Structure And Bonding Flashcards
Which atoms usually gains electrons to form negative ions?
Non-metal atoms
What formula belongs to a ion?
Na+
Metal atoms form:
Positive ions by losing electrons
In ionic bonding:
Oppositely charged ions attract
Sodium chloride conducts electricity when:
molten or in solution
Structure of magnesium oxide is a:
Giant ionic lattice
Why does sodium chloride have a low melting point the magnesium chloride?
Because the positive ions are larger but have small charge
Explain the conductivity of sodium chloride:
It conducts electricity when molten because it’s ions are free to move
How many electrons are involved in each convelent bond?
Two
Which sort of elements form covalent bonds?
Non metals
What has molecules of two atoms joined by a covalent bond?
Chlorine
What does covalent bond involved?
Sharing electrons between atoms
Name one molecule compound?
hydrogen chloride
Where do electrons in a covalent bond come from?
The highest occupied energy level
Nitrogen is in group 5 of the periodic table. how many covalent bonds can it form?
Three
Name a element which normally forms four covalent bonds
Carbon
What kind of structure do diamond and graphite have?
Giant molecular structures
Why might fullerenes be used in new drug delivery systems?
Because they are hollow
In what physical state or states do Ionic substances conduct electricity?
Liquid state or dissolved in water
How does the structure of nano tubes make them suitable Catalysts?
Large surface area
What type of bonding is present in metals?
Metallic bonding
Metals have high melting points because:
They have strong bonds
Polymers with cross links are:
Thermosetting polymers
What is copper used to make electrical wiring?
Because it’s a good conductor of electricity
Can you name the approximate size of a typical nano particle?
Approximately 50nm
What is a nano particle?
Particle of nano scale
metals conduct electricity because?
They contain electrons which are free to move
When a substance of a similar molecule structure boils,which bonds are broken?
Intermolecular bonds
