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Chemistry 8 EOG Rvw
Chemistry
Term | Definition |
---|---|
Acid | pH of less than 7. |
Base | pH of more than 7. |
pH | scale used to classify solutions. |
Catalyst | substance that increases the rate of a chemical reaction. |
Chemical change | result in the formation of one or more new substances with new chemical and physical properties |
Chemical properties | be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition. |
Compound | pure substances that are composed of two or more types of elements that are chemically combined. |
Electrons | a negatively charged subatomic particle found outside of the nucleus of the atom. |
Law of conservation of mass | The amount of matter does not change during a chemical reaction, only that the atoms are rearranged to form new substances. This is evidenced in a balanced chemical equation. |
Metal | elements with similar properties found on the left side of the “staircase” on the periodic table. |
Metalloid | elements with similar properties that create a “staircase” on the periodic table. |
Mixture | physical combinations of two or more different substances that retain their own individual properties and are combined physically (mixed together). |
Heterogeneous Mixture | is not uniform throughout, the component substances can be visibly distinguished. |
Homogenous Mixture | is uniform throughout, the substances are evenly mixed and cannot be visibly distinguished |
Neutrons | a subatomic particle with no charge (neutral) found in the nucleus of the atom. |
Nonmetal | elements with similar properties found on the right side of the “staircase” on the periodic table |
Periodic table | a quick reference for associating the name and symbol of an element. |
Physical change | do not change the composition of a substance, only the physical properties |
Physical properties | can be observed and measured without changing the kind of matter being studied. |
Precipitate | a solid substance formed when two solutions are chemically combined. |
Products | new substances formed in a chemical reaction and that they are located on the right side of the arrow in a chemical equation. |
Protons | a positive subatomic particle found in the nucleus of an atom. |
Reactants | substances broken apart or combined in a chemical reaction and that they are located on the left side of the arrow in a chemical equation. |