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WorksheetsPHC413: CONCLUSION OF WEEK 1
Total questions: 10
Worksheet time: 4mins
Crystal is a
pure material that can’t be changed.
material with a regular,repeating arrangement of atoms.
a foggy like material.
What type of crystal structure does iron have?
ionic crystal
metallic crystal
giant molecular crystal
simple molecular crystal
Diamond is extremely hard due to its
weak covalent bonds
ionic bonds
strong covalent bonds
indestructible property
Metallic crystals are good conductors of electricity.
True
False
An amorphous solid has a definite melting point.
True
False
A regular repeating 3-dimensional structure is called
a crystal
a base unit or unit cell
crystallisation
a crystal lattice
Amorphous means
shape
without shape
repeating
non repeating
change
_____________ have well defined melting points.
Crystals
Amorphous solids
Organic solutions
A window glass is transparent because
it has a single crystal structure and each sheet is cut with the optic axis normal to the plane of the window.
it has an amorphous structure with large interatomic spacing. Light waves can pass between widely spaced atoms without any interaction with the solid structure.
the glass sheets are cut thin enough for light to pass through without any significant absorption.
of the electronic nature of the bonds between the atoms in the glass.
Which is not classified as crystalline solids?
Rock salts
Calcites
Quartz solids
Sand
