Science Experiments

The concept of vacuum was first discovered by Greek philosopher Democritus in the 5th century BC. However, it was not until the 17th century that Evangelista Torricelli created the first artificial vacuum using a mercury barometer.

Teeth have a wedge shape that helps them to break down food by exerting force on it, splitting it apart. The sharp edge of the teeth acts as a wedge to cut through food when we chew. This wedge shape helps in the initial breakdown of food for digestion.

The solvent is the liquid you will be using if you are dissolving something in the experiment.

Candy dissolves in water because it is mostly sugar, which is a polar molecule. When candy is added to water, the water molecules surround and interact with the sugar molecules, breaking them apart and dispersing them throughout the water. This process is called dissolution.

Try:

http://biology.about.com/od/cellularprocesses/a/cellrespiration.htm

or find a good revision PowerPoint on:

http://www.slideshare.net/scuffruff/revision-respiration

Also bitesize may be helpful but is a bit unrelated to your topic:

http://www.bbc.co.UK/Scotland/learning/bitesize/higher/biology/cell_biology/

Hope i helped :)

Carbon dioxide is created when oxygen and carbon are combined. The respiratory system allows oxygen to be taken into the body while allowing the body to push out (or exhale) the carbon dioxide.

acceleration due to gravity, causing it to increase its speed at a constant rate. This acceleration is approximately 9.81 meters per second squared.

Scented candles contain fragrance oils or essential oils that add a specific scent, while unscented candles do not have any fragrance added. The oils in scented candles can affect the burning characteristics of the wax and may require additional additives for proper scent dispersal.

Yes, an egg will shrink in syrup because the syrup has a higher concentration of sugar than the egg, creating a higher osmotic pressure in the syrup causing water to move out of the egg into the syrup. This loss of water from the egg will cause it to shrink.

A hypothesis states a predicted outcome for an experiment, while an experiment is designed to test the validity of the hypothesis by collecting data and analyzing results. The experiment provides empirical evidence to either support or refute the hypothesis. The relationship between hypothesis and experiment is crucial in the scientific method for forming and testing ideas.

true or false : in order to get the best results from an experiment, change as many variables as possible within the experiment?

To calculate this, you first need to determine the mass of pure iron in 454.0 grams. This is done by multiplying 454.0 grams by 0.35 (the decimal equivalent of 35.00%). This gives 158.9 grams of pure iron. To find out how many grams of ore is needed, you need to set up the equation 0.35 * Mass of ore = 158.9 grams, which gives you 454 grams of ore needed.

Yes. In very small amounts.Sodium chloride is salt, applied at about 1 part to 1,000 salt to soil it can have a slight fertilising effect, but used at 1lb to a gallon of water it is a weedkiller.

The design of gasoline and fuels are an interdisciplinary subject matter. Gasoline is a hydrocarbon, and thus an organic by definition. Chemical and Petroleum Engineering involve organic chemistry knowledge and applications.

No, different materials conduct heat at different rates. Materials with high thermal conductivity, like metals, transfer heat faster than materials with low thermal conductivity, like wood or plastic. Additionally, factors like density and mass can also affect how quickly heat moves through a substance.

Drinking from a straw is the same as an egg going into a glass bottle, because air pressure in both cases is used to move something.

In the straw, you reduce the air pressure in the straw, so the air pressure around the drink pushes it up into the straw and into your mouth.

In the egg, you reduce the air pressure in the bottle, and air pressure around the egg pushes it down into the bottle.

A microscope typically uses a convex lens to focus light and magnify an image. The convex lens converges light rays to produce a magnified image, whereas a concave lens would diverge light rays and not be suitable for magnification in a microscope.

The ability for a person to lean without falling depends on their balance, strength, and coordination. It is difficult to provide a specific distance as different individuals have varying levels of stability. Common materials that can help improve balance include yoga mats, balance boards, and stability balls.

The fact that acids are sour, that means the more sour a liquid is the more acidic it is. Because a lemon is more sour (acidic) than an orange, it produces more electricity. The more concentrated an acid is the more electricity it produces. NOTE: Please don't taste concentrated acids to test which will produce more energy, it can and will cause major death causing injuries. - [NAME REDACTED] [NEEDS CORRECTION] (Acidity in foods does NOT always correlate to voltage produced. See University of Illinois, Department of Physics. Google: {Q & A: Fruit Batteries | Department of Physics | University of Illinois} - Bryce Casaje

Computer models allow researchers to quickly test a wide range of scenarios without the need for expensive and time-consuming clinical trials. They can help predict potential outcomes, optimize treatment regimens, and identify potential side effects before moving to human trials. Additionally, computer models can be used to simulate the effects of different variables and conditions, providing valuable insights that can inform decision-making in the drug development process.

giving birth to a normal child can be done not to a full extent to retain or recourse the baby to a normal life but immediate blood transfusions can be given to the mother and the baby to save their lives. But still the baby would have minor dis orders like anaemia etc.

1. Lubrication: Applying a lubricant such as oil or grease between surfaces to reduce friction.
2. Smoothing: Ensuring that the surfaces in contact are flat and smooth to minimize friction.
3. Using ball bearings or rollers: Introducing rotating elements like ball bearings or rollers to reduce friction between moving parts.

Freezing is usually when something is turning cold, and solid.

Melting is usually when something is turning hot, and into a liquid. Sometimes, depending on chemicals, their can be exceptions to those.