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Science Test
cumulative
Question | Answer |
---|---|
What do atoms need to bond with each other? | 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 atoms 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... | nuetral |
_______ 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 ______ ______ interacts with other substances | substance interacts |
Name six physical properties | Malleability, density, color, texture, solubility, mass |
solids have _____ shape and ______ volume | definite, defenite |
in a solid particles are ______ _________ | packed together |
_______ have indefinite shapes and indefinite 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 from ______ to _________ | solid to gas |
condensation point is _____ to _______ | gas to liquid |
sublimation point is ______ to _________ | solid to gas |
physical changes include... | tearing, crushing, phase changes |
chemical changes include... | combustion and acid rain |
the law of conservation of mass states that mass can not be _______ nor ________ | created nor destroyed |
define a family | the number of valance electrons inside a family |
what is a period | the number of energy levels in an atom |
how many electrons can each level hold | 2,8,18 |
What is the term used for the electrons in the outermost shell or energy level | valance |
After atoms bond and form chemical compounds they... | react with other chemical compounds or atoms |
a chemical reaction indicates a _____ _________ | chemical change |
The Law of Conversation 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 _______ is taking place | covalent bond |
Why is the covalent bond the strongest type of bond? | because molecules are formed |
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 formed | chemical change, new properties |
What does the nucleus contain? | protons and nuetrons |
What does the atomic number represent? | protons and electrons |
Nuetrons = _____ minues _________ | Atomic mass minus protons |
What is an atom? | the smallest particle into which an element can be divided and still be the same substance |
If the number of protons and electrons are not equal the atoms becomes a _______ ___________ | charged particle |
What are some characteristics of Metals? | shiny, good conductors, malleable, ductile |
What are some characteristics of Metalloids? | emi conductors, shiny or dull, somewhat malleable or ductile |
What are some characteristics of Nonmetals? | dull, poor conductors, unmalleable, britttle |