0
Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
How do you overcome parallax error in an experiment?
Parallax error can be corrected by: > Placing the eye vertically above the marking on the scale to be read. If you are measuring a length of an item, say the length of a book, using a metre-rule, I would advise the following pointers: a) Placing your metre-rule on its edges beside the object to be measured, so the scale is touching it. b) Use a thin rule so that the scale is touching the object to be measured. If you are measuring the volume of liquid in a measuring cylinder for example, make sure you positioned your eye to take readings at the bottom of menicus for water and top of menicus for mercury.
Does the path of an object's projectile motion depend on the angle?
Yes, the angle at which an object is projected affects the path of its projectile motion. A higher launch angle will result in a longer flight time and distance, while a lower launch angle will result in a shorter, more vertical trajectory.
Why do scientists design experiments?
Scientists design experiments to test hypotheses and gather data to support or refute their theories. By designing experiments, scientists can control variables, ensure accuracy and reliability of results, and draw meaningful conclusions based on empirical evidence. Experiments allow scientists to investigate relationships between different factors and understand the natural world better.
Name a characteristic property of water?
Water requires a lot of energy to raise its structure and to evaporate.
Is there any website with answers to Reviewing Earth Science The physical setting questions?
Nope you would just have to buy the teachers edition or simply solve the answers yourself. Sorry.
What happening to sugar when heated from chmistry point?
Well i think you must be knowing a term called bleaching of sugar.Sugar crystals when heated up the breaking point of the bonds(which depends what type of sugar we are using),then the water molecules in it get evaporated and we obtain a black mass of carbon.The reaction is
C12H22011 -------HEAT----------->12C + 11H20
Sugar Black Water
Mass
of Carbon
Difference between chemical and physical change?
A chemical change is when the chemical properties of a substance changes and a physical change is when the chemical properties stay the same but the physical properties (shape, temperature etc...)
because water is generally cold unless heated in a kettle. Coffee on the other hand is warm when you make it so if the water is colder to start with it will take less time to freeze.
Is salt and water a solution or a mixture?
Salt goes into solution in water. That makes a salt and water solution of salt water, unless there is too much salt to completely dissolve in the water. In that case, it will be a mixture of salt and salt water.
Saltwater is technically both a solution and a mixture, since all solutions are mixtures, or physical rather than chemical combinations of substances. However, the more narrow use of the term "mixture" excludes both solutions and alloys.
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.
Is dropping water on Lincoln side of penny a valid experiment?
Not really, the better expiriment would be if you used both sides of t he penny and compare all of your trials.
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.
