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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
What mass of NH3 can be made from 35.0g of N2?
Relation of mols : N2 + 4H2 → 2NH4
This means : 1 mol of molecular nitrogen will give you 2 mols of ammonia.
Atomic weight : N; 14.0067, H; 1.00797
Molecular weight : N2 ; 28.0134 g/mol, NH4; 18.03858 g/mol
From mol relation, the weight relation is: 28.0134 g of N2 give 36.00772 g of NH4
So 35.0 g of N2 will give you: 36.00772 g x 35.0 g / 28.0134 g ~ 45.0 g of NH4
Is a naturally superior being the same as a supernatural being?
No, a naturally superior being is one who some people consider to be superior than others due to natural characteristics, while a supernatural being is a being whose existence or characteristics cannot be explained by science.
Does the length of a conductor not affect its resistance?
The length of a conductor Does affect it's resistance.
The longer it is, the more the resistance.
A single fixed pulley changes the direction of the?
single fixed pulley changes the direction of the applied force, you pull down, the object goes up.
Do magnifying lens work in sunlight?
Absolutely; you can use a magnifying lens to focus sunlight into a very hot point. This can be used to start fires (which, of course, you would only do under carefully controlled conditions - otherwise the fire can get out of control).
A hypothesis is a proposition made as a basis for reasoning, without any assumption of its truth.
It is an unproved theory or conjecture that may be the basis for experimentation.
Is an independent variable defined to be a variable that is to be predicted or estimated?
neither, an independent variable is a variable not being changed in the process of a science experiment. A variable in math cannot be described, only purpose of a variable is to take place of a number that you are trying to figure out in some equations. Others are equations with no solution.
How do you eliminate variables in a statistics experiment?
By trying to hold one or more variables constant.
For example, we know that car brakes will not work properly (car skids) due to a number of factors, type of car, whether the road is straight or curved, road conditions and car speed. We run experiments where the road conditions are exactly the same, and see at which speed the car begins to skid. Of course we should use the same car in all experiments. We should also drive the same section of road.
What is affected by the independent variable in an experiment?
Time, which affects everything (even if it seems to affect it very slowly).
Dried bread doesn't mold unless it is by some thing moist.
Mold can only grow in moist areas (usually also somewhere warm)
Once mold has begun to grow on bread, it can obtain some of the water it needs from the breakdown of starch (metabolic water) and the mold will continue to grow at a slower rate. Moisture loss will stimulate the production of spores.
What describes a reason for making prediction when doing a controlled experiment?
In scientific method the "prediction" is the theory that the scientific test (the experiment) is being conducted to prove (or disprove).
Do baby Ruth candy bars float?
No it cannot float because it is denser than water. We did this experiment in my HS Chem class. This myth is based of the movie Caddyshack. Watch it. No it cannot float because it is denser than water. We did this experiment in my HS Chem class. This myth is based of the movie Caddyshack. Watch it.
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Missing the bulls-eye but hitting the same spot every time
For an archer to be precise but not accurate, they would be hitting very close to the same spot each time, but they would not hit the center of the target.
Meteorites fall into two classes, stony and iron. There is a belt of meteoric material near Mars, from which many of our meteorites come. Perhaps the debris from a broken planet? The iron meteorites, in fact iron-nickel mixtures, are magnetic. the stony meteorites are not. Have a look for Bode's Law in a reference source.
The Dependent Variable is the thing you are observing
ex: what liquid freezes first
The Controlled variables are the things that you keep the same
ex: the temp., the amount, the time,
The Independent variable are the things that you change
ex: the liquid
thanks
Water with salt evaporates slower than water without salt science project?
Evaporation is a surface phenomenon. In case of pure water any of the molecules of water at surface have the chance of escaping into the air but when salt is added into water some of the ions of salt will come on the surface and thus block some of the surface area which was earlier available for water molecules to escape. Hence chance of water molecules escaping into air becomes less so water with salt evaporates slower than water without salt. This effect is known as elevation in boiling point.
What are variables that the scientist changes in an experiment?
Scientists change the independent variable but measure the dependent variable; other variables are kept constant.
What do you call the variable that is manipulated by an experimenter when conducting an experiment?
Independent variable
What is the factor being tested in an experiment called?
The factor that is being tested in an experiment is called a variable. The factor that is measured or observed is called the dependent variable.
