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Science Vocabulary
Question | Answer |
---|---|
reactive group of elements with 2 valence electrons (group 2 of PT) | alkaline earth metals |
law stating that an atom cannot be created or destroyed | law of conservation of matter |
small numbers on chemical formula indicating the number of atoms in an element/compound | subscript |
substances that are created as the result of a chemical reaction | products |
change in substances creating a new compound | chemical change |
positively charged particle found in the nucleus of an atom | proton |
atomic model representing all electrons and energy levels | bohr model |
smallest particle of matter | atom |
forms the same element with different numbers of neutrons | isotope |
electrons on the outer shell of an atom that participates in bonding | valence electron |
a way of representing atoms/molecules by showing valence electrons as dots | lewis dot structure |
chemical bonds created when electrons are shared (nonmetal + nonmetal) | covalent bond |
atom or molecule with a net charge due to loss or gain of electron | ion |
neutrally charged particle found inside the nucleus of an atom | neutron |
big numbers in front of a compound indicating the number of molecules | coefficient |
chemical bonds created when electrons are transferred (metal + nonmetal) | ionic bond |
negatively charged particle found around the nucleus of an atom | electron |
substances that take part in a change during a chemical reaction | reactant |
change that does not involve a change in substances' chemical composition | physical change |
drawing a conclusion based on data and observation | inference |
the base unit of measurement for length in the metric system | meter |
variables that are kept the same (controlled variables) | constant variables |
describing something based upon your five senses | observation |
universal method of measurement | metric system |
the base unit of measurement for mass in the metric system | gram |
variables that are intentionally changed to see the effect | independent variable |
variable being measured | dependent variable |
observable data that is not measured | qualitative data |
data which can be measured | quantitative data |
the base unit of measurement for volume in the metric system | liter |
possible explanation or answer to a question; "educated guess" | hypothesis |
horizontal rows in the periodic table where elements in each row have the same number of atomic orbitals | period |
very reactive group of elements with 7 valence electrons | halogen |
shiny, dense, ductile elements found on the left side of the PT | metals |
substance made of one type of atom; this is the basic substance that cannot be broken into simpler substances | element |
elements that are dull, non-conductors of electricity or heat; found on the right side of the PT | non-metals |
vertical columns in the periodic table where elements in each column have the same number of valence electrons | group/family |
two or more atoms/molecules physically together, not bonded | mixture |
two or more atoms chemically bonded | compound |
unreactive group of elements with a full set of valence electons (group 18 of PT) | noble gases |
Russian chemist who formulated the periodic table based on the periodic law | Dmitri Mendeleev |
anything that has mass and volume | matter |
elements that have properties of both metals and non-metals | metalloids |
very reactive group of elements with 1 valence electron (group 1 on PT) | alkali metals |
reactive group of elements with 2 valence electrons (group 2 of PT) | alkaline earth metals |
length and direction of a straight line between starting and ending points (vector) | displacement |
how fast an object travels (distance/time) | speed |
quantity represented by magnitude alone | scalar quantity |
a change in position relative to a reference point | motion |
speed and direction of an object in motion | velocity |
a stationaty point or something to describe position or motion | refernce point |
rate of change in velocity | acceleration |
quantity represented with an arrow with both direction and magnitude | vector quantity |
total path between two points (scalar) measured in meters (vector) | distance |
an objects distance in a certain direction from a reference point | position |