The Grade 11 Agricultural Sciences Note Set is a must-have for any student studying agricultural science. These colorful notes are concise and to the point, making studying a breeze. Whether you're preparing for a test or just looking for a quick review, these notes are the perfect tool. With the G...
, HETEROGENEOUS MIXTURES
MIXTURE [HETEROGENEOUS]:
THE PERIODIC TABLE
→ the composition is not uniform (not the same throughout) Z H (hydrogen) – is a metal and non-metal and is found on both sides of
and the different components of the mixture can be seen the periodic table
→ combination
. of substances that cannot dissolve in each other Z the elements are arranged in order of increasing atomic numbers, with
the lightest element (H, HYDROGEN) in the upper left corner
COLLOIDAL MIXTURE Z position of element tells whether it is a metal or non-metal
(A) metals are found on the left side
MIXTURE [COLLOIDALS]:
→ molecule sizes increase / clumps of molecules (micelles) occur (B) non-metals are found on the far right
→ only with an electron microscope (C) tables have rows and columns
→ does not dissolve in water & forms heterogeneous mixture
Z there are 92 natural elements
[suspension] Z rows from left to right are called PERIODS (there are 7 periods)
Z columns from top to bottom are called GROUPS (there are 18 groups)
ISOTYPE
ISOTYPE:
→ Atoms of the same element with the same atomic number
(number of protons) but with different mass numbers (protons
and neutrons)
→ different versions of an element
→ radioactive [Carbon-14 > isotope of Carbon-12]
, GROUP 1 : ALKALI METALS GROUP 17 : HALOGENS
ALKALI METALS: HALOGEN:
→ Stored in oil or paraffin to prevent contact with oxygen and → Diatomic elements. Consists of molecules with two atoms
water. Chemical reactivity increases from top to bottom in a each. Chemical reactivity decreases from top to bottom in group
group [ionization energy > decrease the valence electron] fluorine, chlorine, bromine, iodine, acetate [radioactive]
lithium, sodium, potassium, rubidium, cerium, francium
F₂ Cl₂ Br₂ I₂
CHARACTERISTICS:
F₂ & Cl₂= yellow-green (room temperature) [TOXIC]
Z Low density (floats on water)
Z Soft > potassium = softest & lithium = hardest Br₂ = reddish brown liquid [TOXIC]
Z Silver coloured & shiny surface I₂ = purple crystals
Z GOOD CONDUCTORS [heat + electricity]
Z Fire in air = solid oxides [alkaline solutions] CHARACTERISTICS:
Z Reacts violently with water > hydrogen gas + alkaline solution of the metal Z Non-metals
hydroxide Z Diatomic molecules
Z Form CATIONS > +1 charge Z ANIONS > -1 charge
Z Low melting points & boiling points > increase as you move down the group
Z Coloured > colour becomes stronger > moves down the group
GROUP 2 : ALKALI - EARTH METALS Z Reactivity> move down the group
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller notedx19. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.25. You're not tied to anything after your purchase.
