtures and compound difference
Mixtures are made of two elements or more
Mixtures can be separated by physical processes
Mixtures are heterogeneous
All mixtures have uniform composition
34
Every pure chemical compound consists of two or more elements that
Are combined in any proportion
Can be separated by physical change
Cannot be seperated
Are combined chemically
35
The average atomic mass of an element is
the same as the atomic number of the element
The sum of the number of neutrons and protons
the mass of one isotope of the element
weighted average of all naturally occurring isotopes
36
Which ionization energy is generally the largest
First
Third
Second
Fourth
37
The metalloids are located on the period table between
Doodoo
Where the metalloids are
Metals and nonmetals
Metals and gases
38
Protons are bound together by
Magnetic forces
Electric forces
Gravitational forces
Strong nuclear forces
39
Which of these are qualitative
Chemical reaction is complete in 2.3s
Compound melts at 87.5C
Iron is denser than aluminum
Solid has mass of 23.4g
40
Smallest unit of matter
Mixture
Compound
An atom
Molecule
41
The molecular mass of CO2 is 44.01 amu. What is the mass of 2.0 mol of CO2
88.02g
44.01amu
44.01g
88.02amu
42
Expressed in scientific notation 0.0930m
9.30 x 10^-2m
9.3 x 10^-3
9.30 x 10^-4m
43
Which is a pure substance
Air
Granite
Water
Stainless steel
44
how many moles are in a 35.65 g sample of NaOH? (The molar mass of NaOH is 40.01g/mol)
0.8910mol
1.122mol
7182mol
1426mol
45
Precision is related to all of these except
Range of measurement values
Number of sig figs
Reproducibility
Closeness of a measurement to the accepted value
46
One way to separate the different kinds of matter in a mixture is through
Decomposition
Chemical reactions
Electrolysis
Filtration
47
Horizontal rows in a periodic table
Columns
Group
Period
Family
48
Example of extensive property
Mass
Density
Color
Boiling point
49
Which is an extensive property of matter
Melting point
Density
Volume
Boiling point
50
Units of molar mass
Amu/mol
Mol/g
G/mol
Amu/g
51
A scientist trying to find a safer chemical for industrial purposes is an example of
Basic research
None of the above
Technological development
Applied research
52
SI base unit for mass
Kilogram
Meter
Gram
Cubic meter
53
Noble gases are generally
Malleable
Semiconductors
Brittle
Unreactive
54
An element near argon in the periodic table would probably be
Shiny and malleable
Good electrical conductor
Poor heat conductor
Solid at room temp
55
Example of an element
Oxygen
Sugar
Water
Soil
56
Forming an ion, which sub level would an atom of nickel lose electrons
4s
3d
3s
3p
57
Which process is a chemical change
Slicing into two pieces
Dissolving in alcohol
Heating to boiling
Burning in air
58
Which of the following elements have have full outer energy levels in a ground state
Alkali metals
Halogens
Noble gases
Transition metals
59
Which group contains atoms that have the lowest attraction for electrons
Group 16
Group 19
Group 2
Group 1
60
Number of sig figs in 170.040km
Three
Four
Five
Six
61
Homogeneous mixtures are also called
Molecules
Solutions
Atoms
Compounds
