Temperature and heat

Kinetic Energy: the energy of a moving object.

Potential energy: energy stoewd in a moving object or material.

Temperature: the avergae kinetic energy of the molecules in a material.

Heat: energy that flows between objects that have different temperature.

 

Radiation: the transfer of energy by electromagnetic waves.

Conduction:  the transfer of energy by direct contact of molecules.

Convection: the transfer by the flow of  a liquid or gas.

Insulation: prevents heat from flowing in or out of a material.+

Chemical Change

Compund: a chemical combination of two or more elements

Chemical Bond: a link that atoms or electrically charged particles can form with each other.

Chemical Formula: a way of using letters and numbers to show how much of each element is in a substance.

Ion: an electrically charged particle with unequal numbers of protons and electrons.

Molecule: a group of bonded atoms that acts like single particle.

Chemical Property: a way of describing how a substances change chemically with other substances.

Exothermic:  a reaction that gives-off heat.

Endothermic: a reaction that absorbs heat.

ELEMENTS AND ATOMS

1. Element: a substance that can´t be broken down any further into anything simpler.

2. Atom: the smallest particle of an element that has the same chemical properties as the element.

3. Nucleus: an atom´s dense center, where most of its mass is.

4. Electron: a negatively charged particle that moves around an atom´s nucleus.

5. Proton: a positively charged particle inside an atom´s nucleus.

6. Neutron: a particle with no charge inside an atom´s nucleus

7. Atomic Number: the number of protons in an atom.

8. Metal: any of the group of elements that conduct heat and electricity, is shiny and bendable.

PHYSICAL PROPERTIES

1. Matter: any solid, liquid, or gas.

2. Mass: the amount of matter in an object.

3. Volume: the amount of space an object takes up.

4. Density: the amount of mass in a certain volume of material.

5. Physical Property: a property that can be observed without changing the identity of a substance.





6. Physical Change: a change in size, shape, or state without forming a new substance.

7. Solution: a mixture of one substance dissolved in another so that the properties are the same throughout.

8. Chemical Change: A change in matter that produces a new substances with different properties from the original.

NEW YEAR 2011

A NEW YEAR FOR BLOGGER AND NEW OPPORTUNITIES OF LEARN SCIENCE. I HOPE THIS YEAR MY BLOG WOULD BE BETTER THAN LAST YEAR.

Summary #8 "Blood System" in other words the "Circulatory System"

The function of the circulatory system is to transport nutrients and oxygen to all the humans´ body. The blood have three types of cells and its function :

• Red Blood Cells: transport nutrients and oxygen.



•  White Blood Cells: Fight diseases( infections )

• Platelets:  Stop bleeding and cover injuries from bleed.
  
  

The most important organ on the Circulatory System  is the heart; is the only organ that pumps blood to all our body. There are three types of blood vessels in our body here is with each function are:

1. Arteries: Carry blood from the heart to the body.
2. Capillaries: Connect veins and arteries.
3. Veins: Bring the blood back to the heart.

The circulatory system isn´t only the heart and the three blood vessels; it is the lungs, the small intestine and the kidneys.

Summary #7 "How Ecosystems Change"

What happens when people abandon a city? Natures takes over; one example is the cities and the temples of Angkor in Camboidia (they were built between 820 and about 1150. Lest me explain you; the gradual replacement of one monnunityby another is called Ecological Succesion. The ecological succesion takes places in five steps:

1. Abandoned Farm---First Year: A comunity of crabgrass, insects, and mice invades the fields where corn or another crop once grew.
2. Second and Third Years: Tall weeds, such as asters, ragweed, and goldenrod, and tall grasses grow among the crabgrass. The crabgrass can´t easily survive in the shade cast by the taller weeds. It begins to die out. Rabbits and seed-eating birds move in.
3. Four to six Years: The comunity is growing it have stunks, birds and others mammals like the mouse.
4. Twenty five years later: Pines agrew up there are much kinds of mammals like the fox, racoons,birds etc.
5. One hundred years later: know the forest is an decidious forest with deers,more trees etc.