Praxis II general science study guide with complete solutions
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Course
Praxis 5435
Institution
Praxis 5435
Praxis II general science study guide
with complete solutions
matter - Answer️️ -anything that has mass and occupies volume
made up of atoms and molecules
Lab Safety Rules (12) - Answer️️ -1. Report all accidents
2. Clear pathways
3. No loose hair or clothing
4. Read instructions
5....
* Capability to undergo a certain set of transformations, for ex chemical combination,
redox reactions
* Preferred types of chemical bonds to form, for example metallic, ionic, covalent
Pure Substance - Answer✔️✔️-no separation by physical means
A substance made of only one kind of matter and having definite properties.
Chemical Element - Answer✔️✔️-Pure chemical substance consisting of one type of
atom distinguished by its atomic number, which is the number of protons in its nucleus
chemical compound - Answer✔️✔️-pure chemical substance consisting of two or more
different chemical elements that can be separated into simpler substances by chemical
reactions
Solutions - Answer✔️✔️-molecules that are mixed up in a completely even distribution,
homogenous systems
A mixture where substances are distributed evenly. Has a solvent & solute.
Mixture - Answer✔️✔️-Substances held together by physical forces, not chemical, can be
homogeneous and heterogeneous
Elements - Answer✔️✔️-pure chemical substance, one type of atom, distinguished by its
atomic number (Z), the number of protons in its nucleus
# of protons determines chemical properties
Mass number (A) is the number of nucleons (p+N) in nucleus
Oxygen most abundant on earth,
Hydrogen most abundant in universe
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