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Chemical Basis Life
A&P Ch 3 PCP310
Term | Definition |
---|---|
Matter | Anything that has mass and occupies space |
Element | A substance that cannot be broken down into two or more different substances |
Carbon, Oxygen, Hydrogen and Nitrogen | Makes up 96% of elements in the human body |
Compound | Atoms of two or more elements joined to form a chemical combination |
Proton | Positively charged subatomic particles found in the nucleus |
Neutrons | Neutral subatomic particles found in the nucleus |
Electrons | Negatively charged subatomic particles found in the electron |
Atomic Number | Number of protons within the nucleus, also can be used to identify an element |
Mass Number | Weight of a single of atom, equal to number of protons and neutrons |
Bohr Model | Useful in visualizing the structure of atoms |
Energy Level | Space surrounding the nucleus where electrons are most likely to be |
Stable (inert) | When an atom has 8 electrons on the outermost energy level |
Reactive | An atom without a full outermost energy level |
Octet Rule | Atoms with fewer (or more) than eight elections in the outer energy level will attempt to gain, lose or share electrons with other atoms to achieve stability |
Chemical Reaction | Occurs between two or more atoms as a result of the activity between the electrons in their outmost energy level |
Molecule | two or more atoms covalently joined together |
Compound | Consists of groupings of atoms of two or more elements |
Ionic or Electrovalent Bond | Formed by the transfer of electrons between two atoms |
Covalent Bond | Formed by sharing electrons between two atoms |
Hydrogen Bond | The weakest bond between atoms that form from unequal distribution of electrons |
Synthesis Reaction | Formation of a new chemical |
Decomposition Reaction | Breaking of chemical bonds |
Metabolism | All the chemical reactions that occur in body cells |
Catabolism | Chemical reaction that breaks down complex structures that provides energy |
Anabolism | Chemical reaction that joins simple molecules to form complex molecules that uses energy |
ATP (adenosine triphosphate) | Transports energy as a by-product of catabolism also known as energy currency |
Inorganic Compounds | A substance that does not contain both a hydrogen and a carbon atom ie. Oxygen and Carbon dioxide |
Organic Compound | A substance that contains carbon atoms covalently bonded with other atoms, most commonly Hydrogen, Oxygen and Nitrogen ie. Lipids and Proteins |
Water | Most important and abundant compound in the body, helps regulate body temperature and transport essential materials around the body |
Polarity | The state or condition of an atom or a molecule inherent in a body that exhibits opposite properties or powers in opposite parts or directions ie. Water is known for this property |
Oxygen | Required to complete decomposition reactions necessary for the release of energy in the body |
Carbon Dioxide | Produced as a waste product and helps maintain the appropriate acid-base balance in the body |
Electrolytes | Substances that dissociate in solution to form ions ie. acids, bases and salts. Gatorade is filled with them! |
Cation | Positively Charged Ions |
Anions | Negatively Charged Ions |
Acids | Any substance that releases a hydrogen ion when in solution- proton donor |
Bases (alkaline) | Dissociates to yield hydroxide ions or other electrolytes that combine with hydrogen ions- proton accepter |
pH Scale | Assigns a value to measures of acidity and alkalinity, scale of 0 (acidic) to 14 (basic) |
Salts | Compound that results from chemical interaction between an acid and a base |
Neutralization reaction | Forms salt and water from a reaction between an acid and base |