starch/ iodine experiment

Question 1

hypothesis for starch/ iodine experiment

Answer 1

If iodine is added to a range of food samples, iodine will change from yellow/brown to blue/black when added to bread as starch is present. Water, oil, milk will stay yellow/brown as no starch is present.

Question 2

independent variable for for starch/ iodine experiment

Answer 2

type of food sample tested

Question 3

dependent variable for starch/ iodine experiment

Answer 3

colour change of iodine( prescence / absence of starch)

Question 4

controlled (fixed) variable for starch/ iodine experiment

Answer 4

volume of food, volume of iodine

Question 5

control (comparison) for starch/ iodine experiment

Answer 5

2ml of water + iodine

Question 6

equipment and materials for starch/ iodine experiment

Answer 6

5 test tubes, dropper, Iodine, water, oil, 7up, milk, bread

Question 7

accuracy and prescision considerations for starch/ iodine experiment

Answer 7

followed repeatable steps, repeated experiment and got similar results

Question 8

step 1 for starch/ iodine experiment

Answer 8

label test tubes

Question 9

step 2 for starch/ iodine experiment

Answer 9

add 2ml of water and 2cm3 to food test tubes

Question 10

step 3 for starch/ iodine experiment

Answer 10

add 2/3 drops iodine- swirl for 5-10 secs. let test tube stand for 5 mins. observe colourchange and record results

Question 11

colour changes of iodine stain for starch/ iodine experiment

Answer 11

everything stays at yellow/ brown except bread which turns blue black

Question 12

data evaluation for starch/ iodine experiment

Answer 12

repeated, used correct equipment, compared test to a control, had control variables