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Ch. 1: Intro To Chem

What is Chemistry? The study of matter and energy and the interactions between them
What are the 2 requirements for something to be classified as matter? 1. It has mass. 2. It occupies space.
What is energy? The ability to do work
Are forms of energy considered matter? Why or why not? No, because they don't have mass
What is mass? The amount of matter in an object
What is volume? The amount of space an object occupies
What is weight? A type of force that depends on the gravitational force
What is the difference between mass and weight? Mass stays the same, and weight changes as the gravitational force changes.
Describe solids. Definite shape and volume
Describe liquids. Definite volume, indefinite shape
Describe gases. Indefinite shape and volume
What are the 3 things that states of matter depend on? 1. Temperature 2. Pressure 3. Strength of the forces holding particles together
What is a physical property? A property that doesn't change the identity of a substance
What is a chemical property? A property that changes substance into another substance by going through a chemical reaction
Is toxicity a physical or chemical property? Chemical
Is hardness a physical or chemical property? Physical
What happens during a physical change? A substance changes its physical appearance but not its chemical composition
What happens during a chemical change? A substance changes into another substance by going through a chemical reaction
What is an intensive property? A physical property that doesn't depend on the quantity
What is an extensive property? A physical property that depends on the quantity
What is a substance? A material that is chemically the same throughout
What is a pure substance? Matter that has distinct properties, definite composition, and can't be separated into simpler substances by physical means
What is an element? A pure substance that can't be reducted to simpler substances by normal chemical means
How many elements are there in all? 117
How many elements are naturally occuring? 92
How many elements are synthesized in a lab? 25
What are compounds? Pure substances that are a combination of 2 or more elements and can be broken into simpler substances by chemical means
What is an atom? The smallest particle of an element?
What are molecules? A combination of 2 or more atoms
What are mixtures? A combination of 2 or more pure substances
What is a homogeneous mixture? A mixture that is uniform throughout and has only 1 visibly distinct face
What is a heterogeneous mixture? A mixture that isn't uniform throughout and has 2 or more different visibly distince faces
What are homogeneous mixtures also called? Solutions
Can mixtures be separated by physical means? Yes
What are colloids? Particles too large to be considered homogeneous and too small to be considered heterogeneous
What arethe diatomic elements? Hydrogen, Nitrogen, Oxygen, Fluorine, Bromine, Chlorine, and Iodine
Created by: bnahmed101



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