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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
What is the most important thing to consider when designing a experiment?
We have no way of reading your teacher's mind to guess what he or she might have been thinking in asking such a nebulous question as this. The answer your teacher is expecting is probably contained within your reading assigment, and I strongly recommend that you search it to avoid losing points.
However, the primary thing (in my opinion) that you need to remember when conducting a controlled experiment is to control the experiment. Don't introduce multiple variables unless you have to, make the experiment "double-blind" to the extent possible (if your control group is getting sugar cubes while the experimental group is getting something that tastes like cotton balls dipped in alum, somebody's gonna notice), et cetera.
A huge variety of common items along with chemicals dissolve in water. Sugar and salt will both dissolve in water, although at different rates.
What is the current atom model?
- A dense nucleus of protons and neutrons surrounded by electron clouds of different shapes and sizes.
If you add an extra battery to a circuit containing a bulb how will this affect the bulb?
The bulb becomes brighter unless it is too much till it shot-circuits.
What is a a possible explanation for a set of observations or answer to a scientific question?
In the scientific world that could be a theory, hypothesis, qualitative observation, prediction, or an inference. You can choose one.
There are three types of levers.
- there is first class levers were the fulcrum is in the middle and the load and effort are on the sides.
- also there is second class levers were the load is in the middle and the effort and fulcrum are either of the sides.
- last but not least there is third class the effort is in the middle and the fulcrum and load are on any side. :)
first class
second class
and third class
class 1 lever like a fork or hammer. class 2 lever like a nut-cracker or a door.. and a class 3 lever such as tweezers, or a golf club...
When a hypothesis is supported by many different experiments it is considered a?
The explanation supported by many experiments is called scientific theory.
The color of the light is determined by what of the light waves?
The colour of an object is determined by the wavelengths of light it reflects. An object that is purley one wavelength (lets say a specific wavelength in the blue part of the spectrum) would be absorbing all visable wavelengths except that specific blue wavelength.
Pasteur's experiment permitted air from the outside to mix with air from the inside, which would
have allowed any "vital force" to enter and cause
the broth to become cloudy if there were such a
"vital force.
One way is to cut a piece of construction paper, staple equal-sized streamers on one side in a row ( ten is a good amount), then form a circle with the paper and staple it. Make at least 3 (6 would be better), equally spaced holes, with a hole-punch. Attach a string to each hole, tie a knot in all the strings at once, so that all the strings are equal in length and attach it to a pole (the taller, the better).
What happens when you put a chicken bone in vinegar?
When you soak bones in vinegar what will happen is that the chicken bone will weaken and the bone will become more flexible. So after soaking the chicken bone into vinegar for a week the bone will be so flexible that it will be able to bend. This is a great science fair project also.
A plant or animal that lives on or within another living organism at the expense of that organism?
an organism is a baby means a baby lives in another organism which is the mother.
How does the mass of ice cubes affect its melting time?
Yes.
Keep in mind that it takes one BTU to reduce or increase the temperature of one cm3 water by one degree celsius.
Per physics, cold moves toward hot, so the temperature of the ice can be said to move into the temperature of the water. (This can help you visualize the process).
As the ice melts, it cools the water around it. The greater the volume, the longer the cooling process takes. This is also affected by the surface area and the amount of it in contact with the water.
To break it down simply, the greater the volume of water, the faster the ice will melt.
Which physical state is described as having a variable shape and variable volume?
The volume of a gas is subject to change with temperature and pressure.
What materials can be used to make a parachute?
Why is it important to limit the variables in an experiment?
To understand this you need to remember that the independent variable is a condition that you can change, and the dependent variable is the outcome that you see.
If you have two independent variables, and you change both during an experiment, how are you going to tell which one caused the change to the outcome?
So, you only change one independent variable at a time.
What is a good science fair project for sixth grade?
This science project has to do with space, more specific, the sun. It's called "Sun Shadows." It's an activity that teaches kids how the sun tells us what time it is.
The things you need are:
White paper
Note pad (Activity log)
Large paper clip
Pencil
Transparent tape
What to do:
#1: Bend one side of the paper clip to make a stand.
#2: Stick the paper clip through the center of the paper.
#3: Tape the base to the back side of the paper.
#4: Place the paper on a flat, smooth surface where the sun will shine on it. Make sure it won't be disturbed all day. Use tape or a pencil to mark the paper's exact location on the ground or table.
#5: At 10:00 A.M., carefully trace the paper clip'sshadow. Put a heavy dot on the tip of the tracing. Repeat at 11:00 A.M., 12:00 P.M., and 1:00 P.M. Label your tracings with the times.
#6: Predict where you think the tip of the shadow would be at 9:00 A.M. and at 2:00 P.M. Mark these predicted points on the paper.
#7: Return the paper to its marked location the next day. Trace the actual shadows at 9:00 A.M. and 2:00 P.M.
Ask the following questions to your 4th graders and have them write their observations in their Activity log.
What Happened?
1. On the 1st day, what did you observe? What did the shadow do?
2. When was the shadow longest? When was it the shortest?
3. How much did the shadows change from the 1st day to the 2nd day?
What Now?
1. How could you use a shadow to tell the time of day?
2. Does the change in the shadow length from day to day create a problem with telling time? Explain your answer.
3. How accurate were your predictions? What could you do to make them more accurate?
4. How could you tell the time on a cloudy day?
5. What patterns in the sky affect shadows?
Hope you have fun with this project!
- Tinkomonk
A mixture of substances that may explode under the right circumstances.
Powdered flour dispersed thru air will explode if a spark is present.
Gunpowder is an explosive mixture, not a compound.
Nitroglycerine is NOT an explosive mixture. It is an explosive compound.
Why should you light the match first then turn on the gas?
Because, if you're distracted (and thus delayed) after you turn on the gas, there could be a build-up which may explode ! Lighting the match before turning on the gas supply, means any escaping gas will quickly ignite.
How many variables do you need in a science experiment?
Ideally, an experiment should test only one variable (the independent variable) at a time.
If you have two or more variables changing at the same time you have no way of knowing which variable is causing your results.
How do white candles become white?
That depends on its size, shape, and composition. The color is pretty irrelevant except that it is influenced by the composition. There is a lot of urban folklore out there about different colored candles burning at different rates, but it is not the color that matters.
