textbook

Question 1

We are only taking samples every 30 seconds explain why this is a problem and how we could address this

Answer 1

It is only possible to stay when the start was all broken down to the nearest 30 seconds. This makes our experiment in accurate way to address this is to take samples more frequently for example every 10 seconds.

Question 2

it can be difficult to tell when the reaction has finished. Explain why this is difficult and how we can adress this problem.

Answer 2

-it can be difficult to see when the reaction is finished as the blue black colour of the iodine solution tends to show a gradual change.
-There is no clear cut-off point where the iodine solution stays orange showing at the start is all broken down.

-We can address this problem by asking several people to look at this spotting time and sign when the action has completed.
-We can take a mean of that answers 

Question 3

Explain why the heart is a double circulatory system

Answer 3

This is a double surgery system as a blood passes through the heart twice per cycle.

First deoxygenated blood passes from the heart to the lungs, where it Kalex oxygen the oxygenated blood, nine passes from the lungs back to her. The Hannah pumps the auction are you going to the organs were the blood loses its oxygen. Find the deoxygenated blood passes back to hurt from the organs to be in the cycle.

Question 4

What is an advantage of the double circulatory system

Answer 4

Blood passes through the heart twice per cycle 

Question 5

What does the pulmonary artery, vena cava, Arata, pulmonary vein do

Answer 5

Pulmonary artery-carries deoxygenated blood to the lungs

Venna cava -receives deoxygenated blood from the body

Arata -carries oxygenated blood to the body

Pulmonary vein -receives oxygenated blood from the lungs