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Classification of Mater

Added Sep 27, 2016 •

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introduction to chemistry Lesson 1.1 matter chemistry is the study of matter  matter is anything that has mass and takes up space let's look more closely at what is matter is this matter the sun does the Sun have mass does it take up space yes so it's matter Marcos  marbles have mass and take up space so they also are matter it does not have mass and does not take a face so it is not matter  ice Hazmat and takes up space and cold which is the absence of heat does not have math and does not make a face so it is not matter  types of matter will first talk about troops Essences and then Quantum example of a pure substance is identical to every other sample  example water every sample of water is identical the other sample  the same's true of oxygen  the same is true of cold  an element is a trip to made of only one type of atom call is only made of one type of atom will the atom  call count on the other hand is a prusa composer two or more elements chemically combined 4 cup of water is a compound made up of hydrogen oxygen atoms combined in a 2 to 1 ratio I also consider oxygen gas a compound made of only one type of atom oxygen atoms chemically combined because they are chemically combined I consider them more oxygen gas to be more of a compounds or some people will call this as well an element  in summary weave pure substances a pure substance is a substance with every samples identical to every other sample of pure substance can either be an element or compound and element is a pure substance composed of the same atoms with a compound is composed of two or more elements chemically combined a mixture is a type of matter composed of two or more substances physically combined not chemically combined for example of bowl of Raisin Bran what consists of bran raisins and milk is a physical mixture  there is also a mixture it consists mostly of nitrogen gas and some syngas and various other gases a homogeneous or homogeneous mixture which is also referred to as a solution is the same route it is uniform and appearance and composition for sample a picture of Kool-Aid is the same throughout air is a modulus mixture heterogeneous mixture on the other hand is a mixture that is not the same throughout for example a bowl of Raisin Bran cereal you got your milk your brand your raisins clearly is not the same throughout in summary mixtures are two or more substances that are physically combined not chemically combined a modest mixtures the same throughout where is a heterogeneous mixture how much is fixtures are also referred to as Solutions separation of mixtures mixtures are physically combined they can be separated by physical methods which iMessage face physical properties  one such method is filtration filtration is the separation of a mixture based on particle size the part of the mixture whose particles are larger than the pores of the filter paper are we changing the paper while the part of the mixture whose particles are in the pores the filter paper flows through to the container below clearly it is difficult to separate a mixture of teach from quit using filtration through a paper filter  a mixture of liquids can be separated using a process called a distillate as long as the liquids have different boiling points  the liquid mistress heated and the liquid with the lower boiling point evaporates escapers travels to a condenser which cools The Vapor back to a liquid by surrounding it with cold water  resulting that's liquid is collected in a flask on the other end the higher boiling point liquid is retained in the original flask matter can be classified as either pure substance or mixture of substances a pure substance can be either an element which consists of only one type of atom or a compound which consists of more than one type of atom chemically combined  a mixture of substances consists of more than one substance physically not chemically combined this mixture is the same throughout like a picture of Kool-Aid homogeneous mixtures are referred to as Solutions  is heterogeneous mixture is not the same throughout like a bag of Trail Mix  matter has both chemical properties and physical properties chemical properties are characteristics which could be seen as one substance is chemically transformed into another for example a chemical reactivity with another chemical iron Tennessee progressed to become iron 3 oxide and flammability a substances reaction with oxygen these are all chemical properties which can only be seen as a substances chemically transformed into another physical properties on the other hand are properties that can be observed without changing the identity of the substance for example smell color solubility boiling point volatility these are all physical properties that you can observe without changing the identity of the substance  let's practice tickle chain between chemical and physical changes  the boiling point of water at 100 degrees Celsius is that a chemical change physical change since it doesn't describe Waters reactivity with another substance or is not observed as water becomes another substance is change  iron rust in air iron forming iron 3 oxide is chemical reaction it describes irons ability to react with another substance so it's a chemical property Rick acid 1.0 molar acetic acid has a pH of 2.4 pH is a measure of the concentration of hydrogen ion in solution the concentration of hydrogen ion in a solution describes a substances ability to react with other substances specifically faces there a speech describes an acid ability to donate hydrogen ions to another substance it is a chemical property ice is less dense than water this can be observed without changing eyes into another substance so it is a physical change the three common states of matter with which you are probably familiar solids liquids and gases a solid has a definite volume and definite shape  a liquid has a definite volume but does not have a definite shape liquids take the shape of their container  a gas does not have a definite volume nor a definite shape gases take the shape volume of their container chemical versus physical changes a chemical change is a change in chemical composition of a substance atoms or molecules are rearranged a physical change is a change in the physical state the atoms or molecules are not rearranged  an example of a chemical change is the formation of rust iron reacts with oxygen to form iron 3 oxide an example of a physical change is the freezing of water  let's practice distinguishing between chemical and physical changes boiling water water is the state of water from a liquid to a gas so it is a physical change  glass breaking also changes the physical nature of the glass not the chemical nature it doesn't become a new substance atoms are not real burning paper when paper is burned in the presence of oxygen it becomes a new substance atom rearrange the chemical change  iron rusting we've already seen on the previous slide that iron rusting is a chemical change this concludes Lesson 1.1 on matter please proceed the quiz 1.1 before continuing on to the next lesson

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Classification of Mater

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