A substance that speeds up a chemical reaction but is not consumed is a(n) ______________.
Fill in the blank(s) with correct word
[Ques. 2] When a net force on a moving object increases, the object will
a. maintain the same velocity.
b. always show an increase in speed.
c. exhibit a change in speed and/or direction.
d. maintain a constant acceleration.
[Ques. 3] A reaction in which a substance reacts with oxygen, bursts into flame, and forms an oxide is called a(n) ______________ reaction.
Fill in the blank(s) with correct word
[Ques. 4] The SI base units making up the newton are
a. kg m/s.
b. g m/s2.
c. kg m/s2.
d. kg2/s.
[Ques. 5] Most ______________ do their jobs by decreasing the activation energy for a reaction.
Fill in the blank(s) with correct word
[Ques. 6] The acceleration produced by an unbalanced force acting on an object is
a. inversely proportional to the mass of the object.
b. directly proportional to the magnitude of the force.
c. in the direction of the force.
d. all of these.
[Ques. 7] One mole of aluminum consists of ______________ aluminum atoms.
Fill in the blank(s) with correct word
[Ques. 8] A constant net force acting on an object that is free to move will produce a constant
a. speed.
b. velocity.
c. displacement.
d. acceleration.
e. distance.
[Ques. 9] When the equation Ca + H3PO4 Ca3(PO4)2 + H2 is balanced, the sum of all the coefficients (both written and understood) is ______________.
Fill in the blank(s) with correct word
[Ques. 10] An automobile travels due north with a speed of 77 km/h that is decreasing. All forces considered, the unbalanced force acting on the auto is
a. zero.
b. southward.
c. northward.
d. downward.
e. upward.
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