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AcaDeca Practice 22-23 Science Flashcards | StudBud
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AcaDeca Practice 22-23 Science
AcaDeca Practice 22-23 Science
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1
50. A volumetric method used to quantify the concentration of an acid is called a
titration
neutralization
flame test
redox reaction
2
16. Pure water has a neutral pH. The hydrogen ion concentration [H+ ] in pure water is which of the following?
7.0
1 x 10^-14 M
1 x 10^-7 M
1 x 10^7 M
3
7. The wave-particle duality of matter was resolved by the advent and establishment of which of the following?
classical mechanics
Le Chatlier’s Principle
quantum physics
Nernst equation
4
47. The beta decay of Strontium-90 is BEST described by which of the following equations?
90Sr → 86Kr + 4He
90Sr → 89Rb + e- + ß+
90Sr → 88Se + 2He
90Sr → 90Y + ß-
5
25. All of the following are examples of solutions EXCEPT
tea
copper
lemonade
air
6
35. For the reaction of lithium metal in water, which of the following statements is TRUE?
Lithium gains an electron from water.
Lithium becomes oxidized in the reaction.
The solution will become acidic.
Lithium metal has a +1 oxidation number
7
46. A cation is acidic, if it
is the conjugate acid of a weak base
is the conjugate base of a weak acid
is the conjugate base of a strong acid
has a high negative charge
8
5. Hess’s law is useful for doing which of the following?
Calculating the entropy change of a reaction that cant be measured directly
Predicting the temperature of a reaction based on the rate of the reaction
Calculating the enthalpychange of a reaction that cant be measured directly
Predicting the reaction pathway based on the enthalpy change
9
4. Which description BEST explains the bonding present in sodium chloride (NaCl)?
Cl transfers one electron to Na to form an ionic bond.
Na and Cl each share two electrons to form a double covalent bond.
Na and Cl each share one electron to form a single covalent bond.
Na transfers one electron to Cl to form an ionic bond.
10
26. Chemists originally determined atomic masses by measuring
protons
protons and neutrons
neutrons
a large number of identical atoms simultaneously
11
8. The number of moles of solute dissolved in 1.0 kg of solvent is equal to which of the following?
molarity
mole fraction
molality
molar mass
12
39. Orbital names, such as s and p, are used to designate
size
shape
origin
color
13
1. If methane reacts with oxygen to produce carbon dioxide, water, and energy, what type of reaction is occurring?
double replacement
synthesis
combustion
decomposition
14
21. What is the molar mass of ammonia (NH3)?
17 g
4 g
14 g
10 g
15
48. Walter Nernst was known for
developing experiments that led to the principle of conservation of mass
explaining the mechanism behind catalysis
theorizing that electrons orbit the nucleus in circular orbits
developing an equation that connects cell potentials to free energy changes
16
23. For the following reaction, select a correct half reaction from the options below. Cu + Ag+ → Cu2+ + Ag
Cu + 1e - → Cu2+
Ag+ + 1e - → Ag
Ag0 → Ag+ + 1e -
Cu → Cu+ + 1e
17
42. The “luster” of metals is MOST closely associated with its
evenness
compactness
lattice shape
reflectivity
18
22. Compared to a polar molecule, a nonpolar molecule of similar molecular weight will
have a higher boiling point and a lower melting point
have a lower boiling point and a higher melting point
have a lower boiling point and a higher critical point
have a lower boiling point and a lower melting point
19
The branch of chemistry that uses redox reactions in many types of useful processes, such as chrome plating, is called
physical chemistry
nucelar chemistry
electrochemistry
thermochemistry
20
44. When a catalyst is added to a reaction system, which of the following occurs?
The activation energy increases and the heat of reaction decreases.
The activation energy decreases and speed up the reactions.
The activation energy decreases and the slows downs the reactions.
The activation energy remains the same and the heat of reaction decreases.
21
43. Which allotrope of pure carbon is known to be a good conductor of heat and electricity?
amorphous carbon
graphite
Lonsdaleite
diamond
22
49. Stoichiometry is used both to predict the yield of reactions and to determine
limiting reagents
end points
reversibility
equilibrium points
23
The model of the atom in which electrons occupy stationary orbits around the central + charged nucleus is called the
Rutherford model
Thomson model
Einstein model
Bohr model
24
3. Positron decay is the process by which a radioactive isotope
transforms an electron into a proton, while emitting other particles
transforms a neutron into a proton while emitting other particles
emits a helium nucleus
transforms a proton into a neutron, while emitting other particles
25
34. In calculations of Gibbs Free Energy, if the ΔGrxn value is negative, the reaction will
be reversible
not occur spontaneously
be at equilibrium
occur spontaneously
26
6. In a classical galvanic electrochemical cell, which statement is correct?
The anode is where reduction occurs.
The cathode is where oxidation occurs
The anode is where oxidation occurs.
There is no charge associated with electrochemical cells.
27
40. Amedeo Avogadro theorized that if the temperature and pressure are known, the volume of gas
is directly proportional to the temperature of the container
cannot be determined
is inversely proportional to the number of atoms in that gas
is directly proportional to the number of atoms in that gas
28
10. How are Brønsted-Lowry bases defined?
They are OH- donors in a reaction
They are H+ acceptors in a reaction
They are OH- acceptors in a reaction
They are H+ donors in a reaction
29
19. Which of the following solvents would dissolve the greatest amount of glucose?
C6H14
H2O
CCl4
C6H6
30
45. The structure of DNA can BEST be explained by which statement?
DNA is a single stranded helix stabilized by phosphodiester bonds.
DNA is a double stranded helix stabilized by salt bridges.
DNA is a single stranded helix stabilized by complementary base pairs.
DNA is a double stranded helix stabilized by hydrogen bonds
31
31. What is the oxidation number for chromium in H2Cr2O7?
+6
+2
+8
-2
32
30. The kinetic molecular theory is primarily concerned with
static forces
moving particles
chemical bonding
physical properties
33
9. The amount of energy change that occurs, when an electron is added to a neutral atom
to form a negative ion, is the ionization energy
to form a negative ion, is the electron affinity
to form a positive ion, is the electron affinity
to form a positive ion, is the ionization energy
34
14. All of the following are advantages of reverse osmosis over distillation EXCEPT
reverse osmosis also has purer water output
reverse osmosis requires less pretreatment needed
reverse osmosis has lower energy needs
reverse osmosis has a lower discharge water temperature
35
11. How is activation energy defined?
the energy required to remove an electron from an atom
the energy that is produced by an electrochemical cell
the energy required for molecules to convert between reactants and products
the energy released when an electron is added to an atom
36
The Boltzmann constant, which is equal to 1.380649×10-23J∙K-1 . is an expression of the ideal gas constant in units of
kinetic energy and pressure
kinetic energy and absolute temperature
pressure and absolute temperature
absolute temperature and volume
37
38. In order for a mass spectrometer to measure the masses of atoms, the atoms must be
charged
reduced
polarized
radioactive
38
13. The very tight structure of metals causes them to have all of the following properties EXCEPT
good conductors of electricity
ductile
sonorous
poor conductors of heat
39
17. What is radioactive decay?
atomic species transmutating into a new species
stable elements spontaneously transforming into different elements
unstable elements spontaneously emitting radio waves
the diminishing intensity of a radio wave signal
40
24. In a chemical equation, which of the following is TRUE?
An arrow means “yields” or “to make”.
States of matter are not listed.
Reactants are listed on the right.
There will always be more than one reactant.
