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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
What are the steps to prove that a burning of a candle is physical as well as a chemical change?
To prove that the burning of a candle is a physical and chemical change, you can observe the physical changes such as the melting of the wax and the formation of soot. Additionally, you can analyze the chemical changes by noting the production of carbon dioxide and water vapor during the combustion process. By observing both physical and chemical changes, you can demonstrate that burning a candle involves both types of transformations.
If the chemical symbol is Yb what is the element?
The element yttrium has the symbol Y. This element and the element ytterbium (Yb) are both named for a quarry town in Sweden (Ytterby).
What is the name of prokaryotic reproduction?
By atomically fusing with the gametes using spontaneous generation. The prupose of the fusion is so that the ionic bonding can multiply and the gametes are then able to rotate and then fuse to form the eukaryote for reproduction.
Can a chalk dust be a chalk again?
No, once chalk dust has been created from a chalk stick, it cannot be transformed back into a solid piece of chalk. The dust particles are broken down and cannot reassemble into a solid form.
Why do farmers use wind vanes?
Farmers use wind vanes to determine the wind direction on their farms. Knowing the wind direction can help them make decisions related to crop spraying, irrigation, and planting. It also aids in managing the spread of pests and diseases.
An effect of bias is that it can lead to unfair treatment or decisions based on prejudice rather than objective factors. This can result in inequality, discrimination, and social division.
What is a parallel electric circuit?
A parallel electrical circuit is a circuit coming from the same place as another circuit but that runs alongside of the first circuit.
This is a poor analogy, but the best I could do on the spur of the moment
If two or more cars enter the freeway at the same spot and stay in the same lane they are a series circuit. If one car pulls out and runs beside the second car, they are a parallel circuit. The lanes represent different wires, and the cars represent the current traveling through the wire(s).
In a series circuit the total current runs through each device, In a parallel circuit the current divides , and each part runs through a different device, or wire.
Got a sore throat? Wonder if your painful sore throat is from a cold, strep throat, ortonsillitis? Here's how to tell.
What's the difference between a cold, strep throat, and tonsillitis?A sore throat is often the first sign of a cold. However, a sore throat from a cold often gets better or goes away after the first day or two. Other cold symptomssuch as a runny nose and congestion may follow the sore throat.
Strep throat, which is caused by Streptococcus bacteria, is one of the major causes of sore throat and tonsillitis. With strep throat, the sore throat is often more severe and persists. While a cold goes away on its own, strep throat usually requires antibiotics.
Tonsillitis is a painful infection of the tonsils, the tissue masses located at the back of the throat.
Is a sore throat with a cold caused by a virus or bacteria?Sore throats can be caused by viruses or bacteria. To determine the cause of your sore throat, your doctor may do a strep test. However, there may be some clues. Viral sore throats are often accompanied by other cold symptoms that may include a runny nose, cough, red or watery eyes, and sneezing.
Along with a sore throat, what are other cold symptoms?Other cold symptoms include the following:
- Runny nose
- Sneezing
- Cough
- Headache
- Nasal congestion
- Fever, which may or may not be present and which is more likely in children
While there is no cure for a sore throat caused by a cold virus, to speed healing of your sore throat and cold, be sure to get enough rest. Eating a healthy diet and drinking plenty of fluids can also help speed healing.
Can medications relieve symptoms of a sore throat with a cold?Over-the-counter cold medications may relieve cold and sore throat symptoms. However, the benefits of these medications are minimal. Some cold medications include the following:
- Pain relievers, such as acetaminophen and ibuprofen, to relieve the aches and pains of a cold and sore throat. (Aspirin should not be given to children under the age of 18 because of its link to Reye's syndrome, a disorder that mostly affects children 4 to 12 years old and causes brain damage and death.)
- Sore throat sprays and lozenges to soothe your throat and numb the throat pain temporarily.
- Decongestant nasal sprays to relieve a sore throat caused by postnasal drip -- nasal drainage that runs down your throat. (Be sure to stop using nasal decongestant sprays after 3 days, or you may have an increase in congestion when you stop them.)
Antibiotics should not be used to treat a cold virus and sore throat. Antibiotics are effective only against bacteria. They will not work on sore throats associated with colds, which are caused by viruses, and may cause future infections to be worse and last longer.
What happens to low density water?
If the low density water was put over another fluid of lower density it would sink but if it was put over a high density fluid like mercury it would floats.
How do you speed up salt water evaporation?
To speed up salt water evaporation, increase the temperature of the water, increase the surface area exposed to air, and increase air circulation around the water. Additionally, using a low-humidity environment can also help accelerate the evaporation process.
What are two functions of lipids in bacterial cells?
Primarily they are the main component of a Cell's membrane - bacterial & otherwise.
When a Cell grows it must also grow an excess of Cell membrane to allow the bi-lipid layer to encompass the 'X, Y and Z - 360 degree perimeter' of both of the daughter Cells. This same process applies equally to Eukaryotic Cells.
The cellulose-ic Cell Wall is what appears exterior to the bacterial Cell membrane, while eukaryotic Cells typically protect themselves with a glyco-protein Coat. Note that the bi-lipid layer is common to both.
What factor distinguishes the expermental group from the control group?
The factor that distinguishes the experimental group from the control group is that the experimental group is subjected to the experimental treatment or intervention being studied, while the control group does not receive this treatment and is used as a baseline for comparison.
Are wooden floors smoother than cement floors?
Wooden floors are generally smoother to the touch than cement floors. Wood has a natural warmth and smoothness that can feel more comfortable underfoot compared to the colder and harder surface of cement. However, the smoothness can vary depending on the type of wood and finish used.
Elements combine in a specific proportion?
Chemical elements combine in specific ratios to form compounds. This is governed by the principles of stoichiometry and reflects the fixed ratio of atoms in a compound's chemical formula. The specific proportion of elements in a compound determines its properties and behavior.
Chalk is calcium carbonate. Cola is an acid. When these two compounds mixed, hydrogen carbonate is formed. This compound is water soluble, and thus chalk mixed with and acid like cola dissolves in water.
How does peer review help keep scientists honest?
Peer review involves a number of scientists looking at each other's work. It can involve trying to replicate the claimed results. If the method and results appear to be correct, logical, without flaws the next step is to try to get the same results again to verify the results. This second step can be time consuming if the original research lasted over a number of years. Fraudulent claims are usually discovered but sometimes not until the public has been mislead.
Is it true that a constant is the factor being measured in an experiment?
No, a constant in an experiment is a factor that remains the same throughout the experiment to ensure that any changes in the results are due to the manipulated variables and not external factors. The factor being measured in an experiment is typically referred to as the dependent variable, which is the outcome or response that is being observed and measured.
What metal turns into salt in chlorine gas?
Common salt has the chemical name sodium chloride. Therefore, the metal is sodium.
DNA strands held together by hrydrogen bonds are separated by an?
I wanna say deoxyribose but I'm not completely sure
How can you demonstrate that light travels in a staight line until it strikes an object?
Take a toilet tissue or paper towel roll, cut a hole (small circle) at one end you'll label "top" but leave the flap on. (If not just use a small piece of cardboard to temporarily cover the hole.) Shine a small flashlight through the tube... it goes through the tube. Now, block off the end with heavy cardboard and uncover the hole you made. The light should now shine through the 'top' hole.
Where can you buy fizzing tablets?
You can buy fizzing tablets at most drugstores, pharmacies, grocery stores, or online retailers that sell health and wellness products. Look for them in the vitamins and supplements section, often marketed as effervescent tablets or fizzy tablets.
What chemical reaction take place when acid rain damages buildings made of carbonate rocks?
When acid rain comes into contact with buildings made of carbonate rocks (such as limestone or marble), a chemical reaction occurs where the calcium carbonate in the rock reacts with the acid rain (which contains sulfuric acid and nitric acid) to form calcium sulfate, carbon dioxide, and water. This process is known as chemical weathering, where the acid rain slowly dissolves and breaks down the carbonate rock, leading to structural damage over time.
How do you find the hardness of a given water sample without using EDTA?
mention the salts causing temporary and permaneat hardness
How long does it take for an iron filling to rust?
Iron fillings can start to rust or oxidize in a matter of hours or days, depending on the humidity levels and presence of oxygen in the environment. The process of rusting occurs when iron reacts with oxygen and water, forming iron oxide.
