Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
2.
What is the rate of reaction?
a)
How much energy is needed for a reaction to occur.
b)
The energy required to break a bond.
c)
The time it takes for a reaction to occur.
d)
Collision Theory
3.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
4.
Increasing the concentration of the reactants will slow down the reaction.
a)
false
b)
true
5.
Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?
a)
tightly coil up the strip of magnesium
b)
cut up the strip of magnesium
c)
increase the concentration of the hydrocholoric acid
d)
increase the temperature of the hydrocholoric acid
6.
Products will form faster if____________
a)
the particle size of the reactants are larger.
b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
7.
_______ refers to how much solute is dissolved in
a solution.
a)
Surface Area
b)
Catalyst
c)
Temperature
d)
Concentration
8.
________ is the measure of how much area of an
object is exposed.
a)
Surface Area
b)
Catalyst
c)
Concentration
9.
Increasing the ____ causes the particles (atoms
or molecules) of the reactants to move more quickly so that
they collide with each other more frequently and with more
energy.
a)
Catalyst
b)
Surface Area
c)
Temperature
d)
Concentration
10.
The diagram shows a kerosene lantern.
A kerosene lantern is a lighting device. It uses a petroleum product called kerosene as fuel. The kerosene is held in the base of the lantern, and a cloth wick soaks up the kerosene. Air can flow into the lantern through holes in the device. When the wick is lit, the kerosene in the wick undergoes a chemical reaction with oxygen in the air to release energy in the form of light.
Which change to the device would increase the amount of time the lantern provides light? (Choose two correct)
a)
Increase the size of the base to hold more kerosene
b)
Change the shape of the flame to give off more light.
c)
Decrease the size of the air holes to allow less air flow.
d)
Change the material of the wick to soak up more kerosene.
e)
Add an extra wick so two flames can burn at the same time.
11.
Billows are often used to pump more air into a fire. Which statements would be true about the results (two correct)?
a)
The fire would burn hotter and brighter
b)
There would be no change in the brightness.
c)
The wood fuel source would be used up sooner.
d)
Less smoke would be produced
e)
The total energy released would be greater than without billows
แป้นคำตอบ
Rates of chemical reactions
คำถามทั้งหมด: 11
1.
b)
surface area
2.
c)
The time it takes for a reaction to occur.
3.
a) larger
4.
a) false
5.
a) tightly coil up the strip of magnesium
6.
c) concentration of the reactants are increased.
7.
d)
Concentration
8.
a)
Surface Area
9.
c)
Temperature
10.
a)
Increase the size of the base to hold more kerosene
, c)
Decrease the size of the air holes to allow less air flow.