Chemistry

matter into pure substances and mixtures into elements and compounds and heterogenous and homogeneous

only one type of particle, fixed proportion

two or more types of particles, unknown combination

elements (each identical particle contains only one type of atom, elements are on the periodic tables) ex. gold, calcium, oxygen

heterogenous (clumps of each substances can be seen ex. lucky charms) and homogeneous (the different particles are so well mixed it LOOKS like one substance (ex. steel or vinegar)

changes state, dissolving, crushing, mixing. it’s still the same substance. ex. colour, texture, density, smell, solubility, taste, melting point and physical state

light or heat released, heat absorbed, colour change, new gas (bubbles, smell) one new solid (precipitate), generally difficult to reverse

a pure substance that cannot be broken down into simpler substances

a description of a substance that does not involve forming a new substance

a description of what a substance does as it changes into one or more new substances

a row of elements in the periodic table

a column of elements in the periodic table with similar properties

the elements (except hydrogen) in the first column of the periodic table (group 1)

the elements in the second column of the periodic table (group 2)

the elements in 17th column of the periodic table (group 17)

the elements in the 18th column of the periodic table (group 18)

a model representing the arrangements of electrons in orbits around the nucleus of an atom

did you?

a pure substance composed of 2 or more elements in a fixed ratio

a charged particle that results when an atom gains or loses one or more electrons

a positively charged ion

a negatively charged ion

a compound made up of one or more positive metal ions (cations) and one or more negative non-metal ions (anions)

the simultaneous strong attraction of positive and negative ions in an ionic compound