what is the best method to classify a chemical substance
What is a chemical substance
A chemical substance is a form of matter having constant chemical composition and characteristic properties. Chemical substances can be simple substances, chemical compounds, or alloys
Examples: Baking soda (sodium bicarb)
Salt (sodium chloride)
Diamonds
water (H2O)
chemical substances that have been taught
What defines them?
An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance
A gas is a substance that is in a gaseous, or vaporous, state of matter
A metal is any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
How to tests if it is an ionic compound
Method
Ionic bodning: Disolve them nto water and then test if its a conductor of electricity
Limitations
Ionic bonding can be tested by dissolve them in water. Ionic compounds will break into ions and allow the solution to conduct an electric current, typically brittle
Risk assesment
Convelent bonding will not disolve in water, has a lower boiling/heating point
No variables, because there is no proper data
Convelent bonding does not have a high melting point, not solid at room temp. can not have conduct electricty Example: water
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Metal/non metal
Metals
Conduct heat and electricity, Ductile, can be smashed and bended into different shapes Hi melting point due to the strong bond
Nonmetals
Brittle, dull (no shine) poor conductors of electricty and heat
Metaloids
Conduct elecricty but not as well as metals, have the shine and luster like metals, brittle
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Toxic substances: inhaling or diesting these substances can lead to harm of someone
Fire from bunsen burners: The bunsen burners need to be on safety flame if not in use melting or boiling a substance