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science test dec. 2

cumulative test

QuestionAnswer
What do atoms need to do to bond with each other? They have to be nearly empty or nearly full.
What is the reason for atom bonding? To have a full/stable outer shell.
How do atoms bond? By losing or gaining electrons.
What are two examples of unfriendly atoms? Half full outer shells and items with full outer shells.
What is an ionic bond? when either a loss or gain of electrons is taking place.
What is an ion? an atom that has a charge.
Atoms in their elemental state are... neutral
_________are atoms with a positive charge. cations
_________are atoms with a negative charge. anions
physical properties can be observed without ________ ________ matter. chemically changing
Chemical properties describe how a _______ _______ react with different substances. substance interacts
Name six physical properties. malleability, density, color, texture, solubility, mass.
Solids have ________ shape and ________volume. definite, definite
In a solid, particles are ______ ________. packed together.
_______ have indefinite shape and definite volume. liquids.
_____ have __________ shape and __________ volume. Gases, indefinite, indefinite.
A physical change has ____ ________ in identity of a substance. no change
A chemical change has one or more ______ substances provided. new
Freezing point is from liquid to ________. solid
Melting point is from solid to ___________. liquid
boiling point is _________ to _______. liquid to gas.
condensation point is gas to ________. liquid
sublimation point is ________ to ______. solid to gas.
physical changes include... tearing, crushing, phase changes
chemical changes include... combustion, acid rain
The Law of Conservation of Mass states that mass cannot be ________ nor ____________. created nor destroyed.
Define a family. The number of valence electrons in an atom.
What is a period? The number of energy levels in an atom.
How many electrons can each level hold? 1st= 2 2nd=8 3rd=18
What is the term used for the electrons in the outermost shell or energy level? valence.
After atoms bond and form chemical compounds, they... react with other chemical compounds or atoms.
The chemical reaction indicates a _________ ________. Chemical change
The Law of Conservation of Mass tells us that after reactants go through a _________ ________, the number of atoms in the _________ must be equal to the number of atoms in the _________. chemical reaction, product, reactants.
The number of atoms on either side of the arrow must be ______. equal.
We count the number of _________ on each side and use ___________ to __________ the equation. atoms, coefficients, balance.
When atoms share electrons a _________ bond is taking place. covalent
What do atoms form when they bond? a compound
The formation of a compound is the result of a ________ ________ because a new substance with ____ __________ has been found. chemical change, new properties.
What does the nucleus contain? protons and neutrons.
What does the atomic number represent? atomic mass minus protons
neutrons=_______minus__________ atomic mass minus protons.
What is an atom? The smallest particle into which an elemental can be divided and still be the same substance.
If the number of protons and electrons are not equal the atom becomes a _______ _________. charged particle
What are some characteristics of metals? shiny, good conductors, malleable, ductile.
What are some characteristics of metalloids? semi conductors, shiny or dull, somewhat malleable or ductile.
What are some characteristics of nonmetals? dull, poor conductors, unmalleable, brittle.
Created by: wahlemm
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