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Scientific Method
The scientific method is the basis of scientific investigation. A scientist will pose a question and formulate a hypothesis as a potential explanation or answer to the question. The hypothesis will be tested through a series of experiments. The results of the experiments will either prove or disprove the hypothesis. This category should contain questions and answers regarding the scientific method.
4,392 Questions
What tools could be used to check for correct bearing preload using the rolling torque method?
Tools to check correct bearing preload using the rolling torque method include a torque wrench, dial gauge, or a special tool designed for bearing preload measurement. These tools help in accurately measuring the amount of torque required to rotate the bearing, ensuring the correct amount of preload is applied. Additionally, proper training and experience are essential for accurate interpretation of the results obtained from these tools.
Is it true a physical change never alters the form or appearance of a substance?
No, a physical change can alter the form or appearance of a substance without changing its chemical composition. For example, melting ice changes its form from solid to liquid without altering its chemical composition.
Why do you need to add the eggs slowly when using the creaming method?
Adding eggs slowly helps emulsify the mixture by allowing them to incorporate evenly with the fat and sugar. This creates a stable and smooth batter, resulting in a more uniform and light texture in the final baked good.
10 things that do not dissolve in water?
pepper, sand, dirt, paper, plants, metals, hair, wood, lead, cotton.
How many minutes does it takes sugar to dissolve in warm temperature water?
How much sugar, how much water, how warm is "warm", are you stirring it or not, is the sugar powdered, in the form of small crystals, in the form of rock candy ... there are so many variables that it is impossible to give an answer to a question this vague.
However, even if you had given that information, this is not something that scientists are usually terribly interested in. We generally assume that if you're trying to dissolve something you will first get it in a reasonably finely divided form and stir, and it takes however long it takes. How much sugar can you dissolve in a liter of water at 25 degrees ... that's a question that someone somewhere has recorded the answer to. How long it took is generally of considerably less interest, and finding that information would be much harder... probably harder than actually getting some sugar, and some water, and doing the experiment yourself.
What is an example of an expanded structural formula for a cyclic compound?
An example of an expanded structural formula for a cyclic compound is cyclohexane, which is a six-carbon ring with all single bonds. The expanded structural formula would show all the carbon and hydrogen atoms in the ring, along with the single bonds between them.
What is the most precise method in recording data points during experiment?
Using electronic sensors and data loggers connected to a computer is considered one of the most precise methods for recording data points during an experiment. This method eliminates human error and ensures accurate and real-time data collection. Additionally, using software to automate data logging can help streamline the process and improve data accuracy.
Can a pear conduct electricity better than a lemon?
Yes! Not many people know this, but it actually can. I had tons of fruits + a potato in my science project, which was to see what would produce the most electricity. My hypothesis, was of course, a lemon, but I came to see that somehow, the pear was higher than everything else, even the potato! With interest, I finished the project.
What variable is the only variable that is purposely changed to test the hypothesis?
This variable is chosen by the research team according to the experiment project.
Which step of scientific method do you perform after you form a hypothesis?
After forming a hypothesis, the next step in the scientific method is to design and conduct an experiment to test the hypothesis. This involves collecting data and analyzing the results to determine if the hypothesis is supported or refuted.
Some scientific data are obtained through observation rather than experimental results?
Yes, observational data in science are gathered by systematically watching and recording phenomena without intervening or manipulating variables. This approach is common in fields like astronomy, ecology, and anthropology where it may be impossible or unethical to conduct experiments. Observational data play a vital role in generating hypotheses and understanding complex systems in the natural world.
To prepare soybean milk, soak soybeans overnight, blend with water, strain the mixture, and heat the liquid. When compared to natural milk for curd formation, soybean milk may have a different curdling process due to its composition of plant-based proteins. Temperature can affect the curdling process in both types of milk, with soybean milk potentially requiring higher temperatures to curdle compared to natural milk. Conduct experiments at different temperatures to observe and compare the curd formation in both types of milk.
How do you repair an electric fan using scientific method?
To repair an electric fan using the scientific method, follow these steps:
- Observe the fan's problem: Is it not turning on, making strange noises, or running slowly?
- Form a hypothesis about what might be causing the issue, such as a faulty motor, loose wiring, or a broken switch.
- Test your hypothesis by checking the motor, wiring, and switch connections.
- Analyze the results of your tests and draw a conclusion on what needs to be repaired or replaced to fix the fan.
Method used when locating ones position?
One method used to locate one's position is by utilizing a Global Positioning System (GPS) device, which receives signals from satellites to determine and display the user's precise location. Other methods include using landmarks, maps, compasses, and techniques like triangulation or dead reckoning to determine position relative to known reference points.
Plate boundaries are the edges where two tectonic plates meet. They can be divergent (moving apart), convergent (moving toward each other), or transform (sliding past each other). Plate boundaries are dynamic regions where most earthquakes, volcanic activity, and mountain-building processes occur.
What purification method wa used in the experiment preparation of iodoform?
The purification method used in the preparation of iodoform in the experiment is recrystallization. This process involves dissolving the impure iodoform in a solvent at an elevated temperature and then slowly cooling the solution to allow pure iodoform crystals to form and separate from the impurities.
Mendeleev's periodic table allowed for the prediction of the properties of unknown elements by identifying gaps in the table where elements had not yet been discovered. By examining the properties of neighboring elements, Mendeleev was able to predict the properties of the missing elements and suggest their existence. His periodic table provided a framework for organizing elements based on their atomic mass and chemical properties, which allowed for the accurate prediction of the properties of undiscovered elements.
How are two liquids separated using distillation?
Liquids can be separated by distillation because they have different boiling or condensation points. Alcohol boils at a lower temperature than water so the mixture is heated to the boiling point of alcohol and it leaves the mixture as a vapor (like steam) and is then cooled to become liquid again.
In the case of petroleum the crude oil is heated and turns into a vapor. The vapor it allowed to rise in a tall tube (called a cracking tower because it breaks the oil vapor apart), As the vapor rises in the tube it becomes cooler and cooler. Different constituents of the vapor turn back into a liquid at different (cooler) heights in the tube. The liquid from the different heights is captured and drained into different tanks than the other liquids.
Who plays Stephanie from the next step?
Shelby Bain plays Stephanie on The Next Step. She is a Canadian actress known for her role on the popular dance-themed television series.
What products can be made using the melting method?
Products that can be made using the melting method include candles, soaps, chocolates, and certain types of cosmetics like lip balms and lotions. This method involves melting ingredients together, which are then poured into molds to solidify into the desired shape.
Why is the burning of wax an irreversible reaction?
When the candle is burned, chemical reactions take place between the wax and oxygen. These chemical reactions release energy in the form of heat and light. These reactions are not going to easily be run backwards. If they did, we might have candles popping up all over the place....
On the other hand, melting the wax is just a phase change. The physical properties change, but the chemical properties do not. Since the wax melts because the temperature of the wax is raised, once the heat source is removed, the wax will begin to lose heat, assuming that ambient temperature is low enough. Eventually, the wax will go through another phase change and become solid.
So, the short answer is: burning is irreversible because it involves a chemical reaction, while melting is reversible because it's just a phase change. The caveat is: the chemical reaction is reversible too. Ever wonder where your ear wax comes from? Candles and crayons aren't a part of a normal diet....
A physical change is when the same compound/chemical just changes form, for example, water experiences physical changes when it goes from ice to liquid to steam. The identity of the compound is completely unchanged however.
A chemical change is one where bonds have changed, therefore the molecule that existed the change is now a completely different molecule. For example, burning glucose in oxygen gives you carbon dioxide and water. Notice the glucose has combined with the oxygen to form completely new chemicals, i.e. CO2 and H2O. (It is worth remembering that burning is a chemical reaction with oxygen).
So in your example, the flame melts the wax and there is a physical change occurring. The wax goes from solid to liquid, but it is always wax, just in different forms If the melted was cools again, it will go back to being the same solid wax as before. When the wax burns, and the wax combines with the oxygen to form CO2, carbon monoxide, carbon particles (incomplete burning/oxidation) and water. After it burns, you can't get the wax back! The burning has broken the bonds in the wax and made new compounds.
Note that when a candle burns, the wax does two things. First it melts, and then it burns. What burns is actually melted wax! The heat of the candle melts the nearby wax, and that melted wax is absorbed by the candle's wick. The melted wax burns on the wick -- the wick itself isn't burning, just the wax on it. However, as the candle burns down, what happens is there isn't enough wax nearby to melt, and so the end of the wick does burn a little, which is why it slowly gets shorter (at the same speed as the candle gets shorter).
It is a chemical change because there is new matter created but flammability is more of a property than a chemical change. A physical change is still the same matter but is in a different form like cutting paper. Its still paper. But if you burn paper, that's a chemical change because its new matter now and its really hard to change back
Yes, it is acetic acid and on heating with soda-lime (CaO+NaOH) produces Methane the ist member of alkanes.
Dose hot boil faster than cold water?
Yes, hot water boils faster than cold water because the molecules in hot water have more energy and are already closer to the boiling point. This means it takes less time and energy to raise the temperature of hot water to the boiling point compared to cold water.
Why is a scientific law called a law?
A scientific law is called a law because it is a statement based on repeated experimental observations that describe a natural phenomenon. It is a fundamental principle that has been universally accepted as true within a specific field of study. Laws help to predict and understand the behavior of the natural world.
Galileo's methodology, which involved observation, experimentation, and mathematical analysis, helped shift the focus of science from relying solely on philosophical arguments to empirical evidence. He emphasized the importance of testing hypotheses through reproducible experiments, which is a fundamental aspect of the scientific method. Galileo's work laid the foundation for modern physics by promoting a methodological approach based on observation and experimentation.
