To slow down a chemical reaction you will do one of the following:
Place the reactants in hot water
Place the products in ice bath
Place the reactants in an ice bath
Keep stirring the reactants with a stirring rod
Q.2.
The following equation shows the reaction between calcium carbonate, CaCO3 and hydrochloric acid, HCl:CaCO3(aq) + 2HCl(aq) → CaCl2(aq) + CO2 (g) + H2O(l)Which of the following is the suitable method to measure the rate of reaction?
Change in the temperature of the solution with time
Change in the volume of carbon dioxide gas with time
Change in the mass of water with time
Change in the concentration of hydrochloric acid with time
Q.3.
More collisions correspond to a:
Faster reaction rate
Slower reaction rate
Constant reaction rate
None of the above
Q.4.
Hydrochloric acid can react with sodium thiosulfate solution to form a sulfur precipitate. The equation is:Na2S2O3(aq) + 2HCl(aq) → 2S(s) + SO2(g) + 2NaCl(aq) + H2O(l)In a second experiment, an extralmL of water is added to the hydrochloric acid. As a result of this change, the
rate of evolution of the sulfur dioxide decreases
precipitate will form more quickly
more fruitful collision will occur
reaction will not be affected because water is not a reactant
Q.5.
Why does breaking up a solid reactant increase the rate of reaction?
it creates more solid
it creates more energy
it increases the total surface area
it increases the concentration
Q.6.
Increasing pressure causes the reacting particles
to bond together
to repel from each other
gain more kinetic energy
to move closer together
Q.7.
Catalyst helps to
increase the amount of product obtained
to lower the activation energy
provide an alternative reaction route
decrease the frequency of collision
Q.8.
Which manufacturing of the following is not a characteristic of catalyst?
A catalyst is specific in its reaction.
A catalyst influences the quantity of product of a reaction.
The chemical property of a catalyst remains unchanged at the end of the reaction.
Only a little amount of a catalyst is needed to influence the rate of reaction.
Q.9.
Magnesium reacts with acid to produce hydrogen gas, H2.Which solution would give the highest initial rate of reaction?
100 cm3 of 1.0 mol dm-3 of nitric acid, HNO3
100 cm3 of 1.0 mol dm-3 of hydrochloric acid, HCl
100 cm3 of 1.0 mol dm-3 of sulphuric acid, H2SO4
100 cm3 of 1.0 mol dm-3 of ethanoic acid, CH3COOH
Q.10.
Which of the following reactions occurs at the highest rate?
Photosynthesis
Rusting of iron
Combustion of hydrogen in oxygen
Combustion of magnesium in oxygen
Q.11.
The following equation represents the reaction between calcium carbonate, CaCO3 and hydrochloric acid, HCl.CaCO3 + 2HCl --> CaCl2 + CO2 + H2OWhich changes can be used to determine the rate of reaction?I : mass of calcium carbonate per unit timeII : Volume of carbon dioxide released per unit timeIII : Colour of solution per unit timeIV : Mass of precipitate produced per unit time
I and II
I and III
II and IV
III and IV
Q.12.
The reaction between zinc, Zn and hydrochloric acid, HCl is represented by the following equation.Zn + 2HCl --> ZnCl2 + Hstudent wants to determine the rate of reaction in a school laboratory. Which of the following methods is the most suitable?
Determine the change in temperature of the solution with time
Determine the change in the concentration of zinc chloride with time
Determine the volume of hydrogen gas given off with time
Determine the change in the concentration of hydrochloric acid with time
Q.13.
In which of the chemical reactions can the rate be determined by measuring the change in the gas volume?
Acidified potassium manganate (VII) solution with iron (II) sulphate solution
Sodium hydroxide solution with dilute hydrochloric acid
Silver nitrate solution with sodium chloride solution
Calcium carbonate with dilute hydrochloric acid
Q.14.
The rate of reaction for the decomposition of hydrogen peroxide decreases with time because
product of reaction decreases
temperature of hydrogen peroxide decreases
volume of hydrogen peroxide decreases
concentration of hydrogen peroxide decreases
Q.15.
Which reactions has the highest rate of reaction?
Rusting of water pipe
Photosynthesis in green plant
Burning of a small piece of charcoal in the air
Formation of stalactites and stalagmites
Q.16.
Which of the following has the lowest rate of reaction?
Combustion of ethanol
Fermentation of glucose
Oxidation of magnesium
Precipitation of silver chloride
Q.17.
Which unit is correct for the rate of reaction?
g mol-1
g min-1
mol dm-3
kJ mol-1
Q.18.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
larger
smaller
rectangular
spherical
Q.19.
Increasing the ____ causes the particles (atomsor molecules) of the reactants to move more quickly so thatthey collide with each other more frequently and with moreenergy.
Catalyst
Surface Area
Temperature
Concentration
Q.20.
Pick the TWO (options that will INCREASE the rate of a reaction.
Adding Heat
Adding Catalyst
Removing Catalyst
Both A & B
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