0
Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
sensitivity analysis
It is also called "Dimensional Analysis". It is a problem-solving method that uses the fact that any numbers can be multiplied by one without changing its value.
What does HOH mean when it comes to chemistry?
HOH is a representation of Water. H=Hydrogen, of which there are 2, O=Oxygen and there is one. Therefore H2O
Are the incidence ray angle and the reflective ray angle equal?
Absolutely. As a sidenote, always be sure to measure the angle from the normal.
When a substance moves from one state to another what kind of change occurs?
A phase change occurs. This can involve transitions between solid, liquid, and gas states, such as melting, freezing, evaporation, condensation, sublimation, and deposition. During these changes, the particles of the substance reorganize themselves into a different arrangement.
What element make up the carbonyl group?
The carbonyl group is composed of a carbon atom doubly bonded to an oxygen atom. This functional group is commonly found in aldehydes and ketones, where the carbon is also bonded to at least one other atom or group.
Why are a large number of offspring needed to get accurate results in genetic experiments?
Large number can reduce the error. It gives a sharper result
What is zero error of vernier calliper?
A zero error is a non-zero reading shown on a scale when the jaws of the vernier calipers are fully closed and nothing is being measured.
We must align the zeros of the main and vernier scale together. If not able to do so,we should add or subtract according to whether it is a positive or negative error.
What is a hypothesis that has been tested many times and found to be true?
If a hypothesis has been tested many times (using approved experimental methods), and each test has proven the hypothesis to be true, the hypothesis can be taken to be a fact, or truth.
This may start you on the path. It is a simple explanation I developed for a 5th-grade lesson on how scientists use similes. At the time Rutherford was working, scientists had discovered that there were two parts of an atom: protons and electrons. They also knew that protons were much bigger than electrons. A scientist named Thomsen said he thought atoms were like chocolate chip cookies. The protons were like cookie dough, and electrons were mixed in like chocolate chips. Rutherford decided to test this idea. He said that if atoms were like chocolate chip cookies, you could make a wall of atoms - like you could built a wall of chocolate chip cookies -- and shine a beam like a light through them, and the beam wouldn't get through. So he tried in an experiment. He didn't use chocolate chip cookies. Instead he used a really thin sheet of gold, made to be as close to one atom thick as he could. But he found out that when he shone the beam at the gold sheet, most of it went straight through the gold and came out the other side. So atoms could not be like chocolate chip cookies. In fact, atoms seemed mostly to be empty space. So Mr. Rutherford tried to imagine what an atom would look like if it were mostly empty space. He thought of another simile. What if atoms were like the solar system? The sun is much bigger than the planets, like protons are much bigger than neutrons. What if atoms were like really tiny solar systems, with electrons orbiting around a clump of protons in the middle? This explanation would match the results of his experiment. Many years later, other experiments have shown similar results. So now, instead of thinking of atoms as chocolate chip cookies, we think of them as tiny solar systems. This answer can be demonstrated by building a wall of cookies with toothpicks. Shine a flashlight, and light will only come through the cracks. However, in Rutherford's experiment, most of the beam (I believe he used gamma rays) went through and hit the reactive film behind the gold. Now imagine a mobile with "suns" made of ping-pong balls and "planets" made of jelly beans set on toothpicks. (I'm not a millionaire. I have to work with the materials I have.) When you shine a flashlight through the "solar systems" of the nuclear model, most of the light goes right through, as they did in Rutherford's experiment with gold. Based on his experiment, Rutherford decided that atoms are not thickly packed together like rows of cookies. Instead, like our solar system, atoms are mostly made up of empty space. Since we are made of atoms, and atoms are mostly empty space, why doesn't light shine through us? The answer is that we are a _lot_ of atoms think. While sun can shine around one leaf, a tree with many leaves arranged in offset layers blocks the light of the sun to create shade. In this example, the leaves are individual atoms, and the many leaves of the tree are like the many atoms in our bodies. This may start you on the path. It is a simple explanation I developed for a 5th-grade lesson on how scientists use similes. At the time Rutherford was working, scientists had discovered that there were two parts of an atom: protons and electrons. They also knew that protons were much bigger than electrons. A scientist named Thomsen said he thought atoms were like chocolate chip cookies. The protons were like cookie dough, and electrons were mixed in like chocolate chips. Rutherford decided to test this idea. He said that if atoms were like chocolate chip cookies, you could make a wall of atoms - like you could built a wall of chocolate chip cookies -- and shine a beam like a light through them, and the beam wouldn't get through. So he tried in an experiment. He didn't use chocolate chip cookies. Instead he used a really thin sheet of gold, made to be as close to one atom thick as he could. But he found out that when he shone the beam at the gold sheet, most of it went straight through the gold and came out the other side. So atoms could not be like chocolate chip cookies. In fact, atoms seemed mostly to be empty space. So Mr. Rutherford tried to imagine what an atom would look like if it were mostly empty space. He thought of another simile. What if atoms were like the solar system? The sun is much bigger than the planets, like protons are much bigger than neutrons. What if atoms were like really tiny solar systems, with electrons orbiting around a clump of protons in the middle? This explanation would match the results of his experiment. Many years later, other experiments have shown similar results. So now, instead of thinking of atoms as chocolate chip cookies, we think of them as tiny solar systems. This answer can be demonstrated by building a wall of cookies with toothpicks. Shine a flashlight, and light will only come through the cracks. However, in Rutherford's experiment, most of the beam (I believe he used gamma rays) went through and hit the reactive film behind the gold. Now imagine a mobile with "suns" made of ping-pong balls and "planets" made of jelly beans set on toothpicks. (I'm not a millionaire. I have to work with the materials I have.) When you shine a flashlight through the "solar systems" of the nuclear model, most of the light goes right through, as they did in Rutherford's experiment with gold. Based on his experiment, Rutherford decided that atoms are not thickly packed together like rows of cookies. Instead, like our solar system, atoms are mostly made up of empty space. Since we are made of atoms, and atoms are mostly empty space, why doesn't light shine through us? The answer is that we are a _lot_ of atoms think. While sun can shine around one leaf, a tree with many leaves arranged in offset layers blocks the light of the sun to create shade. In this example, the leaves are individual atoms, and the many leaves of the tree are like the many atoms in our bodies. Edited to add my information in case someone finds this useful.
Why does white bread mold faster than wheat bread?
White bread doesn't necessarily mold faster than whole wheat bread. (White bread is usually made from wheat.) It depends upon the formulations, the quality of the ingredients, the processing conditions, storage conditions and the handling by all parties involved.
Check the wheat bread ingredients. If it contains honey, the honey could be acting as an antimicrobial.
In my experiences, yes it has. That is why I always buy wheat bread. And if I do buy white bread I refrigerate it.
Were is minecon with dantdm is it in America?
Minecon, now known as Minecon Live, has been held in various locations, including the United States, but it is not limited to America. DanTDM, a popular Minecraft YouTuber, has participated in Minecon events, which have included both in-person conventions and online streams. The specific location of each Minecon can vary from year to year, so it's best to check the official Minecon announcements for the latest information.
The independent variable is the variable that you change and manipulate in an equation. This causes the dependant variable to change.
