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Matter and Energy are Related
from BSCS A Human Approach
33
Science
10th Grade
01/20/2009

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Term
atoms
Definition
the basic building block of all matter.
Term
chemical bonds
Definition
holds atoms together to make molecules. Energy is stored within the bonds. There are different types of bonds.
Term
molecules
Definition
atoms that are held together and organized in unique ways.
Term
exothermic reactions
Definition
chemical reactions that release heat when molecules are reorganized. Surroundings heat.
Term
endothermic reactions
Definition
chemical reactions that need heat energy from surroundings to reorganize molecules. Surroundings cool.
Term
potential energy
Definition
inactive form of energy, example is gasoline
Term
kinetic energy
Definition
active energy, energy that is being used, example is gas burning in a car's engine or a rock rolling down hill.
Term
conservation of energy
Definition
Energy is never destroyed or created, energy transforms from one form to another.
Term
chloroplasts
Definition
Organelle, in a plant or photosynthetic organism, where photosynthesis takes place
Term
photosynthesis
Definition
Process where plants 1)capture light energy and convert to chemical energy, and 2)take carbon dioxide from the air to build carbohydrates.
Term
electron
Definition
the negatively charged particle of atom
Term
electron transport system
Definition
last step in cellular respiration is the transfer of electrons to make the bulk of ATP. This happens in the cell's mitochondria in the membrane that separates the inner and outer compartments.
Term
chlorophyll
Definition
Captures the sun's light energy to convert it to chemical energy. The pigment that gives plants the green color.
Term
carbon fixation
Definition
The process in photosynthesis where carbon dioxide is broken into carbons to build carbohydrates in plants.
Term
ion
Definition
an atom that has lost or gained an electron
Term
ionic bonds
Definition
bonding between atoms that have lost or gained electrons, weaker than covalent bonds. Example is the bonds holding sodium and chloride together in salt:NaCl
Term
covalent bonds
Definition
bonding between atoms that share electrons, stronger than ionic bonds. Example is the bonds holding together the 2 hydrogen atoms to 1 oxygen atom in water.
Term
enzyme (definition #2)
Definition
large molecules that help the right chemical reactions take place in cells at the right time
Term
ATP
Definition
molecule that stores energy in a form that cells can use. ATP stands for "adenosine triphosphate"
Term
cellular respiration
Definition
the process where enzymes convert the energy stored in molecules into ATP.
Term
glycolysis
Definition
1st stage of cellular respiration cycle. Breaks glucose into 2 smaller molecules called pyruvate. Produces ATP and NADH, but uses 2 ATP.
Term
Krebs cycle
Definition
2nd stage of cellular respiration. Breaks pyruvate into NADH, ATP and carbon dioxide.
Term
NADH
Definition
A energy carrier molecule.
Term
mitochondria
Definition
Organelle in the cell where cellular Krebs cycle and electron transfer takes place.
Term
aerobic respiration
Definition
Respiration that requires oxygen.
Term
anaerobic respiration
Definition
Respiration that takes place in cells where there is not oxygen.
Term
thylakoids
Definition
Structures in chloroplasts that contain chlorophyll.
Term
stroma
Definition
Liquid surrounding the thylakoids in the chloroplasts.
Term
glycogen
Definition
Carbohydrate that stores energy in animals
Term
metabolism
Definition
All the chemical activities in a cell or organism.
Term
entropy
Definition
the measure of the disorder of a system. Example: salt molecules dissolved into water.
Term
heterotrophs
Definition
organisms that depend on other sources for carbon and energy.
Term
autotrophs
Definition
organisms, like plants, that make macromolecules for energy storage and structure, usually though the process of photosynthesis.
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