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25 terms

Science Unit 4

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Chemical Reaction
the process in which atoms are rearranged to produce new substances.
chemical formula
uses chemical symbols and numbers to represent a given substance.
Reactants
are the substances that participate in a chemical reaction.
Products
are the substances formed in a reaction.
law of conservation of mass
states that matter is neither created nor destroyed in ordinary physical and chemical changes.
coefficient
a number placed in front of a chemical formula.
subscript
The numbers written below and to the right of chemical symbols
endothermic reaction
A chemical reaction that requires an input of energy is called
exothermic reaction
A chemical reaction in which energy is released to the surroundings
law of conservation of energy
states that energy cannot be created or destroyed.
Chemical Equation
is an expression that uses symbols to show the relationship between the starting substances and substances that are produced by a chemical reaction.
Balancing the Equation
When writing a chemical equation, you must be sure that the reactants and products contain the same number of atoms of each element.
Organic Compound
is a chemical compound that is composed of carbon, hydrogen, and possibly other elements.
Hydrocarbon
is an organic compound that contains only carbon and hydrogen atoms.
Organic Acid
is an organic compound that has acid properties.
Carbohydrate
is a neutral organic compound containing carbon, hydrogen, and Oxygen.
Polymers
are molecules composed of the same repeating small groups of atoms joined together in long chains.
Nuclear Reaction
is a change that affect the nucleus of an atom.
Isotope
Atoms with the same number of protons but different numbers of neutrons.
Radioactive Decay
is a nuclear reaction is which an unstable nucleus can give off energy and, sometimes, particles.
Alpha Decay
is the release of alpha particles ad energy from radioactive nucleus.
Beta Decay
A beta particle and energy are released.
Gamma Rays
are released during gamma decay. They are high-energy radiation and have no mass and no change.
Nuclear Fission
The nuclear reaction in which a large, unstable nucleus breaks into two smaller nuclei.
Nuclear Fusion
is the process by which nuclei of small atoms combine to form a new, massive nucleus.