8 Unit 2 Physical Science Vocabulary

Tri

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Law of Conservation of Mass

• Matter can be created and destroyed.

• Matter can only be created.

• Matter cannot be created or destroyed, it can only be transferred or transformed.

• Matter can be transformed but not transferred.

Unstable Isotope

• A stable isotope that does not decay.

• A radioactive isotope that does decay.

• An isotope that is always found in nature.

• An isotope that can be used as a fuel source.

Neutral

• An atom or molecule with an equal number of protons and electrons, net charge of 0.

• An atom with more protons than electrons, resulting in a positive charge.

• A molecule that has lost one or more electrons, resulting in a negative charge.

• An atom that has gained additional neutrons, affecting its mass but not its charge.

Hepta

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Deca

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Reactant

• A substance that takes part in and undergoes change during a reaction.

• A product formed after a chemical reaction.

• A catalyst that speeds up a reaction without being consumed.

• A byproduct that does not affect the reaction.

Nona

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Balanced Equation

• A chemical equation that has the same number and type of atoms on both sides of the reaction arrow, supports the law of conservation of mass.

• A chemical equation that shows the reactants and products without any coefficients.

• A chemical equation that only includes solid reactants and products.

• A chemical equation that is not yet simplified.

Cation

• A negatively charged ion that forms when an atom has more electrons than protons.

• A positively charged ion that forms when an atom has more protons than electrons.

• An atom that has an equal number of protons and electrons.

• A neutral atom with no charge.