Science Experiments

Red litmus paper is used to check for basicity. It turns blue when exposed to bases. Blue litmus paper is used to check for acidity. It turns red when exposed to acids.

it comes from foood like buiscuitand other protein food.

Engineer and Scientist

There are a number of different projects a student can do for the science fair. Some classics include building a working volcano or growing a potato hydroponically. For other ideas, a simple internet search should yield useful results.

The proton of an atom carries the positive charge.

The aleurone layer is the outermost layer of the endosperm. Therefore it is also triploid and same as the ploidy of endosperm.

C6nH(10n+2)O(5n+1) is the formula for maltodextrin. Maltodextrin is a flavorless, easily digested carbohydrate made from cornstarch. The starch is cooked, and then acid and/or enzymes (a process similar to that of the body to digest carbohydrates.

Plants and animals need different things because they have different needs. Plants need sunlight because they make their own food and animals need plants.

CaCo3+O2 -----> CaO2 + CO2

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2nd Opinion: Close, but no cigar. What you want is CaCO3 -----> CaO + CO2

Rather than answer your question directly I'll describe the scientific process.

1. Make an observation: I still get sunburn after swimming even if I use waterproof sunscreen.

2. Form a hypothesis: Waterproof sunscreen washes of just as fast as regular sunscreen.

3. Design an experiment:

3A. Identify an independent variable that you can control: how long I am in the water

3B. Identify a dependent variable that you can measure and that you think will vary in a predictable fashion as you change the independent variable: How much of a burn do I get after an hour in the sun.

4. Perform the experiment and collect data:

4A. Do a control experiment: Compare waterproof sunscreen to regular sunscreen (apply one to one arm and one to the other) and see if they preform similarly without water exposure.

4B. Do the rest of the experiments: Put regular sunscreen on side of your back and waterproof on the other. Sit neck deep in water in the shade for 10 minutes (or however long you choose for your experiment). Every 10 minutes sit higher in the water so that a larger portion of you back with sunscreen is no longer immersed. Mark the water level on your back for each interval. Finally, lie in the sun with your back exposed long enough to start seeing an effect.

5. Analyze the data: Compare the normal sunscreen side to the waterproof side to see if the waterproof side is the same or better.

6. Modify your hypothesis to better explain the data: Water proof sunscreen retains its effectiveness but only if you spend less than an hour in the water.

7. Test your new hypothesis using the method above.

8. If you are satisfied with the predictive ability of your hypothesis you can explore other aspects of the observation: Will swimming versus sitting still in the water effect how long waterproof sunscreen maintains its effectiveness in the water.

If you read through my description you will find the answer to the question posed.

Max L.

It depends on the kind of sugar you are talking about. If you are talking about glucose or fructose, the molecular formula is C6H12O6 (glucose and fructose only differ in structure but have the same formula). Sucrose, which is common table sugar, has the molecular formula C12H22O11.

Scientifically, the word "sugar" is used for any mono- or di-saccharide. Sugar added in food is called sucrose. Sugar naturally found in fruit is called fructose.

I am also doing a science expo right now! The variable can be two things. The independent/manipulated variable is the info u already know. For instant, if u were testing which brand of balls bounced the highest, the types of balls would be the independent variable. The dependent/responding variable is the info u want to find out. For example, in the ladder experiment, the dependent variable would be how high each ball bounced when u tested it. I hope that helps!! =)

The independent variable. Any variable that is kept the same is a constant variable (although it is a contradiction in terms); any variable - usually only one - that depends on the independent variable is a dependent variable.

because they give energy to consumers and all others in the energy pyramid

Fluency (Apex)

Because if no one did than the new knowledge wouldn't be spread in the scientific community, which would mean that there would be no way for other people to retest whatever the experiment or etc... was, and no progress would be made.

The speed of light depends on the electrical properties of the medium (stuff) it's traveling
through. Its speed is maximum in vacuum ... 299,792,458 meters per second ... and it has
different speeds in any material ... e.g., air, water, glass, jello, etc. As long as the light stays
in the same material, its speed doesn't change.

In water, the speed of light depends slightly on the wavelength of the light. For the
wavelength of 400 nm (reddish light), the refractive index of water is about 1.34 ,
so the speed of that light is about 223,700,000 meters per second ... 25.4% less
than it is in vacuum.

If carbon dioxide and oxygen are bubbled through lime water separately the lime water through which carbon dioxide has been bubbled turns milky while the lime water through which oxygen is bubbled remains unaffected.

Movement Occurs When an Object moves Relative to a Stationary Object

Many times these are things that cannot be controlled. Some factors may be temperature, time of day, and the materials that are used.

It depends on the experiment. In one particular experiment, using the technique of measuring volume as a means of counting will work. Think of measuring volume; a tablespoon of sugar or salt. When measuring the volume of it, we are measuring how much space it takes up. This can also be a means of counting because once the molar mass of each element is accounted for, the number of moles (counting!) can be calculated.

fresh water freezes at a higher temperature so should freeze before salt water. This is because when you dissolve substances in water you get freezing point depression this is where they need colder temperature to freeze. So this is why things like jam, vodka won't freeze in most home freezers even though they contain alot of water they also have alot of dissolved substances. Also why salt is spread on roads to melt the ice.

The evidence that exists that marker ink is a mixture is that the ink can be separated into black and other color pigments. This can be done on filter paper by dotting the marker just above the edge and adding ethyl alcohol, which drags the pigments separately across the paper.

the answer is the scientist designs a scientific inquiry