Chem Chapter 1

Chem Chapter 1 - Term Definition Chemistry The science that...

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Unformatted text preview: Term: Definition: Chemistry The science that investigates and explains the structure and properties of matter. Term: Definition: Matter Anything that takes up space and has mass. It is everywhere around you. Term: Definition: Mass The measure of the amount of matter that an object contains. Ideas, thoughts aren't matter Term: Definition: Properties of Matter Properties of matter- the properties of matter describe the characteristics and behavior of matter, including the changes that matter undergoes. You can find out the different properties of matter just by looking at its features. Is it a solid, liquid, or gas. If it is a solid, is it hard? Does it burn? These are some ways to see matter's different properties. Term: Definition: Macroscopic Level of Matter Matter that is large enough to be seen is called macroscopic. The macroscopic level is one that you can see, smell, touch or feel. Term: Definition: Submicroscopic level of matter This level of matter gives you a glimpse into the world of atoms. It is so small that you can't see it with the most powerful light microscope. Term: Definition: Scientific Models Thinking device that helps you understand macroscopic observations Term: Definition: Qualitative Observations Observations made without measuring. Term: Definition: Quantitative observations Observations made that involve measurement. For example, the temperature of a substance. Term: Definition: Pure substances Matter with the same fixed composition and properties. Any sample of pure matter is a substance. Term: Definition: Mixtures A combination of two or more substances in which the identity of one substance doesn't change Term: Definition: Heterogeneous mixtures a mixture is one that does not have a uniform composition and in which the individual substances remain distinct. Term: Definition: Homogeneous Mixtures means to be the same throughout. it can also be called a solution. Even though solutions can be one pure substance, their compositions can vary. For example, you could make your tea very sweet by dissolving more sugar into it. Term: Definition: Aqueous Solutions When the solvent is water Term: Definition: Alloys Solid solutions that contain different metals and sometimes non metallic substances Term: Definition: Solute the substance that is being dissolved Term: Definition: Solvent the substance that dissolves the solute Term: Definition: Elements The simplest form of matter Term: Definition: Compounds A compound is a chemical combination of two or more different elements joined together in a fixed proportion. Term: Definition: Formula of compounds a combination of the chemical symbols that show what elements make up a compound and the number of atoms of each element. Term: Definition: Physical Properties of matter Properties that don't involve changes in composition. Many are qualitative and quantitative. Term: Definition: Volatile Means that substances change to gas easier than other substances Term: Definition: Endothermic Reactions Chemical reactions that absorb heat Term: Definition: Exothermic reactions Chemical reactions that give off heat Term: Definition: Energy the capacity to do work Term: Definition: Chemical properties those that can be observed only when there is a change in the composition of the substance. A chemical property always relates to a chemical change Term: Definition: Physical changes in matter a change in matter that does not involve a change in the identity of the substance. Examples would be boiling freezing, melting, evaporating, dissolving, and crystallizing. ...
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