Atoms and Molecules Flashcards
The symbols for elements with accepted names
Select one:
a. consist of a single capital letter.
b. consist of a capital and a small letter.
c. consist of either a single capital letter or a capital letter and a small letter.
c. consist of either a single capital letter or a capital letter and a small letter.
A molecular formula
Select one:
a. is represented by the symbols of the elements in the formula.
b. is represented by a system of circles that contain different symbols.
c. cannot be represented conveniently using symbols for the elements.
d. is represented using words rather than symbols.
a. is represented by the symbols of the elements in the formula.
What is meant when the symbol C-12 is used?
Select one:
a. the carbon atom weighs 12 grams
b. the carbon atom weights 12 pounds
c. the carbon atom weighs 12 amu
d. the melting point of carbon is 12oC
c. the carbon atom weighs 12 amu
Refer to a periodic table and tell how many helium atoms (He) would be needed to get close to the same mass as an average oxygen atom (O).
Select one:
a. six
b. four
c. twelve
d. one-fourth
b. four
Which of the following pairs are about equal in mass?
Select one:
a. proton and electron
b. electron and neutron
c. proton and neutron
d. nucleus and surrounding electrons
c. proton and neutron
Which of the following carries a negative charge?
Select one:
a. protons
b. neutrons
c. electrons
d. nucleus
c. electrons
Which of the following is located in the nucleus of an atom?
Select one:
a. protons
b. neutrons
c. electrons
d. both protons and neutrons
d. both protons and neutrons
Determine the molecular weight of hydrogen peroxide, H2O2, in u.
Select one:
a. 17.01
b. 18.02
c. 34.02
d. 33.01
c. 34.02
Using whole numbers, determine the molecular weight of calcium hydroxide, Ca(OH)2.
Select one:
a. 56
b. 57
c. 58
d. 74
d. 74
Atoms that have the same atomic number but differ by mass number are called
Select one:
a. protons.
b. neutrons.
c. isotopes.
d. positrons.
c. isotopes.
Atoms are neutral. How can they have no charge?
Select one:
a. equal numbers of protons and neutrons
b. equal numbers of protons and electrons
c. equal numbers of neutrons and electrons
d. any charge has been drained out of the atom
b. equal numbers of protons and electrons
How many protons are found in the nucleus of a boron-11 (B) atom?
Select one:
a. 11
b. 6
c. 5
d. 4
c. 5
What is the mass number of a carbon-13 (C) atom?
Select one:
a. 13
b. 12
c. 6
d. 7
a. 13
What mass of arsenic (As) in grams contains the same number of atoms as 39.95 g of argon (Ar)?
Select one:
a. 33.0
b. 74.92
c. 4.16
d. 149.84
b. 74.92
The formula for dinitrogen monoxide is N2O. If a sample of the oxide was found to contain 0.0800 g of oxygen, how many grams of nitrogen would it contain?
Select one:
a. 0.140
b. 0.280
c. 0.560
d. 0.0700
a. 0.140
How many neutrons are found in the nucleus of a boron -11 (B) atom?
Select one:
a. 11
b. 6
c. 5
d. 4
b. 6
Naturally occurring neon (Ne) has the following isotopic composition (the mass of each isotope is given in parentheses). Calculate the atomic weight of neon in amu from these data. Neon-20, 90.92% (19.99 amu); neon-21, 0.257% (20.99 amu); neon-22, 8.82% (21.99 amu).
Select one:
a. 28.97
b. 37.62
c. 2017
d. 20.17
d. 20.17
The formula of nitrous oxide is N2O. If a sample of the oxide was found to contain 0.800 g of oxygen, how many grams of nitrogen would it contain?
Select one:
a. 0.140
b. 0.280
c. 0.560
d. 0.0700
a. 0.140
Avogadro’s number of iron (Fe) atoms would weigh
Select one:
a. 55.9 g
b. 27.9 g
c. 6.02 X 10^23 g
d. 6.02 X 10^-23 g
a. 55.9 g
How many nitrogen atoms are in one mole of N2O? Select one: a. 1 b. 2 c. 6.02 x 10^23 d. 12.04 x 10^23
d. 12.04 x 1023
How many moles of oxygen atoms are in one mole of CO2?
Select one:
a. 1
b. 2
c. 6.02 X 10^23
d. 12.04 X 10^23
b. 2
How many hydrogen atoms are in 1.00 mole of NH3?
Select one:
a. 3
b. 6.02 X 10^23
c. 12.04 X 10^23
d. 18.06 X 10^23
d. 18.06 X 1023
How many moles of hydrogen molecules (H2) would be required to produce two moles of hydrogen peroxide (H2O2)?
Select one:
a. 1
b. 2
c. 3
d. 4
b. 2
Calculate the weight percentage of hydrogen in water.
Select one:
a. 33.3
b. 66.7
c. 2.00
d. 11.1
d. 11.1
The weight % of S in K2SO4 is
Select one:
a. 14.2%
b. 18.4%
c. 54.4%
d. 22.4%
b. 18.4%
Which of the following elements is found in the same periodic table period as Sn?
Select one:
a. Si
b. As
c. Te
d. Dy
c. Te
Which element is the first one in group IVA of the periodic table?
Select one:
a. C
b. Na
c. Sc
d. Ti
a. C
What is the symbol of the element that is in Period 4 and Group IIA of the periodic table?
Select one:
a. Zn
b. Ca
c. C
d. Ti
b. Ca
Silver, Ag, belongs to what period of the periodic table?
Select one:
a. IB
b. 2
c. 5
d. 12
c. 5
Which of the following choices is a possible designation for an electron that occupies a volume around the nucleus that has the given shape? (CLOVER)
Select one:
a. 2p
b. 3s
c. 3d
d. 4f
c. 3d
Which of the following subshells has the higher energy?
Select one:
a. 4s
b. 4p
c. 4d
d. 4f
d. 4f
The total number of f orbitals in an f subshell is
Select one:
a. 2.
b. 11.
c. 7.
d. 10.
c. 7.
The maximum number of electrons that can occupy a 3d subshell is
Select one:
a. 2.
b. 4.
c. 6.
d. 10.
d. 10.
The maximum number of electrons that can occupy a 4p subshell is
Select one:
a. 2.
b. 4.
c. 6.
d. 10.
c. 6.
What is the maximum number of electrons that can occupy the third shell?
Select one:
a. 2
b. 10
c. 18
d. 32
c. 18
Which of the following elements should have properties similar to those of nitrogen (element 7)?
Select one:
a. C
b. Si
c. P
d. O
c. P
Which of the following has the same number of outer shell electrons as sulfur, S?
Select one:
a. C
b. O
c. N
d. F
b. O
Which of the following pairs have the same number of electrons in the outermost shell?
Select one:
a. K and Ca
b. S4+ and Al3+
c. Na+ and Ne
d. Ne and He
c. Na+ and Ne
The melting point of oxygen is __________ selenium, Se.
Select one:
a. lower than
b. higher than
c. equal to
d. inverted from
a. lower than
What is the n value for the outer shell electrons of bromine, Br?
Select one:
a. 4
b. 3
c. 5
d. 6
a. 4
Which of the following elements has an electronic configuration of 1s2 2s2 2p6 3s2 3p1?
Select one:
a. F
b. Al
c. Mg
d. Ga
b. Al
The total number of unpaired electrons in silicon (Si) is
Select one:
a. 0
b. 1
c. 2
d. 3
c. 2
Which of the following contains the same total number of unpaired electrons as potassium (K)?
Select one:
a. Sc
b. Cl
c. Mg
d. More than one response is correct
d. More than one response is correct
The electronic configuration of element 15 ends with
Select one:
a. 2p3
b. 3p5
c. 2p5
d. 3p3
d. 3p3
How many electrons are in the outer shell of element 15?
Select one:
a. 5
b. 3
c. 15
d. 2
a. 5
What type of electron is the distinguishing electron is S?
Select one:
a. s
b. p
c. d
d. f
b. p
Which of the following distinguishing electrons represents an element with the properties similar to an element with a 3p3 distinguishing electron?
Select one:
a. 4p3
b. 3p2
c. 3d3
d. 2p2
a. 4p3
Which element is represented by the distinguishing electron configuration 5d9?
Select one:
a. Pd
b. Ag
c. Pt
d. Au
d. Au
Which of the following elements is most likely to be a metalloid?
Select one:
a. Ge
b. Mo
c. S
d. Cs
a. Ge
