Science Experiments

The source used in the Rutherford experiments was purifed radium contained in a thin-walled 1-mm diameter glass tube. The source strength was about 0.1 Curie, or about 4 billion nuclear decays per second. The alpha particles were allowed to pass through a small diaphragm and were directed toward a thin foil target. The detector was a small (10-6 m2) zinc sulfide screen mounted a few centimeters away from the target. (Rohlf) answer above posted by strawberry

Stem cells are basic cells. They are completely undefined and can become anything. Stem cells can be used the grow various organs due to this. The cells however would only be useful to the person that donated them. I hope this helps better than the previous nonsense answer

When conducting an experiment to show others as a demonstration, you will need to list each step you take in the process. This will show the audience the materials they need, the time involved and how each step is done.

check the pH, there are many methods for this. simple pH paper or probes.

Or you could titrate

Dew forms during condensation.

I really do not know what the answer for this question is.

simply cover a burning candle with a glass to cut off the air, then the candle will burn out

Two. The equation means two water molecules, H20. Thus you have 4 hydrogens and 2 oxygens.

a change of state

To make sure they did it right and that their results can be replicated.
Scientist do experiments more than once to make sure they are accurate in measuring or finding out, so basically to make sure it is correct in case they have different answers. Normally they check at least 3 times.

The Enhanced Fujita scale is used to measure the intensity of a tornado. Damage from the tornado is analyzed to obtain wind speed estimates. The highest estimate is then used to assign a rating to one of the six categories listed below with typical damage.

EF0: 65-85 mph. Some shingles and siding peeled lose. Tree limbs broken with some weaker trees toppled.

EF1: 86-110 mph. Houses suffer severe roof damage and broken windows. Mobile homes are overturned or partially destroyed. Garages and porches may collapse.

EF2: 111-135 mph. Roofs torn from well-built houses. Mobile homes completely destroyed. Large trees snapped.

EF3: 136-165 mph. Roofs and walls removed from well-built houses. Most trees uprooted or snapped. Some debarking may occur.

EF4: 166-200 mph. Well-built houses completely leveled. Trees debarked. Uprooted trees go airborne.

EF5: over 200 mph. Well-built homes wiped clean of foundations. Concrete structures severely damage. Asphalt peeled from roads.

Try to see if a paper airplane will fly farther with 5 paperclips on the nose as opposed to 0,1,or 3.

Question: Will the # of paperclips on the nose of a paper airplane cause the plane to fly farther?

Hypothesis: 5 paperclips on the nose of a paper airplane will make he plane fly farther than with 3,1,or 0 paperclips on the nose.

Experiment: Make paper airplanes and fly them with 0 paperclips on the nose. Repeat this test 3 times. Record about how many meters each test flew. Repeat this with 1 paper clip, than 3 paperclips, and finally 5 paperclips.

Analyse: Record the average of the 3 tests. write down the steps you took in completing the experiment. Also write down the controlled, dependent, and independent variables of the experiment.

Conclusion: 5 paperclips on the nose of the paper airplane will make the plane fly farther than with 0,1,or 3 paperclips on the nose.

Compare: Compare the averages, variables, and steps taken along with any other data, to that of other scientists. Remember, a valid experiment can be repeated with duplicated results.

The three kinds of graph is bar graph, line graph, and pie graph. bar graph is used to compare two or more things. A line graph is used to show changes over time. A pie graph is used to show proportions.

A ring shaped coral island found for from land is called an atoll.

Chromatography is a method used by scientists for separating organic and inorganic compounds so that they can be analyzed and studied. By analyzing a compound, a scientist can figure out what makes up that compound. Chromatography is used in many different ways. Some people use chromatography to find out what is in a solid or a liquid. It is also used to determine what unknown substances are. The Police, F.B.I., and other detectives use chromatography when trying to solve a crime. It is also used to determine the presence of cocaine in urine, alcohol in blood, PCB's in fish, and lead in water. Chromatography is used by many different people in many different ways.

When a liquid is under pressure, this increases it's solubility, or the amount of a gaseous solute that can dissolve in it. When you open the can and the pressure decreases, there is more carbon dioxide gas in the pop than it can hold, so some of it must turn back to a gas.

Urine is Water, Urea, Creatinine,Uric Acid, Salt, Ammonia and other trace elements and hormones.

you could use the question: how does earth worms affect plant growth, or how a volcano affects the earth after it erupts that's only if you are that kind of person who likes explosive things
Hermit Crabs

If you change more than one variable at a time, you will not be able to tell which variable is responsible for what change. Scientists need to know exactly which variable caused the observed experimental results.
It is advantageous for scientists to test only one variable at a time during an experiment because if you change all variables at once, you will not be able to tell which variable is responsible for the observed results.

when EM waves encounter a material medium, they can interact with it in much the same way that mechanical waves do. A mechanical wave transfer energy in two ways. As it travels, the wave moves potential energy from one place to another.

a dog

The more massive an object is, the greater its inertia.

1. Water enters the seed through a hole in the seed coat called the micropyle.
2. Water moves into the tissues and cells by imbibition and osmosis .
3. The seed swells and the seed coat bursts.
4. Water activates gibberelline, the hormone needed for breaking the dormancy of the seed.
5. Gibberelline activates amylase which hydrolyses starch to maltose, and maltose is then hydrolyzed by maltase into glucose.
6. Glucose is mobilized (transported) to the embryo .
7. The embryo absorbs glucose and uses it for respiration (oxygen is needed in this process).
8. Cell division, growth and elongation occur in the embryo . The radicle starts growing downwards into a root and the plumule starts growing upwards into a shoot.
9. The nutrients needed for growth are all supplied by the food stored in the cotyledons.
10. As the nutrients in the cotyledons are consumed and exhausted, the first leaves start to appear and the plant starts to photosynthesize and make its own food.
11. When photosynthesis starts, the seedling absorbs water and minerals from the soil, carbon dioxide from the atmosphere and sunlight.

Hot air is less dense (lighter) than colder air, so warmer air will naturally rise above the cooler air.