https://padlet.com/149553/8vibbyhy1slf en-us 2016-11-07 00:57:59 UTC 2016-11-08 03:01:50 UTC hello@padlet.com 149553 https://padlet.com/149553/8vibbyhy1slf/wish/135980244 --Many materials can be broken down into different components
--Some materials cannot be separated or broken down into other materials
--An element is a pure substance that cant be separated into simpler substances 
--A pure substance is a material where all of the basic particles are the same.
--Particles of a pure substance are alike
--The basic particles of elements are called atoms.
--Elements are arranged based on their properties
--Two types of properties are chemical, and physical
--Physical properties include hardness,melting, and density
--Chemical properties include reactivity, and flammability.
--Three main categories of elements are metals, nonmetals, and metalloids
--Metalloids have a couple of properties of metals and some of nonmetals

]]> 2016-11-08 01:58:49 UTC https://padlet.com/149553/8vibbyhy1slf/wish/135980244 149553 https://padlet.com/149553/8vibbyhy1slf/wish/135981707 --Compound is a pure substance composed of two or more elements in that are chemically combined
--A chemical change happens when one substance is changed into one other substance
--In some chemical reactions two elements join to form a compound
--Each compound has characteristic properties 
--Chemical properties can be used to identify compounds
--The properties of a compound differ
--Sodium chloride is made of two very reactive and toxic elements
--Sodium is a metal that reacts violent with water and causes damage to skin when in contact
--Chlorine is a poisonous gas
--Sodium or table salt is safe to consume 
--The properties of a compound depends on which elements combine
--Some compounds can be broken down into their elements by adding heat or electricity 
-Carbon monoxide is a poisonous gas and plants use carbon dioxide to make oxygen


]]> 2016-11-08 02:13:30 UTC https://padlet.com/149553/8vibbyhy1slf/wish/135981707 149553 https://padlet.com/149553/8vibbyhy1slf/wish/135984098 --A mixture is a combination of two or more substances that are not chemically combined
--Chemicals can form mixtures
--A chemical change does not happen when a mixture is made
--Often you can see the components of the mixture
--Other mixtures cannot be separated easily 
--A compound is made of elements that are always present in a fixed ratio
--A mixture does not have a fixed ratio of components
--A solution is a homogeneous mixture
--In a solution the component that is present in the largest amount is called the solvent
--Substances present in smaller amounts are called solutes
--Water is a very usual solvent
--Solubility refers to the ability of a solute to dissolve in a solvent at certain temperature
--A measure of the amount of solute in a given amount of solvent is concentration
--Solutions are usually described as being concentrated or dilute
--A concentrated solution has more solute in solution

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