Science Experiments

the volume increases, the same way water takes up more room then ice.

One newton is equal to the force imparting acceleration of 1 m/sec/sec to a mass of 1,000 grams.

A factor in an experiment that can change is called a variable. Variables are used in experiments to test a hypothesis, and someone will manipulate the variable, while keeping something else the same, a control, in order to see how the variables react in comparison with a control.

I'm guessing that you've got the same science homework as me. It's Iron (or in jumble). Also, I checked on the reactivity series to find out which ones were in the middle, which are Zinc and Iron.

Ultraviolet (UV) light has a higher frequency (and a shorter wavelength and shorter period) than violet light. It is more energetic, too. We can't see UV light as our eyes only see up through violet. The shorter wavelengths of the UV light are something we cannot detect with our eyes. We can see (in order of increasing frequency) red, orange, yellow, green, blue and violet light. The UV light is outside the range of our vision.

Controlled experiment.

The thing you change is called the independent variable and the constants are the dependent variables. By only changing the independent variable, any results can be attributed to this.

you can do your exit project on the cold civil rights movement;modern women's movement;american tragedies;and US politics & political scandals

- vivi♥

form rebekah,

OK well i am in the 8th grade now and what i did for my 7th grade project is i did Princess Diana and how she died. But this year i am doing The Great Wall of China and what is meant to people in china. But yes the modern women's movement is a great subject. It explains what women went through in the 1970's from the sixties. About the sexual harassment, domestic violence e.x its a great subject. My sister actually did that for her 8th grade project and she made second place goo sister. i would choose either the great wall or the modern women's movement.

electrisity comes from big electricity generators .

Can be found via electron scattering. Hofstander from Stanford got the Nobel prize for it.

rho(r) = rho0 / (1 +Exp[(r - a)]/b)

The parameter b is a measure of the surface thickness.

A science experiment is when you don't know the outcome ahead of time, and perform tests to figure out the outcome. A science project is when you know what the results are SUPPOSED to be and then try to duplicate them from theory to reality.

Yes, salt (sodium chloride) dissolves in water. When salt is added to water, the water molecules surround the salt ions, breaking the ionic bonds and pulling the salt apart. This results in a clear, homogeneous solution with the salt evenly distributed throughout the water.

so you can try to see exactly which factors are affecting the dependent variable (the thing you're measuring) "it gives you something to compare your results to" is the basic Y9-GCSE answer =]

To make an experiment more accurate, repeat the experiment several times. If you do it 5 times there could be one or two anomalous, however do it 10, 15, 20 or 100 times you would find that about 95% of your results say one thing and that 5% say another, then your experiment will be dead accurate.

Volcanoes only occur on the boundaries between tectonic plates, and this is the same for earthquakes. this is why there are many volcanoes and earthquakes in Indonesia and the south east Asia region, but very few any where in Europe or Antarctica. So volcanoes don't occur within a tectonic plate.

Tuberculosis is caused by a bacteria which has no nucleus. It has DNA, but it is not found inside a membrane such as we have in our cells.

Physical Properties of Iron

1. Boils at 2750°C

2. Iron's density is 7.874g/cc

3. It is silver- white when pure

4. Its atomic mass is 55.847

5. It reflect 65% of the light that hits it

Chemical Properties of Iron

1. Oxidizes in damp air

2. It dissolves quickly in dilute acids

4. It corrodes fast in high temperatures

5.When iron is exposed to air it reacts with oxygen

to form hydrated ferric oxide on its surface (rust).

X-Rays can penetrate all metals, but not very far. The penetration depth is strongly dependent on how dense the metal is. Lead, for example, is a better X-ray stopper than aluminum. There are tables that allow an investigator to find the half-value layer for different substances. These references will give the thickness of a given material needed to reduce an incident beam by 50%.

To comare and contrast the differences and similarites.Im not really sure if this is right becuz i had the same question so ill see th votes in a few.Well wish me and u good luck cuz for me its due on monday

gas matter's characteristics is GAS

By repeating the experiment and getting the same results it validates those results.

It starts to wither up and leaves start to drop like it's begging for water.

Brine elctrolysis is where a solution of sodium chloride (common table salt) dissolved in water is broken down into chlorine gas, hydrogen gas, hydroxide ions and sodium ions by passing and elctrical curren through the solution. The chlorine gas will liberate at the cathode and hydogen at the anode, and the two ions produced will combine to form a solution of sodium hydroxide, a very strong alkali which has many applications. (The NaOH solution will be, when the reaction is complete, in place of the NaCl solution). Hope this is useful!!

They don't. Sulphur has about twice the atomic mass of oxygen.