Chemisrty
Element
Compound
Mixture
Mixture is more than one substance
Has more than one element properties making it up
Atoms make up elements
The simplest type of pure substance
Has the same properties throught
Molecule
The smallest part of any compound that retains all properties of that compound
Matter
Liquid
solid
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Standards
PS1-2
PS1-4
PS1-1
PS1-5
Develop a model to describe that (a) atoms combine in a multitude of ways to produce pure substances which make up all of the living and nonliving things that we encounter, (b) atoms form molecules and compounds that range in size from two to thousands of atoms, and (c) mixtures are composed of different proportions of pure substances.
Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
Develop a model that describes and predicts changes in particle motion, relative spatial arrangement, temperature, and state of a pure substance when thermal energy is added or removed.
Use a model to explain that atoms are rearranged during a chemical reaction to form new substances with new properties. Explain that the atoms present in the reactants are all present in the products and thus the total number of atoms is conserved.
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A pure substance that contains two or more elements.
mixture
Matter that consists of two or more pure substances that are physically but not chemically combined.
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phase changes
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solid to liquid
liquid to solid
liquid to gas
freezing point
boiling point
melting point
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Phase changes are physical changes of a substance from one state (solid or liquid or gas) to another without a change in its chemical formula / composition.
gas
a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape and no fixed volume
a substance that flows freely but is of constant volume
firm and stable in shape
