Johndocs

Democritus️️Matter is made of "indivisible parts" he called atomos "meaning cannot be cut" Democritus️️Because of his ideas, we still call these particles atoms Dalton️️Proposed that atoms are small indivisible spheres Dalton's Atomic Model️️Billard Ball model and was hard sphere (model) J.J Thompson️️He did experiments with cathode ray tubes. J.J Thompson️️He found that all atoms contain a little particle called electron. Thompson's Atomic Model️️-called...

Erlenmeyer flasks️️contain liquids beaker️️contain liquids reaction plate️️contain small amounts of liquids and solids graduated cylinders️️measure liquid volume watch glasses️️evaporate solutions test tubes️️contain liquids and solids funnels️️transfer and filter solutions stirring rods️️stir solutions; transfer precipitates beral pipets or droppers️️transfer liquids crucible and lid to heat solids at high temperatures️️heating solids Florence f...

Hydrogen️️H Helium️️He Lithium️️Li Beryllium️️Be Boron️️B Carbon️️C Nitrogen️️N Oxygen️️O Fluorine️️F Neon️️Ne Sodium️️Na Magnesium️️Mg Aluminum️️Al Silicon️️Si Phosphorus️️P Sulfur️️S Chlorine️️Cl Argon️️Ar Potassium️️K Calcium️️Ca Scandium️️Sc Titanium️️Ti Vanadium️️V Chromium️️Cr Manganese️️Mn Iron️️Fe Cobalt️️Co Nickel️️Ni Copper️️Cu Zinc️️Z

chemical bond️️the attractive force that holds atoms or ions together ionic bonding️️a force that attracts electrons from one atom to another, which transforms a neutral atom into an ion. covalent bonding️️a bond formed when atoms share one or more pairs of electrons nonpolar-covalent bond️️a covalent bond in which the bonding electrons are equally attracted to both bonded atoms polar️️describes a molecule in which the positive and negative charges are separated polar-...

What is the Law of Conservation of Mass?️️The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes. What is the Law of Definite Proportions?️️The law that states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass. What is the Law of Multiple Proportions?️️The law that states that when two elements combine to form two or more compounds, the mass of one element that combines wit...

matter️️anything that has mass and takes up space atoms️️-the building blocks of matter -the simplest part of an element element️️-each one is made of the same kind of atom -cannot be broken down any further by chemical means currently there are ___ elements️️115 chemical symbol️️-1 or two letters -first letter always capitalized, the second never, chemical "shorthand" -most are derived from either Latin or Greek -some are named after famous scientists -even count...

Atomic radius️️Half the distance between two identically bonded atoms Ionic radius️️The radii of the most commonly found ion of the element. First Ionization Energy️️The energy required to remove one electron from a neutral atom of an element. Electron Affinity️️The energy change that occurs when an electron is acquired by a neutral atom Number of Valence Electrons️️The electrons that are available to be lost, gained, or shared in the formation of chemical compounds. ...

A ________ is the process by which one or more substances are changed into one or more different substances.️️chemical reaction A ___________ represents, with symbols and formulas, the identities and relative molecular or molar amounts of the reactants and products in a chemical equation.️️chemical equation What are the four ways to tell if a chemical reaction has occurred?️️evolution of energy as heat and light, color change, production of gas, and the formation of a precipitat...

Biology️️the scientific study of life What is the fundamental property of ecosystems?️️interactions between the (living and nonliving)things in them Life's hierarchy of organization️️Biosphere > Ecosystem > Community > Population > Organism > Organ System > Organ > Tissue > Cell > Organelle > Molecule Ecosystem️️all the organisms living in a particular area, as well as all the nonliving, physical components of the environment that affect the o...

What are the steps of the scientific method?️️Observation, question, hypothesis, experiment, analysis, conclusion What are the 7 characteristics of living things?️️CHEMGER: cells, homeostatis, energy, metabolism, growth, evolution, reproduction What is the difference between a molecule, atom, compound, and element? (give an example)️️order in size: atom, element, molecule, compound O O H2O H2O atoms make elements 2+ atoms make molecules 2+ elements make compounds How is an ...