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Biology H Sem 1
REVIEW of 6.1 and 6.2
| Question | Answer |
|---|---|
| What is the study of matter? | Chemistry |
| What are the building blocks of matter? | Atoms |
| Where are neutrons and protons located? | The center of an atom |
| How are protons charged? | Positively charged |
| Where are electrons located? | The Outside of the nucleus |
| T or F: The number of electrons in an atom is equal to the number of neutrons in an atom. | False. (# of electrons is usually equal to # of protons) |
| The first shell of electrons must contain how many electrons for the atom to be stable? | 2 electrons |
| How many electrons must the 2nd shell of electrons contain for the atom to be stable? | 8 electrons |
| What is a pure substance that cannot be broken down into other substances by physical or chemical means? | an Element |
| How many known elements are there? | 100 |
| How many of the known elements are synthetic? | 8 |
| The horizontal rows on the periodic table are called what? | Periods |
| The vertical columns of the periodic table are also known as what? | Groups |
| What are atoms of the same element with the same number of protons and electrons, but a different number of neutrons? | Isotypes |
| What is a pure substance formed when two or more different elements combine? | Compound |
| T or F Compounds are always formed from a specific combination of elements in a fixed ratio. | T |
| T or F Compounds cannot be broken down by physical means. | T |
| T or F A covalent bond forms when protons are shared. | F. A covalent bond (the strongest chemical bond) is formed when electrons are shared. |
| T or F Ionic bonds are weaker than covalent bonds, and are formed when two oppositely charged atoms are electrically attracted, | T |
| T or F Metals tend to accept electrons more (for ionic bonds) than non-metals do. | F |
| What are Van der Waals Forces | When molecules come close together, the attractive force between sightly positive and negative regions pull on the molecules and hold them together. |
| What is a process by which atoms or groups of atoms in substances are reorganized into different substances? | Chemical reaction |
| Name 2 signs that a chemical reaction has occured. | 1. Production of light/heat. 2. Formation of solid/liquid/gas. |
| What states that matter cannot be created or destroyed? | The law of conservation of mass |
| What is the minimum amount of energy needed for reactants to form products in a chemical reaction? | Activation Energy |
| T or F An exothermic reaction absorbs heat energy. | F; an exothermic reaction releases heat energy. (An endothermic reaction absorbs heat energy) |
| What is the purpose of a catalyst? | To lower the activation energy needed to start a chemical reaction. |
| What is an enzyme? | A biological catalyst. |
| The reactants that bind to the enzymes are called what? | Substrates |
Created by:
12cfonner
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