Praxis II general science Exam Study Guide with Complete Solutions
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Course
Praxis 5435
Institution
Praxis 5435
Praxis II general science Exam Study
Guide with Complete Solutions
matter - Answer️️ -anything that has mass and occupies volume
matter is made up of atoms and molecules
ionic nature of matter - Answer️️ -Ions are formed when atoms, or groups of atoms,
lose or gain electrons.
Metals l...
mixture: substances held together by physical forces, not chemical, can be
homogeneous and heterogeneous
A homogeneous mixture is called a solution
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
Elements with atomic numbers 83 or higher are inherently unstable, and undergo
radioactive decay
The abundance of the lightest elements is well predicted by the standard cosmological
model, since they were produced shortly after the Big Bang, in a process known as Big
Bang nucleosynthesis. Heavier elements were mostly produced much later, inside stars.
chemical change - Answer✔️✔️-* Decomposition
* Neutralization (Mixing acid+base=water and a salt).
* Photosynthesis -co2 and water are changed into sugars.
* Cooking examples: cake, pancakes, and eggs/bacon
* Oxidation examples: rust or tarnishing
* Ripening examples: bananas, tomatoes or potatoes
Evidence
* Change of odor
* Change of color
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