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Chemsitry Essential
Chemistry Essential Vocabulary
Question | Answer |
---|---|
Conductivity | Property of metal and alloys that allow heat or electricity charges to pass through the material easily. |
Elements | A substance that cannot be broken down into simpler substances by ordinary chemical means. |
Metals | An element below and to the left of the stair-step line of metalloids; about 80% of the known elements are metals. |
Model | A standard or example used for comparison. |
Atom | The smallest unit of matter that retain the identity of the substance. |
Compounds | a pure substance that is made up of more than one type of atom |
Crystal Pattern | A solid in which all the atoms are arranged in a regular, repeating pattern. |
Evaporation | Process in which liquid water changes to water vapor. |
Filtering | A porous material through which a substance is passed in order to separate the fluid from suspended particulate matter. |
Heterogeneous | A mixture that is not mixed evenly and each component retains its own properties |
Homogenous | Solid, liquid or gas that contains two or more substances blended evenly throughout. |
Matter | anything that has mass and volume |
Mixtures | The physical combination of 2 or more substances; can be separated by physical means. |
Molecule | the smallest physical unit of a substance that can exist independently, consisting of one or more atoms held together by chemical forces |
Sifting | To separate and retain the coarse parts to remove lumps and large particles |
Conductivity | Property of metal and alloys that allow heat or electricity charges to pass through the material easily. |
Elements | A substance that cannot be broken down into simpler substances by ordinary chemical means. |
Periodic Table | An arrangement of elements in order of increasing atomic numbers that demonstrates the periodic patterns that occur among the elements. |
Physical Properties | A characteristic of a substance that can be observed without changing the identity of the substance |
Reactivity | The ability of an atom or molecule to undergo a chemical reaction with another atom, molecule or compound. |
Reactants | the starting materials in a reaction |
Chemical bond | the "glue" that attracts and keeps atoms held together due to sharing of each atom's electrons |
Chemical change | the process in which one or more substances are changed into one or more new substances |
Chemical property | property that can be observed only when a substance is changed into a new substance |
Chemical reaction | the process in which one or more substances are changed into one or more new substances |
Matter | anything that has mass and volume |
Phase | any of the forms or states (solid, liquid, gas, or plasma) in which matter can exist |
Physical Change | change that does not alter the identity of a substance |
Precipitate | the solid that is formed as a result of a precipitation reaction |
Closed System | the reactants and products in the reaction that are contained to reduce error |
Law of Conservation of Mass | states that the total amount of mass and energy in the universe is conserved (does not change) |
Mass | a measure of the amount of matter in an object |
Products | materials present at the end of a reaction |
Reactants | the starting materials in a reaction |
Periods | The horizontal rows on the periodic table. Atomic Mass increases from left to right and top to bottom of the table. |
Groups or Family | Elements in the same column have similar properties. The elements in the group on the far left of the chart are the Alkali metals and are the most reactive elements.The vertical columns on the periodic table. |
proton | positive particals in the nucleus |