Science Test Periodic Table And Corrosion Flashcards
5 properties of non metals
Higher electronegativity, forms acidic agents, good oxidising agents, poor conducter of heat and electricity, no luster
5 properties of metals
Opaque, ductile, malleable, luster, good conducter of heat and electricity
Metals in periodic table
Bottom left, iron, gold, silver
Non metals in periodic table
Far left, hydrogen, helium, carbon
Solids at room temperature
Hydrogen, nitrogen, oxygen, fluorine, chlorine
Liquids at room temperature
Bromine, mercury
Gases at room temperature
Hydrogen, nitrogen, oxygen, fluorine, chlorine
Mixture
Physically mixing 2 or more substances e.g mud, smog
Compound
Chemically mixing 2 or more diff atoms e.g baking soda, water
Element
Chemically pure substance e.g helium, oxygen
Molecule
Group of atoms bonded together e.g water, salt
Matter
Made up of atoms e.g apple, person
Atoms
Exists in diff forms e.g elements, molecules, compounds
Combustion
Chemical reaction, substance reacts with oxygen like wood, wick, gas, petrol
How to stop combustion
Remove fuel, heat, oxygen
Galvanizing
Applying zinc coating to steel or iron
Alloying
Mixing metals or elements to form protective layer
Coating
Coating surface with paint or enamel, providing barrier
Combustible substances burn above
37.8
Flammability
How easily something burns or ignites
Substances are grouped as either
Flammable or combustible by their flashpoints
Flashpoint
When lowest temp, vapours ignite
Flammable substances burn below
37.8
Corrosion
Chemical reaction, metal reacts with oxygen
Rusting
Iron reacts with oxygen
Diff between corrosion and rusting
Corrosion is for all metals and rusting is for iron
