Compound: 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 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 a single particle.
Chemical propety: a way of describing how a substance changes chemically with other substances.
Exothermic: a reaction that give off heat.
Endothermic: a reaction that absorbs heat.
Vocabulary
jueves, 28 de abril de 2011
Elements and Atoms
Element: a substance that cannot be broken down any further into anything simpler.
Atom: the smallest particle of an element that has the same chemical properties as the element.
nucleus: an atoms dense center, where most of its mass is.
Electron: a negatively charged particle that moves around an atoms nucleus.
Proton: a positively charged particle inside an atoms nucleus.
Neutron: a particle with no charge inside an atoms nucleus.
Atomic number: the number of protons in an atom.
Metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.
Atom: the smallest particle of an element that has the same chemical properties as the element.
nucleus: an atoms dense center, where most of its mass is.
Electron: a negatively charged particle that moves around an atoms nucleus.
Proton: a positively charged particle inside an atoms nucleus.
Neutron: a particle with no charge inside an atoms nucleus.
Atomic number: the number of protons in an atom.
Metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.
miércoles, 27 de abril de 2011
Physical Properties
1. Matter: any solid, liquid, or gas.
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 observerd without changing the identity of a substance.
6. Physical Change: a charge 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 substance with different properties from the original.
2. Mass: Amount of matter in an object
4. Density: The amount of mass in a certain volume of material.
5. Physical Property: A property that can be observerd without changing the identity of a substance.
6. Physical Change: a charge 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 substance with different properties from the original.
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