Chem Chapter 1 Flashcards

Terms Definitions
Chemistry
The science that investigates and explains the structure and properties of matter.
Matter
Anything that takes up space and has mass. It is everywhere around you.
Mass
The measure of the amount of matter that an object contains. Ideas, thoughts aren’t matter
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.
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.
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.
Scientific Models
Thinking device that helps you understand macroscopic observations
Qualitative Observations
Observations made without measuring.
Quantitative observations
Observations made that involve measurement. For example, the temperature of a substance.
Pure substances
Matter with the same fixed composition and properties. Any sample of pure matter is a substance.
Mixtures
A combination of two or more substances in which the identity of one substance doesn’t change
Heterogeneous mixtures
a mixture is one that does not have a uniform composition and in which the individual substances remain distinct.
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.
Aqueous Solutions
When the solvent is water
Alloys
Solid solutions that contain different metals and sometimes non metallic substances
Solute
the substance that is being dissolved
Solvent
the substance that dissolves the solute
Elements
The simplest form of matter
Compounds
A compound is a chemical combination of two or more different elements joined together in a fixed proportion.
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.
Physical Properties of matter
Properties that don't involve changes in composition. Many are qualitative and quantitative.
Volatile
Means that substances change to gas easier than other substances
Endothermic Reactions
Chemical reactions that absorb heat
Exothermic reactions
Chemical reactions that give off heat
Energy
the capacity to do work
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
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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