Chemistry terms.
Chemistry A.
Terms
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- intensive
- do not depend on the matter
- periods
- horizontal rows, properties change consistently across a period, numbered 1-7
- filtration
- solid part is trapped by filter paper and the liquid part runs through the paper
- heterogeneous
- not in uniform composition; visible parts. (i.e. soil, blood, concrete)
- compound
- substance made of 2 or more types of atoms that are chemically bonded
- products
- substances that form
- endothermic reaction
- reaction that uses up energy (feels cold)
- reactant
- substances that react
- physical
- characteristics that can be observed or measured without changing the identity of a substance
- homogeneous
- also called solution uniform in composition, no visible parts (i.e. vinegar, clear air, salt water)
- chemistry
- study of matter and the changes it undergoes
- atom
- smallest unit of an element that keeps the properties of element
- nonmetals
- an element that is a poor conductor of heat and electricity
- groups
- also called families, vertical columns, numbered 1-18, have similar chemical properties
- element
- pure substance made of only one type of atom
- matter
- anything that has mass and volume
- metals
- an element that is a good conductor of electricity
- centrifuge
- machine that spins a sample very quickly so that components with different densities will separate
- chemical
- relates to a substances ability to undergo changes that transform it into a different substance
- volume
- the amount of space occupied by an object
- chemical
- any substance with definite composition
- extensive
- depend on the amount of matter
- mass
- a measure of the amount of matter
- decanting
- when liquid is poured off after solid has settled to bottom
- chromatography
- used to separate mixtures because different parts move quicker on paper than other
- vaporization
- where the liquid portion is evaporated off to leave solid
- metalloids
- an element that has some characteristics of metals and nonmetals
- molecule
- type of compound in which bonds are covalent bonds
- noble gases
- generally nonreactive gases
- exothermic reaction
- reaction that gives off energy (feels warm on the outside)