Warm-Up: 2/4 Classifying Elements Head a sheet of paper and title it: Elements, Compounds, and Mixtures Notes Science Binder page 32 Make a subheading (smaller title under the main title) Warm-Up: 2/3 Classifying Elements
Write a short paragraph explaining what makes something an element. Include examples. Elements, Compounds and Mixtures Notes Science Binder p. 32
Classification of Substances
Elements Molecules Compounds Mixtures Elements Elements are
substances made up of only one type of atom. Example Hydrogen, Gold.
Elements Pure substance that cannot be separated into simpler substances by physical or chemical means. Pure substance- a substance in which there is only one type of particle (atom or molecule)
Periodic Table of Elements Molecule A molecule is made up of two or more atoms
chemically bonded. Atoms can be the same or different! Compounds
Compounds are pure substances made up of two or more different types of atoms chemically bonded. Properties of Compounds When a compound is formed during a chemical reaction its properties differ from
those of the elements it is made of. Example: Water is made from hydrogen and oxygen. Hydrogen flammable gas Oxygen colorless gas. Compounds Represented by chemical formulas with two
or more chemical symbols (each capital letter = a new chemical symbol/element) NaCl = sodium chloride (table salt) H2O2 = hydrogen peroxide C6H12O6 = glucose (sugar plants make from photosynthesis)
Chemical Formulas subscript- small number located at the bottom right of a chemical symbol, and gives the number of atoms for the element in that molecule Mixtures
A mixture consists of two or more different substances mingled together but not chemically combined. Examples: Sea water and salt Air nitrogen, oxygen Soil sand, clay, humus
Compare mixtures and Compounds. Mixture
Compound The amounts of the substances in the mixture can vary. The elements in a compound are always present in the same fixed
proportion. A mixture contains two or more substances A compound is a single substance.
The properties of a mixture are The properties of a compound similar to those of the substances are different to those of the in a mixture. elements which reacted to form it. There are practically no energy Heat is usually given out or
changes when a mixture is made taken in when a compound is formed. It is usually easy to separate the components of a mixture. It is usually difficult to separate the components of a compound.
iron particles Key: one iron particle strong bonds between iron particles iron particles held together
by strong bonds iron particles iron particles are attracted to a magnet iron particles
diagram sulfur particles Key: one sulfur particle strong bonds between sulfur particles
sulfur particles held together by strong bonds sulfur particles sulfur particles are not attracted to a magnet
sulfur particles diagram iron particles
sulfur particles Whats this? A mixture of iron and sulfur particles strong bonds
between iron particles strong bonds between sulfur particles A mixture
of iron and sulfur particles A magnet attracts the iron particles but not the sulfur particles. The mixture is separated
mixture diagram Whats this? A compound between iron and sulfur particles one iron particle
one sulfur particle strong bonds between iron and sulfur particles A compound between iron and sulfur particles
strong bonds between iron and sulfur particles The magnet cannot separate iron and sulfur particles in a compound
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