CHEMISTRY Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Term | Definition |
chemistry | The science that deals with the materials of the universe and the changes these materials undergo |
measurement | observations that involve a number and unit |
scientific method | a pattern of investigation procedures |
bias | occurs when a scientist's expectations change how the results are analyzed or how the conclusions are made |
theory | explanation based on repeated observations and investigations |
natural law | a statement about what happens that seems to be true all of the time |
experiment | a method of collecting data to test a hypothesis |
matter | the stuff that the universe is made of |
atom | a fundamental unit of which elements are made |
element | only one type of atom |
allotrope | the same element, but with a different physical form |
compound | atoms of different elements that form a new substance |
molecule | a collection of atoms bonded together that behave as a unit |
physical change | does no effect the composition |
chemical change | when a new substance is formed |
mixture | substances added together without chemical change |
alloy | a solid mixture with metallic properties |
pure substance | either a pure element or compound |
homogeneous mixture | a mixture that is the same throughout |
heterogeneous mixture | a mixture with regions of different properties |
distillation | separation process that depends on the different boiling points of the substances |
filtration | separating by using filter paper |
law of constant composition | a given compound always contains the same proportion of elements |
the Rutherford experiment | discovered that the atom is mostly empty space |
valance electrons | electrons in the outer level or sub level that are involved in reations |
atomic numer | the number of protons |
atomic mass | the number of protons and neutrons |
isotope | the same element but with a different number of nuetrons |
average atomic mass | the average mass of all the isotopes of an element |
half life | the amount of time it takes for half of a sample of an isotope to break down into other elements |
carbon dating | using the decay of C-14 to determine the age of organic substances |
families | columns on the Periodic table |
periods | rows on the Periodic table |
electron dot structure | a shorthand method of showing the number of valance electrons |
ion | an atom that has gained or lost electrons |
oxidation number | the charge of an ion |
chemical bond | the force that holds atoms together in a compound |
ionic bond | where electrons are transferred, creating opposite charges which attract |
chemical formula | indicates the elements in a compound and the ratio of the elements |
binary 1 compound | includes two elements, an A group metal and nonmetal |
binary 2 compound | includes a transition metal and nonmetal |
binary 3 compoud | includes two nonmetals |
polyatomic ion | a group of charged atoms that act as a single ion |
acid | a substance that donates a hydrogen ion |
standard | the exact quantity that people use to compare measurements |
length | straight line distance between two points |
mass | the amount of matter in an object |
volume | amount of space occupied by an object |
density | the mass per unit volume of a material |
temperature | the average kinetic energy of all particles in an object |
scientific notation | the shorthand method of reporting large and small numbers |
accuracy | the degree to which a measurement agrees with the actual value |
precision | the refinement in a measurement |
significant figures | those digits that carry meaning and contribute to precision |
molar mass | the mass of 1 mole of a sbustance |
percent composition (by mass) | the percent of the mass a compound makes up in an element |
empirical formula | the smallest whole number ratio of elements in a compound |
molecular formula | a formula of a compound that indicates the true number of the atoms of each element |
hydrate | a compound with water chemically attached to it |
chemical reaction | a well-defined example of a chemical change |
strong electrolyte | completely splits apart in a solution |
nonelectrolyte | has no ions and doesn't split in a solution |
molecular equation | equation where all species are listed as molecules |
complete ionic equation | equation where all ions are included before and after |
net ionic equation | equation that removes all spectator ions |
synthesis | a reaction where two or more substances combine to form a new, simpler substance |
combustion | a reaction where CO2 and H2O are formed |
decomposition | a reaction where one substance breaks into two or more simpler substances |
single-displacement | a reaction where one element replaces another in a compouund |
acid- base reactions | a reaction where H2O and a salt are formed |
oxidation-reduction | a reaction where electrons are transferred |
oxidized | becomes more positively charged |
reduced | becomes more negatively charged |
salt | an ionic compound whose cation comes from a base, and anion from an acid |
double-displacement | a reaction where a precipitate, water, or gas is formed when two ionic compounds in a solution are combined |
activity series | a list of metals arranged in decreasing ease of oxidation |
Created by:
cld19
Popular Chemistry sets