Chemistry Flashcards
Implosion
an instance of something collapsing violently inwards
Explosives
able or likely to shatter violently or burst apart.
Pressure
continuous physical force exerted on or against an object by something in contact with it.
Physical change
occur when objects or substances undergo a change that does not change their chemical composition . They are usually reversible.
Chemical reaction
a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
Word equation
is an expression of a chemical reaction
Reactivity series
of metals is a chart listing metals in order of decreasing reactivity.
Oxidation
Gain of oxygen or loss of electrons
Reduction
is the gain of electrons, loss of oxygen
Sacrificial protection
is a corrosion protection method in which a more reactive metal is attached to a less active metal, preventing it from corroding.
Oxidising agent
Oxidising agents are substances that provide oxygen or accept/ gain electrons
Exothermic reaction
Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases
Endothermic reaction
Endothermic reactions take in energy and the temperature of the surroundings decreases.
Hydrocarbon
a compound of hydrogen and carbon only
Displacement reaction
occurs when a more reactive element displaces, or pushes out, a less reactive element from a compound that contains the less reactive
Thermite reaction
A thermite reaction is a general name for an exothermic (heat-releasing) reaction between iron oxides and aluminium
Native state
occurs in nature uncombined with other elements or pure
Ore
is a rock that contains enough of a metal or a metal compound to make extracting the metal worthwhile
Electrolysis
is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them
How to save iron from rsuting?
By puting on it paints, oil or reactive metals (for example magnesium or zinc)
The main element in the earth’s crust is ___
Oxygen
Most common metal:
ALUMINIUM (8%)
Second most common:
IRON (6%)
Native means
found in its PURE form
Example of native metals:
gold, copper, lead, aluminium, mercury, silver
- Scarce (metal) means
NOT MUCH OF THE ELEMENT = RARE
- The most used metal
iron
Ore of aluminium
Bauxite
Why we using high temperature to delete oxygen from iron?
Because in that situation carbon will connect with oxygen
Solution
Solution is a mixture of a solute dissolved into a solvent
Residue
The solid that doesn’t pass through filter paper during filtration
Filtrate
The liquid that pass through filter paper during filtration. (It is usualy still not very clear)
Insoluble
Substance that does not dissolve in a solvent
Filtration
The process of separating solids from liquids using filter paper
Chromotography
Separating mixtures of soluble substances
Condenser (distilation)
Part of distilation machine that cools down a liquid and making liquid condensate.
Distillation
S``eparation technique used to separate liquid (the solvent) from a mixture and keep the liquid part.
Diffusion
Process by which particles of one substance spread out through the particles of another substance.
Fire triangle
Heat, oxygen and fuel
Combosition
Thermo decomposition
Burning
Decompose of a substance using heat
Solid to gas
Gas to solid
Soblimation
Deposition
