0
Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
How many molecules are in 3.5grams of H2O?
There are 23 atoms in 6.0 g of water. Using this formula (6 g H2O)(1 mol H2O / 18 g H2O) = 1/3 mol H2O (1/3 mol H2O)(2 mol H / 1 mol H2O)(6.022 x 10^23 atoms H / 1 mol H) = 4.0 x 10 therefore 23 atoms.
How do you heat liquid in a beaker?
In a laboratory there are several methods to heat liquids in beals or other glassware depending on the temperatures you wish to attain and the control you wish to have over the temperature,
- For rapid heating a stand supporting the beaker over a Bunsen burner or Maker burner
- for controlled temperature a water or glycol bath
- immersion heaters
- microwave heaters
- electric coils under the beaker
In 5th grade science what is a dependent variable?
The dependent variable is what changes. For example, if you are growing a plant, the growth of the plant depends on the amount of light it is given. The growth of the plant is the dependent variable.
How do you answer hookes law experiment?
Hooke's law of elasticity is an approximation that states that the extension of a spring is in direct proportion with the load applied to it.
What reason is the primary rationale for controlling variables in an experiment?
To eliminate alternative explanations for the result of an experiment
How does the stuff get in the blotter paper?
Blotter paper is soaked in a liquid solution of a compound, then allowed to dry out.
What does a 8 grade science fair project outline look like?
Introduction, Background, Info, Experiment Design, Data
Why are you researching, Hypothesis, and importance of project
What primary principle of experimental design did their experiment fail?
On March 23, 1989, the chemists Stanley Pons of the University of Utah and Martin Fleischmann of the University of Southampton announced to the world that they had achieved cold fusion. That is, with a solution of salts in a simple desktop apparatus, they had caused hydrogen atoms to 'fuse' or combine into helium atoms. This reaction had previously been achieved only in hydrogen-bomb blasts and in giant research projects lasting many decades and costing many billions of dollars.
The two chemists claimed that they had been able to measure the energy released by the fusion process in their simple setup. The scientific world was in an uproar, because if this were really true, cold fusion would be the greatest discovery in a thousand years -- a practically infinite source of cheap, safe energy.
However, no matter how hard they tried, no other scientists were able to get the same results. Pons and Fleischmann had dozens of excuses, but none of them were shown to have merit. Ultimately, both scientists resigned in disgrace.
REPLICATION
Any excess materials that are not used during a laboratory experiment may be poured down the drain?
No. Chemicals should be disposed of in a safe manner. Usually directions for disposal can be found on the box/tube/packet that the chemical came in. If none can be found, ask a professional (teacher, lab assistant, poison control expert) what is the proper disposal for a certain chemical. Excess materials poured down the drain may be poisonous to the environment or people, and can leak from the sewage system to our ground water and eventually to our food.
Which fluid force opposes lift?
Answer The essence of your question is very complicated and concerns fluid mechanics but I will simplify it as much as possible. In short, the force that opposes lift is weight (the gravitational force acting on an object's mass). If lift is greater than weight leaving all other variables such as air resistance are left the same the object is ascend. If weight is greater than lift the object will descend if already in the air or never take off if still on the ground. This question is at the heart of why planes fly. The leading edge of the wing causes the air on top to travel than the air on the bottom. Bernoulli's principle says as the speed of a fluid increases the pressure of the fluid decreases. As a result, the air on top of the wing has a lower pressure than the air on the bottom. Fluid go from high to low pressure. The air on the bottom of the wing exerts a force upward and thus the plane rises. It is important to know the other two force crucial in the flying of plane. They are thrust and drag. Thrust is the reactionary force to the force that push air out of a jet engine or from propellers. Drag is the force of air resistance and it is proportional to the velocity of the object. In other words, as the object goes faster the force trying to slow it down increases as well. This continues until the object reaches terminal velocity. Terminal velocity is the point at which the force acting on an object and the frictional force become equal in magnitude and opposite in direction. As a result, the net force acting on the object is zero and the object stops accelerating and falls at a constant rate from that point on.
What is the abstract for egg in bottle experiment?
First, the science behind a hard-boiled egg: Egg whites are made of water and proteins. Proteins are made of long chains of amino acids, but in an egg the chains are clumped tightly together in individual spheres. (These are called "globular proteins.") When the egg is heated, the proteins and water molecules begin to move faster. As they move and collide with each other, the individual protein chains start to "unravel," eventually bonding loosely with other protein chains, forming a network of protein with water trapped inside. The consistency has changed from runny egg white to a soft solid!
So how does this squishy-but-solid egg get mysteriously pushed inside the bottle? The answer is all about air pressure. When you first set the egg on the bottle, the air pressure inside the bottle matched the air pressure outside, so nothing happened. When you dropped the burning paper into the bottle, it caused the air inside to heat up and expand rapidly. That expanding air pushed the egg aside and escaped from the bottle; that's why you saw the egg vibrating. When the fire consumed all the oxygen inside the bottle, the flame went out and the remaining air in the bottle cooled down. Cool air takes up less space, exerting less pressure inside the bottle. (The egg acted as a seal to prevent outside air from getting in to fill the extra space.) The result was an unbalanced force-the force of the air pushing on the egg from outside the bottle was greater than the force of the air pushing up on it from inside the bottle. Voila - the egg was pushed into the bottle!
How do you get the egg out again? You need to increase the pressure inside the bottle. Turn the bottle upside down and tilt it until the small end of the egg is sitting in the mouth. Now put your mouth close to the bottle and blow, forcing more air into the bottle and raising the pressure inside. When you take your mouth away, the egg should pop out.
What temperature differences occur from beginning to end in an explosion?
Well if you turn around three time and then say i like watermelons that is your answer
What is the different between primary absorbance and secondary absorbance in fluorescence?
in primary light absorbed by outer molecule while in secondary re-absorbance occurs
What is the use of acids and alkalis to stings and bites?
The use is to neutralise the sting or bite.
By Julia
How much energy will be needed to vaporize 175g of water?
The amount of energy needed to vaporize 175 g of water depends on the temperature of the water. However, we shall assume it is 100 degrees C. We multiply 175 by 539 and get 94,325 calories. (Notice the small c). We could express it as 94 Calories if we were talking about the stuff on your dining room table.
Add salt to water and get pure water back?
you should distille the water ( heat the water so it evaporates and let it condensate into a cup or a mirror)
Desribe one property of metal that makes it a good material to connect to the cells and bulbs?
One property of metal that makes it a good material for connecting to cells and bulbs is its high electrical conductivity. Metals such as copper and silver have low resistance to the flow of electricity, making them efficient conductors. This allows for easy and reliable transfer of electrical energy between the power source, cells, and bulbs in a circuit.
What does variables mean in a science project?
That means something that will change, basically, the point of your experiment
How can you cheat on or get a science fair project done?
Well, what i do is make fake data and if you need pictures of the experiment get them off the computer and call it your pictures. If you for whatever reason cannot get your project done on the last night you can go to freesciencefairproject.com and it will show you answers to your project ;)
Do lighter colored candles have more wax then darker colored one?
light coloured candles do burn faster than darker coloured candles for one main reason. The darker the candle, the more dye molecules are involved in the candle which are non-flammable. Therefore, the lighter the candle, the less dye molecules are involved minimising the risk of the dye molecules interfering with the combustion process.
Participants in an experiment are said to be blind if they are uninformed about?
the experimental hypothesis being tested
Where do you think we humans get energy?
Monsters, rock stars, 5 hour energy you know that type of things and from our food we eat after drinking these things^^^
