Physical & Chemical Properties
Terms in this set (35)
A characteristic of a substance that is usually observed using senses ( composition does NOT change)
examples of physical properties
density, boiling point, melting point, color, hardness, solubility, magnatism
A change in size, shape, state, etc.... that alters the form or appearance of a material , but does NOT make the material into another substance.
examples of physical changes
(each substance retains its properties - no new substances are formed) breaking, cutting, bending, molding, phase changes: evaporating, boiling, freezing, condensing, vaporizing, melting, dissolving, sorting & filtering
NEW substance is formed, when a substance changes identity (ex: burning, explosion, rotting, rusting
Examples of chemical changes
Photo fades, paper burns, iron rusts, sodium reacts with water, magnesium reacts with acid, electrolysis of water produces hydrogen and oxygen gases
characteristics of substance that indicates it id can undergo a certain chemical change (ex: flammability, combustible, reacts with oxygen in air
Examples of chemical properties
combustible, reacts in the presence of light, flammable, reacts with oxygen in air, reacts with water, reacts with acid, is decomposed by electricity, produces a gas when heated, forms a precipitate
Difference between physical and chemical change
chemical change makes a new material with different properties and physical changes size,shape or taste but keeps the same identity, a physical change can normally be UNDONE.
5 types of chemical reactions
synthesis, decomposition, combustion, single replacement, and double replacement
A chemical reaction in which two or more simple substances combine to form a new, more complex substance. Ex: A+B= AB
A reaction in which a single compound breaks down to form two or more simpler substances. = the opposite of synthesis reaction.
single replacement reaction
one element replaces a second element in a compound
Ex: AB+C ------> A+BC
double replacement reaction
two elements trade partners in a retain to form two new substances: Ex: AB + CD = AD + BC
needs a fuel and oxygen
CH+O2 ----> CO2+H20
prediction single replacement reactions
they will or will not react based on the strength of the elements that are exchanging
state of matter
One of the three forms (solid, Liquid, and gas) that matter can exist in
A substance that contains no water molecules.
A compound that contains water of hydration
properties of physical change
color, texture, shape, maliable or not, boiling points and melting point
properties of chemical change
Fizzing (gas produced), colour change, energy change (heat produced or absorbed, light is emitted) and precipitation
A change in which one or more substances are converted into new substances ( new substance will have different properties than original substances)
A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products
A starting material in a chemical reaction
Ending materials in a chemical reaction. (new substance formed)
Law of Conservation of Mass
In a chemical reaction, ass cannot be created or destroyed , mass is conserved
conservation of mass
A chemical equation must be balanced, same number of atom on both sides of equations
gives the number of atoms of the element in the compound
Number of compounds that are present (the number that goes before the chemical formula of a substance) We will create these and only these to balance a chemical equation
A mole is a counting unit used to measure amounts of a substance. It is 6.02 x 10^23 particles of that substance.
Amedeo Avagadro Number
6.022 x10^23 : the number of particles in one mole of any substance particles
tiny, too small to be weighed individually on a balance, too small to see, mass of mole depends on its substance
Elements that are made of small particles
Chemicals that result from atoms linking together.
Atom that has a positive or negative charge
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