The strength of a hydrogen bond is about one-tenth of a normal covalent bond.
What type of bond is one-tenth of that of a normal covalent bond.
100
can be used to separate a magnetic substance from a non-magnetic substance.
What is Magnetic Seperation
100
Queen Elsa sings 'Let it go' on the mountain top
What song does Queen Elsa sing on the mountain top from the hit Disney Movie 'Forzen'?
100
have a variety of different shapes but the angles are always the same, this is because
of the bonding in the individual water molecules
What and Why is a snowflake shaped?
200
can dissolve non-polar substances; again the attraction of the molecules to the solvent must be greater than the intermolecular forces for the substance to dissolve.
What is A non-polar Substance
200
hydrogen bond is a type of intermolecular attraction which occurs when a slightly positively charged hydrogen atom (in a molecule) is attracted to an unshared electron pair in a nearby molecule.
What is Hydrogen Bonding?
200
uses solvents to separate different liquids (usually coloured inks).
Adsorbents attract particles to the surface of a solid.
What is Chromatography
200
Two ions that affect the taste and usefulness of the water are calcium and magnesium. These ions
occur naturally in water sources and contribute to the hardness of the water. Water is described
as „hard‟ when the lather or suds for washing is more difficult to make.
What is Water Hardness?
200
have very strong covalent bonds and do not dissolve in water.
Very large molecules have high intermolecular attractions between the molecules, which is too strong for water to break apart.
What is a Covalent Lattice?
300
Shows as ions or insoluble compounds)
What is a complete ionic equation?
300
The δ (delta) symbol means a small amount charge is present at that end of the molecule.
What is the Delta Symbol
300
is another way of separating immiscible liquids.
What is Centrifuge
300
Electrons orbit around the outside of the atom
What Orbits aournd the outside of the atom
400
Hydrogen is first
What Element is first on the Periodic Table?
400
This gives a ___________________, where the angle between electron pairs is called the tetrahedral angle (approx. 109.5)
Tetrahdral Bonding
400
uses different boiling points separate mixtures of miscible liquids which is often called fractional distillation. It can also be used to separate dissolved solids from a liquid.
What is Distillation
400
The Nucules is in the Centre
What is the centre of an atom called?
400
Valence Shell Electron Repulsion
What is V.S.E.P.R.
500
K
What is the chemical symbol for potassium?
500
The electron attracting power of an atom is called its Electronegativity, this increases from left to right across the periodic table and decreases from top to bottom.
What is Electornegativity?
500
is a process which makes use of the different solubility of solids in water. By lowering the temperature of a saturated solution will cause the substance to crystallise (grow crystals).