rate of reactions

Question 1

what is an anomalous result

Answer 1

a measurement or reading that does not fit in with the pattern of the other results; such a result is not necessarily wrong, but it should be checked

Question 2

collision

Answer 2

what happens when two or more objects bump into each other

Question 3

gradient

Answer 3

the steepness of a slope, including on a graph, indicates how fast a reaction has taken place

Question 4

rate of reaction

Answer 4

how quickly or slowly a reaction happens

Question 5

rate of reaction equation

Answer 5

rate of reaction = amount of product formed or reactant used up/time

Question 6

what is the units for rate of reaction

Answer 6

volume - cm3/s
mass - g/s

Question 7

what is the equation for gradient

Answer 7

rise/run

Question 8

what is a tangent line

Answer 8

line that touches the curve

Question 9

what things effect the rate of reaction?
(4)

Answer 9

• surface area
• temperature
• concentration
• pressure

Question 10

how can you measure the rate of reaction

Answer 10

by working out how much of one of the products has been made in a given time, or how much of a reactant has been used up in a given time

Question 11

concentration

Answer 11

a measure of how many particles of a substance are in a fixed volume of a solution

Question 12

dilute

Answer 12

adding water to a solution dilutes it; there are fewer particles of the solute in a fixed volume of the solution

Question 13

surface area

Answer 13

measurement of the space on the surface of an object measured in cm2

Question 14

why do smaller pieces of solids (powdered) react faster then lumps of the same mass

Answer 14

they have a larger surface area

Question 15

precipitate

Answer 15

an insoluble solid formed when two soluble substances react

Question 16

preliminary work

Answer 16

some practical work you do before an investigation to find out how you will carry it out. for example, you might find out the range or interval of the independent variable that you will use

Question 17

what is collision theory and what is another name for it

Answer 17

another name for it is particle theory, Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions.

Question 18

what type of energy does heat give particles

Answer 18

kinetic energy

Question 19

what is activation energy

Answer 19

the relatively small amount of energy needed to start a chemical reaction