A 5.0-g particle moving 60 m/s collides with a 2.0-g particle initially at rest. After the collision each of the particles has a velocity that is directed 30 from the original direction of motion of the 5.0-g particle. What is the speed of the 2.0-g particle after the collision?
a. 72 m/s
b. 87 m/s
c. 79 m/s
d. 94 m/s
e. 67 m/s
[Ques. 2] When metals become ions, they tend to
a)share their valence electrons.
b)gain more electrons in their valence shells.
c) lose electrons from their valence shells.
d) keep their valence electrons as they were, but
add protons to their nuclei.
[Ques. 3] A 6.0-kg object, initially at rest in free space, explodes into three segments of equal mass. Two of these segments are observed to be moving with equal speeds of 20 m/s with an angle of 60 between their directions of motion. How much kinetic energy is released in this explosion?
a. 2.4 kJ
b. 2.9 kJ
c. 2.0 kJ
d. 3.4 kJ
e. 1.2 kJ
[Ques. 4] Ionic compounds form because the valence
electrons are
a) shared between the atoms.
b) all transferred to one of the two atoms.
c) completely removed from all atoms involved in the bonding process.
d) transferred from an atom of one element to an atom of another element.
[Ques. 5] In the chemistry chapters presented in your
textbook, AM refers to?
a) the average mass of all elements taking part in a given reaction.
b) the atomic mass of a particular element.
c) the total mass present after a reaction has occurred.
d) the time during the day prior to 12 o'clock noon.
[Ques. 6] A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30 from its initial direction of motion. What is the y component of the velocity of the 1.0-kg object just after the collision?
a. 3.7 m/s
b. 3.4 m/s
c. 1.5 m/s
d. 2.4 m/s
e. 4.1 m/s
[Ques. 7] Which of the following is
not one of the postulates
proposed by Dalton in his atomic theory?
a) No atoms are gained, lost, or changed in identity
during a chemical reaction.
b) All elements can be placed in a periodic table
showing their reaction capabilities.
c) Each element is composed of small, indivisible
particles called atoms.
d) Chemical combination is the bonding of a definite
number of atoms into a molecule.
[Ques. 8] Different samples of a pure compound always
contain the same elements in
a) exactly equal amounts.
b) the same proportion by volume.
c) the same proportion by mass.
d) varying proportions depending on the temperature.
[Ques. 9] A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30 from its initial direction of motion. What is the x component of the velocity of the 1.0-kg object just after the collision?
a. 3.7 m/s
b. 3.4 m/s
c. 1.5 m/s
d. 2.4 m/s
e. 4.1 m/s
[Ques. 10] The average mass assigned to one atom of a
naturally occurring element is referred to as
a)the atomic mass.
b)the reaction mass.
c)the formula mass.
d)the chemical mass.
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