Chem flash card
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28 Terms
Compounds
Two or more different elements that are chemically combined in a fixed ratio.
Compounds can only be seperated through a chemical reaction.
Exothermic
A chemical reaction that releases energy
Endothermic
A chemical reaction that absorbs energy from its surroundings.
Physical preperites
Properties that can be observed without changing the substance's chemical identity.
Color,luster (Shiny) and density
Molecules
Atoms bonded together
Matter
Anything that takes up space
Protons
A positively charged subatomic particle found in the nucleus of an atom.
Neutron
A neutral subatomic particle located in the nucleus of an atom.
Atomic Number
The number of protons in the nucleus of an atom, which determines the element's identity.
Atomic Mass
The weighted average mass of an element's isotopes, measured in atomic mass units (amu).
Isotopes
Variants of a chemical element that have the same number of protons but different numbers of neutrons.
State of Matter
Can be changed by temperature and pressure
Solution
A mixture in which one substance is dissolved or broken down into another.
Solubility
The number of grams of one substance that will dissolve in 100g of another substance at a given temperature and pressure.
Reactant
Substance that enters into chemical reaction
Product
substance produced
To speed up a chemical reaction you do what…
Increase surface area, increase temperature, increase the concentrate
Exothermic
A chemical reaction that releases energy
Endothermic
A chemical reaction that absorbs energy from its surroundings.
A chemical reaction has occurred if…..
A solid precipitate forms at the bottom of the test tube, heat or light is produced, gas is produced, color change occurs.
mass number
the number of protons and neutrons in an atom's nucleus.
ion
An electrically charged atom
plasma
-lighting is made out of plasma
the most common state of matter in the universe
element
a pure substance that consists of only one type of atom and cannot be broken down into simpler substances by chemical means.
metalloid
a type of element that has properties of both metals and nonmetals, typically found along the dividing line between metals and nonmetals on the periodic table.
To test for a metal you..
Do the burn test
Hydrogen
makes a pop
Oxygen
Relights the splint