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Review 3 Q Questions From Jan 2017
Test Description: Ludwig #3
Instructions: Answer all questions to get your test result.
1) Which term identifies the most probable location of an electron in the wave-mechanical model of the atom?
A
(l) anode
B
(2) orbital
C
(3) nucleus
D
(4) cathode
2) Which group on the Periodic Table has two elements that exist as gases at STP?
A
(3) Group 16
B
(2) Group 2
C
(4) Group 17
D
(1) Group 1
3) What is the charge of the nucleus of a copper atom ?
A
(3) +29
B
(1) +1
C
(4) +64
D
(2) +2
4) At STP, O2(g) and O3(g) have different properties because O3(g) has
A
(2) more protons per atom than in O2(g)
B
(3) molecules with a different structure than in O2(g
C
(l) more dense nuclei than in O2(g)
D
4) molecules with fewer covalent bonds than in O2(g)
5) A compound is a substance composed of two or more elements that are
A
(3) chemically combined in a fixed proportion
B
(l) physically mixed in a fixed proportion
C
(2) physically mixed in a variable proportion
D
(4) chemically combined in a variable proportion
6) How many pairs of electrons are shared between the nitrogen atoms in a molecule of N2
A
(2) 2
B
(3) 3
C
(4) 6
D
(1) 5
7) A molecule must be nonpolar if the molecule
A
(2) is neutral
B
(1) is linear
C
(4) has a symmetrical charge distribution
D
(3) has an Asymmetrical charge distribution
8) In a chemical reaction, a catalyst provides an alternate reaction pathway that
A
(4) has a higher activation energy
B
(3) has a lower activation energy
C
(2) increases the concentration of the reactants
D
(1) decreases the concentration of the products
9) Which sample of matter represents a mixture?
A
(1) aqueous
B
(3) liquid
C
(2) gaseous
D
(4) solid
10) Which term represents an intermolecular force in a sample of water
A
(4) ionic bonding
B
(1) hydrogen bonding
C
(2) covalent bonding
D
(3) metallic bonding
11) Which term is defined as a measure of the randomness of a
A
(1) heat
B
(4) temperature
C
(2) entropy
D
(3) pressure
12) Which general trends in atomic radius and electronegativity are observed as the elements in Period 3 are considered in order of increasing atomic number?
A
Atomic radius decreases and electronegativity increases.
B
Both atomic radius and electronegativity decrease.
C
Atomic radius increases and electronegativity decreases
D
Both atomic radius and electronegativity increase
13) What is the chemical name for Na2SO3?
A
(1) sodium sulfite
B
(3) sodium sulfide
C
(2) sodium sulfate
D
(4) sodium thiosulfate
14) Based on Table F, which compound is least soluble in water?
A
(1) AlPO4
B
4) AgNO3
C
(2) Li2SO4
D
(3) Ca(OH)2
15) How many joules of heat are absorbed to raise the temperature of 10 grams of water at 1 atm from 25°C to 35.°C?
A
(2) 41.8
B
(1) 4.18
C
(4) 4180
D
(3) 418
16) Which change in the H+ ion concentration of an aqueous solution represents a decrease of one unit on the pH scale?
A
(2) a tenfold decrease
B
(4) a hundredfold decrease
C
(1) a hundredfold increase
D
(3) a tenfold increase
17) The stability of an isotope is related to its ratio of
A
neutrons to positrons
B
neutrons to protons
C
electrons to positrons
D
electrons to neutrons
18) The energy released during a nuclear reaction is from
A
mass being converted to energy
B
energy being converted to mass
C
breaking chemical bonds
D
forming chemical bonds
19) An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity?(difference in electronnegitivity)
A
nitrogen
B
fluorine
C
oxygen
D
carbon
20) Carbon monoxide and carbon dioxide have
A
the same chemical properties and the same physical properties
B
the same chemical properties and different physical properties
C
different chemical properties and the same physical properties
D
different chemical properties and different physical properties
*select an answer for all questions
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