click below
click below
Normal Size Small Size show me how
CHM1045 Final Exam
A review from the study sheet I got from my CHM1045 class.
Question | Answer |
---|---|
Element | cannot be seperated into simpler substances. |
Compound | two or more elements united chemically in definite proportions. |
Mixture | two or more substances in which the substances retain their chemical identities. |
Physical Change | Doesn't change chemical composition. |
Chemical Change | One or more substances are converted into other substances. |
Plasma | Similar to gas. Certain portion of the particles are ionized. (adapted from wikipedia) |
Pure Substance | matter with a fixed composition and distinct properties. |
Mixture | Combination of two or more substances in which each substance retains its own chemical identity. |
Law of the Conservation of Matter | total mass of the products of a chemical reaction = total mass of the reactants. Mass remains constant. |
Scientific Method | Ask a question - Research - Hypothesis - Test it - Analyze data and draw a conclusion - Report results |
Mass Number | he total number of protons and neutrons (together known as nucleons) in an atomic nucleus. |
Avogadro's Number | The number of ^12C atoms in exactly 12 g of ^12C; it equals 6.022 x 10^23. |
Law of Definite and Multiple Proportions | A law that states that the elemental composition of a pure substance is always the same, regardless of its source. |
Types of Chemical Bonds | Ionic: refers to electrostatic forces that exist between ions of opposite charge. Covalent bond: results from the sharing of electrons between two atoms. Metallic bonds: found in metals. |
Oxidation | a process in which a substance loses one or more electrons. |
Reduction | a process in which a substance gains one or more electrons. |