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Chemistry
Q:
Gasoline is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
Crude oil is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
Which nuclide below is most likely to decay by electron capture?
A) B) C) D)
Q:
Which of the following nuclides is most likely to undergo beta decay?
A) B) C) D)
Q:
Which of the following elements would be expected to be particularly stable?
A) B) C) D)
Q:
In addition to a beta particle, what is the other product of beta decay of ?
A) B) C) D)
Q:
Beta decay of 32P produces a beta particle and
A) 28Al.
B) 31P.
C) 32Si.
D) 32S.
Q:
The number of nucleons in a nucleus is
A) 90.
B) 144.
C) 234.
D) 324.
Q:
Identify the chemical symbol of element Q in .
A) Br
B) Hg
C) Pd
D) Se
Q:
How many electrons are in a neutral atom of bromine-81?
A) 1
B) 35
C) 36
D) 81
Q:
What is the element symbol for an atom that has 5 protons and 6 neutrons?
A) B
B) C
C) H
D) Na
Q:
How many protons (p) and neutrons (n) are in an atom of barium-130?
A) 56 p, 74 n
B) 56 p, 130 n
C) 74 p, 56 n
D) 130 p, 56 n
Q:
How many protons (p) and neutrons (n) are in an atom of ?
A) 38 p, 52 n
B) 38 p, 90 n
C) 52 p, 38 n
D) 90 p, 38 n
Q:
Which of the following represent isotopes?
A: [ ] B: [ ] C: [ ] D: [ ]
A) A and B
B) A and C
C) A and D
D) C and D
Q:
Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has
A) an atomic number of 21 and a mass number of 42.
B) an atomic number of 20 and a mass number of 40.
C) 22 neutrons and 20 protons.
D) 22 protons and 20 neutrons.
Q:
Elements A and Q form two compounds, AQ and A2Q3. The mass ratio (mass Q)/(mass A) for AQ is 0. 291. What is the mass ratio (mass Q)/(mass A) for A2Q3?
A) 0. 194
B) 0. 436
C) 2.29
D) 5.15
Q:
A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?
A) 2.27 g
B) 7.70 g
C) 15.0 g
D) 20.5 g
Q:
A sample of pure lithium carbonate contains 18.8.4% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?
A) 9.40%
B) 18.8%
C) 37.6%
D) 75.2%
Q:
Sodium metal and water react to form hydrogen and sodium hydroxide. If 5.98 g of sodium react with water to form 0.26 g of hydrogen and 10.40 g of sodium hydroxide, what mass of water was involved in the reaction?
A) 4.68 g
B) 5.98 g
C) 10.14 g
D) 10.66 g
Q:
Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?
A) 1.8 g
B) 2.2 g
C) 3.7 g
D) 4.0 g
Q:
Which is most likely to form a binary oxide with the formula M4O10 (where M = element A, B, C, or D)?A) element AB) element BC) element CD) element D
Q:
Which is most likely to form a binary oxide with the formula M2O3 (where M = element A, B, C, or D)?
A) element A
B) element B
C) element C
D) element D
Q:
Which is most likely to form a binary oxide with the formula MO3 (where M = element A, B, C, or D)?
A) element A
B) element B
C) element C
D) element D
Q:
Which is most likely to form a binary oxide with the formula MO (where M = element A, B, C, or D)?
A) element A
B) element B
C) element C
D) element D
Q:
In which pair are both formulas of binary fluorides of element D correct?
A) DF2 and DF3
B) DF2 and DF6
C) DF3 and DF5
D) DF5 and DF6
Q:
In which pair are both formulas of binary fluorides of element C correct?
A) CF2 and CF3
B) CF2 and CF6
C) CF3 and CF5
D) CF5 and CF6
Q:
Which is the correct formula of the binary fluoride of element B?
A) BF2
B) BF3
C) BF5
D) BF6
Q:
Which is the correct formula of the binary fluoride of element A?
A) AF2
B) AF3
C) AF5
D) AF6
Q:
Which drawing represents the ionic compound NH4ClO4?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which drawing represents the ionic compound KNO3?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which drawing represents the ionic compound CaCl2?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which drawing represents the ionic compound Na2CO3?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which drawing represents the ionic compound Mg3(PO4)2?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which elements commonly form covalent bonds?
A) A and B
B) A and C
C) B and D
D) C and D
Q:
Which elements commonly form cations?
A) A and B
B) A and C
C) B and D
D) C and D
Q:
Which elements commonly form anions?
A) A and B
B) A and C
C) B and D
D) C and D
Q:
If shaded and unshaded spheres represent atoms of different elements, which of the above drawings most likely represents a molecular compound at room temperature and a pressure of 1 atm?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
If shaded and unshaded spheres represent atoms of different elements, which of the above drawings most likely represents an ionic compound at room temperature and a pressure of 1 atm?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
If shaded and unshaded spheres represent atoms of different elements, which of the above drawings most likely represents a molecular compound at room temperature and a pressure of 1 atm?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
If shaded and unshaded spheres represent atoms of different elements, which of the above drawings most likely represents an ionic compound at room temperature and a pressure of 1 atm?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Give the molecular formula corresponding to the following ball-and-stick molecular representation of naphthalene (gray = C, unshaded = H). In writing the formula, list the atoms in alphabetical order. A) CH
B) C5H4
C) C10H8
D) C10H10
Q:
Give the molecular formula corresponding to the following ball-and-stick molecular representation of vitamin C (ascorbic acid) (gray = C, unshaded = H, black = O). In writing the formula, list the atoms in alphabetical order. A) CHO
B) C3H4O3
C) C6H4O6
D) C6H8O6
Q:
What kind of decay process is occurring in the decay of isotope D to isotope E in the figure shown above?
Q:
What kind of decay process is occurring in the decay of isotope C to isotope D in the figure shown above?
Q:
What kind of decay process is occurring in the decay of isotope B to isotope C in the figure shown above?
Q:
What kind of decay process is occurring in the decay of isotope A to isotope B in the figure shown above?
Q:
Tell the type of decay process occurring in the following nuclear reaction.
Q:
Tell the type of decay process occurring in the following nuclear reaction.
Q:
Tell the type of decay process occurring in the following nuclear reaction.
Q:
Tell the type of decay process occurring in the following nuclear reaction.
Q:
Tell the type of decay process occurring in the following nuclear reaction.
Q:
Tell the type of decay process occurring in the following nuclear reaction.
Q:
Which of the following figures represents ? Unshaded spheres represent neutrons and shaded spheres represent protons. A) figure (1)
B) figure (2)
C) figure (3)
D) figure (4)
Q:
Which of the following figures represents ? Unshaded spheres represent neutrons and shaded spheres represent protons. A) figure (1)
B) figure (2)
C) figure (3)
D) figure (4)
Q:
Which of the following figures represents ? Unshaded spheres represent neutrons and shaded spheres represent protons. A) figure (1)
B) figure (2)
C) figure (3)
D) figure (4)
Q:
If shaded and unshaded spheres represent atoms of different elements, as shown in drawing (1), which combination of drawings (2)-(4) represent the law of multiple proportions? A) only drawings (2) and (3)
B) only drawings (2) and (4)
C) only drawings (3) and (4)
D) drawings (2), (3), and (4)
Q:
If shaded and unshaded spheres represent atoms of different elements, as shown in drawing (1), which drawings (2)-(4) represent the law of multiple proportions? A) only drawings (2) and (3)
B) only drawings (2) and (4)
C) only drawings (3) and (4)
D) drawings (2), (3), and (4)
Q:
If shaded and unshaded spheres represent atoms of different elements, as shown in drawing (1), which drawings (2)-(4) represent the law of multiple proportions? A) only drawings (2) and (3)
B) only drawings (2) and (4)
C) only drawings (3) and (4)
D) drawings (2), (3), and (4)
Q:
If shaded and unshaded spheres represent atoms of different elements, as shown in drawing (1), which drawings (2)-(4) represent the law of multiple proportions? A) only drawings (2) and (3)
B) only drawings (2) and (4)
C) only drawings (3) and (4)
D) drawings (2), (3), and (4)
Q:
If shaded and unshaded spheres represent atoms of different elements, as shown in drawing (1), which drawings (2)-(4) represent the law of multiple proportions? A) only drawings (2) and (3)
B) only drawings (2) and (4)
C) only drawings (3) and (4)
D) drawings (2), (3), and (4)
Q:
Which of the following drawings depicts a chemical reaction consistent with Dalton's atomic theory? A) drawing a)
B) drawing b)
C) drawing c)
D) drawing d)
Q:
Which of the following drawings depicts a chemical reaction consistent with Dalton's atomic theory? A) drawing a)
B) drawing b)
C) drawing c)
D) drawing d)
Q:
Assume that the mixture of substances in drawing (1) undergoes a chemical reaction. Which of the drawings (2)-(4) represents a product mixture that is consistent with the law of mass conservation? A) drawing (2)
B) drawing (3)
C) drawing (4)
Q:
Assume that the mixture of substances in drawing (1) undergoes a chemical reaction. Which of the drawings (2)-(4) represents a product mixture that is consistent with the law of mass conservation? A) drawing (2)
B) drawing (3)
C) drawing (4)
Q:
Which of the above drawings represents a K+ ion?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which of the above drawings represents a Ca2+ ion?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which of the above drawings represents a Cl- ion?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which of the above drawings represents an Ar atom?
A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
If unshaded spheres represent sulfur atoms and shaded spheres represent oxygen atoms, which of the following drawings depicts a collection of sulfur trioxide molecules? A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which of the following drawings represents a collection of acetylene (C2H2) molecules? The shaded spheres represent carbon atoms and the unshaded spheres represent hydrogen atoms. A) drawing (a)
B) drawing (b)
C) drawing (c)
D) drawing (d)
Q:
Which of the above drawings represents a mixture?
A) drawing (a)
B) drawing (b)
C) drawing (c)
Q:
Which of the above drawings represents a pure compound?
A) drawing (a)
B) drawing (b)
C) drawing (c)
Q:
Which of the above drawings represents a pure element?
A) drawing (a)
B) drawing (b)
C) drawing (c)
Q:
What are the names of the ions Ba2+, Sn2+, and Se2-?
A) barium, tin, and selenium
B) barium, tin(II), and selenide
C) barium(II), tin(II), and selenium(II-)
D) barous, stannous, and selenide
Q:
KH2PO4 is
A) hydropotassium phosphate.
B) potassium dihydrogen phosphate.
C) potassium diphosphate.
D) potassium hydrogen(II) phosphate.
Q:
The thiosulfate ion is
A) HS-.
B) HSO42-.
C) SO52-.
D) S2O32-.
Q:
The chemical formula for calcium nitride isA) Ca(NO3)2.B) Ca(NO2)2.C) Ca3N2.D) CaN2.
Q:
The ion NO2- is named
A) nitrate ion.
B) nitrite ion.
C) nitrogen dioxide ion.
D) nitrogen(II) oxide ion.
Q:
The compound, NO2, is named
A) nitrate.
B) nitrite.
C) nitrogen dioxide.
D) nitrogen(IV) oxide.
Q:
The ions ClO4-, ClO3-, ClO2-, and ClO- are named respectively
A) hypochlorate, chlorate, chlorite, perchlorite.
B) hypochlorite, chlorite, chlorate, perchlorate.
C) perchlorate, chlorate, chlorite, hypochlorite.
D) perchlorite, chlorite, chlorate, hypochlorate.