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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
Because when they are in the water, part of their head floats atop so their predators don't see them. It makes it perfect for the sense organs to be on the top part of the head so it can see, hear, and eat its prey, or watch for its predators without being seen.
What are the 3 dichotomies of research?
Is an article/resarech etc.
* at micro or macro level * normative or positive * dealing with forprofit or nonprofit sector
What is a sustance that is formed when two or more different kinds of atoms combine?
Two or more different kinds of atoms chemically combine to form a compound. The atoms make a molecule of that compound, which is the smallest individual component (part or piece) of that substance.
P.S. That makes the answer Molecule.
What is the difference between an exothermic and endothermic reaction?
Exothermic (hyperthermic) reaction: a chemical reaction that releases energy,*
Endothermic (hypothermic) reaction: a chemical reaction that absorbs energy.*
* Energy = heat, light, etc.
The direction of Heat transfer:
Exothermic reactions transfer heat energy to the environment.
Endothermic reactions transfer heat energy from the environment .
What are some sources of the water vapor in the air?
Any body of water ! Like ocean,streams,lakes. That's easy when u study! Lol
Does cool water freeze faster than warm water?
Absolutely. Water must achieve a temperature below 32°F before it can freeze. The closer the water is to room temperature, the quicker it will freeze.
There is a phenomenon in which warm water freezes and cold water not:
In some regions(e.g. Siberia) it is possoble to pour boiling hot water to the ground and it will freeze even before it hits the bottom. This is possible as hot water's molecules are moving more heavily than those of cold water. Therefore the surface of the water is bigger and warmth can leave the molecules faster.
I remember a report of a experiment at one of the university's found hot water froze faster by a inute.
What strange experiment did William Beaumont do with food in 1833?
William Beaumont knew a man named Alexis St. Martin that had a hole in his stomach from a gunshot wound that never fully healed. Since the wound never healed you could see the inside of the stomach. So William Beaumont watched the food being digested. And then had a better understanding of how digestion works.
HE WAS NOT THE GUY THAT SWALLOWED THE STRING!~
Did Albert Hoffman self experiment with LSD only once?
Yes, many times in order to discover the effect LSD had over the humans.
Does salt dissolve in water faster than sugar?
yes.The chemical structure of salt(NaCl) is simpler than that of the sugar (C6H12O6)
Why is it difficult to remove sticky marks using water?
simple - it because water will not remove the stickiness, it simply makes it harder to get off, because then you have a wet and still sticky label.
From,
Sophie
replication
What is easy science project for a 14 year old?
Something about yeast is a good one, or diffusion of tea-bags
Potential sources of error in experiment permeability test falling head method?
1. The permeability results might be localized due to excavation.
2. Lateral permeability not considered which may lead to erroneous estimate of field permeability.
What are the measures taken to prevent adulteration?
- first of all food should be tested and then consumed.
- government should stop working of company that take part in adulteration.
The extinction spectra is actually the measurement of light absorption in different mediums. This spectra is used in chemistry and biochemistry.
Do girls experiment at slumber parties?
At young ages 13-14 it has known to be common to experiment slightly, yes.
Yes? There is always a chance that experimental results happened by chance (something called a Type I error in Statistics which is bad, but over-emphasized). Replications (which are not done often enough) help protect us against such "accidental" effects because reproducing the results by chance is FAR less likely than just getting them once by chance. But reproducing REAL effects should be quite easy. Though if it is the same scientist, in the same lab, it is possible the results can be replicated even when they shouldn't be replicated, not by chance, but because of something systematic (dirty or faulty equipment, poor randomization, experimenter accidently communicates something to the participant, ...).
condition that changes in response to the manipulated variable in an experiment.
How do you finish a science project in one day?
You can ask for help or never take a break while doing the project and dont even sleep
The best thing to do is to get your colleagues and friends to help you with the project so that you all get it done. Always take a break when you feel tired, because that way it will help you work better afterwards. But don't get too lazy!
What are the parts of an experiment write-up?
The basic steps that are included in an experimental write-up :
- Introduction
- Purpose
- Hypothesis
- Methods and materials
- Data and results
- Discussion and conclusion
- Appendices.
Details about different methods of separation of components of a mixture?
Fitrate.
Decantation-Decantation is a very quick method for separating a mixture of a liquid and a heavier solid.
Filtration-This is a method which is the most especially effective for separating suspensions, for example mud in water. We pour the mixture into a funnel fitted with a piece of filter paper. There are tiny holes in the filter paper for the liquid to pass through, the solid particles are too large to do so, therefore the solid particles will stay on the paper as what we called a solid residue. We called the liquid which pass through the FILTRATE.
Centrifugation-Centrifugation is used when we want to separate small amounts of suspension. The suspension of solid in liquid is poured into a centrifuge tube, then spin around very fast in a centrifuge. The spinning motion forces the solid to the bottom of the tube. Then the liquid can be poured off from the solid.
Evaporation-We cannot separate a mixture which is a solution using filtration or centrifugation. Since it is spread all through the solvent in tiny particles. The solution is heated so that the solvent evaporates, and just leave the solid behind.
Crystallization -It is a process of forming crystals. It is also a method for separating dissolved solids from a solution.
Distillation -When a solution of solid in liquid is heated, the liquid will evaporates. The hot vapor that formed can de condensed back to liquid again on a cold surface. We called this method DISTILLATION. Distillation is used for separating a solvent from a solution. We called the liquid collected a distillate.
Separating Funnel -Immiscible liquids,such as oil and water can be separated by using a separating funnel. The mixture is put into a separating funnel, shaken and allowed to settle. The oil and water from two separate layer. The liquid with higher density, in this case water forms the lower layer. Remove the stopper and open the tap after standing. The water runs out through the tap. The oil remains in the funnel and can be run out into another beaker.
Fractional Distillation -Miscible liquids are much more difficult to separate. Mixtures of miscible liquids can be separated by fractional distillation. It will provide the boiling points of the liquids are not too close.
Sublimation -Some solids can change to vapor state without melting when heated. We called it SUBLIMATION. When the vapor is cooled, the solid forms again. We often use sublimation to separate a mixture of two solids in which one sublimes, but the other does not. For example, iodine from a mixture of sand and iodine by sublimation. When heated, only iodine changes to vapor. The vapor changes back to solid on the side of the funnel.
What does total magnification mean?
Total magnification means enlarging something in terms of appearance to the full extent. This is the measure of how many times bigger something can get compared to actual size.
What are the controls in an experiment?
Well basically the "control" group is the part of the procedure or experiment where the specimen or whatever your testing is separated from everything else and nothing is done to it, so you have something to compare your other results to.
Milk can easily be spoilt. Especially liquid milk can be spoiled by mixing with other liquids such as juice and cool-aid and also solids such as bread and snackers
which as solid milk or milk powder may not spoil so easily
