Science Experiments

Posts Tagged ‘control group’

Question: What is a good title for my science experiment?

It is about whether deforestation affects the buildup of greenhouse gases in the atmosphere and has to do with plants. Also: what is a variable or control group in an experiment (please answer this as simple as you can because i looked on other websites but the way they explained it was too complicated to understand.

Answer: a basic title may be ~Is Deforistation a cause of global warming ?
a control group is a sample or object that is left in it’s natural state
for example
an experiment to find out what hapens when you put white roses in a vase containg an amount of ink in the water
use 4 roses
1st in water with one drop of blue ink~slight bluish tint after 3 days
2nd in water with three drops of blue ink~deeper blue than the 1st
3rd in water with three drops of red ink~rose is a red shade
4th just in water~rose is white
from the above you can then conclude
the amount of ink in the water affects the colour .more ink is a darker shade
the colour of the ink affects the colour~blue +blue
red=red.
the control rose in plain water shows no colour change
conclusion putting coloured ink in the water changes the colour of the white rose
as you can see if you do not use a control you could not say it is the ink that causes the colour change

http://news.bbc.co.uk/cbbcnews/hi/find_out/guides/world/global_warming/newsid_1575000/1575441.stm

hope this helps

Mind Control Experiment

Still wondering exactly what using the Scientific Method is like? Below are some quick examples of Scientific Method at work….

Scientific Method example 1

Question: Does nitrogen help to make corn grow better?

Hypothesis: Sweet corn planted in sandy loam in planters in the laboratory and treated with 2 grams of urea per liter of water will show a significant increase in height at two weeks after germination as compared with a control planting.

Scientific Method example 2

Question: Can mice grow normally if they are fed only dried peas?

Hypothesis: White mice born in a cage and fed only whole dried peas will make normal growth to age 60 days as compared with a control group fed Brand K mouse food.

Your hypothesis should be stated definitely so that it can honestly be tested.