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2-Chemistry Of Life
Old stuff
| Question | Answer |
|---|---|
| What is the basic unit of matter | Atom |
| If an atomic nucleus were the size of a marble, the entire atom would be the size of an atom. True of False? | True |
| Most of the mass of an atom is in it's- | Nucleus |
| Most of the size (volume) of an atom is filled by it's- | Electrons |
| The nucleus is made up of ______ with a positive charge. And ________ with no charge. | PROTONS with a positive charge. And NUETRONS with no charge. |
| ________are negatively charged particles that surround the nucleus like a cloud. | Electrons |
| ________are pure substances, that consist entirely of one type of atom. | Elements |
| ______are represented by one or two letter symbols. | Elements |
| Iso=_______ and Tope=_______. | Iso= same and Tope= place |
| So_______share the same place on the periodic table. | Isotopes |
| Atoms of the same element that differ in their number of neutrons. | Isotopes |
| Because isotopes have the same number of electrons, they share the same_______. | chemical properties |
| Unstable isotopes are called____________. | Radio active isotopes |
| Radio active isotopes are unstable which means that they___________or change into other__________at a___________over time. | Radio active isotopes are unstable which means that they BREAK DOWN or change into other ISOTOPES at a PREDICTABLE over time. |
| Radio active isotopes are used to ____________________. | Determine the ages of rocks and fossils. |
| A substance formed by the chemical combination of two or more elements in definite proportions. | Compound |
| Scientist use ________to indicate the __________of compounds. | Chemical formulas, and Chemical composistions |
| Coumpounds are often__________Than any of the elements that make it up. | Different chemicaly |
| The______and________of the bonds that hold different compounds together are_________and_______. | Types and Strengths, are Varied and Complex |
| The bonds largely determine the_____________. | Nature of chemical compounds. |
| Bond formation involves electrons that are___________. | Available to form bonds. |
| The electrons that are available for bond formation. | Valence electrons |
| Main types of chemical bonds are______and______. | Ionic, and Covalent |
| Ionic bonds are formed when- | One or more electrons are transferred. |
| That atom that has extra electrons is now- | Negatively charged |
| The atom that has fewer electrons is now- | Positevely charged |
| The_____and_______charged atoms are attracted to one another like tiny magnets. | Negatively and Positively |
| Are formed when pairs of electrons are shared. | Covalent bonds |
| Molecules form when- | Atoms are joined together by covalent bonds. |
| Small charges that attract oppositely charged parts of nearby molecules. | Van der Waals forces |
| A large number of these________________can add up to an____________. | Relatively weak bonds, and Important effect |
Created by:
Samuelsnider
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