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- Multiple ChoicePlease save your changes before editing any questions.Which factors increase the rate of a reaction.increasing temperatureincreasing concentrationincreasing surface areaall of these
- Multiple ChoicePlease save your changes before editing any questions.Increase in temperature of the reactants can do one of the followingSlow collision frequencyAllow less effective collision between the particlesNeutralise the reactionincrease collision between the particles thus increasing the rate.
- Multiple ChoicePlease save your changes before editing any questions.Why does a catalyst increase the rate of reaction?it produces extra energy for the reactantsit increases the speed of the reactant particlesit increases the frequency of particle collisionsit reduces the activation energy of the reaction
- Multiple ChoicePlease save your changes before editing any questions.Which of the following increase the reaction rate?less surface arealower temperaturean inhibitorincreased concentration
- Multiple ChoicePlease save your changes before editing any questions.Why don't all collisions between particles cause a reaction?the particles also need to collide with a catalystnot all the particles collide with enough energynot all the particles collide at a high enough temperaturethe particles need to collide with each other twice
- Multiple ChoicePlease save your changes before editing any questions.Why does a higher temperature increase the rate of a reaction?it increases both the frequency and energy of particle collisionsit only increases the frequency of particle collisionsit only increases the energy of particle collisionsit reduces the activation energy of the reaction
- Multiple ChoicePlease save your changes before editing any questions.To slow down a chemical reaction you will do one of the following:Place the reactants in hot waterPlace the products in ice bathPlace the reactants in a ice bathKeep stirring the reactants with a stirring rod
- Multiple ChoicePlease save your changes before editing any questions.
How could we make this reaction happen more quickly?
Decrease the concentration of the acid
crush the chalk to increase the surface area
Put the test tube in an ice bath
- Multiple ChoicePlease save your changes before editing any questions.
What does the M after a concentration value stand for?
meters
music
Molarity
moles
- Multiple ChoicePlease save your changes before editing any questions.
Which is the highest concentration?
10m
2M
25 mmol
0.5M
- Multiple ChoicePlease save your changes before editing any questions.
The major theory of reaction rate is called
Collision theory
Crash theory
Newton's laws
Thermodynamics
- Multiple ChoicePlease save your changes before editing any questions.
When surface area is decreased the rate of reaction...
Decreases, because there are LESS possible sites for correct collisions
Increases, because there are LESS possible sites for correct collisions
Decreases, because there are MORE possible sites for correct collisions
Increases, because there are MORE possible sites for correct collisions
- Multiple ChoicePlease save your changes before editing any questions.
How does a catalyst work in speeding up a reaction?
By lowering the activation energy or reaction
by giving them more energy
by making them more available
- Multiple ChoicePlease save your changes before editing any questions.
Why does a higher concentration increase the rate of reaction?
it increases the amount of reactants
it lowers the activation energy
it increases the energy of particle collisions
it increases the frequency of particle collisions
- Multiple ChoicePlease save your changes before editing any questions.
The ______________is required to break the bonds of the reactants.
Carbonic energy
Activation energy
Plutonic energy
Fuel energy
- Multiple ChoicePlease save your changes before editing any questions.
What factors can affect the value of the activation energy of a reaction?
The presence of a catalyst
changes in temperature
changes in concentration of the reactants
changes in pressure
- Multiple ChoicePlease save your changes before editing any questions.Catalysts are thought to increase the rate of a chemical reaction bysupplying the energy needed to overcome the activation energyincreasing the temperature of the reactionproviding less surface area for the reactionproviding an alternative reaction pathway with a lower activation energy
- Multiple ChoicePlease save your changes before editing any questions.What is the rate of reaction?How fast a reaction isHow big a reaction isHow loud a reaction isHow much gas a reaction produces
- Multiple ChoicePlease save your changes before editing any questions.
Grinding a effervescent tablet into powder increases the rate of reaction due to increased
concentration
surface area
temperature
reactants
- Multiple ChoicePlease save your changes before editing any questions.
A liquid X reacts with solid Y to form a gas.
Which two diagrams show suitable methods for investigating the rate (speed) of the reaction?
1 and 3
1 and 4
2 and 3
2 and 4
- Multiple ChoicePlease save your changes before editing any questions.
An experiment, S, is carried out to measure the volume of hydrogen produced when excess dilute sulfuric acid is added to zinc.
A second experiment, T, is carried out using the same mass of zinc but under different conditions.
The results of the two experiments are shown.
Which changes in the conditions between experiments S and T give curve T?
Addition of a catalyst: Yes;
The zinc is in large pieces, not powdered: Yes.
Addition of a catalyst: Yes;
The zinc is in large pieces, not powdered: No.
Addition of a catalyst: No;
The zinc is in large pieces, not powdered: Yes.
Addition of a catalyst: No;
The zinc is in large pieces, not powdered: No.
- Multiple ChoicePlease save your changes before editing any questions.
Magnesium is reacted with a dilute acid. The hydrogen gas is collected and its volume measured. The results are shown on the graph.
Between which times was the reaction fastest?
0 and 1 minute
1 and 2 minutes
2 and 3 minutes
7 and 8 minutes
- Multiple ChoicePlease save your changes before editing any questions.
The effect of temperature on the rate of the reaction between marble chips and hydrochloric acid can be investigated by measuring the production of carbon dioxide.
Which item of equipment is not required for the investigation?
condenser
gas syringe
stopclock
thermometer
- Multiple ChoicePlease save your changes before editing any questions.
The diagram shows four experiments in which equal volumes of aqueous acid (all in an excess)
are added to equal masses of metal. Both acids have the same concentration.
In which experiment has the metal completely reacted in the shortest time?
A
B
C
D
- Multiple ChoicePlease save your changes before editing any questions.
The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction changes with temperature.
Which statement must be correct?
The reaction is endothermic.
The reaction is exothermic.
The reaction produces a gas.
The reaction produces an acid.
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following changes, DECREASES the rate of the reaction between magnesium and dilute hydrochloric acid?
1 - diluting the acid
2 - using larger pieces of magnesium
3 - cooling the mixture
1 and 2 only.
1 and 3 only
2 and 3 only
1, 2 and 3
- Multiple ChoicePlease save your changes before editing any questions.
Powdered marble reacts with hydrochloric acid using the apparatus shown. The gas syringe fills in 36 seconds.
The experiment is repeated using marble chips in place of powdered marble.
How long does it take to fill the gas syringe in this experiment?
9 seconds
18 seconds
36 seconds
72 seconds
- Multiple ChoicePlease save your changes before editing any questions.
A student investigates the rate of reaction between marble chips and hydrochloric acid.
The mass of the reaction flask is measured.
The graph shows the results of two experiments, P and Q.
Which change explains the difference between P and Q?
A catalyst is added in P.
A higher temperature is used in P.
Bigger marble chips are used in Q.
Hydrochloric acid is more concentrated in Q.
- Multiple ChoicePlease save your changes before editing any questions.
The rate of a reaction depends on temperature, concentration, particle size and catalysts.
Which statement is not correct?
Catalysts can be used to increase the rate of reaction.
Higher concentration decreases the rate of reaction.
Higher temperature increases the rate of reaction.
Larger particle size decreases the rate of reaction.
- Multiple ChoicePlease save your changes before editing any questions.
Which changes decrease the rate of reaction between magnesium and air?
1 heating the magnesium to a higher temperature
2 using a higher proportion of oxygen in the air
3 using magnesium ribbon instead of powdered magnesium
1, 2 and 3
1 only
2 only
3 only
- Multiple ChoicePlease save your changes before editing any questions.
Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?
- Multiple ChoicePlease save your changes before editing any questions.
In separate experiments, a catalyst is added to a reaction mixture and the temperature of the mixture is decreased.
What are the effects of these changes on the rate of the reaction?
A
B
C
D
- Multiple ChoicePlease save your changes before editing any questions.
________ is the measure of how much area of an
object is exposed.
Surface Area
Catalyst
Concentration
- Multiple ChoicePlease save your changes before editing any questions.
A ______ is a substance that speeds up the rate of a
chemical reaction without being used up in the reaction itself.
Concentration
Catalyst
surface area
- Multiple ChoicePlease save your changes before editing any questions.
Adding ______ will increase the rate of reaction because
this causes the particles of the reactants move more quickly, resulting in more collisions and more _________.
Heat / Energy
Higher Concentrations / Explosions
Catalysts / Casualties
Reactants / Products
- Multiple ChoicePlease save your changes before editing any questions.
Grains of sugar (powder sugar) have a greater _______ than a solid cube of
sugar, so will dissolve quicker in water.
Surface Area
Catalyst
Temperature
- Multiple ChoicePlease save your changes before editing any questions.
What is the activation energy?
The quantity of heat absorbed in a reaction
The minimum energy needed to begin a reaction
The energy difference between reactants and products
- Multiple ChoicePlease save your changes before editing any questions.
How do catalysts increase the rate of reaction?
The frequency of collisions is the increased
The activation energy is lowered
Both the frequency and energy of collisions is increased
- Multiple ChoicePlease save your changes before editing any questions.What is the activation energy?40 kJ20 kJ100 kJ60 kJ
- Multiple ChoicePlease save your changes before editing any questions.Is the reaction endothermic or exothermic?EndothermicExothermicCaroussothermicNonthermic