IQ1
What is the physical property that is taken advantage of during distillation?
Boiling point
Electron clouds are an indicator of what about electrons?
Probability of location
Which group has the elements with the lowest melting point for each period?
Noble gases
Ionic bonds result in the ______ of electrons.
Transfer. Similar terms accepted.
Which form of radiation releases a helium atom?
Alpha
True or false. One of the uses of gravimetric analysis is to determine if the composition of a product is the same as that of another product.
True
An electron has approximately how many times less mass than a proton.
2000
Ionisation energy is the energy required to__________.
Remove an electron from an atom. Double points - Remove from the gaseous state of an atom.
What is term given to elements with two or more physically distinct forms in the same state?
Allotropy
What are 3 of the possible allotropes of phosphorous.
White, red, black
What is the chemical formula for Carbon tetrafluoride?
CF4
Using the rules of valency, what would be the empirical formula of the ionic compound that forms between magnesium and bromine?
MgBr2
Which 2 groups are composed entirely of non-metals?
17 and 18
Many transition metals have multiple valences. How are these valences differentiated in nomenclature?
Roman numerals (after the metal)
According to VSEPR theory, what are the two electron dense areas in an atom?
Lone pairs and bonds.
What would be the reason for water not having a boiling point of 100OC? (double bonus points for two correct answers)
Impurities (or pressure)
The p orbital starts at which energy level?
2/2nd energy level
Atomic radii ______ in size from left to right in each period.
Decreases
Partial charges occur in ___________ bonds due to unequal sharing of electrons.
Polar covalent
What is the chemical formula for phosphate?
PO43-
If a mixture of ethanol, salt, sand and water were distilled, what order would the individual substances distil over to the receiving flask?
Ethanol > water > (salt > sand). double bonus points - salt and sand would not distil over.
Which rule states that at least one electron must be present in each sublevel before pairing up?
Hund's rule
There are 3 reasons for the trends in atomic radii. Proton number, energy level, and __________.
the screening effect
Hydrogen bonding only occurs between a hydrogen attached to nitrogen, oxygen or fluorine on one atom and ______________ on another atom.
Nitrogen, oxygen or fluorine.
Two solutions were prepared to demonstrate how substances could cause an increase and decrease in waters boiling point. What are the requirements of the two solutes to be added? (Multiple possible answers, potential for TRIPLE points for a fully correct answer)
There must be one more volatile and one less volatile than water (and both must be soluble).