Double Bio

Question 1

What is the method of the practical investigating the effect of glucose concentration when testing for diabetes

Answer 1

1. Measure 100cm cubed of water into the beaker
2. Add 2cm cubed of 10% glucose solution into a test tube
3. Add 3 drops of Benedict’s solution into the test tube
4. Place test tube in the beaker of hot water
5. Heat the solution
6. Using a stopwatch time how long it takes the solution to turn from blue to brick red
7. Record in a table
8. Repeat method for 20,30,40, and 50% glucose concentration

Question 2

Tell me the two hazards for this practical and risks and control measure

Answer 2

1. Hazard: Bunsen burner. Risk:can burn you or burn your hair. Control measure: tie your hair up, wear gear protective gloves
2. Hazard: Benedict’s solution is an irritant. Risk: could spill on skin when putting in test tube. Control measure: wear protective gloves

Question 3

What is the hypothesis for the bio practical

Answer 3

As glucose concentration increases the time taken to change colour also increases

Question 4

What’s an independent variable

Answer 4

Thing you change

Question 5

What’s a dependent variable

Answer 5

Thing you measure

Question 6

What is control variables

Answer 6

Things you keep the same

Question 7

What is the independent variable for the bio practical

Answer 7

Glucose concentration (10,20,30,40,50%)

Question 8

What is the dependant variable for the bio practical

Answer 8

Time it takes to turn from blue to brick red (seconds)

Question 9

What is the control variable in bio practical

Answer 9

2cm cubed of glucose solution 3 drops of Benedict’s

Question 10

How do you control the control variables for the bio practical

Answer 10

Use a pipette
Use a measuring cylinder

Question 11

State the resolution of the stopwatch in the bio practical

Answer 11

0.01

Question 12

State the range of the independent variable

Answer 12

Range=biggest take away the smallest
50-10=40%

Question 13

Explain how you could determine the reproducibility of your results

Answer 13

Same method, different person/group same results

Question 14

Identify the e biggest source of uncertainty in your bio investigation

Answer 14

Seeing the colour change. The end point

Question 15

Suggest how you can improve the experiment to reduce the uncertainty in the bio practical

Answer 15

Use a colorimeter

Question 16

Explain why a person with diabetes will have glucose detected in their urine in the bio practical

Answer 16

No insulin
Glucose isn’t converted
Excess glucose in urine

Question 17

Another person who hasn’t got diabetes has there urine tested. Explain the results you would see from a Benedict’s test

Answer 17

No glucose in urine
Benedict’s will stay blue