chemistry definitions
quiz on chemistry definitions
Terms
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- Physical Change
- a change from one state (solid or liquid or gas) to another without a change in chemical composition
- Subatomic Particles
- protons, neutrons, or electrons
- Alkali Metals
- Group I of the periodic table consists of the alkali metals. They are the most electropositive elements known, are monovalent, have low melting points and react violently with water
- Compounds
- Compounds are formulas of lubricants, solvents, water and abrasive minerals in either a liquid or paste construction
- Neutrons
- A subatomic particle with no net charge. Neutrons are found in the nucleus of an atom
- Protons
- The part of the atom's mass that has a positive charge
- Electrons
- These have a negative charge and orbit the nucleus
- Molecules
- the smallest portions of a substance having the properties of the substance
- WHIMIS
- Workplace Hazardous Materials Information System (WHMIS)
- Pure Substance
- Homogeneous matter with a definite, or fixed, composition
- Isotope
- one of two or more atoms with the same atomic number but with different numbers of neutrons
- Atomic Number
- the order of an element in Mendeleyev's table of the elements
- Atomic Radius
- distance from the nucleus to the outermost energy level.
- Beta Rays
- Charged particles (electrons) emitted from the nucleus of an atom that are smaller and faster than alpha rays and can penetrate several layers of tissue up to a few millimeters, or a few meters of air.
- Chemical Change
- any change in a substance that involves the rearrangement of the way the atoms are bonded
- Radioactive
- The spontaneous emission of particles by an unstable atom
- Chemical Formula
- The number and kind of atoms that make up a molecule of material.
- Atomic Mass
- Approximately the sum of the number of protons and neutrons found in the nucleus of an atom
- Spectrum
- The complete range of colors in the rainbow, from short wavelengths (blue) to long wavelengths (red).
- Protons
- The positively charged particles in the nuclei of atoms
- Electrolysis
- removing superfluous or unwanted hair by passing an electric current through the hair root
- Alloys
- mixtures of two or more metals
- Minerals
- Inorganic elements that are essential constituents of all cells
- Viscosity
- The "thickness" of a liquid or its ability to flow. Most liquids decrease in viscosity and flow more easily as they get warmer
- Malleability
- Ability of a substance to be molded into different shapes