lunes, 11 de abril de 2011

Vocabulary # 4 Temperature and Heat

1. Kinetic energy: The energy of a moving object




2. Potential energy: Energy stored in an object or material


3. Temperature: The average kinetic energy of the molecules in a material


4. Heat: Energy that flows between objects that have different temperatures


5. Radiation: The transfer of energy by electromagnetic waves


6. Conduction: The transfer of energy by direct contact of molecules


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


8. Insulation: Prevents heat from flowing in or out of a material

Vocabulary # 3 Chemical Changes

1. Compound: A chemical combination of two or more elements




2. Chemical bond: A link that atoms or electrically charged particles can form with each other


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


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


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


6. Chemical property: A way of describing how a substance changes chemically with other substances.


7. Exothermic: A reaction that gives off heat


8. Endothermic: A reaction that absorbs heat


Vocabulary # 2 Elements and Atoms

1. Element: A substance that cannot 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 atoms´s dense center, where most of it mass is.


4. Electron: A negatively charged particle that moves around an atoms nucleus.


5. Proton: a positively charged particle inside an atoms nucleus.


6. Neutron: a particle with no charge inside an atoms nucleus.


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


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

domingo, 20 de marzo de 2011

Vocabulary #1 Physical Properties

1.     Matter:  Any solid, liquid  or gas
2.     Mass: 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 the produces a new substance with different properties from the original