WGU D425 INTRODUCTION TO CHEMISTRY
107 QUESTIONS AND SOLUTIONS
◉ how many millimeters are in 34 meters.
Answer: 1000mm=1m
34,000 meters
◉ talia prepares a bowl of cereal with milk. when she starts to eat
the cereal, she immediately spits it out because the milk has turned
sour. which property change is the souring of milk an example of.
Answer: chemical change
◉ the mass of a ball is 141kg. what is its mass in ounces, given 1 oz=
28.35g.
Answer: 1000kg = 1g 28.35g= 1oz
4.97x10^3 oz.
◉ an irregular shaped metal object of mass 80.4g is placed in a
granulated cylinder containing 500.5ml of water. the water level
increases to 512.5ml. what is the density of this metal.
Answer: 6.70 g/mL
,◉ what is the mass number of an atom containing 17 protons, 18
electrons, and 20 neutrons.
Answer: 37
◉ naturally occurring boron (B) is composed of 19.9% of B-
10(10.013amu) and 80.1% of B-11 (11.009amu) what is the average
atomic mass of boron?.
Answer: 10.81 amu
◉ naturally occurring iridium (Ir) is composed of 37.30% of Ir-
191(190.96amu) and 62.70% of Ir-193(192.96amu).
Answer: 192.2 amu
◉ what does a neutral atom with an atomic number greater than
two consist of?.
Answer: protons, neutrons, and electrons
◉ Given the periodic table what is the relationship btwn electron
negativity and atomic number for halogen group 17.
Answer: Electronegativity decreases from top to bottom
◉ given the periodic table what is the relationship btwn the atomic
radius and atomic number for the period 6 elements.
, Answer: atomic size gradually decreases from left to right across a
period
◉ how many valence electrons are in sulfur (S).
Answer: 6. elements in group 16 have 6 valence electrons
◉ sodium has 11 electrons. which shell would contain the valence
electrons of sodium (Na).
Answer: 3rd shell. 1st shell holds 2 electrons(duet). next shell holds
8 electrons(duet). 3rd shell will hold the single valence electron
◉ what is the definition of an ion.
Answer: at atom or a group of atoms that carries an electrical charge
◉ how many electrons are present in a double bond.
Answer: 4. double bond contains 2 bonds. each bond has 2 electrons
◉ which of these compounds is most likely to contain an ionic bond
N2O, NaF, H2O, C6H6.
Answer: NaF. an ionic compound. bond btwn a metal(Na) and
nonmetal(F)
◉ Calculate the charge of iron ion in FeCl2.
107 QUESTIONS AND SOLUTIONS
◉ how many millimeters are in 34 meters.
Answer: 1000mm=1m
34,000 meters
◉ talia prepares a bowl of cereal with milk. when she starts to eat
the cereal, she immediately spits it out because the milk has turned
sour. which property change is the souring of milk an example of.
Answer: chemical change
◉ the mass of a ball is 141kg. what is its mass in ounces, given 1 oz=
28.35g.
Answer: 1000kg = 1g 28.35g= 1oz
4.97x10^3 oz.
◉ an irregular shaped metal object of mass 80.4g is placed in a
granulated cylinder containing 500.5ml of water. the water level
increases to 512.5ml. what is the density of this metal.
Answer: 6.70 g/mL
,◉ what is the mass number of an atom containing 17 protons, 18
electrons, and 20 neutrons.
Answer: 37
◉ naturally occurring boron (B) is composed of 19.9% of B-
10(10.013amu) and 80.1% of B-11 (11.009amu) what is the average
atomic mass of boron?.
Answer: 10.81 amu
◉ naturally occurring iridium (Ir) is composed of 37.30% of Ir-
191(190.96amu) and 62.70% of Ir-193(192.96amu).
Answer: 192.2 amu
◉ what does a neutral atom with an atomic number greater than
two consist of?.
Answer: protons, neutrons, and electrons
◉ Given the periodic table what is the relationship btwn electron
negativity and atomic number for halogen group 17.
Answer: Electronegativity decreases from top to bottom
◉ given the periodic table what is the relationship btwn the atomic
radius and atomic number for the period 6 elements.
, Answer: atomic size gradually decreases from left to right across a
period
◉ how many valence electrons are in sulfur (S).
Answer: 6. elements in group 16 have 6 valence electrons
◉ sodium has 11 electrons. which shell would contain the valence
electrons of sodium (Na).
Answer: 3rd shell. 1st shell holds 2 electrons(duet). next shell holds
8 electrons(duet). 3rd shell will hold the single valence electron
◉ what is the definition of an ion.
Answer: at atom or a group of atoms that carries an electrical charge
◉ how many electrons are present in a double bond.
Answer: 4. double bond contains 2 bonds. each bond has 2 electrons
◉ which of these compounds is most likely to contain an ionic bond
N2O, NaF, H2O, C6H6.
Answer: NaF. an ionic compound. bond btwn a metal(Na) and
nonmetal(F)
◉ Calculate the charge of iron ion in FeCl2.
