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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
How does a gold leaf electroscope show that an object is charged?
When a charged object is brought near the metal disc of a gold leaf electroscope, electrons move between the metal disc and the gold leaf, causing the gold leaf to become charged with the same type of charge as the object. This results in the gold leaf repelling from the metal disc, indicating that the object is charged.
The most common units for measuring mass are grams (g) and kilograms (kg) in the metric system, and ounces (oz) and pounds (lb) in the imperial system. Mass can also be measured in milligrams (mg) for smaller quantities or metric tons (tonnes) for larger quantities.
Who put the periodic table in order?
It took many years to discover these elements. Hundreds of thousands worked and arranged the Periodic Table of Elements.
The basic design of the periodic table was thought up by Dmitri Mendeleev. It was his idea to arrange the elements according to atomic mass (because this gave repeating patterns of properties). Later it was discovered that atomic charge was what was really important. Eventually the gaps Mendeleev left were filled in by the discovery of more elements, so while many scientist contributed to the modern periodic table Mendeleev is considered to have invented it.
What is the conclusion to the project how does color affect heating by absorption?
The conclusion is a summary of the results. We didn't do the project, so we don't know. You were supposed to do the project, so you SHOULD know. If you didn't do the project, then you deserve to fail.
Some example conclusions, keeping in mind we don't know which (if any) of these is correct and it's not our job (or grade) that depends on them being correct:
- Color has no effect on heating by absorption.
- Green heats the fastest, followed by pink and then paisley.
- The more a color looks like a fire, the faster it heats up. Red, orange, and yellow heat quickly; green, blue, and purple heat slowly.
- Objects the same color as the light source heat most rapidly.
- Objects the exact opposite color of the light source heat most rapidly.
How do make you make a smoking machine for a science fair project?
How to Make a Smoke Machine
Materials:
• Plastic water bottle
• 5 Cotton balls
• Balloon
• Rubber band
• Cigarette
• Matches/Lighter
Procedure:
1. Rinse out the bottle and make sure it is completely dry inside
2. Place the cotton balls inside of the bottle
3. Cut the balloon in half horizontally
4. Stretch balloon over opening of the bottle and secure with a rubber band
5. Cut a tiny hole into the balloon
6. Push the cigarette through the hole
7. Squeeze the bottle to push the air out
8. Light the cigarette while releasing the bottle allowing the air back in
9. Continue to pump the bottle slowly
A pH of 7.4 is considered slightly alkaline, and it is within the normal range for human blood pH (which is typically around 7.35 to 7.45). This pH level is not dangerous for most individuals, as the body has mechanisms to regulate and maintain a stable pH to keep us healthy.
What is the entropy of HCOOH liquid?
The entropy of liquid formic acid (HCOOH) at a specific temperature can be calculated using the third law of thermodynamics and statistical mechanics. The entropy value will depend on the molecular structure, temperature, and specific conditions of the system.
What forces act on something being dropped off a building?
When an object is dropped off a building, the primary forces acting on it are gravity, which pulls the object downward towards the Earth, and air resistance, which acts in the opposite direction of the object's motion and increases as the object falls faster. These forces cause the object to accelerate towards the ground until it reaches a terminal velocity where the force of air resistance equals the force of gravity.
What is the controlled variable of the stroop effect?
The controlled variable of the Stroop effect is typically the list of words that participants are asked to read during the test. This list is controlled to ensure consistency in the stimuli presented to all participants, helping to isolate the effect of interference in the task.
Why do images produced by two opposing flat mirrors apperar to be progressively smaller?
As the reflected image bounces back and forth between the two mirrors, each reflection results in a smaller image due to the angle of reflection. This creates the illusion of the image appearing progressively smaller as it moves further away from the mirrors.
How can 50 mL of one salt solution have more mass than 50 mL of a second salt solution?
The difference in mass between two salt solutions of the same volume can be due to differences in the density of the salts dissolved in the solutions. If one salt is denser than the other, the solution containing the denser salt will have a greater mass for the same volume. Additionally, any impurities, solutes, or additives present in one solution but not the other can also contribute to differences in mass.
Does arginine is an acid or base?
Arginine is a basic amino acid, meaning it tends to donate a proton and accept an electron pair in chemical reactions.
Can you test tooth decay with an egg shell?
No, egg shells and tooth enamel are not the same--tooth enamel is significantly harder. An egg shell may be used as a visual representation of the effects of decay, but it cannot be directly used to test for tooth decay. Professional dental tools and techniques are necessary for accurate diagnosis.
How many times you can fold a square paper?
It's theoretically impossible to fold a standard piece of paper more than seven to eight times due to physical constraints. As the number of folds increases, the thickness of the paper grows exponentially, making it impossible to fold any further.
Does salt water freeze faster than cold?
Salt doesn't make water freeze faster or slower.
Actually, it is not a question of faster or slower, but of the freezing point, or the temperature at which the water freezes. Salt added to water decreases the freezing point. So, on a day when the temperature reaches 32 degrees Fahrenheit, water with salt in it will simply not freeze (this is why fast or slow has nothing to do with it). The more salt, the lower the temperature must go in order for the water to freeze. This is true until the water reaches its saturation point (holds as much as salt as it can in solution), then adding more salt will not make a difference.
What are the names of the national forests in Wisconsin?
Chequamegon National Forest
Nicolet National Forest
Is a solution a mixture or just a solution?
a solution is a mixture as a solution is made only when two substances are mixed together so a solution is definitely a mixture!
How would you find the density of a can of soda pop?
To find the average density of the can and its contents
Weigh the can of soda pop (mass) and then divide by the number of cubic centimeters in the can (volume). Density = mass/volume.
To find the density of the aluminum can
Empty the can completely, weigh it, then place it in a filled liquid container to determine the volume of the aluminum. Divide as above to find the density of the aluminum (should be approximately 2.7 grams per cubic centimeter).
How does carpet friction differ from tile friction?
Carpet friction is generally higher than tile friction due to the texture and softness of the carpet fibers, which provide more resistance to sliding. Tile friction is typically lower as it has a smoother surface that allows for easier movement. Carpet can also provide more grip and traction due to its cushioning effect, while tile can be slicker especially when wet.
Yes, fruit naturally contains sugar in the form of fructose. However, fruits also provide essential nutrients like vitamins, minerals, and dietary fiber. It's important to consume fruit in moderation as part of a balanced diet.
Helium is lighter than air, so it creates lift within the balloon causing it to float. When you blow up a balloon with human air (which mostly consists of nitrogen and oxygen), the balloon is heavier than the surrounding air and therefore falls to the ground.
In an experiment what is controlled variable?
A controlled variable is a factor or condition that is intentionally kept constant and unchanged throughout an experiment. Its purpose is to ensure that any observed effects or changes are due to the manipulated variables and not influenced by other factors.
What happens when you put a balloon in a jar then remove all the air?
If you put an inflated balloon in a jar and then remove the air from the jar the balloon will expand. Perhaps to the point of bursting, or to the point where it coats the entire inner surface of the jar.
Does a wave in a lasso travel as a transverse or longitudinal wave?
It travels as a transverse wave. A longitudinal wave would mean the the rope is stretching and compressing. The fact that you see displacement perpendicular to the rope means it is transverse.
