Reaction Rate
This term describes the speed at which a chemical reaction occurs.
What is reaction rate?
Reactant particles must do this before they can react
What is collide?
Increasing this gives reacting particles more kinetic energy.
What is temperature?
Breaking a solid into smaller pieces increases this property.
What is surface area?
This is the variable deliberately changed by the investigator.
What is the independent variable?
Reaction rate can be determined by measuring the change in the amount of a reactant or product over this.
What is time?
This is the minimum amount of energy particles require for a reaction to occur.
What is activation energy?
A solution with a higher concentration contains more reactant particles in the same amount of this.
What is space or volume?
Of a whole, halved and crushed fizzy tablet, this form should react fastest.
What is the crushed tablet?
This is the variable measured or observed during the investigation.
What is the dependent variable?
This gas can be measured when magnesium reacts with hydrochloric acid.
What is hydrogen gas?
Particles do this when they collide with less energy than the activation energy.
What is bounce apart without reacting?
Increasing the concentration of a reactant usually has this effect on reaction time
What is decreasing or shortening the reaction time?
This substance changes the rate of a reaction without being used up.
What is a catalyst?
Repeating each experimental level several times helps improve this quality of the results.
What is reliability?
On a reaction graph, this type of gradient generally indicates a faster reaction.
What is a steeper gradient?
Reaction rate depends on the frequency of collisions and this other feature of the collisions.
What is their energy?
In the 2nd investigation, this was deliberately changed between 0.2 M, 0.6 M and 1.0 M.
What is the concentration of hydrochloric acid?
A catalyst speeds up a reaction by lowering this energy barrier.
What is activation energy?
Improving the accuracy or reliability of a method while keeping the same independent and dependent variables is this type of modification.
What is refine?
This is an appropriate unit for measuring the volume of gas produced during a reaction.
What is cubic centimetres per minute, or cm³/min?
In addition to sufficient energy, particles must collide in this way for the collision to be successful.
What is with a suitable orientation?
Compared with 0.2 M hydrochloric acid, 1.0 M hydrochloric acid should produce this result, because particles collide more frequently.
What is a faster reaction or shorter reaction time?
These special proteins act as biological catalysts in living cells.
What are enzymes?
Adding more levels or a wider range is called the first term; changing the independent or dependent variable to investigate a related question is called the second term.
What are extend and redirect?