Karteikarten
CHEMISTRY 3 FLASHCARDS
Karten in diesem Stapel (30)
- 1What did Dimitri Mandleev do that was different?He arranged all elements in a periodic way. this had meant he had left gaps for undiscovered elements. he then used his table to predict what properties the missing elements properties would be.
- 2what was discovered after mandleev?#Electrons
#Noble gasses
#Atomic Structure
#MODERN TABLE HAS GROUPS AND PERIODS. - 3group one alkali metals?#Low Density
#React with none metals to produce ionic compounds.
#reacting with water releasing hydrogen
#form hydroxides that dissolve in water to produce alkaline solutions.
#The lower you go down in the group~
~they have a lower melting point and boiling point
~they are more reactive - 4what is the diffrence between transition metals and group one alkali metals?~Transition Metals have a much higher boiling and melting point.
- 5what is the range of melting points of group one?30'c-200'c
- 6what are transition metal melting points?1100'c-1900'c
- 7what is diffrence between the hardness of the metal and how strong they are between transition metals and alkali metals?transition metals are much much more harder in comparison to alkali metals.
alkali metals are softer easier to cut through. - 8transition metals much less reactive so they don't react with water and oxygen.
- 9what is transition metals used for ?to make buildings because they will last longer due to there properties.
- 10transition metals also produce ?forms of ions with different charges.
colored compounds.
they are also useful as catalysts - 11what are group seven called ?Halogens
- 12what does the term "aqueous" mean ?it means something dissolved it in water
- 13The higher the energy level of the outer electrons means that ...?The more easily the electrons are lost.
and
The more easily electrons are gained. - 14what produces lather quicker soft water or hard water?soft
- 15what does hard water contain ?it contains dissolved compounds of magnesium and calcium.
this is picked up from the water flow of seas and streams also from the rocks. - 16what two ions make the water to become hard?the magnesium ions and the calcium ions.
- 17scum ??a reaction with soap.
a reaction with water and the calcium ions and the hard water.
causes most soap needed to produce lather. - 18what is a soap less is a washing substance what has manufacturers improved in this ?it doesn't contain sodium stiorate so it doesn't react with calcium ions. so it doesn't wreck up clothes.
- 19what is scale ?reduces the efficency of the appliances in the house.
e.g- kettle/ it coats the heater rod in the scale and makes it harder to heat up the water. - 20benefits of hard waterthe calcium helps with
- Bone development
-Dental development
-Reduce heart disease - 21what is temporary hard water?your capable of making it soft by boiling or heating it to remove the calcium ions
- 22/what is permanent hard water ?remains hard even when we boil it.
- 23how can we soften hard water ?by adding washing soda.
sodium carbonate. - 24how does a ion exchange columnn workhas resins that contain hydrogen or or sodium ions in there.
these are swapped with the calcium or the magnesium - 25why is chlorine added to water?to KILL bacteria
- 26how too create distilled water?heat it up let the water evaporate it is finally passed through tubes and it condenses leaving 100% water.
- 27Flame test- flame color : -lithium -sodium -potassium -calcium -bariumflame test color-:
Li- crimson
Na-yellow
K-lilac
Ca-red
Ba-green - 28if we add sodium hydroxide solutions to a substance containing copper iron (2) iron (3) what are the change in colors ?a blue precipitate
a green percipitate
a brown percipitate - 29how could halide ions be tested? chloride, bromide and iodide1st. we add nitric acid to remove any carbonate ions.
2nd.we add silver nitrate solution if a percipitate is formed there are halide ions are present - 30what colors do these changes too for the halide ion test. chloride bromide iodidechloride- white percipitate
bromide- a cream percipitate
iodide- a yellow percipitate
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- Karteikarten am CHEMISTRY 3 FLASHCARDS, erstellt von Bhavan Matharu am 19/02/2015.
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