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Science Unit 4
the process in which atoms are rearranged to produce new substances.
uses chemical symbols and numbers to represent a given substance.
are the substances that participate in a chemical reaction.
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.
a number placed in front of a chemical formula.
The numbers written below and to the right of chemical symbols
A chemical reaction that requires an input of energy is called
A chemical reaction in which energy is released to the surroundings
law of conservation of energy
states that energy cannot be created or destroyed.
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.
is a chemical compound that is composed of carbon, hydrogen, and possibly other elements.
is an organic compound that contains only carbon and hydrogen atoms.
is an organic compound that has acid properties.
is a neutral organic compound containing carbon, hydrogen, and Oxygen.
are molecules composed of the same repeating small groups of atoms joined together in long chains.
is a change that affect the nucleus of an atom.
Atoms with the same number of protons but different numbers of neutrons.
is a nuclear reaction is which an unstable nucleus can give off energy and, sometimes, particles.
is the release of alpha particles ad energy from radioactive nucleus.
A beta particle and energy are released.
are released during gamma decay. They are high-energy radiation and have no mass and no change.
The nuclear reaction in which a large, unstable nucleus breaks into two smaller nuclei.
is the process by which nuclei of small atoms combine to form a new, massive nucleus.