Independent Variables In Unknown Bacteria
Experimental Procedures
Independent Variable
The independent variable is the factor that is being altered to produce a result.
There are two independent variables in this experiment which are the brand of dishwashing detergent; Palmolive, Morning Fresh and Ultra Coles Brand and the type of bacteria used which are; Micrococcus Luteus and an unknown bacteria from a sponge.
Dependent Variable
The dependent variable is the factor that is being tested which is the size of the zone of inhibition from the detergent solution and the bacteria. It will be measured in millimetres using a ruler.
Constant Variables
Constant Variables are set in place in order to produce a fair and even result across all tests conducted within the experiment.
Amount of solution of dishwashing detergent used on each test is the same. …show more content…
Otherwise, one detergent will be stronger or weaker than the others meaning it will affect the rate of elimination of bacteria.
The temperature of the solution of water and detergent.
In order for all three solutions to be at the same temperature and to make sure it is not too hot to kill the bacteria and not too cold to prevent the solution from combining.
Amount of bacteria used on each agar dish.
This is to make sure that no brand of detergent is either more advantaged or disadvantaged than the other in its ability to kill the bacteria.
Amount of time each agar dish spent in incubation and the temperature of the incubator.
To ensure the bacteria has an equal chance of growing within the same timeframe.
Materials
4 beakers
3 small measuring cylinders
10 ml of Palmolive
10 ml of Ultra
10 ml of Morning
Independent Variable
The independent variable is the factor that is being altered to produce a result.
There are two independent variables in this experiment which are the brand of dishwashing detergent; Palmolive, Morning Fresh and Ultra Coles Brand and the type of bacteria used which are; Micrococcus Luteus and an unknown bacteria from a sponge.
Dependent Variable
The dependent variable is the factor that is being tested which is the size of the zone of inhibition from the detergent solution and the bacteria. It will be measured in millimetres using a ruler.
Constant Variables
Constant Variables are set in place in order to produce a fair and even result across all tests conducted within the experiment.
Amount of solution of dishwashing detergent used on each test is the same. …show more content…
Otherwise, one detergent will be stronger or weaker than the others meaning it will affect the rate of elimination of bacteria.
The temperature of the solution of water and detergent.
In order for all three solutions to be at the same temperature and to make sure it is not too hot to kill the bacteria and not too cold to prevent the solution from combining.
Amount of bacteria used on each agar dish.
This is to make sure that no brand of detergent is either more advantaged or disadvantaged than the other in its ability to kill the bacteria.
Amount of time each agar dish spent in incubation and the temperature of the incubator.
To ensure the bacteria has an equal chance of growing within the same timeframe.
Materials
4 beakers
3 small measuring cylinders
10 ml of Palmolive
10 ml of Ultra
10 ml of Morning