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Chemistry ch. 1 & 2

Modern Chemistry - a few random cards

Mass the measure of the amount of matter
volume the amount of 3D space an object occupies
atom the smallest unit of an element that maintains the chemical identity of that element.
element pure substance that cannot be broken down into simpler, stable substances. Made of one atom.
extensive properties depend on the amount of matter present. volume, mass, amount of energy in a substance
intensive properties do not depend on the amount of matter present. melting point, boiling point, density, and ability to conduct electricity and transfer heat.
alloy a substance composed of two or more metals (or metals & a nonmetal)
molecule the smallest unit of an element or compound that retains all of the properties of that element or compound
colloid a mixture consisting of tiny particles that are intermediate in size between those in solutions & those in suspensions and that are suspended in a liquid, solid, or gas
suspension a mixture in which particles of a material are more or less evenly dispersed throughout a liquid or gas.
ductility the ability of a substance to be hammered thin or drawn out into a wire
group vertical column
malleability the ability of a substance to be hammered or beaten into a sheet.
period horizontal row. elements in a period tend to be the most similar to each other
tensile strength a measure of the ability of material to resist a force that tends to pull it apart.
scientific method a logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses and formulating theories that are supported by data.
system a specific portion of matter in a given region of space that has been selected for study during an experiment or observation.
quantitative numerical data
qualitative descriptive data when observing
quantity something that has size, magnitude, or amount.
SI the meter, kilogram, second, kelvin (temp.), mole (amount of substance), ampere (electric current), and candela (luminous intensity)
weight the measure of gravitational pull on an object
derived unit combination of SI base units
conversion factor a ration derived from the equality between two different units that can be used to convert from one unit to the other.
dimensional analysis a mathematical technique that allows you to use units to solve problems involving measurements.
Density equation D = M / V
Percentage error equation experimental value - accepted value divided by accepted value, times 100
accuracy closeness to actual measurement
precision closeness to your other measurements
significant figures rules - zeros between nonzero digits are significant (5008) - zeros at the end of a number & to the right of a decimal place are significant (9000 or .09)
directly proportional if you can divide one by the other & get a constant value (straight line)
inversely proportional their product is constant. hyperbola.
Created by: Emilyy28